Vacuum sealing machine

Abstract

The vacuum sealing machine comprises a shell, the shell is provided with an insertion opening, a pressing piece is arranged at the insertion opening, the pressing piece comprises a first pressing part and a second pressing part, an air cylinder is further arranged in the shell, and the air cylinder comprises an air chamber capable of forming negative pressure and a driving part driven by the negative pressure. The driving part drives the first pressing part to move towards the second pressing part so as to form a sealing cavity, the sealing machine is provided with a first channel communicated with the air chamber and a second channel communicated with the sealing cavity, the first channel is provided with a control valve, and the control valve is used for controlling the air chamber under negative pressure to release pressure through the first channel so that the sealing cavity under negative pressure can release pressure through the second channel. The first channel and the second channel are associated, and after the first channel communicates with the external atmosphere, the second channel also communicates with the external atmosphere. Therefore, during pressure relief, the use of one control valve is reduced, the internal structure of the shell is simplified, the control program of the sealing machine is simplified, the control logic is simpler, and the cost is saved.

Description

Technical Field

[0001] The present application belongs to the technical field of sealing equipment, and in particular relates to a vacuum sealing machine. Background Art

[0002] Vacuum sealers are generally divided into manual and automatic types. Manual sealers include a base and a cover. The cover is rotatably connected to the base. When in use, the user needs to manually press the cover to press the seal on the cover with the seal on the base to form a sealed cavity, and then start the vacuum pump to extract the gas in the sealed cavity and the food bag, and then the heating component heats the food bag mouth to seal it. The automatic sealer includes a shell with a socket. When in use, you only need to insert the food bag into the socket without manual pressing. The first pressing part and the second pressing part can automatically complete the pressing and form a sealed cavity, and the vacuum pump further sucks the gas in the sealed cavity.

[0003] For the automatic vacuum sealing machine, a downward pressing mechanism is also provided inside its shell. The vacuum pump is connected to the downward pressing mechanism through a pipeline. The downward pressing mechanism is usually a cylinder structure. The vacuum pump sucks the gas in the cylinder, so that the cylinder piston moves to form a thrust on the upper seal, thereby pushing the upper seal and the lower seal to be pressed together to form a sealed cavity. At the same time, the vacuum pipeline of the sealed cavity is also provided with a vacuum pump to suck the gas in the sealed cavity when the upper seal and the lower seal are pressed together to form a vacuum environment.

[0004] In addition, two solenoid valves are provided in the shell, one of which is provided on a pipeline connected to the cylinder, and the other is provided on a pipeline connected to the sealing chamber. The pressure relief pipeline of the cylinder and the pressure relief pipeline of the sealing chamber are two independent pipelines, which are not related to each other and are pressure relieved separately. Although the above structure can meet the normal operation of the automatic vacuum sealer, after the sealing is completed, it is necessary to control the two solenoid valves to work separately so that the cylinder and the sealing chamber are connected to the outside atmosphere for pressure relief. This not only leads to a complex internal structure of the sealing machine, a large number of parts, and occupies more space inside the shell, affecting the internal layout of the shell and making assembly more difficult, but also makes the control program and control logic of the whole machine more complicated, resulting in increased costs. Summary of the invention

[0005] The present application provides a vacuum sealer to solve the problem that during the pressure relief process of an automatic vacuum sealer, electromagnetic valves need to be provided to control the pressure relief of a pressing mechanism and a sealing chamber, respectively, which not only causes a complex structure but also leads to high costs.

[0006] The technical solution adopted in this application is:

[0007] A vacuum sealer comprises a shell, the shell is provided with an insertion port for inserting a packaging bag, a pressing piece is provided at the insertion port, the pressing piece comprises a first pressing part and a second pressing part, a cylinder is also provided in the shell, the cylinder comprises an air chamber that can form a negative pressure and a driving part driven by the negative pressure, the driving part drives the first pressing part to move toward the second pressing part to form a sealed cavity, the sealer has a first channel connected to the air chamber, and a second channel connected to the sealed cavity, the first channel is provided with a control valve, the control valve is used to control the air chamber under negative pressure to release pressure through the first channel; the air chamber is depressurized so that the sealed cavity under negative pressure is depressurized through the second channel.

[0008] The vacuum sealer of the present application also includes the following additional technical features:

[0009] The second channel includes a pressure relief port opened on the compression piece, and one side of the pressure relief port is connected to the sealed cavity; the cylinder also includes an abutment portion, and the abutment portion has an abutment position abutting against the pressure relief port and a separation position away from the pressure relief port under the control of the driving portion; the control valve controls the pressure relief of the air chamber so that the abutment portion is in the separation position, and a pressure relief gap is formed between the abutment portion and the compression piece, and the other side of the pressure relief port is connected to the outside atmosphere through the pressure relief gap, and the outside atmosphere enters the sealed cavity through the pressure relief gap and the pressure relief port.

[0010] The abutting portion is at the abutting position, and the first channel, the air chamber, the pressure relief port and the sealing cavity are connected in sequence.

[0011] The abutting portion is at the abutting position, and the abutting portion blocks the pressure relief port.

[0012] The first channel, the air chamber, the second channel and the sealed cavity are connected in sequence; the control valve controls the pressure relief of the air chamber to allow the outside atmosphere to enter the sealed cavity through the first channel, the air chamber and the second channel.

[0013] The flow rate of the second channel is smaller than the flow rate of the first channel.

[0014] The second channel is provided with a one-way valve, and the one-way valve has a conducting position and a shutoff position. The one-way valve connects the sealed cavity and the air chamber in the conducting position, and disconnects the sealed cavity and the air chamber in the shutoff position; or, the second channel is provided with a stop valve and a trigger part, and the driving part has a first position under normal pressure and a second position under negative pressure. In the first position, the trigger part is separated from the stop valve, and in the second position, the trigger part cooperates with the stop valve; in the first position, when the air chamber is under negative pressure relative to the sealed cavity, the stop valve cuts off the connection between the second channel and the air chamber, and when the air chamber is under positive pressure relative to the sealed cavity, the stop valve connects the second channel with the air chamber; in the second position, the trigger part pushes the stop valve to connect the second channel with the air chamber to evacuate the sealed cavity.

[0015] The vacuum sealer comprises an exhaust member, which is connected to the air chamber through the first channel, and the air chamber and the sealing cavity are evacuated through the exhaust member.

[0016] The vacuum sealer comprises a first suction member and a second suction member, wherein the first suction member is connected to the air chamber, and the second suction member is connected to the sealing cavity, and the first suction member and the second suction member vacuumize the air chamber and the sealing cavity respectively.

[0017] The driving portion cooperates with the first pressing portion so that the first pressing portion and the driving portion move synchronously.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0019] 1. In the present application, the driving part of the cylinder can move under the change of air pressure in the air chamber. When negative pressure is formed in the air chamber, the driving part moves and drives the first pressing part to move toward the second pressing part so that the sealing gaskets of the two are abutted to form the sealing cavity. The sealing machine of the present application has a first channel connected to the air chamber and a second channel connected to the sealing cavity. After the sealing is completed, the air chamber can be depressurized through the first channel, and the sealing cavity can be depressurized through the second channel. The second channel can automatically complete the conduction when the first channel is turned on, so that the present application does not need to set a control valve on the pressure relief channels of the air chamber and the sealing cavity respectively, and only needs to set the control valve on the first channel.

[0020] The present application associates a first channel for decompression of the air chamber and a second channel for decompression of the sealed cavity. After the first channel is connected to the outside atmosphere, the second channel is also connected to the outside atmosphere. In this way, when decompressing, it is only necessary to control the control valve on the first channel to open so that the first channel is connected to the outside atmosphere, and the air chamber is decompressed at this time. In this process, the second channel is also connected to the outside atmosphere, so that outside air can also enter the sealed cavity for decompression. Compared with the prior art, the vacuum sealer of the present application can reduce the use of a control valve on the basis of meeting the pressure relief requirements of the air chamber and the sealed cavity, simplify the structure inside the shell, optimize the layout of components, reduce the difficulty of assembly, and simplify the control program of the vacuum sealer, making the control logic simpler, reducing the failure rate, and saving costs.

[0021] 2. As a preferred embodiment of the present application, the second channel includes a pressure relief port opened on the compression piece, and one side of the pressure relief port is connected to the sealed cavity; the cylinder also includes an abutment portion, and the abutment portion has an abutment position abutting against the pressure relief port and a separation position away from the pressure relief port under the control of the driving portion; the control valve controls the pressure relief of the air chamber so that the abutment portion is in the separation position, and a pressure relief gap is formed between the abutment portion and the compression piece, and the other side of the pressure relief port is connected to the outside atmosphere through the pressure relief gap, and the outside atmosphere enters the sealed cavity through the pressure relief gap and the pressure relief port. The abutment part can move under the control of the driving part to abut against or separate from the pressure relief port. When the control valve controls the first channel to be connected with the outside atmosphere, the outside gas enters the air chamber through the first channel, and the air pressure in the air chamber rises, prompting the driving part to control the movement of the abutment part, and the abutment part gradually moves to the separation position. At this time, the pressure relief port is connected with the outside atmosphere through the pressure relief gap, which also realizes the direct connection between the second channel and the outside atmosphere. The outside air can enter the sealed cavity through the pressure relief gap and the pressure relief port to realize the pressure relief of the sealed cavity. The abutment part is driven by the driving part to move, so that it is separated from the first pressing part, and the pressure relief port is directly connected with the outside atmosphere, so that the outside air can directly enter the sealed cavity through the pressure relief port, shortening the length of the second channel, greatly accelerating the speed of the outside air entering the sealed cavity, and realizing the rapid pressure relief of the sealed cavity.

[0022] 3. As a preferred embodiment of the present application, the first channel, the air chamber, the second channel and the sealed cavity are connected in sequence; the control valve controls the pressure relief of the air chamber, so that the outside atmosphere enters the sealed cavity through the first channel, the air chamber and the second channel. In this embodiment, the second channel is connected to the outside atmosphere through the first channel. When the control valve connects the first channel to the outside atmosphere, the first channel and the second channel are connected to the outside atmosphere at the same time. The outside air enters the first channel and further enters the sealed cavity through the second channel, so that the air chamber and the sealed cavity are depressurized. In addition, in this embodiment, the sealed cavity can be depressurized in two ways. When the control valve connects the first channel to the outside atmosphere, the air chamber will be depressurized first, and because the second channel is connected to the first channel, the sealed cavity will also be depressurized slowly. With the depressurization of the air chamber, the abutment part is separated from the first pressing part, and the pressure relief port is opened, so that the pressure relief port is directly connected to the outside atmosphere. At this time, the sealed cavity is depressurized quickly. In this way, the pressure relief speed of the sealing cavity is controlled so that the pressure is relieved in a slow manner first and then fast manner, ensuring the orderly pressure relief in the air chamber and the sealing cavity. The driving part and the first pressing part move in a sequential order, so that the first pressing part can automatically complete the movement and reset under the push of air pressure, and can appropriately reduce the force acting on the first pressing part by other pulling structures, so as to simplify the structure and increase the service life of the first pressing part.

[0023] 4. As a preferred embodiment of the present application, the flow rate of the second channel is less than the flow rate of the first channel. Since the second channel is connected to the first channel, the control valve can control the first channel and the second channel to be connected to the outside atmosphere at the same time. By designing the flow difference between the first channel and the second channel, the flow rate of the second channel is less than the flow rate of the first channel, so that during the pressure relief process of the air chamber and the sealed cavity, the air volume and flow rate of the outside air entering the air chamber through the first channel are faster, so the pressure relief speed of the air chamber is also faster, while the pressure relief speed of the sealed cavity is slower, so that the air chamber will complete the pressure relief before the compression piece. During the pressure relief process, the second channel can be connected to the air chamber and the first channel, and the outside air enters the sealed cavity through the first channel, the air chamber and the second channel in turn to complete the pressure relief. It is also possible to make the cylinder used to block the second channel move relative to the compression piece, so that the second channel is directly connected to the outside atmosphere, and the outside air directly enters the sealed cavity through the pressure relief gap and the pressure relief port to relieve pressure. The second channel can also be connected to the air chamber and the first channel at the initial stage of pressure relief to perform pressure relief. As the pressure relief of the air chamber proceeds, the part where the cylinder abuts against the compression piece gradually separates from the compression piece. At this time, the second channel is directly connected to the outside atmosphere to perform rapid pressure relief.

[0024] 5. As a preferred embodiment of the present application, the vacuum sealer includes a vacuum element, which is connected to the air chamber through the first channel, and the air chamber and the sealing cavity are evacuated through the vacuum element. Compared with the prior art method of separately providing two vacuum elements to evacuate the cylinder air chamber and the sealing cavity, the present embodiment reduces the use of one vacuum element, and only uses one vacuum element to communicate with the first channel, and the first channel is connected with the second channel. Therefore, when the vacuum element is evacuating air, the air in the air chamber and the sealing cavity will be evacuated by the vacuum element. This further simplifies the internal structure of the sealer, simplifies the complexity of the control program, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 This is a schematic structural diagram of the vacuum sealer according to one embodiment of the present application;

[0027] Figure 2 for Figure 1 An exploded view of the structure of the vacuum sealer described in;

[0028] Figure 3 for Figure 1 A schematic diagram of the structure of a part of the vacuum sealer described in the embodiment;

[0029] Figure 4 is a cross-sectional view of the vacuum sealer in one embodiment of the present application, wherein the abutting portion is in an abutting position, and the sealing cavity is not formed between the first pressing portion and the second pressing portion;

[0030] Figure 5 for Figure 4 A cross-sectional view of a portion of the vacuum sealer described in;

[0031] Figure 6 for Figure 5 A cross-sectional view of a partial area of ​​the vacuum sealer in a state where the first pressing part and the second pressing part are pressed together;

[0032] Figure 7 for Figure 6 A cross-sectional view of a partial area of ​​the vacuum sealer when the abutment portion is in a separated position;

[0033] Figure 8 is a cross-sectional view of the vacuum sealer in another embodiment of the present application, wherein the abutting portion is in the abutting position, and the first pressing portion and the second pressing portion are pressed together to form the sealing cavity;

[0034] Fig. 9 for Figure 8 A cross-sectional view of a partial area of ​​the vacuum sealer when the abutment portion is in a separated position;

[0035] Fig.10 is a cross-sectional view of the cylinder and the pressing piece in one embodiment of the present application, wherein the on-off valve is in a state of blocking the second channel;

[0036] Fig.11 A cross-sectional view of the cylinder and the pressing part in another embodiment of the present application;

[0037] Fig.12 A cross-sectional view of the cylinder and the pressing part in yet another embodiment of the application.

[0038] in:

[0039] 1 housing; 11 insertion port; 12 first pipeline; 13 second pipeline; 14 control circuit board; 15 micro switch; 16 heating element;

[0040] 2 pressing part; 21 first pressing part; 22 second pressing part; 221 air extraction port; 23 sealing pad;

[0041] 3 cylinder; 31 air chamber; 32 driving part; 321 sealing section; 322 action section; 33 abutting part; 34 elastic reset member;

[0042] 4 Sealed chamber;

[0043] 5 first channel; 51 air inlet;

[0044] 6 second channel; 61 pressure relief port; 62 pressure relief gap; 63 air flow channel; 64 on / off valve; 65 triggering part;

[0045] 7 first suction member;

[0046] 8 second air extraction member;

[0047] 9Control valve. DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0050] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "implementation method", "example", "one embodiment", "example" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0053] like Figures 1 to 12 As shown, a vacuum sealing machine comprises a shell 1, wherein the shell 1 is provided with an insertion port 11 for inserting a packaging bag, a pressing piece 2 is provided at the insertion port 11, and the pressing piece 2 comprises a first pressing part 21 and a second pressing part 22. A cylinder 3 is also provided in the shell 1, and the cylinder 3 comprises an air chamber 31 which can form a negative pressure and a driving part 32 driven by the negative pressure, and the driving part 32 drives the first pressing part 21 to move toward the second pressing part 22 to form a sealing cavity 4. The sealing machine has a first channel 5 connected to the air chamber 31, and a second channel 6 connected to the sealing cavity 4. The first channel 5 is provided with a control valve 9, and the control valve 9 is used to control the pressure relief of the air chamber 31 under negative pressure through the first channel 5; the pressure relief of the air chamber 31 causes the pressure relief of the sealing cavity 4 under negative pressure through the second channel 6.

[0054] It should be noted that the "pressure relief" in this application refers to the process in which the air chamber 31 and the sealed cavity 4 rise from a negative pressure or vacuum environment to a normal pressure environment. During the pressure relief process, the outside air enters the air chamber 31 through the first channel 5 and enters the sealed cavity 4 through the second channel 6. In addition, in this document, except for clear instructions (for example, the air chamber 31 is at a positive pressure relative to the sealed cavity 4, and the air chamber 31 is at a negative pressure relative to the sealed cavity 4), other descriptions of positive and negative pressures are all relative to the external atmospheric pressure. For example, the "sealed cavity under negative pressure" mentioned above means that the pressure difference of the sealed cavity 4 relative to the atmospheric pressure is negative.

[0055] The control valve 9 may be a solenoid valve to facilitate association with the control program of the vacuum sealer, and to electrically control its conduction or blocking. The control valve 9 may also be a manually controlled structure, which is not limited here.

[0056] In the present application, the driving part of the cylinder 3 can move under the change of air pressure in the air chamber 31. When negative pressure is formed in the air chamber 31, the driving part 32 moves and drives the first pressing part 21 to move toward the second pressing part 22 so that the sealing gaskets of the two are abutted to form the sealing cavity 4. The sealing machine of the present application has a first channel 5 connected to the air chamber 31 and a second channel 6 connected to the sealing cavity 4. After the sealing is completed, the air chamber 31 can be depressurized through the first channel 5, and the sealing cavity 4 can be depressurized through the second channel 6. The second channel 6 can automatically complete the conduction when the first channel 5 is turned on, so that the present application does not need to set a control valve on the pressure relief channel of the air chamber 31 and the sealing cavity 4 respectively, and only needs to set a control valve 9 on the first channel 5.

[0057] The present application associates the first channel 5 for depressurizing the air chamber 31 and the second channel 6 for depressurizing the sealed chamber 4. After the first channel 5 is connected to the outside atmosphere, the second channel 6 is also connected to the outside atmosphere. In this way, when depressurizing, it is only necessary to control the control valve 9 on the first channel 5 to open so that the first channel 5 is connected to the outside atmosphere, and the air chamber 31 is depressurized at this time. In this process, the second channel 6 is also connected to the outside atmosphere, so that the outside air can also enter the sealed chamber 4 for depressurization. Compared with the prior art, the vacuum sealer of the present application can reduce the use of a control valve on the basis of meeting the pressure relief requirements of the air chamber 31 and the sealed chamber 4, simplify the structure inside the shell 1, optimize the layout of components, reduce the difficulty of assembly, and simplify the control program of the vacuum sealer, make the control logic simpler, reduce the failure rate, and save costs.

[0058] It can be understood that the first pressing part 21 and the second pressing part 22 are both provided with a sealing gasket 23, one of which is located on the upper side of the insertion port 11, and the other is located on the lower side of the insertion port 11, and the second pressing part 22 is fixed to the shell 1, and the first pressing part 21 can move up and down. When the user inserts the food bag to be sealed into the insertion port 11, the driving part 32 of the cylinder 3 will move under the negative pressure of the air chamber 31, and then the driving part 32 drives the first pressing part 21 to move toward the second pressing part 22, so that the sealing gasket 23 of the first pressing part 21 and the sealing gasket 23 of the second pressing part 22 are abutted and pressed, and the two cooperate to form the sealing cavity 4. Figure 2 As shown, the vacuum sealer further comprises a heating element 16. After the food bag is evacuated, the heating element 16 starts heating to melt the bag opening of the food bag to complete the sealing.

[0059] For example, the first pressing part 21 is located at the upper side of the insertion port 11, and the second pressing part 22 is located at the lower side of the insertion port 11. The first pressing part 21 moves downward so that its sealing gasket 23 abuts against the sealing gasket 23 of the second pressing part 22 to form the sealing cavity 4, and moves upward so that its sealing gasket 23 is separated from the sealing gasket 23 of the second pressing part 22. Of course, the first pressing part 21 can also be located at the lower side of the insertion port 11, and correspondingly, the second pressing part 22 is located at the upper side of the insertion port 11, so that the first pressing part 21 moves upward so that its sealing gasket 23 abuts against the sealing gasket 23 of the second pressing part 22 to form the sealing cavity 4, and moves downward so that its sealing gasket 23 is separated from the sealing gasket 23 of the second pressing part 22.

[0060] The sealing pad 23 can be sealing cotton, sealing silica gel, etc., which is not limited here.

[0061] The present application does not limit the driving method of the driving part 32 on the first pressing part 21. In one embodiment, Figures 4 to 9 , Figure 11 to Figure 12 As shown, the driving portion 32 and the first pressing portion 21 are located on the same side of the second pressing portion 22, so that the driving portion 32 pushes the first pressing portion 21 to move toward the second pressing portion 22. In another embodiment, Fig.10 As shown, the driving portion 32 and the first pressing portion 21 are respectively located on both sides of the second pressing portion 22 , so that the driving portion 32 moves toward the second pressing portion 22 by pulling the first pressing portion 21 .

[0062] like Figure 5 As shown, the driving part 32 has a sealing section 321 located inside the cylinder 3, and an action section 322 extending outside the cylinder 3 to act on the first pressing part 21. The sealing section 321 is in sealing contact with the inner wall of the cylinder 3, dividing the inside of the cylinder 3 into two cavities. When the air pressure in one cavity is lower than the air pressure in the other cavity, the driving part 32 will move under the action of the air pressure difference, causing the action section 322 to extend or retract, thereby forming a driving force for the first pressing part 21. An elastic reset member 34 is also provided in the air chamber 31. When the air chamber 31 is in a negative pressure environment, the elastic reset member 34 is compressed. During the pressure relief process of the air chamber 31, the elastic reset member 34 pushes the sealing section 322 to move, so as to assist the movement of the driving part 32.

[0063] It should be noted that the present application does not limit the communication mode between the second channel 6 and the outside atmosphere, which may be one of the following embodiments:

[0064] Embodiment 1: In this embodiment, the second channel 6 can be directly connected to the outside atmosphere. Figures 4 to 9 As shown, the second channel 6 includes a pressure relief port 61 opened on the pressing part 2, and one side of the pressure relief port 61 is connected to the sealed chamber 4; the cylinder 3 also includes an abutment portion 33, and the abutment portion 33 has an abutment position abutting against the pressure relief port 61 and a separation position away from the pressure relief port 61 under the control of the driving part 32; the control valve 9 controls the pressure relief of the air chamber 31 to make the abutment portion 33 in the separation position, and a pressure relief gap 62 is formed between the abutment portion 33 and the pressing part 2, and the other side of the pressure relief port 61 is connected to the outside atmosphere through the pressure relief gap 62, and the outside atmosphere enters the sealed chamber 4 through the pressure relief gap 62 and the pressure relief port 61.

[0065] The abutting portion 33 can move under the control of the driving portion 32 to abut against or separate from the pressure relief port 61. When the control valve 9 controls the first channel 5 to communicate with the outside atmosphere, the outside gas enters the air chamber 31 through the first channel 5, and the air pressure in the air chamber 31 rises, prompting the driving portion 32 to control the abutting portion 33 to move, and the abutting portion 33 gradually moves to the separation position. Figure 7 , Fig. 9 As shown, at this time, the pressure relief port 61 is connected to the outside atmosphere through the pressure relief gap 62, which realizes the direct connection between the second channel 6 and the outside atmosphere, and the outside air can enter the sealed cavity 4 through the pressure relief gap 62 and the pressure relief port 61, so as to realize the pressure relief of the sealed cavity 4. The driving part 32 drives the abutting part 33 to move, so that it is separated from the first pressing part 21, and the pressure relief port 61 is directly connected to the outside atmosphere, so that the outside air can directly enter the sealed cavity 4 through the pressure relief port 61, shortening the length of the second channel 6, greatly accelerating the speed at which the outside air enters the sealed cavity 4, and realizing the rapid pressure relief of the sealed cavity 4.

[0066] The present application does not limit the location of the pressure relief port 61. Figures 5 to 10 As shown, the pressure relief port 61 can be provided at the first pressing portion 21. Since the first pressing portion 21 can move up and down, when the driving portion 32 drives the first pressing portion 21, the abutting portion 33 can abut against the pressure relief port 61 under the action of the driving force. Figures 5 to 9 As shown, the abutment portion 33 is disposed on the driving portion 32 and can move synchronously with the driving portion 32. Further, the abutment portion 33 protrudes from the driving portion 32, so that the driving portion 32 drives the pressing member 2 to move through the abutment portion 33.

[0067] like Figure 11 to Figure 12 As shown, the pressure relief port 61 can also be provided at the second pressing part 22. Since the position of the second pressing part 22 is fixed, the influence of position change on the abutment effect between the pressure relief port 61 and the abutment part 33 can be reduced. In one embodiment, the abutment part 33 and the driving part 32 are independent structures. The driving part 32 is used to drive the pressing part 2 to move, and the abutment part 33 is used to abut against the pressure relief port 61.

[0068] Preferably, Figure 5 As shown, the pressing part 2 is provided with an avoidance recess at the pressure relief port 61, so that the abutment portion 33 can enter the avoidance recess and abut against the pressing part 2, making the contact between the two more stable, ensuring that the abutment portion 33 abuts against the preset position of the pressing part 2, and preventing the abutment portion 33 from slipping relative to the pressing part 2.

[0069] As a preferred embodiment of this implementation, Figure 8 , Fig. 9 As shown, the abutting portion 33 is at the abutting position, and the first channel 5, the air chamber 31, the pressure relief port 61 and the sealing cavity 4 are connected in sequence.

[0070] In this embodiment, Figure 8 , Fig. 9 As shown, when the abutment portion 33 abuts against the pressure relief port 61, the pressure relief port 61 is not blocked by the abutment portion 33, but is connected with the air chamber 31 and the first channel 5, so that after the control valve 9 controls the first channel 5 to be connected with the outside atmosphere, the outside air can not only enter the air chamber 31 through the first channel 5, causing the air chamber 31 to start to relieve pressure, but also some gas enters the sealed cavity 4 through the pressure relief port 61, causing the sealed cavity 4 to relieve pressure.

[0071] In this embodiment, since the path of the outside air entering the air chamber 31 is short, and the path of entering the sealed cavity 4 is long, or by reducing the flow rate of the second channel 6 to be less than the flow rate of the first channel 5, the pressure relief speed of the air chamber 31 is faster than the pressure relief speed of the sealed cavity 4. That is to say, during the pressure relief process, the abutment portion 33 will move before the pressing member 2, or the movement speed will be greater than the speed of the pressing member 2. Fig. 9As shown, the pressure relief gap 62 is formed between the abutment portion 33 and the pressing part 2, and the pressure relief port 61 is directly connected to the outside atmosphere to continue to relieve pressure. In this embodiment, after the control valve 9 connects the first channel 5 to the outside atmosphere, the air chamber 31 is relieved through the first channel 5, and the sealed cavity 4 is connected to the air chamber 31 and the first channel 5 through the pressure relief port 61 for pressure relief. As the pressure relief proceeds, the abutment portion 33 is separated from the pressing part 2, and the pressure relief port 61 is directly connected to the outside atmosphere for pressure relief. In this way, the pressure relief speed of the sealed cavity 4 is controlled, so that the pressure relief is carried out in a slow-first-faster-faster manner, ensuring that the pressure relief in the air chamber 31 and the sealed cavity 4 is carried out in an orderly manner, and the driving portion 32 and the first pressing part 21 move in a sequential order, so that the first pressing part 21 can automatically complete the movement reset under the push of air pressure, and can appropriately reduce the force of other pulling structures acting on the first pressing part 21, so as to simplify the structure and increase the service life of the first pressing part 21.

[0072] In addition, in the process of using a single vacuum component to evacuate air, the vacuum component is connected to the first channel 5 to extract the gas in the air chamber 31 and the sealed cavity 4. Since the length of the second channel 6 is greater than the first channel 5, the vacuum speed in the air chamber 31 is faster, and the sealed cavity 4 is not formed at this time, so that the driving part 32 will first move with the first pressing part 21, and then push the first pressing part 21 toward the second pressing part 22 through the abutting part 33. Finally, the sealing gaskets 23 of the two abut against each other to form the sealed cavity 4, and then the vacuum component continues to evacuate air to suck the gas in the sealed cavity 4.

[0073] At the same time, when the abutting portion 33 is at the abutting position, the air chamber 31 and the sealing cavity 4 are connected, and a vacuum pump can be used to evacuate the air chamber 31 and the sealing cavity 4 without separately setting vacuum pumps, thereby saving costs.

[0074] Specifically, Figure 8 , Fig. 9 As shown, an air flow channel 63 connected to the air chamber 31 is provided inside the abutting portion 33 . When the abutting portion 33 abuts against the pressure relief port 61 , the air flow channel 63 is connected to the pressure relief port 61 , so that the pressure relief port 61 is connected to the air chamber 31 .

[0075] As another preferred embodiment of this embodiment, Figures 4 to 7 As shown, the abutting portion 33 is at the abutting position, and the abutting portion 33 blocks the pressure relief port 61 .

[0076] In this embodiment, Figure 6As shown, when the abutting portion 33 abuts against the pressure relief port 61, the pressure relief port 61 is blocked by the abutting portion 33. After the control valve 9 controls the first channel 5 to communicate with the outside atmosphere, the outside air enters the air chamber 31. As the air pressure in the air chamber 31 increases, the driving portion 32 drives the abutting portion 33 to move, so that the abutting portion 33 and the pressing piece 2 move relative to each other, and then separate from the pressing piece 2, forming the pressure relief gap 62 between the two. Figure 7 As shown, the pressure relief port 61 is directly connected to the outside atmosphere. In this embodiment, after the control valve 9 connects the first channel 5 to the outside atmosphere, the air chamber 31 will first release pressure. At this time, since the abutment portion 33 blocks the pressure relief port 61, the sealed cavity 4 has not yet started to release pressure. After the abutment portion 33 is separated from the compression piece 2, the pressure relief port 61 is connected to the outside atmosphere, and the sealed cavity 4 starts to release pressure.

[0077] In this embodiment, two vacuum components may be provided to communicate with the air chamber 31 and the sealed cavity 4 respectively, so as to vacuum the air chamber 31 and the sealed cavity 4 respectively.

[0078] Embodiment 2: In this embodiment, the second channel 6 is connected to the air chamber 31 and the first channel 5, so as to release pressure through the first channel 5. Specifically, Figures 8 to 12 As shown, the first channel 5, the air chamber 31, the second channel 6 and the sealed cavity 4 are connected in sequence; the control valve 9 controls the pressure relief of the air chamber 31 to allow the outside atmosphere to enter the sealed cavity 4 through the first channel 5, the air chamber 31 and the second channel 6.

[0079] When the control valve 9 connects the first channel 5 with the outside atmosphere, the first channel 5 and the second channel 6 are connected with the outside atmosphere at the same time, and the outside air enters the first channel 5 and further enters the sealed cavity 4 through the second channel 6, so that the air chamber 31 and the sealed cavity 4 are depressurized.

[0080] This embodiment does not limit the communication mode between the air chamber 31 and the second channel 6. In one embodiment, Fig.10 As shown, the second channel 6 includes a pressure relief port 61 opened in the pressing member 2, the driving part 32 abuts against the pressure relief port 61, and an air flow channel 63 is provided inside the driving part 32 for connecting the pressure relief port 61 and the air chamber 31, or, as shown in FIG. Figure 8 , Fig. 9As shown, the cylinder 3 further includes an abutting portion 33, the abutting portion 33 abuts against the pressure relief port 61, and an air flow channel 63 is provided inside the abutting portion 33, and the pressure relief port 61 is connected to the air chamber 31 through the air flow channel 63. Of course, the second channel 6 can also be connected to the air chamber 31 in other ways, such as Figure 11 to Figure 12 As shown, the pressure relief port 61 is directly connected to the air chamber 31 through a pipeline, etc., which is not specifically limited here.

[0081] Preferably, the flow rate of the second channel 6 is smaller than the flow rate of the first channel 5 .

[0082] Since the second channel 6 is connected to the first channel 5, the control valve 9 can control the first channel 5 and the second channel 6 to be connected to the outside atmosphere at the same time. By designing the flow difference between the first channel 5 and the second channel 6, the flow of the second channel 6 is made smaller than the flow of the first channel 5, so that during the pressure relief process of the air chamber 31 and the sealed cavity 4, the air volume and flow rate of the outside air entering the air chamber 31 through the first channel 5 are faster, so the pressure relief speed of the air chamber 31 is also faster, while the pressure relief speed of the sealed cavity 4 is slower, so that the air chamber 31 will complete the pressure relief before the press-fit part 2.

[0083] During the pressure relief process, the second channel 6 can be connected to the air chamber 31 and the first channel 5. Fig.10 As shown, the outside air enters the sealed cavity 4 through the first channel 5, the air chamber 31 and the second channel 6 in sequence to complete the pressure relief. It is also possible to make the component of the cylinder 3 used to block the second channel 6 move relative to the pressing part 2, so that a pressure relief gap 62 is formed between the component and the pressing part, and the second channel 6 is directly connected to the outside atmosphere through the pressure relief gap 62, and the outside air directly enters the sealed cavity 4 through the pressure relief gap 62 and the pressure relief port 61 to relieve the pressure. Of course, it is also possible as described in the above embodiment, Figure 8 As shown, the second channel 6 is connected with the air chamber 31 and the first channel 5 at the initial stage of pressure relief to relieve pressure. As the pressure relief of the air chamber 31 proceeds, the part where the cylinder 3 abuts against the pressing part 2 gradually separates from the pressing part 2. Fig. 9 As shown, at this time, the second channel 6 is directly connected to the outside atmosphere through the pressure relief gap 62 for rapid pressure relief.

[0084] Specifically, Figures 10 to 12As shown, the second channel 6 includes a pressure relief port 61 opened in the pressing member 2, and the first channel 5 includes an air inlet 51 opened in the wall of the air chamber 31, and the diameter of the air inlet 51 is larger than the diameter of the pressure relief port 61, so that the flow rate of the first channel 5 is larger than the flow rate of the second channel 6. Or, as Figures 8 to 9 As shown, the pressing piece 2 is provided with a pressure relief port 61, and the cylinder 3 has an abutting portion 33 abutting against the pressure relief port 61 and provided with an air flow channel 63, and the diameter of the air flow channel 63 is smaller than the diameter of the pressure relief port 61, so that the flow rate of the second channel 6 is smaller than the flow rate of the first channel 5. Of course, the flow rates of the first channel 5 and the second channel 6 can also be adjusted by other means, such as providing a flow valve in at least one of the first channel 5 and the second channel 6, etc., which is not limited here.

[0085] In one embodiment, the second channel 6 is provided with a one-way valve, which has an on position and a off position. The one-way valve connects the sealing cavity 4 and the air chamber 31 at the on position and disconnects the sealing cavity 4 from the air chamber 31 at the off position.

[0086] After the control valve 9 connects the first channel 5 with the outside atmosphere, the outside air enters the air chamber 31 through the first channel 5. Since the second channel 6 is connected with the air chamber 31, the air pressure in the air chamber 31 is higher than the air pressure in the sealed cavity 4 at this time. The one-way valve switches to the conduction position, connecting the second channel 6 with the first channel 5, so that the outside air enters the sealed cavity 4 through the second channel 6. At the initial stage of vacuuming, the sealed cavity 4 is not formed yet, the air pressure in the sealed cavity 4 is atmospheric pressure, while the air pressure in the air chamber 31 decreases, the air pressure in the air chamber 31 is lower than the air pressure in the sealed cavity 4, and the one-way valve switches to the cut-off position to isolate the second channel 6 from the first channel 5. At this time, two vacuum pumps can be respectively provided, one of which is connected to the air chamber 31 for sucking the gas in the air chamber 31, and the other vacuum pump is connected to the sealed cavity 4 to suck the gas in the sealed cavity 4 after the sealing gasket 23 of the first pressing part 21 and the sealing gasket 23 of the second pressing part 22 abut to form the sealed cavity 4.

[0087] In another embodiment, if Fig.10As shown, the second channel 6 is provided with a stop valve 64 and a trigger part 65, and the driving part 32 has a first position under normal pressure and a second position under negative pressure. In the first position, the trigger part 65 is separated from the stop valve 64, and in the second position, the trigger part 65 cooperates with the stop valve 64; in the first position, when the air chamber 31 is under negative pressure relative to the sealed cavity 4, the stop valve 64 cuts off the connection between the second channel 6 and the air chamber 31, and when the air chamber 31 is under positive pressure relative to the sealed cavity 4, the stop valve 64 connects the second channel 6 with the air chamber 31; in the second position, the trigger part 65 pushes the stop valve 64 to connect the second channel 6 with the air chamber 31 to evacuate the sealed cavity 4.

[0088] When the air chamber 31 is in a normal pressure state, Fig.10 As shown, the stop valve 64 blocks the second channel 6 to isolate it from the air chamber 31. During the vacuuming process, the suction piece is connected to the air chamber 31. As the air pressure in the air chamber 31 decreases, the drive unit 32 moves to the second position. At this time, the trigger unit 65 cooperates with the stop valve 64 to connect the second channel 6 with the air chamber 31. At this time, only one suction piece connected to the air chamber 31 is used to perform vacuuming operations on the air chamber 31 and the sealed chamber 4, thereby reducing the number of suction pieces and saving costs. During the pressure relief process, the control valve 9 controls the first channel 5 to be connected to the outside atmosphere, and the air chamber 31 begins to relieve pressure. At this time, the air pressure in the air chamber 31 is positive relative to the sealed chamber 4. The stop valve 64 is turned on to connect the second channel 6 with the air chamber 31. The outside air enters the second channel 6 and the sealed chamber 4 through the air chamber 31, causing the sealed chamber 4 to begin to relieve pressure.

[0089] This embodiment does not limit the cooperation mode between the on-off valve 64 and the triggering part 65. In a specific embodiment, Fig.10As shown, the stop valve 64 can move relative to the second channel 6, and the trigger part 65 is arranged in the air chamber 31. During the vacuuming process, the air chamber 31 is at a negative pressure relative to the sealed cavity 4. Under the push of the air pressure, the stop valve 64 moves toward the air chamber 31 and abuts against the driving part 32 or the inner wall of the air chamber 31 to block the second channel 6. As the driving part 32 moves to the second position, the trigger part 65 in the air chamber 31 contacts the stop valve 64 and pushes the stop valve 64 to move away from the air chamber 31, so that the second channel 6 is connected to the air chamber 31, and the vacuum component connected to the air chamber 31 can extract the air in the sealed cavity 4 together. During the pressure relief process, the air chamber 31 is first connected to the outside atmosphere, and the air pressure in the air chamber 31 increases, so that the air chamber 31 is at a positive pressure relative to the sealed cavity 4. At this time, under the action of the air pressure difference, the stop valve 64 is pushed to move in a direction away from the air chamber 31 to connect the second channel 6 with the air chamber 31, so that the outside air can enter the sealed cavity 4 through the air chamber 31 and the second channel 6.

[0090] The above embodiment does not limit the location of the one-way valve, the stop valve 64 and the trigger unit 65 , which may be located inside the cylinder 3 , on the drive unit 32 , or at other locations of the second channel 6 .

[0091] In the above-mentioned embodiment of using the one-way valve, when the air chamber 31 is in a negative pressure or vacuum state, during the process of evacuating the sealed cavity 4, once the air chamber 31 has not completed evacuation, making the air pressure of the air chamber 31 positive pressure relative to the sealed cavity 4, the one-way valve is easily turned on, causing the air chamber 31 to leak, and the evacuation speed is slow, and the reliability is poor. In the embodiment using the stop valve 64 and the trigger unit 65, the stop valve 64 will be opened only when it is triggered by the trigger unit 65 or when the air chamber 31 is under positive pressure, and the trigger unit 65 will trigger the stop valve 64 only after the drive unit 32 moves into place under negative pressure. That is to say, the stop valve 64 closes the second channel 6 when the air chamber 31 is at normal pressure and under negative pressure when the drive unit 32 has not moved into place, and will open the second channel 6 only when the air chamber 31 is under positive pressure and when the drive unit 32 moves into place under negative pressure. Therefore, the pressure relief is faster and the air chamber 31 will not leak during the air extraction process, and the reliability is higher.

[0092] It should be noted that the vacuum sealer further includes a vacuum element, but the present application does not limit the number of the vacuum elements, which may be one of the following embodiments:

[0093] Implementation method 1: In this implementation method, Figures 8 to 12 As shown, the vacuum sealer includes a vacuum element, which is connected to the air chamber 31 through the first channel 5, and the air chamber 31 and the sealing cavity 4 are evacuated through the vacuum element.

[0094] When the second channel 6 is connected with the air chamber 31 and the first channel 5, a vacuum component can be provided to extract the air from the air chamber 31 and the sealed cavity 4. At the initial stage of vacuuming, the air pressure in the air chamber 31 decreases, and the driving part 32 drives the first pressing part 21 to move, and finally abuts against the second pressing part 22 to form the sealed cavity 4. Then the vacuum component continues to work to extract the gas in the sealed cavity 4.

[0095] Compared with the prior art that two suction parts are respectively provided to vacuum the cylinder air chamber and the sealing cavity, the present embodiment reduces the use of one suction part and only uses one suction part to communicate with the first channel 5, and the first channel 5 is communicated with the second channel 6. Therefore, when the suction part is evacuating air, the air in the air chamber 31 and the sealing cavity 4 will be evacuated by the suction part. This further simplifies the internal structure of the sealing machine, simplifies the complexity of the control program, and saves costs.

[0096] At the same time, the air evacuation and pressure relief of the sealing cavity 4 are both through the second channel 6, and the air evacuation and pressure relief of the air chamber 31 are both through the first channel 5, which helps to reduce the number of pipelines of the vacuum sealing machine, optimize the pipeline layout, and make the structure simpler.

[0097] Implementation method 2: In this implementation method, if Figure 2 , Figure 3 , Figures 5 to 7 , Figure 11 to Figure 12 As shown, the vacuum sealer includes a first vacuum component 7 and a second vacuum component 8. The first vacuum component 7 is connected to the air chamber 31, and the second vacuum component 8 is connected to the sealing cavity 4. The first vacuum component 7 and the second vacuum component 8 vacuum the air chamber 31 and the sealing cavity 4 respectively.

[0098] Preferably, the first air suction member 7 and the second air suction member 8 are both vacuum pumps.

[0099] In this embodiment, no matter how the second channel 6 is connected to the outside atmosphere, it will not affect the vacuuming effect of the first suction member 7 and the second suction member 8. At the same time, the first suction member 7 and the air chamber 31 can be connected through the first channel 5, or by setting an additional channel, and the second suction member 8 and the sealed cavity 4 can be connected through the second channel 6, or by setting an additional channel. And the use of double suction members to vacuum the sealed cavity 4 and the air chamber 31 respectively has a fast suction speed and high reliability.

[0100] Specifically, Figure 2 , Figure 3 As shown, the vacuum sealing machine includes a first pipeline 12 and a second pipeline 13, the first interface of the first pipeline 12 is connected to the suction port of the first vacuum member 7, the second interface of the first pipeline 12 is connected to the air chamber 31, and the third interface is connected to the control valve 9.

[0101] Among them, the number of the cylinders 3 can be Figures 2 to 4 As shown in the figure, there are two, and they are located on the left and right sides of the housing 1, respectively. The second interfaces are correspondingly set to two, respectively connected to the air chambers 31 on both sides. Of course, the cylinder 3 can also be set to one or more than two as needed, and the second interfaces are connected to the air chambers 31 of the cylinder 3 one by one.

[0102] like Figure 3 As shown, the first interface of the second pipeline 13 is connected to the suction port of the second vacuum member 8, the second interface is connected to the sealed cavity 4, and the third interface is connected to the control circuit board 14 to facilitate the control unit to detect the air pressure in the sealed cavity 4.

[0103] The second interface may be connected to the sealing cavity 4 through the first pressing portion 21 , or may be connected to the sealing cavity 4 through the second pressing portion 22 , which is not limited here.

[0104] like Figure 2 , Figure 3 As shown, the housing 1 is further provided with a micro switch 15 for detecting whether the first pressing part 21 moves into place. When the sealing gasket 23 of the first pressing part 21 abuts against and presses the sealing gasket 23 of the second pressing part 22, the micro switch 15 is triggered.

[0105] In the present application, the first pressing portion 21 can move toward the second pressing portion 22 under the drive of the driving portion 32. However, it should be noted that the present application does not limit the rebound mode of the first pressing portion 21, which can be one of the following embodiments:

[0106] Embodiment 1: In this embodiment, the driving part 32 can move relative to the first pressing part 21, and a reset member is provided between the two. When the air chamber 31 is depressurized, the driving part 32 moves and disengages from the first pressing part 21. As the sealing cavity 4 is depressurized, the reset member pulls the first pressing part 21 to move it in a direction away from the second pressing part 22 and reset it.

[0107] Embodiment 2: In this embodiment, the shell 1 is provided with an elastic member, and the elastic member acts on the first pressing part 21. When the first pressing part 21 moves toward the second pressing part 22 driven by the driving part 32, the elastic member is compressed. When the sealing chamber 4 is depressurized, the elastic member pushes the first pressing part 21 to move in a direction away from the second pressing part 22 to reset.

[0108] Embodiment 3: In this embodiment, the driving portion 32 cooperates with the first pressing portion 21 so that the first pressing portion 21 and the driving portion 32 move synchronously.

[0109] In this embodiment, the driving part 32 cooperates with the first pressing part 21 so that the two can move synchronously without relative movement. Thus, the first pressing part 21 can move with the driving part 32 when the driving part 32 moves.

[0110] In this embodiment, if Figures 5 to 10 As shown, the second channel 6 can be arranged at the first pressing part 21, so that the second channel 6 is always connected with the air chamber 31 and the first channel 5, the second channel 6 is depressurized through the first channel 5, and the outside air enters the sealed cavity 4 through the first channel 5, the air chamber 31, and the second channel 6. Figure 11 to Figure 12 As shown, the second channel 6 can also be arranged on the second pressing part 22, so that the opening and closing of the second channel 6 are not related to the movement of the first pressing part 21 and the positional relationship between the first pressing part 21 and the driving part 32. Figure 11 to Figure 12 As shown, the second channel 6 can be formed by providing an additional pipeline to connect the pressure relief port 61 on the second pressing part 22 with the air chamber 31 .

[0111] In addition, if Fig.12 As shown, when two vacuum parts are used to vacuum the air chamber 31 and the sealing cavity 4 respectively, an additional vacuum port 221 can be opened in the first pressing part 21 or the second pressing part 22 to make the vacuuming and pressure relief paths of the sealing cavity 4 independent of each other and not interfere with each other.

[0112] Each of the above embodiments can realize the vacuuming and pressure relief functions of the vacuum sealer. In the actual production process, each embodiment can be implemented separately, or multiple embodiments can be implemented in combination to form different solutions to meet actual needs. For example, from the perspective of work reliability, the best solution is: the driving part 32 and the first pressing part 21 can move relative to each other, and the cylinder 3 includes an abutment part 33, and the abutment part 33 blocks the pressure relief port 61 at the abutment position and opens the pressure relief port 61 at the separation position. The abutment part 33 abuts against the first pressing part 21 to drive the first pressing part 21 to move to form the sealing chamber 4. At the same time, the vacuum sealer includes a first suction member 7 and a second suction member 8. The first suction member 7 is connected to the air chamber 31 for sucking the gas in the air chamber 31, and the second suction member 8 is connected to the sealing chamber 4 for sucking the gas in the sealing chamber 4. This solution has high reliability, but relatively speaking, there are more parts, a complex structure, and a high cost.

[0113] For another example, from the perspective of production and manufacturing costs, the optimal solution is: the driving part 32 cooperates with the first pressing part 21 to make the two move synchronously, the abutting part 33 always abuts against the pressure relief port 61, and the first channel 5, the air chamber 31, the pressure relief port 61 and the sealed cavity 4 are connected in sequence. At the same time, a single exhaust component is used to communicate with the first channel 5 to exhaust the sealed cavity 4 and the air chamber 31. This solution can save a lot of pipelines and the use of an exhaust component, simplify the structure and save a lot of costs, but the reliability of the work is poor.

[0114] Considering the cost advantage and working reliability advantage, the following solution can be adopted:

[0115] Solution 1: The driving part 32 cooperates with the first pressing part 21 to make the two move synchronously, the abutting part 33 always abuts against the pressure relief port 61, and the first channel 5, the air chamber 31, the pressure relief port 61 and the sealed cavity 4 are connected in sequence. At the same time, a single exhaust component is used to communicate with the first channel 5 to exhaust the sealed cavity 4 and the air chamber 31. In addition, the one-way valve is set in the second channel 6 to control the airflow in the first channel 5 and the second channel 6 to flow only in one direction.

[0116] Solution 2: The driving part 32 cooperates with the first pressing part 21 to make the two move synchronously, the abutting part 33 always abuts against the pressure relief port 61, and the first channel 5, the air chamber 31, the pressure relief port 61 and the sealed cavity 4 are connected in sequence. At the same time, a single exhaust component is used to communicate with the first channel 5 to exhaust the sealed cavity 4 and the air chamber 31. At the same time, the on-off valve 64 and the trigger part 65 are set in the second channel 6, so that the on-off valve 64 can be turned on and off according to the triggering of the trigger part 65 and the relative air pressure in the air chamber 31 and the sealed cavity 4.

[0117] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0118] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0119] The above is only the embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A vacuum sealer, comprising a housing, the housing being provided with an insertion port for inserting a packaging bag, the insertion port being provided with a pressing piece, the pressing piece comprising a first pressing part and a second pressing part, the housing being further provided with a cylinder, the cylinder comprising an air chamber capable of forming a negative pressure and a driving part driven by the negative pressure, the driving part driving the first pressing part to move toward the second pressing part to form a sealing cavity, characterized in that: The sealing machine has a first channel connected to the air chamber and a second channel connected to the sealing cavity. The first channel is provided with a control valve, and the control valve is used to control the pressure relief of the air chamber under negative pressure through the first channel; the pressure relief of the air chamber causes the sealing cavity under negative pressure to relieve pressure through the second channel.

2. The vacuum sealer according to claim 1, characterized in that: The second channel includes a pressure relief port opened on the pressing piece, and one side of the pressure relief port is connected to the sealing cavity; The cylinder further comprises an abutting portion, wherein the abutting portion has an abutting position abutting against the pressure relief port and a separation position away from the pressure relief port under the control of the driving portion; The control valve controls the pressure relief of the air chamber so that the abutment portion is in the separation position, a pressure relief gap is formed between the abutment portion and the pressing part, and the other side of the pressure relief port is connected with the outside atmosphere through the pressure relief gap, and the outside atmosphere enters the sealing cavity through the pressure relief gap and the pressure relief port.

3. The vacuum sealer according to claim 2, characterized in that: The abutting portion is at the abutting position, and the first channel, the air chamber, the pressure relief port and the sealing cavity are connected in sequence.

4. The vacuum sealer according to claim 2, characterized in that: The abutting portion is at the abutting position, and the abutting portion blocks the pressure relief port.

5. The vacuum sealer according to claim 1, characterized in that: The first channel, the air chamber, the second channel and the sealing cavity are connected in sequence; The control valve controls the pressure relief of the air chamber, so that the outside atmosphere enters the sealed cavity through the first passage, the air chamber and the second passage.

6. The vacuum sealer according to claim 3 or 5, characterized in that: The flow rate of the second channel is smaller than the flow rate of the first channel.

7. The vacuum sealer according to claim 3 or 5, characterized in that: The second passage is provided with a one-way valve, the one-way valve having a conducting position and a shutoff position, the one-way valve enables the sealing cavity to communicate with the air chamber at the conducting position, and disconnects the sealing cavity from the air chamber at the shutoff position; or, The second channel is provided with a stop valve and a trigger part, and the driving part has a first position under normal pressure and a second position under negative pressure. In the first position, the trigger part is separated from the stop valve, and in the second position, the trigger part cooperates with the stop valve; in the first position, when the air chamber is under negative pressure relative to the sealed chamber, the stop valve cuts off the connection between the second channel and the air chamber, and when the air chamber is under positive pressure relative to the sealed chamber, the stop valve connects the second channel with the air chamber; in the second position, the trigger part pushes the stop valve to connect the second channel with the air chamber to evacuate the sealed chamber.

8. The vacuum sealer according to claim 3 or 5, characterized in that: The vacuum sealer comprises an exhaust member, which is connected to the air chamber through the first channel, and the air chamber and the sealing cavity are evacuated through the exhaust member.

9. The vacuum sealer according to claim 1, characterized in that: The vacuum sealer comprises a first vacuum member and a second vacuum member, wherein the first vacuum member is connected to the air chamber, and the second vacuum member is connected to the sealing cavity, and the first vacuum member and the second vacuum member vacuumize the air chamber and the sealing cavity respectively.

10. The vacuum sealer according to any one of claims 1 to 5 or 9, characterized in that: The driving portion cooperates with the first pressing portion so that the first pressing portion and the driving portion move synchronously.

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