Vacuum sealing machine

Abstract

The utility model discloses a vacuum sealing machine, belongs to the technical field of sealing machines, and aims to overcome the defect that the reliability of the conventional sealing machine for detecting the water level of a lower vacuum tank is poor. The sealing machine comprises a machine body and a lower sealing seat mounted on the machine body, and a lower sealing cavity is formed in the lower sealing seat; a photoelectric liquid level detection device is arranged in the sealing machine and comprises a light emitting element and a light receiving element, the positions of the light emitting element and the light receiving element are lower than the position of an upper end opening of the lower sealing cavity, and the light emitting element emits light into the lower sealing cavity so that when the liquid level in the lower sealing cavity reaches the preset height, the liquid level in the lower sealing cavity can be detected. The light receiving state of the light receiving element changes. Due to the fact that the positions of the light emitting element and the light receiving element are lower than the position of the upper port of the lower sealing cavity, the path of the light emitted by the light emitting element transmitted to the light receiving element is not shielded by the sealing bag, and the liquid level in the lower sealing cavity can be detected more reliably.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing machines and relates to a vacuum sealing machine. Background Art

[0002] Chinese patent literature discloses a utility model patent for a vacuum sealer with a liquid level detection device, with the authorization announcement number CN214690396U. The vacuum sealer includes a housing, an upper vacuum groove and a lower vacuum groove are arranged in the housing, a vacuum chamber is formed between the upper vacuum groove and the lower vacuum groove, the vacuum chamber is connected to a vacuum pump through a conduit, a float is arranged in the lower vacuum groove, which rises and falls with the liquid level, and also includes a detection device for detecting the position of the float. The detection device is a photoelectric sensor, a grating sensor or a laser sensor, and the photoelectric sensor is located on the upper side of the lower vacuum groove, and the water level in the lower vacuum groove is judged by the position change of the float. The float of the sealer with this structure is easy to get stuck, and there may be a sealing bag between the detection device and the float. The thickness and color of the sealing bag will affect the light of the detection device from reaching the float, and the detection device is prone to misjudgment, and the reliability of detecting the water level in the lower vacuum groove is poor. Summary of the invention

[0003] The utility model proposes a vacuum sealing machine in view of the problems existing in the prior art, aiming to overcome the defect that the reliability of the existing sealing machine in detecting the water level of the lower vacuum tank is poor.

[0004] The utility model is achieved in this way:

[0005] A vacuum sealing machine comprises a machine body and a lower sealing seat mounted on the machine body, wherein the lower sealing seat has a lower sealing cavity;

[0006] A photoelectric liquid level detection device is provided in the sealing machine, and the photoelectric liquid level detection device includes a light emitting element and a light receiving element. The positions of the light emitting element and the light receiving element are lower than the upper port position of the lower sealing cavity. The light emitting element emits light into the lower sealing cavity, so that when the liquid level in the lower sealing cavity reaches a preset height, the state of the light receiving element receiving light changes.

[0007] When the liquid level in the lower sealing chamber does not reach the preset height, it means that there is no liquid or only a small amount of liquid in the lower sealing chamber, and the sealing machine can work normally. When the liquid level in the lower sealing chamber reaches the preset height, the state of the light receiving element receiving light changes, so that the controller in the sealing machine can control the sealing to not enter the working state according to the state change of the light receiving element, so as to remind the user to deal with the liquid in the lower sealing chamber in time, avoid the liquid in the lower sealing chamber from overflowing or being sucked into the vacuum pump, reduce the risk of damage to the sealing machine, and improve the safety of the sealing machine.

[0008] The sealing bag is located above the lower sealing cavity. Since the positions of the light emitting element and the light receiving element are lower than the upper port position of the lower sealing cavity, the light emitted by the light emitting element will not be blocked by the sealing bag on the path of transmission to the light receiving element, and the photoelectric liquid level detection device has no floating parts and will not get stuck, so it can more reliably detect the liquid level in the lower sealing cavity. The photoelectric liquid level detection device uses the difference in refractive index of light in the air and in the liquid, and the different propagation paths of light through the air and through the liquid, so as to control whether the light receiving element can receive the light, so as to judge whether the liquid level in the lower sealing cavity reaches the preset height, and the structure is simple and reliable.

[0009] Preferably, the light emitting element and the light receiving element are located on the same side of the lower sealed cavity, and the photoelectric liquid level detection device further includes an optical lens, so that when the liquid level in the lower sealed cavity reaches a preset height, the light emitted by the light emitting element switches from total reflection in the optical lens to refraction into the lower sealed cavity. Since the refractive index of the liquid represented by water is greater than the refractive index of air, the first critical angle of the light incident on the air from the optical lens is smaller than the second critical angle of the light incident on the water from the optical lens, when the incident angle of the light in the optical lens is between the first critical angle and the second critical angle, there is no liquid in the lower sealed cavity or the liquid level is lower than the preset height, the light emitted by the light emitting element is totally reflected in the optical lens and received by the light receiving element; when the liquid level in the lower sealed cavity reaches the preset height, the light emitted by the light emitting element is refracted into the liquid, and the light receiving element cannot receive the light, so that the light receiving element switches from a state in which it can receive light to a state in which it cannot receive light, and the controller in the sealing machine can control the sealing machine to switch from being able to work normally to being unable to work normally according to this state change, and the sealing machine cannot work normally, including the vacuum pump and the heating wire not working.

[0010] Preferably, the light emitting element and the light receiving element are arranged vertically, and the light emitting element is located below the light receiving element, so that the position where the light is incident into the lower sealed cavity is lower, and the presence of liquid in the lower sealed cavity can be detected more sensitively.

[0011] Preferably, the light emitting element and the light receiving element are arranged horizontally, so that the position where the light is incident into the lower sealed cavity can be higher, which is convenient for storing more liquid in the lower sealed cavity, avoiding users from pouring water frequently, and improving user experience.

[0012] Preferably, the light emitting element and the light receiving element are both fixed on the body, the lower sealing seat is detachably mounted on the body, and an optical lens is provided on the lower sealing seat so that when the liquid level in the lower sealing cavity reaches a preset height or the lower sealing seat is separated from the body, the light emitted by the light emitting element deviates from the light receiving element. The failure of the lower sealing seat to be installed or the liquid level in the lower sealing cavity to reach a preset height are both abnormal states of the sealing machine, and both abnormal states correspond to the state where the light receiving element cannot receive light, so that the same photoelectric liquid level detection device can avoid working when the lower sealing seat is not installed, and can also avoid working when the liquid level in the lower sealing cavity is too high, thereby reducing the risk of user misoperation and improving the reliability of the sealing machine.

[0013] Preferably, the optical lens is disposed through the side wall of the lower sealed cavity and is sealed with the side wall of the lower sealed cavity, thereby avoiding interference of the side wall of the lower sealed cavity with light, improving the controllability of the installation position of the photoelectric liquid level detection device, and improving assembly efficiency.

[0014] Preferably, the light emitting element and the light receiving element are both fixed on the lower sealing seat, and a water collecting box is detachably provided in the lower sealing cavity, and an optical lens is provided on the water collecting box, so that when the liquid level in the water collecting box reaches a preset height or the water collecting box is separated from the lower sealing seat, the light emitted by the light emitting element deviates from the light receiving element. The liquid entering the lower sealing cavity is collected by the water collecting box, so that the liquid in the lower sealing cavity is easily cleaned.

[0015] Preferably, the light emitting element and the light receiving element are located at the bottom of the lower sealed cavity, and the light emitted by the light emitting element directly enters the lower sealed cavity, so that when the liquid level in the lower sealed cavity reaches a preset height, the light emitted by the light emitting element is totally reflected in the lower sealed cavity. When there is no liquid in the lower sealed cavity, the light directly entering the lower sealed cavity will not be reflected, and the light receiving element cannot receive the light; when there is liquid in the lower sealed cavity, the light entering the lower sealed cavity first enters the liquid, and since the air is adjacent to the upper surface of the liquid, as long as the incident angle of the light in the liquid is controlled to be greater than the critical angle of the liquid entering the air, the total reflection of the incident liquid light can be achieved, and the light receiving element receives the totally reflected light, so that the light receiving element switches from a state of not receiving light to a state of receiving light, thereby realizing the detection of the liquid level in the lower sealed cavity.

[0016] Preferably, the light emitting element and the light receiving element are located on opposite sides of the lower sealed cavity, so that when the liquid level of the lower sealed cavity reaches a preset height, the light emitted by the light emitting element is refracted to the light receiving element. When there is no liquid in the lower sealed cavity or the liquid level does not reach the preset height, the light emitted by the light emitting element passes through the lower sealed cavity and deviates from the light receiving element, and the light receiving element cannot receive the light; when the liquid level of the lower sealed cavity reaches the preset height, under the refraction of the liquid, the path of the light emitted by the light emitting element changes, and the light passes through the lower sealed cavity and just enters the light receiving element, so that the light receiving element switches from a state of not receiving light to a state of receiving light, thereby realizing the detection of the liquid level in the lower sealed cavity.

[0017] Preferably, the light emitting element and the light receiving element are located on opposite sides of the lower sealed cavity, so that when the liquid level of the lower sealed cavity reaches a preset height, the light emitted by the light emitting element deviates from the light receiving element;

[0018] The lower sealing seat is detachably mounted on the machine body, the light emitting element is fixed on the machine body, and the light receiving element is fixed on the lower sealing seat. The failure of the lower sealing seat to be installed or the liquid level in the lower sealing cavity to reach a preset height are both abnormal states of the sealing machine. Both abnormal states correspond to the state in which the light receiving element cannot receive light, so that the same photoelectric liquid level detection device can avoid working when the lower sealing seat is not installed and avoid working when the liquid level in the lower sealing cavity is too high, thereby reducing the risk of user misoperation and improving the reliability of the sealing machine.

[0019] The vacuum sealing machine provided by the utility model has a light emitting element and a light receiving element located below the upper port of the lower sealing chamber, so that the light emitted by the light emitting element will not be blocked by the sealing bag on the path of transmission to the light receiving element, and the liquid level in the lower sealing chamber can be detected more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The exploded structure diagram of the sealing machine;

[0021] Figure 2 It is a cross-sectional view of the local structure of the sealing machine when there is no liquid in the lower sealing chamber;

[0022] Figure 3 This is a cross-sectional view of the local structure of the sealing machine when the liquid level in the lower sealing chamber reaches a preset height.

[0023] Explanation of the accompanying drawings: 100, machine body; 110, upper sealing seat; 111, heating wire; 112, insulating member; 113, upper sealing ring; 120, vacuum pump; 130, upper cover; 200, lower sealing seat; 210, lower sealing ring; 220, lower sealing chamber; 300, photoelectric liquid level detection device; 310, detection head; 311, light emitting element; 312, light receiving element; 320, optical lens; 400, liquid. DETAILED DESCRIPTION

[0024] The following will further describe the specific implementation of the utility model in combination with the accompanying drawings of the embodiments, so that the technical solution of the utility model is easier to understand and grasp. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0025] This embodiment provides a vacuum sealer, such as Figure 1 As shown, it includes a body 100, on which an upper sealing seat 110, a lower sealing seat 200, a vacuum pump 120 and an upper cover 130 are installed. The upper sealing seat 110 is provided with a heating wire 111, an insulating member 112, an upper sealing ring 113 and an upper sealing cavity. The lower sealing seat 200 is provided with a lower sealing ring 210 and a lower sealing cavity 220. The upper sealing ring 113 and the lower sealing ring 210 abut against each other so that the upper sealing cavity and the lower sealing cavity 220 constitute a vacuum chamber.

[0026] like Figure 1 As shown in Figure 3, a photoelectric liquid level detection device 300 is provided in the sealing machine. The photoelectric liquid level detection device 300 includes a light emitting element 311 and a light receiving element 312. The positions of the light emitting element 311 and the light receiving element 312 are lower than the upper port position of the lower sealing cavity 220. The light emitting element 311 emits light into the lower sealing cavity 220, so that when the liquid level in the lower sealing cavity 220 reaches a preset height, the state of the light receiving element 312 receiving light changes.

[0027] like Figure 2 As shown, when the liquid level in the lower sealing cavity 220 does not reach the preset height, it means that there is no liquid 400 or only a small amount of liquid 400 in the lower sealing cavity 220, and the sealing machine can work normally. Figure 3 As shown, when the liquid level in the lower sealing cavity 220 reaches a preset height, the state of the light receiving element 312 receiving light changes, so that the controller in the sealing machine can control the sealing to not enter the working state according to the state change of the light receiving element 312, so as to remind the user to deal with the liquid 400 in the lower sealing cavity 220 in time, avoid the liquid 400 in the lower sealing cavity 220 from overflowing or being sucked into the vacuum pump 120, reduce the risk of damage to the sealing machine, and improve the safety of using the sealing machine.

[0028] The sealing bag is located above the lower sealing cavity 220. Since the positions of the light emitting element 311 and the light receiving element 312 are lower than the upper port position of the lower sealing cavity 220, the light emitted by the light emitting element 311 will not be blocked by the sealing bag on the path of the light receiving element 312, and the photoelectric liquid level detection device 300 has no floating parts and will not get stuck, so it can more reliably detect the liquid level in the lower sealing cavity 220. The photoelectric liquid level detection device 300 uses the difference in refractive index of light in the air and in the liquid 400, and the different propagation paths of light through the air and through the liquid 400, so as to control whether the light receiving element 312 can receive the light, so as to judge whether the liquid level in the lower sealing cavity 220 has reached a preset height, and the structure is simple and reliable.

[0029] like Figure 1 As shown in FIG. 3 , the light emitting element 311 and the light receiving element 312 are located on the same side of the lower sealed cavity 220. The light emitting element 311 and the light receiving element 312 are integrated and installed to form a detection head 310. The photoelectric liquid level detection device 300 also includes an optical lens 320, so that when the liquid level in the lower sealed cavity 220 reaches a preset height, the light emitted by the light emitting element 311 switches from total reflection to refraction into the lower sealed cavity 220 in the optical lens 320. Since the refractive index of the liquid 400 represented by water is greater than the refractive index of air, the first critical angle of the light incident on the air from the optical lens 320 is smaller than the second critical angle of the light incident on the water from the optical lens 320. When the incident angle of the light in the optical lens 320 is between the first critical angle and the second critical angle, there is no liquid 400 in the lower sealing cavity 220 or the liquid level is lower than the preset height, the light emitted by the light emitting element 311 is totally reflected in the optical lens 320 and received by the light receiving element 312; when the liquid level in the lower sealing cavity 220 reaches the preset height, the light emitted by the light emitting element 311 is refracted into the liquid 400, and the light receiving element 312 cannot receive the light, so that the light receiving element 312 switches from a state in which it can receive light to a state in which it cannot receive light. The controller in the sealing machine can control the sealing machine to switch from being able to work normally to being unable to work normally according to this state change. The malfunction of the sealing machine includes the vacuum pump 120 and the heating wire 111 not working. In other optional embodiments, the optical lens 320 may not be provided, the lower sealing seat 200 is made of a transparent material, and a local position of the side wall of the lower sealing cavity 220 is used as a total reflection lens.

[0030] like Figure 2As shown, the light emitting element 311 and the light receiving element 312 are arranged vertically, and the light emitting element 311 is located below the light receiving element 312. In this way, the position where the light is incident into the lower sealed cavity 220 is lower, and the presence of liquid 400 in the lower sealed cavity 220 can be detected more sensitively.

[0031] In other optional embodiments, the light emitting element 311 is located above the light receiving element 312, or the light emitting element 311 and the light receiving element 312 are arranged horizontally. In this way, the position where the light is incident on the lower sealed cavity 220 can be higher, which is convenient for storing more liquid 400 in the lower sealed cavity 220, avoiding users from pouring water frequently, and improving user experience.

[0032] Furthermore, the light emitting element 311 and the light receiving element 312 are both fixed on the body 100, the lower sealing seat 200 is detachably mounted on the body 100, and an optical lens 320 is provided on the lower sealing seat 200, so that when the liquid level in the lower sealing cavity 220 reaches a preset height or the lower sealing seat 200 is separated from the body 100, the light emitted by the light emitting element 311 deviates from the light receiving element 312. The fact that the lower sealing seat 200 is not installed or the liquid level in the lower sealing cavity 220 reaches a preset height are both abnormal states of the sealing machine, and both abnormal states correspond to the state that the light receiving element 312 cannot receive light, so that the same photoelectric liquid level detection device 300 can avoid working when the lower sealing seat 200 is not installed, and can also avoid working when the liquid level in the lower sealing cavity 220 is too high, thereby reducing the risk of user misoperation and improving the reliability of the sealing machine. In other optional embodiments, the light emitting element 311 , the light receiving element 312 and the optical lens 320 may also be fixed on the lower sealing seat 200 or the body 100 .

[0033] like Figure 2 As shown in FIG. 3 , the optical lens 320 is disposed through the side wall of the lower sealed cavity 220 and is sealed with the side wall of the lower sealed cavity 220. This can avoid the interference of the side wall of the lower sealed cavity 220 on the light, improve the controllability of the installation position of the photoelectric liquid level detection device 300, and improve the assembly efficiency.

[0034] In this embodiment, when the lower sealed cavity 220 contains liquid 400, the liquid 400 directly contacts the side wall of the lower sealed cavity 220. In other optional embodiments, when the lower sealed cavity 220 contains liquid 400, the liquid 400 may not directly contact the side wall of the lower sealed cavity 220. Specifically, a detachable water collecting box is provided in the lower sealed cavity 220, the light emitting element 311 and the light receiving element 312 are both fixed on the lower sealed seat 200, and an optical lens 320 is provided on the water collecting box, so that when the liquid level in the water collecting box reaches a preset height or the water collecting box is separated from the lower sealed seat 200, the light emitted by the light emitting element 311 deviates from the light receiving element 312. The liquid 400 entering the lower sealed cavity 220 is collected by the water collecting box, so that the liquid 400 in the lower sealed cavity 220 is easily cleaned. The water collecting box is not installed or the liquid level in the water collecting box reaches a preset height, both of which are abnormal states of the sealing machine. Both abnormal states correspond to the state in which the light receiving element 312 cannot receive light, so that the same photoelectric liquid level detection device 300 can avoid working when the water collecting box is not installed and avoid working when the liquid level in the water collecting box is too high, reducing the risk of user misoperation and improving the reliability of the sealing machine. The liquid level in the water collecting box reaches a preset height is an embodiment of the liquid level in the lower sealing chamber 220 reaching a preset height.

[0035] The photoelectric liquid level detection device 300 of this embodiment has an optical lens 320, and the light emitting element 311 and the light receiving element 312 are located on the same side of the lower sealed cavity 220. In other optional embodiments, the photoelectric liquid level detection device 300 may not have the optical lens 320. Specifically, the light emitting element 311 and the light receiving element 312 are located at the bottom of the lower sealed cavity 220, and the light emitted by the light emitting element 311 directly enters the lower sealed cavity 220, so that when the liquid level of the lower sealed cavity 220 reaches a preset height, the light emitted by the light emitting element 311 is totally reflected in the lower sealed cavity 220. When there is no liquid 400 in the lower sealed cavity 220, the light directly incident on the lower sealed cavity 220 will not be reflected, and the light receiving element 312 cannot receive the light; when there is liquid 400 in the lower sealed cavity 220, the light incident on the lower sealed cavity 220 first enters the liquid 400. Since the air is adjacent to the upper surface of the liquid 400, as long as the incident angle of the light in the liquid 400 is controlled to be greater than the critical angle of the liquid 400 incident on the air, total reflection of the light incident on the liquid 400 can be achieved, and the light receiving element 312 receives the totally reflected light, so that the light receiving element 312 switches from a state of not receiving light to a state of receiving light, thereby realizing liquid level detection in the lower sealed cavity 220.

[0036] In other optional embodiments, the light emitting element 311 and the light receiving element 312 are located on opposite sides of the lower sealed cavity 220, so that when the liquid level of the lower sealed cavity 220 reaches a preset height, the light emitted by the light emitting element 311 is refracted to the light receiving element 312. When there is no liquid 400 in the lower sealed cavity 220 or the liquid level does not reach the preset height, the light emitted by the light emitting element 311 passes through the lower sealed cavity 220 and deviates from the light receiving element 312, and the light receiving element 312 cannot receive the light; when the liquid level of the lower sealed cavity 220 reaches the preset height, under the refraction of the liquid 400, the path of the light emitted by the light emitting element 311 changes, and the light passes through the lower sealed cavity 220 and just enters the light receiving element 312, so that the light receiving element 312 switches from a state of not receiving light to a state of receiving light, thereby realizing the detection of the liquid level in the lower sealed cavity 220.

[0037] In other embodiments where the light emitting element 311 and the light receiving element 312 are located on opposite sides of the lower sealed cavity 220, the light emitted by the light emitting element 311 may deviate from the light receiving element 312 when the liquid level in the lower sealed cavity 220 reaches a preset height. The lower sealing seat 200 is detachably mounted on the body 100, the light emitting element 311 is fixed on the body 100, and the light receiving element 312 is fixed on the lower sealing seat 200. The lower sealing seat 200 is not installed or the liquid level in the lower sealed cavity 220 reaches a preset height, which are both abnormal states of the sealing machine. Both abnormal states correspond to the state where the light receiving element 312 cannot receive light, so that the same photoelectric liquid level detection device can avoid working when the lower sealing seat 200 is not installed, and can also avoid working when the liquid level in the lower sealed cavity 220 is too high, thereby reducing the risk of user misoperation and improving the reliability of the sealing machine.

[0038] In the description of the present invention, it should be understood that the terms "center", "lateral", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0040] Those skilled in the art should understand that although the implementation methods disclosed in the embodiments of the present invention are as above, the contents described are only implementation methods adopted to facilitate understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Any technician in the field to which the embodiments of the present invention belong may make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the embodiments of the present invention, but the scope of patent protection of the embodiments of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A vacuum sealing machine, comprising a machine body and a lower sealing seat mounted on the machine body, wherein the lower sealing seat has a lower sealing cavity; It is characterized in that A photoelectric liquid level detection device is provided in the sealing machine, and the photoelectric liquid level detection device includes a light emitting element and a light receiving element. The positions of the light emitting element and the light receiving element are lower than the upper port position of the lower sealing cavity. The light emitting element emits light into the lower sealing cavity, so that when the liquid level in the lower sealing cavity reaches a preset height, the state of the light receiving element receiving light changes.

2. A vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are located on the same side of the lower sealed cavity. The photoelectric liquid level detection device also includes an optical lens, so that when the liquid level in the lower sealed cavity reaches a preset height, the light emitted by the light emitting element switches from total reflection to refraction into the lower sealed cavity in the optical lens.

3. A vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are arranged vertically, and the light emitting element is located below the light receiving element.

4. A vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are arranged in a transverse manner.

5. A vacuum sealer according to any one of claims 1 to 4, characterized in that: The light emitting element and the light receiving element are both fixed on the body, and the lower sealing seat is detachably mounted on the body. An optical lens is provided on the lower sealing seat so that when the liquid level in the lower sealing cavity reaches a preset height or the lower sealing seat is separated from the body, the light emitted by the light emitting element deviates from the light receiving element.

6. A vacuum sealer according to claim 5, characterized in that: The optical lens is disposed through the side wall of the lower sealed cavity and is sealed and matched with the side wall of the lower sealed cavity.

7. A vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are both fixed on the lower sealing seat. A water collecting box is detachably arranged in the lower sealing cavity. An optical lens is provided on the water collecting box so that when the liquid level in the water collecting box reaches a preset height or the water collecting box is separated from the lower sealing seat, the light emitted by the light emitting element deviates from the light receiving element.

8. The vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are located at the bottom of the lower sealed cavity, and the light emitted by the light emitting element directly enters the lower sealed cavity, so that when the liquid level of the lower sealed cavity reaches a preset height, the light emitted by the light emitting element is totally reflected in the lower sealed cavity.

9. The vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are located on opposite sides of the lower sealed cavity, so that when the liquid level of the lower sealed cavity reaches a preset height, the light emitted by the light emitting element is refracted to the light receiving element.

10. The vacuum sealer according to claim 1, characterized in that: The light emitting element and the light receiving element are located on opposite sides of the lower sealed cavity, so that when the liquid level of the lower sealed cavity reaches a preset height, the light emitted by the light emitting element deviates from the light receiving element; The lower sealing seat is detachably mounted on the machine body, the light emitting element is fixed on the machine body, and the light receiving element is fixed on the lower sealing seat.

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