Vacuum sealing machine

Abstract

The utility model belongs to the technical field of vacuum sealer products, and particularly discloses a vacuum sealer which comprises a base and an upper cover, the upper cover is movably hinged to one side of the base, a vacuum pump, a control circuit board and a power line are arranged on the base, and the vacuum pump is electrically connected with the control circuit board. When the base and the upper cover are closed, an upper vacuum cavity and a lower vacuum cavity are formed in the corresponding positions of the binding face, sealing rings are arranged on the periphery of the upper vacuum cavity and the periphery of the lower vacuum cavity respectively, a sealing heating piece assembly electrically connected with the control circuit board is arranged on the front side of the base, and a heat sealing strip matched with the heating piece assembly is arranged at the corresponding position of the front side of the upper cover. The heating piece assembly comprises a metal heating piece and a high-temperature-resistant insulating film, and the metal heating piece is in the shape of one or more hollow and coherent lines which are densely arranged in a curled mode. The vacuum sealing machine can be heated by mains supply, does not need to be converted through additional equipment for converting high pressure into low pressure, saves energy, reduces consumption, and is high in heating efficiency, large in sealing area, good in sealing effect, good in stability and low in manufacturing cost.

Description

Technical Field

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

[0002] At present, a vacuum sealing machine evacuates a vacuum packaging bag through a vacuum pumping device, and then heat-seals the bag mouth of the vacuum packaging bag through a heat-sealing process. By storing food in the evacuated vacuum packaging bag through the vacuum sealing machine, the vacuum degree can be maintained for a long time to achieve the fresh-keeping performance of the food.

[0003] In the prior art, the commonly used heating devices of vacuum sealing machines have the following forms:

[0004] First, the heating device uses a flat strip-shaped metal heating strip. However, the resistance value of this metal heating strip is small, and it cannot be directly powered by the mains for heating. It needs to be controlled by a PCBA to reduce the heating voltage, and a device for converting high voltage to low voltage is required, which will increase the manufacturing cost. In order to comprehensively consider the cost of the product, the heating power is controlled at about 120 watts. Under the condition of controlling the heating power, the sealing width of the heating strip can only be 2 - 3 mm, resulting in a low heating power and a small sealing width, which affects the sealing performance of the sealing part of the vacuum sealing machine.

[0005] Second, the heating device is a metal heating wire, which is pre-spirally wound outside an insulating rod. Its disadvantages are complex manufacturing process, poor heat transfer effect, reduced contact area with the bag mouth of the packaging bag, narrow sealing area, poor heat-sealing effect, and easy uneven sealing, which greatly affects the sealing performance of the seal.

[0006] Therefore, it is extremely urgent to develop a vacuum sealing machine that can be heated by the mains without the need for an additional device to convert high voltage to low voltage, and at the same time has high heating efficiency and a large sealing area. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a vacuum sealing machine that can be heated by the mains without the need for an additional device to convert high voltage to low voltage, and at the same time has high heating efficiency, a large sealing area, good sealing effect, good stability, and low manufacturing cost.

[0008] In order to achieve the above technical purpose, the utility model is implemented according to the following technical solutions:

[0009] A vacuum sealer according to the present utility model includes a base. The upper cover is movably hinged to one side of the base. A vacuum pump, a control circuit board, and a power cord are provided inside the base. The vacuum pump is electrically connected to the control circuit board. Upper and lower vacuum cavities are provided at positions corresponding to the mating surfaces when the base and the upper cover are closed. Sealing rings are respectively provided around the upper vacuum cavity and the lower vacuum cavity. A sealing heating element assembly electrically connected to the control circuit board is provided on the front side of the base. A heat sealing strip cooperating with the heating element assembly is provided at a corresponding position on the front side of the upper cover. The heating element assembly includes a metal heating element and a high-temperature resistant insulating film covering the metal heating element. The metal heating element is in the form of one or more continuous curly and densely arranged strip-shaped hollow structures, so that its heating resistance value is greatly increased. The metal heating element is adhered with a high-temperature resistant resin and a high-temperature resistant insulating film for fixing its shape and heat insulation and insulation purposes.

[0010] As a further improvement of the above technology, connecting wires are provided at both ends of the metal heating element, and the connecting wires are directly electrically connected to the mains voltage terminal of the control circuit board.

[0011] As a further improvement of the above technology, the hollowing of the metal heating element is formed by chemical etching and then adhered between a high-temperature resistant resin and a high-temperature resistant insulating film.

[0012] As a further improvement of the above technology, the metal heating element has a structure in which a single metal wire is evenly bent and densely arranged.

[0013] As a further improvement of the above technology, the metal heating element has a structure in which at least two metal wires are evenly bent and densely arranged.

[0014] As a further improvement of the above technology, the heating element assembly further includes a high-temperature resistant transparent adhesive tape, a mounting bracket, and a heat conducting sheet. The heat conducting sheet and the metal heating element covered with a high-temperature resistant insulating film are mounted on the mounting bracket. A temperature control switch and a temperature control switch fixing bracket, a thermistor, and a thermistor fixing bracket are respectively provided on the left and right sides of the mounting bracket.

[0015] As a further improvement of the above technology, both the temperature control switch and the thermistor are electrically connected to the heating device. The temperature control switch automatically controls the working time or heating power of the temperature control switch according to the temperature data detected by the thermistor to control the working temperature of the metal heating element.

[0016] As a further improvement of the above technology, both ends of the high-temperature resistant insulating film are bent inward to the bottom, and connection pieces with mounting holes extend inward. Both ends of the high-temperature resistant transparent adhesive tape are bent inward to the bottom with bending edges. The high-temperature resistant transparent adhesive tape and the high-temperature resistant insulating film successively cover the upper surface and both ends of the metal heating sheet, the heat conducting sheet, and the mounting bracket. The connection pieces at both ends of the high-temperature resistant insulating film are fixed to the bottom of the mounting bracket.

[0017] As a further improvement of the above technology, the width of the heat-sealing of the vacuum sealer is 5 - 12 mm, the heat efficiency is above 150 W, and the heat-sealing temperature during heating is 150 - 200 °C.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] (1) In the present utility model, the heating sheet assembly includes a metal heating sheet and a high-temperature resistant insulating film covering the metal heating sheet. The metal heating sheet is in the form of one or more continuous curly and densely arranged line shapes with a hollow structure, so that its heating resistance value is greatly increased. The metal heating sheet is attached with a high-temperature resistant insulating film for the purpose of fixing its shape and heat insulation and insulation.

[0020] (2) In the present utility model, connection wires are provided at both ends of the metal heating sheet. The connection wires are directly electrically connected to the mains voltage terminal of the control circuit board, and it can be heated by the mains power supply without the need for further step-down processing on the power-on circuit, saving manufacturing costs, simplifying the circuit, and saving energy and reducing consumption;

[0021] (3) In the present utility model, the width of the heat-sealing of the vacuum sealer can reach 5 - 12 mm. The sealing width is relatively large, the sealing effect is good, the sealing performance is strong, effectively reducing the generation of defective products caused by a relatively narrow sealing width, and greatly improving the reliability and stability of the vacuum sealing;

[0022] (4) The vacuum sealer of the present utility model can ensure a relatively high heating power (above 150 W) and a relatively high heat-sealing temperature (150 - 200 °C) without increasing any costs, effectively reducing the heat-sealing time and improving work efficiency. Description of the Drawings

[0023] The following is a detailed description of the present utility model in conjunction with the drawings and specific embodiments:

[0024] Figure 1 is the structural schematic diagram of the vacuum sealer described in the present utility model Figure 1 ;

[0025] Figure 2 is the structural schematic diagram of the vacuum sealer described in the present utility model Figure 2 ;

[0026] Figure 3 It is a schematic diagram of the three-dimensional exploded structure of the heating sheet assembly in the present utility model;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the heating sheet assembly in the present utility model;

[0028] Figure 5 It is the above Figure 4 The described top view;

[0029] Figure 6 It is the above Figure 4 Internal side sectional view;

[0030] Figure 7 It is the above Figure 4 Side view (seen from the back);

[0031] Figures 8 - 12 It is a schematic diagram of the structures of five different structural arrangement forms of metal heating sheets. Specific embodiments

[0032] Embodiment 1:

[0033] As shown in Figure 1 and Figure 2 , a vacuum sealer described in the present utility model includes an upper cover 1 and a base 2. One side of the upper cover 1 and the base 2 is movably hinged through a hinge 9. A vacuum pump 11, a control circuit board 10, and a power cord are provided inside the base 2. The vacuum pump 11 is electrically connected to the control circuit board 10. Upper and lower vacuum cavities 8 and 5 are provided at positions corresponding to the joint surfaces when the base 2 and the upper cover 1 are closed. Upper and lower sealing rings 6 and 3 are respectively provided around the upper and lower vacuum cavities 8 and 5. A sealing heating sheet assembly 20 electrically connected to the control circuit board 10 is provided on the front side of the base 2. A heat sealing strip 7 cooperating with the heating sheet assembly 20 is provided at a corresponding position on the front side of the upper cover 1. The heating sheet assembly 20 includes a metal heating sheet 21 and a high-temperature resistant insulating film 22 covering the metal heating sheet 21. The metal heating sheet 21 is in the form of one or more continuous curly and densely arranged strip-shaped hollowed-out lines, so that its heating resistance value is greatly increased. The metal heating sheet 21 is attached with a high-temperature resistant resin and a high-temperature resistant insulating film 22 for the purpose of fixing its shape and heat insulation.

[0034] As shown in Figures 3 to 12 , connection wires are provided at both ends of the metal heating sheet 21, and the connection wires are directly electrically connected to the mains voltage terminal of the control circuit board 10.

[0035] In the present utility model, as shown in Figure 5 and Figures 8 - 12As shown, the hollowed metal heating sheet 21 is formed by chemical etching and then bonded between a high-temperature resistant resin and a high-temperature resistant insulating film 22. The metal heating sheet 21 has a structure in which a single metal wire is evenly bent and densely arranged, or a structure in which at least two metal wires are evenly bent and densely arranged. The densely arranged structure of the bent metal wires in the metal heating sheet 21 can be any other diverse forms, not limited to the shapes shown in the present utility model. Only several forms are listed in the figure, which is not an exhaustive list.

[0036] As Figures 3 - 7 shown, the heating sheet assembly 20 further includes a high-temperature resistant transparent adhesive tape 23, a mounting bracket 24, and a heat conducting sheet 25. The heat conducting sheet 25 and the metal heating sheet 21 covered with the high-temperature resistant insulating film 22 are mounted on the mounting bracket 24. Temperature control switches 26 and temperature control switch fixing brackets 27, a thermistor 28, and a thermistor fixing bracket 29 are respectively provided on the left and right sides of the mounting bracket 24.

[0037] Both the temperature control switch 26 and the thermistor 28 are electrically connected to the heating sheet assembly 20. The temperature control switch 26 will automatically control the working time or heating power of the temperature control switch 26 according to the temperature data detected by the thermistor 28 to control the working temperature of the metal heating sheet 21, so as to achieve the purpose of accurate and timely temperature adjustment.

[0038] Both ends of the high-temperature resistant insulating film 22 are bent inwardly towards the bottom and extend with connecting pieces having mounting holes. Both ends of the high-temperature resistant transparent adhesive tape 23 are bent inwardly towards the bottom with bent edges. The high-temperature resistant transparent adhesive tape 23 and the high-temperature resistant insulating film 22 successively cover the upper surface and both ends of the metal heating sheet 21, the heat conducting sheet 25, and the mounting bracket 24. The connecting pieces at both ends of the high-temperature resistant insulating film 22 are fixed to the bottom of the mounting bracket 24.

[0039] In the present utility model, the width of the heat-sealing part of the vacuum sealer is 5 - 12 mm, the heating efficiency is above 150 W, the heat-sealing width is relatively wide, the heating efficiency is above 150 W, the heating efficiency is high, the sealing temperature during heating is 150 - 200 °C, the working temperature is relatively high, and the purpose of high-efficiency sealing in a short time can be achieved.

[0040] The present utility model is not limited to the above embodiments. If various modifications or variations of the present utility model do not depart from the spirit and scope of the present utility model, and if these modifications and variations fall within the scope of the claims of the present utility model and equivalent technical scope, then the present utility model also includes these modifications and variations.

Claims

1. A vacuum sealer, comprising a base and an upper cover, wherein the upper cover is movably hinged to one side of the base, a vacuum pump, a control circuit board and a power cord are arranged on the base, the vacuum pump is electrically connected to the control circuit board, and the fitting surfaces of the base and the upper cover are provided with upper and lower vacuum chambers at corresponding positions when the base and the upper cover are closed, and sealing rings are arranged around the upper vacuum chamber and the lower vacuum chamber respectively, a sealing heating sheet assembly electrically connected to the control circuit board is arranged on the front side of the base, and a heat sealing strip matched with the heating sheet assembly is arranged at a corresponding position on the front side of the upper cover, characterized in that: The heating plate assembly comprises a metal heating plate and a high temperature resistant insulating film covering the metal heating plate. The metal heating plate is hollowed out to form one or more continuous curled and densely arranged lines.

2. The vacuum sealer according to claim 1, characterized in that: The two ends of the metal heating plate are provided with connecting wires, and the connecting wires are directly electrically connected to the mains voltage end of the control circuit board.

3. The vacuum sealer according to claim 1, characterized in that: The hollowed-out metal heating sheet is processed by a chemical corrosion method and then bonded between a high-temperature resistant resin and a high-temperature resistant insulating film.

4. The vacuum sealer according to claim 3, characterized in that: The metal heating sheet is a structure in which a single metal wire is evenly bent and densely arranged.

5. The vacuum sealer according to claim 3, characterized in that: The metal heating sheet is a structure in which at least two metal wires are uniformly bent and densely arranged.

6. The vacuum sealer according to any one of claims 1 to 5, characterized in that: The heating plate assembly also includes high-temperature resistant transparent adhesive tape, a mounting bracket and a heat-conducting plate. The heat-conducting plate and the metal heating plate coated with a high-temperature resistant insulating film are installed on the mounting bracket. The left and right sides of the mounting bracket are respectively provided with a temperature control switch and a temperature control switch fixing bracket, a thermistor and a thermistor fixing bracket.

7. The vacuum sealer according to claim 6, characterized in that: The temperature control switch and the thermistor are both electrically connected to the heating device. The temperature control switch automatically controls the working time or heating power of the temperature control switch according to the temperature data detected by the thermistor to control the working temperature of the metal heating plate.

8. The vacuum sealer according to claim 6, characterized in that: The two ends of the high temperature resistant insulating film are bent toward the inside of the bottom, and a connecting piece with a mounting hole is extended inward. The two ends of the high temperature resistant transparent tape are bent toward the inside of the bottom with a bending edge. The high temperature resistant transparent tape and the high temperature resistant insulating film sequentially cover the metal heating plate, the heat conducting plate, and the upper surface and both ends of the mounting bracket. The connecting pieces at both ends of the high temperature resistant insulating film are fixed to the bottom of the mounting bracket.

9. The vacuum sealer according to claim 1, characterized in that: The width of the heat-generating seal of the vacuum sealer is 5-12 mm, the heat-generating efficiency is above 150 W, and the sealing temperature during heat generation is 150-200° C.

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