A heating wire protection device of a vacuum sealer and a vacuum sealer
By employing an AC heating wire and a lid-closing detection circuit in the vacuum sealing machine to detect the lid-closing status of the vacuum chamber, the control module disconnects the power supply to the heating wire, thus solving the problems of high complexity of the control board and large power loss in the existing technology, achieving a more efficient sealing process and reduced costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG YINGKE ELECTRONICS
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-28
AI Technical Summary
The heating wire of existing vacuum sealing machines uses 12VDC direct current, which leads to complex control board design, high cost and large power loss, affecting service life and sealing efficiency.
An AC heating wire is used, and the vacuum chamber is closed by a micro switch and a lid-closing detection circuit. The control module disconnects the power supply to the heating wire. Combined with a small switching power supply and lid-closing detection drive, the risk of electric shock is avoided, sealing efficiency is improved and costs are reduced.
It enables rapid heating of AC heating wire, reduces equipment costs, reduces power loss, improves sealing efficiency, and eliminates the risk of electric shock.
Smart Images
Figure CN224562939U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum sealing machine technology, and in particular to a heating wire protection device for a vacuum sealing machine and a vacuum sealing machine. Background Technology
[0002] In existing technologies, the heating wires of vacuum sealing machines are basically low-voltage DC heating wires with a power of about 100W and a power of 12VDC. Based on this type of heating wire, the corresponding electronic control board needs to be designed with a 100W switching power supply to meet the driving requirements. At the same time, it is necessary to set up capacitors and inductor filters with sufficient capacity to eliminate electromagnetic interference. This leads to an increase in the design complexity of the electronic control board and an increase in cost. In addition, the high-power switching power supply will generate a certain amount of heat during operation, resulting in a certain amount of power loss, which affects the service life and sealing efficiency of the vacuum sealing machine. Utility Model Content
[0003] The purpose of this utility model is to provide a heating wire protection device for a vacuum sealing machine and a vacuum sealing machine, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.
[0004] To achieve the above objectives, some embodiments of this application provide a heating wire protection device for a vacuum sealing machine. The vacuum sealing machine is equipped with a vacuum chamber. The device includes: an AC interface terminal, a micro switch, a lid-closing detection circuit, a drive circuit, a heating wire, and a control module.
[0005] The micro switch is disposed on the lid of the vacuum chamber, the input terminal of the lid detection circuit is connected to the micro switch, and the output terminal of the lid detection circuit is connected to the input terminal of the control module.
[0006] The input terminal of the drive circuit is connected to the output terminal of the control module, and the output terminal of the drive circuit is connected to the AC interface terminal and the heating wire respectively. The heating wire is in contact with the target to be drawn.
[0007] The micro switch is used to detect the open state of the vacuum chamber lid, and the lid detection circuit is used to output an open signal to the control module when it is determined that the vacuum chamber lid is open.
[0008] The control module is used to receive the lid opening signal and output a cutoff signal to the drive circuit.
[0009] The drive circuit is used to receive the cutoff signal and disconnect the AC interface terminal and the heating wire.
[0010] Furthermore, the device also includes: a vacuum pump and a vacuum sensor;
[0011] The vacuum pump is connected to the vacuum chamber, the vacuum sensor is located at the lid of the vacuum chamber, and both the vacuum sensor and the vacuum pump are connected to the control module.
[0012] The vacuum pump is used to evacuate the target to be evacuated, and the vacuum sensor is used to detect the vacuum level of the target to be evacuated located at the closed end of the vacuum chamber.
[0013] Furthermore, the device also includes: a switching power supply circuit;
[0014] The input terminal of the switching power supply circuit is connected to the AC interface terminal, and the output terminal of the switching power supply circuit is connected to the micro switch, the lid detection circuit, and the drive circuit respectively. The switching power supply circuit is used to output the corresponding drive voltage to the micro switch, the lid detection circuit, and the drive circuit.
[0015] Furthermore, the driving circuit includes: a first switching circuit and a second switching circuit;
[0016] The input terminal of the first switching circuit is connected to the output terminal of the control module, and the output terminal of the first switching circuit is connected to the AC interface terminal and one end of the heating wire, respectively.
[0017] The input terminal of the second switching circuit is connected to the output terminal of the control module, and the output terminal of the second switching circuit is connected to the AC interface terminal and the other end of the heating wire, respectively.
[0018] Furthermore, the device also includes: a vacuum adjustment knob and a vacuum pump adjustment circuit;
[0019] The vacuum adjustment knob is located on the vacuum sealing machine. Both the vacuum adjustment knob and the input terminal of the vacuum pump adjustment circuit are connected to the control module. The output terminal of the vacuum pump adjustment circuit is connected to the vacuum pump. The vacuum pump adjustment circuit is used to adjust the operating frequency of the vacuum pump.
[0020] Furthermore, the cover-closing detection circuit includes: a pull-up resistor and a transistor amplifier circuit;
[0021] The pull-up resistors are connected to the input terminal of the transistor amplifier circuit and the micro switch, respectively, and the output terminal of the transistor amplifier circuit is connected to the input terminal of the control module.
[0022] Furthermore, the first switching circuit includes: a first transistor and a first relay;
[0023] The base of the first transistor is connected to the output terminal of the control module, the collector of the first transistor is connected to the drive coil of the first relay, the emitter of the first transistor is connected to ground, and the switch of the first relay is connected to the AC interface terminal and one end of the heating wire, respectively.
[0024] Furthermore, the second switching circuit includes: a second transistor and a second relay;
[0025] The base of the second transistor is connected to the output terminal of the control module, the collector of the second transistor is connected to the drive coil of the second relay, the emitter of the second transistor is connected to ground, and the switch of the second relay is connected to the AC interface terminal and the other end of the heating wire, respectively.
[0026] Furthermore, the device also includes a current fuse; the current fuse is connected to the switch of the second relay and the other end of the heating wire, respectively.
[0027] Some embodiments of this application provide a vacuum sealing machine, including a heating wire protection device for the vacuum sealing machine.
[0028] The beneficial effects of this invention are as follows: A microswitch and a lid-closing detection circuit detect whether the vacuum chamber lid is closed. When the lid is confirmed to be open, the control module and drive circuit disconnect the AC interface from the heating wire. Opening the lid directly cuts off the relay power supply, avoiding the risk of electric shock from exposed heating wire and solving the problem of electric shock from high-voltage controlled heating wires. Furthermore, the heating wire operating on AC power significantly increases heating speed compared to DC heating wires, thereby improving sealing efficiency. Compared to AC heating wires, which can directly utilize mains power, only a small switching power supply is needed, greatly reducing equipment costs and minimizing power loss and heat generation. Attached Figure Description
[0029] Figure 1 This is a circuit diagram of a heating wire protection device for a vacuum sealing machine according to an embodiment of the present invention;
[0030] Figure 2 This is a schematic diagram of the frame of a heating wire protection device for a vacuum sealing machine according to an embodiment of the present invention;
[0031] Figure 3 This is a schematic diagram of the installation structure of a heating wire protection device for a vacuum sealing machine, provided in one embodiment of the present invention. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of this invention.
[0033] It should be noted that although functional modules are divided in the diagram, in some cases, the modules can be divided differently from those in the system.
[0034] Furthermore, it is understood that the terms "first," "second," etc., used in this application may be used herein to describe various concepts, but unless specifically stated otherwise, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more features. For example, without departing from the scope of embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words "if" or "when" as used herein may be interpreted as "in the event of," "when," or "in response to a determination."
[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0036] As described in the background section, in the prior art, the heating wire of the vacuum sealing machine is basically a low-voltage DC heating wire with a power of about 100W and a DC power of 12VDC. Based on this type of heating wire, the corresponding electronic control board needs to be designed with a 100W switching power supply to meet the driving requirements. At the same time, it is necessary to set up capacitors and inductors with sufficient capacity to eliminate electromagnetic interference. This leads to an increase in the design complexity of the electronic control board and an increase in cost. In addition, the high-power switching power supply will generate a certain amount of heat during operation, resulting in a certain amount of power loss, which affects the service life and sealing efficiency of the vacuum sealing machine.
[0037] The operating principle of the vacuum sealing machine 600 is as follows: place the vacuum material into the vacuum bag, close the vacuum chamber, select the working mode, extract the air from the packaging bag, and when the packaging bag is in a vacuum state, heat the packaging material to melt it and form a seal.
[0038] Reference Figure 1 , Figure 2 and Figure 3In some embodiments of this utility model, a heating wire protection device for a vacuum sealing machine 600 includes: an AC interface terminal, a micro switch 100, a lid closing detection circuit 200, a drive circuit 300, a heating wire 400, and a control module 500.
[0039] A micro switch 100 is installed on the lid 610 of the vacuum chamber. The packaging bag is placed below the lid 610 of the vacuum chamber. The micro switch 100 is electrically connected to the input terminal of the lid detection circuit 200, and the output terminal of the lid detection circuit 200 is electrically connected to the input terminal of the control module 500.
[0040] The output terminal of the control module 500 is electrically connected to the input terminal of the drive circuit 300. The heating wire 400 is in contact with the target to be drawn. The output terminal of the drive circuit 300 is electrically connected to the AC interface terminal. The output terminal of the drive circuit 300 is also electrically connected to the heating wire 400.
[0041] The microswitch 100 can detect whether the vacuum chamber lid 610 is open. When the vacuum chamber lid 610 is open (i.e., in the open state), the microswitch 100 sends a low-level signal to the lid detection circuit 200. When the vacuum chamber lid 610 is closed (i.e., in the closed state), the microswitch 100 sends a high-level signal to the lid detection circuit 200.
[0042] In one embodiment, when it is determined that the lid 610 of the vacuum chamber is open, i.e. in the open state, the micro switch 100 sends a low-level signal to the lid detection circuit 200. The lid detection circuit 200 can receive the low-level signal and thus outputs an open signal to the control module 500.
[0043] When the vacuum chamber lid 610 is confirmed to be open (i.e., in the open state), the microswitch 100 sends a low-level signal to the lid detection circuit 200. The lid detection circuit 200 receives this low-level signal and outputs an open-lid signal to the control module 500. The control module 500 receives this open-lid signal and, based on it, outputs a cutoff signal to the drive circuit 300. The drive circuit 300, based on this cutoff signal, disconnects the heating wire 400 from the AC interface terminal to cut off the power supply to the heating wire 400. The cutoff signal is a low-level signal.
[0044] In one embodiment, when it is determined that the lid 610 of the vacuum chamber is closed, i.e. in a closed state, the micro switch 100 sends a high-level signal to the lid detection circuit 200. The lid detection circuit 200 can receive the high-level signal and thus output a lid-closing signal to the control module 500.
[0045] When the vacuum chamber lid 610 is confirmed to be closed (i.e., in the closed state), the microswitch 100 sends a high-level signal to the lid detection circuit 200. The lid detection circuit 200 receives this high-level signal and outputs a lid-closing signal to the control module 500. The control module 500 receives this lid-closing signal and, based on it, outputs a conduction signal to the drive circuit 300. The drive circuit 300, based on this conduction signal, connects the heating wire 400 to the AC interface terminal, supplying power to the heating wire 400. The conduction signal is a high-level signal.
[0046] Reference Figure 2 and Figure 3 In some embodiments of this application, the heating wire protection device further includes: a vacuum pump 620, a vacuum sensor 630, and a vacuum pump adjustment circuit.
[0047] A vacuum pump 620 is installed in the vacuum chamber, and the vacuum chamber is connected to the vacuum pump 620. The vacuum pump 620 is electrically connected to the output terminal of the control module 500 through the vacuum pump adjustment circuit. That is, the vacuum pump 620 is electrically connected to the output terminal of the control module 500, and the vacuum pump adjustment circuit is also electrically connected to the output terminal of the control module 500.
[0048] The vacuum pump adjustment circuit can adjust the vacuum pump 620 to regulate the operating frequency of the vacuum pump 620 for vacuuming. The vacuum pump 620 can evacuate the target to be vacuumed and remove the air from the packaging bag.
[0049] A vacuum sensor 630 is installed at the cover 610 of the vacuum chamber. The input terminal of the vacuum sensor 630 is electrically connected to the output terminal of the control module 500. The vacuum sensor 630 can detect the vacuum level of the target to be evacuated at the cover 610 of the vacuum chamber.
[0050] In one embodiment, in response to the triggering of the vacuum adjustment knob 640, the current operating mode is determined, and the target vacuum level is determined based on the current operating mode. The vacuum adjustment knob 640 performs analog-to-digital conversion and sends the target vacuum level to the control module 500. The control module 500 sends an adjustment signal to the vacuum pump adjustment circuit based on the target vacuum level. The vacuum pump adjustment circuit adjusts the operating frequency of the vacuum pump 620, and the vacuum pump 620 evacuates the target to be vacuumed, removing the air from the packaging bag.
[0051] In one embodiment, the vacuum sensor 630 detects the vacuum level and compares it with the target vacuum level. When the vacuum level reaches the target vacuum level, the control module 500 controls the heating wire 400 to start working, heating the target to be extracted, so that the packaging material of the target to be extracted melts and forms a seal.
[0052] The vacuum sensor 630 can be an HM27A vacuum pressure sensor or other types of sensors, which will not be described in detail in this application.
[0053] Reference Figure 1 , Figure 2 and Figure 3 In some embodiments of this application, the heating wire protection device further includes: a switching power supply circuit, a vacuum adjustment knob 640, and a current fuse F1.
[0054] One end of the current fuse F1 is electrically connected to the other end of the heating wire 400, and the other end of the current fuse F1 is electrically connected to the switch of the second relay K2 of the second switching circuit of the drive circuit 300.
[0055] The current fuse F1 can operate with the heating wire 400, but when a short circuit occurs in the device, it disconnects the AC interface from the heating wire 400.
[0056] The vacuum adjustment knob 640 is set to vacuum. The vacuum adjustment knob 640 is electrically connected to the input terminal of the control module 500. The vacuum adjustment knob 640 can respond to the user's trigger and send the target vacuum level to the control module 500.
[0057] The input terminal of the switching power supply circuit is electrically connected to the AC interface terminal, and the output terminal of the switching power supply circuit is connected to the micro switch 100, the lid detection circuit 200, and the drive circuit 300. The switching power supply circuit can output the corresponding drive voltage to the micro switch 100, the lid detection circuit 200, and the drive circuit 300.
[0058] Based on the AC heating wire 400, a 100W switching power supply can be converted into a 5W switching power supply, saving a series of filtering components and greatly reducing costs. In addition, based on the AC heating wire 400, the method of using the cover 610 to detect and drive the power supply of the heating wire 400 is adopted to avoid the problem of electric shock from the AC heating wire 400 and to achieve isolation when the heating wire 400 is not in operation.
[0059] Reference Figure 1 , Figure 2 and Figure 3 In some embodiments of this application, the driving circuit 300 includes: a first switching circuit and a second switching circuit.
[0060] The input terminal of the first switching circuit is electrically connected to the output terminal of the control module 500, the output terminal of the first switching circuit is electrically connected to one end of the heating wire 400, and the output terminal of the first switching circuit is also electrically connected to the AC interface terminal.
[0061] The input terminal of the second switching circuit is electrically connected to the output terminal of the control module 500, the output terminal of the second switching circuit is electrically connected to the other end of the heating wire 400, and the output terminal of the second switching circuit is also electrically connected to the AC interface terminal.
[0062] The first switching circuit includes: a first transistor Q1, a first diode D1, and a first relay K1.
[0063] The base of the first transistor Q1 is electrically connected to the output terminal of the control module 500. The collector of the first transistor Q1 is electrically connected to the anode of the first diode D1 and the drive coil of the first relay K1, respectively. The cathode of the first diode D1 is electrically connected to the switching power supply circuit. The drive coil of the first relay K1 is also electrically connected to the switching power supply circuit. That is, the first diode D1 and the drive coil of the first relay K1 are connected in parallel.
[0064] The emitter of the first transistor Q1 is connected to ground. One end of the switch of the first relay K1 is electrically connected to the AC interface terminal, and the other end of the switch of the first relay K1 is electrically connected to one end of the heating wire 400.
[0065] The second switching circuit includes: a second transistor Q2, a second diode D2, and a second relay K2.
[0066] The base of the second transistor Q2 is electrically connected to the output terminal of the control module 500. The collector of the second transistor Q2 is electrically connected to the anode of the second diode D2 and the drive coil of the second relay K2. The cathode of the second diode D2 is electrically connected to the switching power supply circuit. The drive coil of the second relay K2 is also electrically connected to the switching power supply circuit. That is, the second diode D2 and the drive coil of the second relay K2 are connected in parallel.
[0067] The emitter of the second transistor Q2 is connected to ground. One end of the switch of the second relay K2 is electrically connected to the AC interface terminal, and the other end of the switch of the second relay K2 is electrically connected to the other end of the heating wire 400.
[0068] Reference Figure 1 , Figure 2 and Figure 3 In some embodiments of this application, the cover detection circuit 200 includes a pull-up resistor R1 and a transistor amplifier circuit.
[0069] One end of the pull-up resistor R1 is electrically connected to the input terminal of the transistor amplifier circuit, and the other end of the pull-up resistor R1 is electrically connected to the micro switch 100. The output terminal of the transistor amplifier circuit is connected to the input terminal of the control module 500.
[0070] The transistor amplifier circuit includes: a third transistor Q3, a first capacitor C1, a second capacitor C2, a pull-down resistor R2, a pull-up power supply resistor R3, and a current-limiting resistor R4.
[0071] The collector of the third transistor Q3 is electrically connected to the switching power supply circuit through a pull-up resistor R3. The collector of the third transistor Q3 is electrically connected to the input terminal of the control module 500 through a current-limiting resistor R4. The base of the third transistor Q3 is electrically connected to the micro switch 100 through a pull-up resistor R1. The base of the third transistor Q3 is grounded through a first capacitor C1 and a pull-down resistor R2. One end of the second capacitor C2 is electrically connected to both the current-limiting resistor R4 and the input terminal of the control module 500, while the other end of the second capacitor C2 is grounded. The emitter of the third transistor Q3 is connected to ground.
[0072] Reference Figure 3 In some embodiments of another aspect of this application, a vacuum sealing machine 600 includes a heating wire protection device as described in some embodiments of another aspect of this application.
[0073] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A heating wire protection device for a vacuum sealer, characterized by, The vacuum sealing machine is equipped with a vacuum chamber, and the device includes: an AC interface terminal, a micro switch, a lid closing detection circuit, a drive circuit, a heating wire, and a control module; The micro switch is disposed on the lid of the vacuum chamber, the input terminal of the lid detection circuit is connected to the micro switch, and the output terminal of the lid detection circuit is connected to the input terminal of the control module. The input terminal of the drive circuit is connected to the output terminal of the control module, and the output terminal of the drive circuit is connected to the AC interface terminal and the heating wire respectively. The heating wire is in contact with the target to be drawn. The micro switch is used to detect the open state of the vacuum chamber lid, and the lid detection circuit is used to output an open signal to the control module when it is determined that the vacuum chamber lid is open. The control module is used to receive the lid opening signal and output a cutoff signal to the drive circuit. The drive circuit is used to receive the cutoff signal and disconnect the AC interface terminal and the heating wire.
2. The heating element protection arrangement of claim 1, wherein The device also includes: a vacuum pump and a vacuum sensor; The vacuum pump is connected to the vacuum chamber, the vacuum sensor is located at the lid of the vacuum chamber, and both the vacuum sensor and the vacuum pump are connected to the control module. The vacuum pump is used to evacuate the target to be evacuated, and the vacuum sensor is used to detect the vacuum level of the target to be evacuated located at the closed end of the vacuum chamber.
3. The heating wire protection device according to claim 1, characterized in that, The device further includes: a switching power supply circuit; The input terminal of the switching power supply circuit is connected to the AC interface terminal, and the output terminal of the switching power supply circuit is connected to the micro switch, the lid detection circuit, and the drive circuit respectively. The switching power supply circuit is used to output the corresponding drive voltage to the micro switch, the lid detection circuit, and the drive circuit.
4. The heating wire protection device according to claim 1, characterized in that, The driving circuit includes: a first switching circuit and a second switching circuit; The input terminal of the first switching circuit is connected to the output terminal of the control module, and the output terminal of the first switching circuit is connected to the AC interface terminal and one end of the heating wire, respectively. The input terminal of the second switching circuit is connected to the output terminal of the control module, and the output terminal of the second switching circuit is connected to the AC interface terminal and the other end of the heating wire, respectively.
5. The heating wire protection device according to claim 2, characterized in that, The device also includes: a vacuum adjustment knob and a vacuum pump adjustment circuit; The vacuum adjustment knob is located on the vacuum sealing machine. Both the vacuum adjustment knob and the input terminal of the vacuum pump adjustment circuit are connected to the control module. The output terminal of the vacuum pump adjustment circuit is connected to the vacuum pump. The vacuum pump adjustment circuit is used to adjust the operating frequency of the vacuum pump.
6. The heating wire protection device according to claim 1, characterized in that, The lid-close detection circuit includes: a pull-up resistor and a transistor amplifier circuit; The pull-up resistors are connected to the input terminal of the transistor amplifier circuit and the micro switch, respectively, and the output terminal of the transistor amplifier circuit is connected to the input terminal of the control module.
7. The heating wire protection device according to claim 4, characterized in that, The first switching circuit includes: a first transistor and a first relay; The base of the first transistor is connected to the output terminal of the control module, the collector of the first transistor is connected to the drive coil of the first relay, the emitter of the first transistor is connected to ground, and the switch of the first relay is connected to the AC interface terminal and one end of the heating wire, respectively.
8. The heating wire protection device according to claim 4, characterized in that, The second switching circuit includes: a second transistor and a second relay; The base of the second transistor is connected to the output terminal of the control module, the collector of the second transistor is connected to the drive coil of the second relay, the emitter of the second transistor is connected to ground, and the switch of the second relay is connected to the AC interface terminal and the other end of the heating wire, respectively.
9. The heating wire protection device according to claim 8, characterized in that, The device further includes: A current fuse; the current fuse is connected to the switch of the second relay and the other end of the heating wire, respectively.
10. A vacuum sealing machine, characterized in that, Includes the heating wire protection device as described in any one of claims 1 to 9.