An electric heating bag
By using a microswitch to sense pressure changes and control the heating device in the electric hand warmer, the problem of easy damage to the thermostat is solved, and the safety and waterproof performance of the electric hand warmer are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 李洪旺
- Filing Date
- 2024-05-29
- Publication Date
- 2026-07-31
AI Technical Summary
Existing electric hand warmers require the thermostat to be in direct contact with the liquid to ensure accurate temperature measurement, but they are easily damaged and difficult to replace, affecting safety during use.
A microswitch is used to sense pressure changes inside the insulated bag. The heating device is turned on and off by the action zone abutting against the microswitch, avoiding direct contact between the microswitch and the medium. The bottom of the charging base is designed as a one-piece injection molded shell to facilitate manufacturing and improve waterproof performance.
It features a durable temperature control function, improving the safety and waterproof performance of the electric hand warmer.
Smart Images
Figure CN224580340U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an electric heating bag. Background Technology
[0002] For safety, existing electric hand warmers typically include a fuse and a thermostat. The thermostat detects the temperature of the liquid inside the warmer and disconnects the circuit when the liquid reaches a preset temperature, stopping the heating process and preventing the liquid temperature from rising further, which could lead to excessive internal pressure and bursting. However, the thermostat needs to be in direct contact with the liquid to ensure accurate temperature measurement, making it prone to damage and difficult to replace. Utility Model Content
[0003] The purpose of this invention is to provide a safe electric heating bag.
[0004] The purpose of this utility model is achieved as follows.
[0005] An electric hand warmer includes an insulated bag body, a heating device, and a charging base. The insulated bag body is filled with a medium and has gaps. The heating device is placed inside the medium within the insulated bag body. The charging base is located on top of the insulated bag body, with its upper part outside the insulated bag body and its lower part inside the insulated bag body, electrically connected to the heating device. A sealed electrical cavity is provided inside the lower part of the charging base, and a microswitch connected in series with the heating device is installed within the electrical cavity. An actuating area is formed on one side wall of the lower part of the charging base, and the actuating terminal of the microswitch abuts against the actuating area. When the heating device heats the heating medium, the pressure inside the insulation bag increases. The heating medium then pushes the actuating zone into the electrical cavity. This actuating zone triggers a microswitch, which stops the heating device from working. When the pressure inside the insulation bag decreases, the medium stops squeezing the action zone, and the action zone and micro switch reset.
[0006] The above technical solution can be further improved as follows.
[0007] Furthermore, a charging plug is installed inside the upper part of the charging base. The charging plug, heating device, and micro switch are connected in series. The charging plug is connected to the mains power to supply power to the heating device.
[0008] Furthermore, the charging base is equipped with a fuse, which is connected in series with the charging plug, heating device and micro switch. The fuse improves the safety of the product.
[0009] Furthermore, the lower part of the charging base includes a one-piece injection-molded bottom shell, the top surface of which is sealed to the inner wall of the insulated bag. An annular groove is provided on one outer side of the bottom shell, and the area within the annular groove forms the actuation zone, which moves relative to the bottom shell in the inward and outward directions. The lower part of the charging base is simple to manufacture, the actuation zone is easy to mold, and it has high waterproof performance. The annular groove thins the wall thickness at the connection between the bottom shell and the actuation zone, allowing the actuation zone to move.
[0010] Furthermore, the lower part of the charging base includes an integrally injection-molded bottom shell, the top surface of which is sealed to the inner wall of the insulated bag. One side wall of the bottom shell is flexible relative to the bottom shell to form the actuation zone, which moves in the inward and outward directions relative to the bottom shell. By designing the wall thickness of the actuation zone to be less than the wall thickness of the bottom shell, the actuation zone, like a thin film, can elastically deform inward and outward.
[0011] Compared to existing electric hand warmers, this invention uses a microswitch to sense the pressure inside the warming bag to control the circuit's on / off state. The microswitch does not directly contact the medium, making it less prone to damage and safer to use. The lower part of the charging base is simple to manufacture, the actuating area is easy to form, and it has high waterproof performance. Attached Figure Description
[0012] Figure 1 This is a cross-sectional structural diagram of Example 1.
[0013] Figure 2 This is a schematic diagram of the charging dock.
[0014] Figure 3 This is the circuit diagram for Example 1. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0016] Example 1, see Figure 1-3 As shown, an electric hand warmer includes an insulated bag body 1, a heating device 2, and a charging base 3. The interior of the insulated bag body 1 is filled with a medium 4 and has gaps 5. The heating device 2 is placed inside the medium 4 within the insulated bag body 1. The medium 4 is generally water.
[0017] The charging base 3 is located on top of the insulated bag body 1. The upper part of the charging base 3 is outside the insulated bag body 1, and the lower part of the charging base 3 is inside the insulated bag body 1 and electrically connected to the heating device 2. A sealed electrical cavity 6 is provided inside the lower part of the charging base 3. A micro switch 7 connected in series with the heating device 2 is located in the electrical cavity 6. An actuating area 81 is formed on one side wall of the lower part of the charging base 3, and the actuating end of the micro switch 7 abuts against the actuating area 81. A charging plug 31 is located inside the upper part of the charging base 3. A fuse 9 is also provided inside the charging base 3. The fuse 9, charging plug 31, heating device 2, and micro switch 7 are connected in series. The micro switch 7 is a self-resetting switch and remains normally closed. The upper and lower parts of the charging base 3 are connected.
[0018] In this embodiment, the lower part of the charging base 3 includes an integrally injection-molded bottom shell 8. The top surface of the bottom shell 8 is sealed to the inner wall of the insulated bag body 1. An annular groove 82 is provided on the outer side of one side of the bottom shell 8. The area within the annular groove 82 forms the action area 81, which moves relative to the bottom shell 8 in the inward and outward directions. Alternatively, the side wall of one side of the bottom shell 8 can be flexible relative to the bottom shell 8 to form the action area 81 (the wall thickness of the action area 81 is less than the wall thickness of the bottom shell 8), and the action area 81 moves relative to the bottom shell 8 in the inward and outward directions (the action area 81 has a certain elastic deformation space).
Claims
1. An electric hand warmer, comprising an insulated bag body (1), a heating device (2), and a charging base (3), wherein the interior of the insulated bag body (1) is filled with a medium (4) and has gaps (5), and the heating device (2) is placed in the medium (4) inside the insulated bag body (1), characterized in that, The charging base (3) is located on the top of the insulated bag body (1). The upper part of the charging base (3) is placed outside the insulated bag body (1), and the lower part of the charging base (3) is placed inside the insulated bag body (1) and electrically connected to the heating device (2). A sealed electrical cavity (6) is provided in the lower part of the charging base (3). A micro switch (7) connected in series with the heating device (2) is provided in the electrical cavity (6). An action area (81) is formed on one side wall of the lower part of the charging base (3). The action end of the micro switch (7) abuts against the action area (81). When the heating device (2) heats the medium (4), the pressure inside the heat-insulating bag (1) increases. The medium (4) will squeeze the action zone (81) into the electrical cavity (6). The action zone (81) will trigger the micro switch (7), and the micro switch (7) will stop the heating device (2) from working. When the pressure inside the heat-insulating bag (1) drops, the medium (4) stops squeezing the action zone (81), and the action zone (81) and the micro switch (7) are reset.
2. The electric bag of claim 1, wherein The upper part of the charging base (3) is equipped with a charging plug (31), and the charging plug (31), heating device (2) and micro switch (7) are connected in series.
3. The electric bag of claim 2, wherein, The charging base (3) is also equipped with a fuse (9), and the fuse (9), charging plug (31), heating device (2) and micro switch (7) are connected in series.
4. The electric bag of claim 1, wherein The lower part of the charging base (3) includes an integrally injection molded bottom shell (8). The top surface of the bottom shell (8) and the inner wall of the heat preservation bag body (1) are sealed together. An annular groove (82) is provided on the outer side of one side of the bottom shell (8). The area inside the annular groove (82) forms the action area (81). The action area (81) moves relative to the bottom shell (8) in the inward and outward directions.
5. The electric heating bag according to claim 1, characterized in that The lower part of the charging base (3) includes an integrally injection-molded bottom shell (8), the top surface of the bottom shell (8) and the inner wall of the heat preservation bag body (1) are sealed together, and one side wall of the bottom shell (8) is flexible relative to the bottom shell (8) to form the action area (81), which moves relative to the bottom shell (8) in the inward and outward directions.