Dry-burning-resistant electric heating tube

Abstract

The utility model provides an anti-dry-burning electric heating tube which comprises a U-shaped electric heating tube, a junction box, a connecting plate, a U-shaped frame and a float switch, and the connecting plate is arranged at the end of an electrode of the U-shaped electric heating tube; when water in the heating box reaches the lowest limit, a floating body of the floating ball switch sinks to the bottom of the U-shaped frame, so that the floating ball switch is switched off, an electric heating loop of the U-shaped electric heating tube is switched off, the U-shaped electric heating tube is prevented from working when no water exists in the heating box, the service life of the U-shaped electric heating tube is prolonged, and the service life of the U-shaped electric heating tube is prolonged. Accidents caused by dry burning of the U-shaped electric heating tube are prevented; when the dry burning temperature reaches a certain value, the thermal fuse body can be automatically fused to disconnect the U-shaped electric heating tube of the electric heater from the main circuit, so that the heating action of the U-shaped electric heating tube is interrupted, and the dry burning problem of the electric heater is prevented. And the use safety of the electric heater is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of electric heating tubes, in particular to an anti-dry-burning electric heating tube. Background Art

[0002] Dry burning of the heater means that the heating tube of the electric heater is still powered for heating when there is no liquid or the liquid level is lower than the heating tube. The hazards of dry burning of the heater are as follows: it is easy to directly cause damage to the heater; it causes the failure of the heater sealing device, thereby causing the leakage of the medicine, causing more serious personal injury or casualties and property loss; it causes the liquid storage tank to burn, thereby causing the leakage of the medicine, causing more serious personal injury or casualties and property loss; it causes the electric heating tube to burn red, thereby causing a fire, causing more serious personal injury or casualties and property loss; when the heater is severely dry burning, it may cause the heater to leak due to insulation damage, which can easily cause dangerous accidents of electric shock.

[0003] Commonly used electric heaters on the market may be equipped with a so-called anti-dry-burn protection function. Its principle is to add a single-head sealed protection tube next to the electric heating tube, and place a temperature switch in the protection tube. It relies on the heat generated when the heater is dry-burned, and slowly radiates to the temperature switch in the protection tube. When the temperature exceeds the action value of the temperature switch, the temperature switch will send an over-temperature action signal of the switching quantity, and must rely on the connection of an external circuit to play a little protective role. The heater itself does not have a self-protection function. Therefore, improving an anti-dry-burn electric heating tube with a self-protection function has become an urgent problem to be solved. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the utility model provides an anti-dry-burning electric heating tube with a self-protection function.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] An anti-dry-burning electric heating tube, comprising a U-shaped electric heating tube, a junction box, a connecting plate, a U-shaped frame and a float switch;

[0009] The electrode end of the U-shaped electric heating tube is provided with the connecting plate;

[0010] The junction box is mounted on the connection plate;

[0011] The U-shaped frame is arranged at the bottom of the connecting plate;

[0012] The float of the float switch is slidably mounted in the U-shaped frame, and the float switch is connected in series to the electric heating circuit in the junction box.

[0013] Preferably, protrusions are provided on opposite sides of the float of the float switch, and guide rails corresponding to the protrusions are provided on opposite sides of the inner wall of the U-shaped frame.

[0014] Preferably, a thermal fuse is further included, which is arranged at the bottom of the C-shaped frame, connected to the junction box through an electric wire, and connected in series to the electric heating circuit in the junction box.

[0015] Preferably, the electric wires are buried in the U-shaped frame.

[0016] (3) Beneficial effects

[0017] The beneficial effects of the present invention are: by adopting the above technical scheme, when the water in the heating box reaches the lowest limit, the float of the float switch sinks to the bottom of the U-shaped frame, so that the float switch is disconnected, and then the electric heating circuit of the U-shaped electric heating tube is disconnected, avoiding the U-shaped electric heating tube from working when there is no water in the heating box, increasing the service life of the U-shaped electric heating tube, and preventing accidents caused by dry burning of the U-shaped electric heating tube; when the dry burning temperature reaches a certain value, the thermal fuse will automatically melt and disconnect the U-shaped electric heating tube of the electric heater from the main circuit, thereby interrupting the heating action of the U-shaped electric heating tube, thereby preventing the dry burning problem of the electric heater. The present application realizes double insurance against dry burning of the electric heater through the float switch and the thermal fuse, which greatly improves the safety of the use of the electric heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of an anti-dry-burning electric heating tube;

[0019] Figure 2 This is a schematic diagram of the main structure of an anti-dry-burning electric heating tube;

[0020] Figure 3 This is a circuit connection diagram of the utility model.

[0021] [Description of Reference Numerals]

[0022] 1. U-shaped electric heating tube;

[0023] 2. Connecting plate;

[0024] 3. Junction box;

[0025] 4. U-shaped frame;

[0026] 5. Float switch;

[0027] 6. Thermal link;

[0028] 7. Electrical wires. DETAILED DESCRIPTION

[0029] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0030] Please refer to Figures 1 to 3 The utility model provides an anti-dry-burning electric heating tube, comprising a U-shaped electric heating tube 1, a junction box 3, a connecting plate 2, a U-shaped frame 4 and a float switch 5;

[0031] The electrode end of the U-shaped electric heating tube 1 is provided with the connecting plate 2;

[0032] The junction box 3 is installed on the connecting plate 2;

[0033] The U-shaped frame 4 is arranged at the bottom of the connecting plate 2;

[0034] The float of the float switch 5 is slidably mounted in the U-shaped frame 4, and the float switch 5 is connected in series to the electric heating circuit in the junction box 3;

[0035] During use, when the water in the heating box reaches the lowest limit, the float of the float switch 5 sinks to the bottom of the U-shaped frame 4, causing the float switch 5 to be disconnected, thereby disconnecting the electric heating circuit of the U-shaped electric heating tube 1, avoiding the U-shaped electric heating tube 1 from working when there is no water in the heating box, increasing the service life of the U-shaped electric heating tube 1, and preventing accidents caused by dry burning of the U-shaped electric heating tube 1.

[0036] In this embodiment, protrusions are provided on both sides of the float of the float switch 5, and guide rails corresponding to the protrusions are provided on both sides of the inner wall of the U-shaped frame 4. The setting of the U-shaped frame 4 is used to protect the float of the float switch 5 from rising and falling inside it, and to isolate it from the U-shaped electric heating tube 1, which has a protective effect.

[0037] In this embodiment, a thermal fuse 6 is further included. The thermal fuse 6 is arranged at the bottom of the U-shaped frame 4. The thermal fuse 6 is connected to the junction box 3 through an electric wire 7 and is connected in series to the electric heating circuit in the junction box 3. When in use, when the dry-burning temperature reaches a certain value, the thermal fuse 6 will automatically melt and disconnect the U-shaped electric heating tube 1 of the electric heater from the main circuit, thereby interrupting the heating action of the U-shaped electric heating tube 1, thereby preventing the dry-burning problem of the electric heater.

[0038] In this embodiment, the electric wires 7 are buried in the U-shaped frame 4 .

[0039] The working principle of this utility model is as follows:

[0040] When the water in the heating box reaches the lowest limit, the float of the float switch 5 sinks to the bottom of the U-shaped frame 4, causing the float switch 5 to be disconnected, thereby disconnecting the electric heating circuit of the U-shaped electric heating tube 1, avoiding the U-shaped electric heating tube 1 from working when there is no water in the heating box, increasing the service life of the U-shaped electric heating tube 1, and preventing accidents caused by dry burning of the U-shaped electric heating tube 1; when the dry burning temperature reaches a certain value, the thermal fuse 6 will automatically melt and disconnect the U-shaped electric heating tube 1 of the electric heater from the main circuit, thereby interrupting the heating action of the U-shaped electric heating tube 1, thereby preventing the dry burning problem of the electric heater. The present application realizes double insurance against dry burning of the electric heater through the float switch 5 and the thermal fuse 6, which greatly improves the safety of the electric heater.

[0041] The circuits, electronic components and modules involved are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by this utility model does not involve improvements to software and methods.

[0042] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An anti-dry burning electric heating tube, characterized in that: Including U-shaped electric heating tube, junction box, connecting plate, thermal fuse, U-shaped frame and float switch; The electrode end of the U-shaped electric heating tube is provided with the connecting plate; The junction box is mounted on the connection plate; The U-shaped frame is arranged at the bottom of the connecting plate; The float of the float switch is slidably mounted in the U-shaped frame, and the float switch is connected in series to the electric heating circuit in the junction box; The thermal fuse is arranged at the bottom of the U-shaped frame, and the thermal fuse is connected to the junction box through an electric wire and is connected in series to the electric heating circuit in the junction box; The electric wires are embedded in the U-shaped frame.

2. The anti-dry-burning electric heating tube according to claim 1, characterized in that: Protrusions are relatively arranged on both sides of the float of the float switch, and guide rails corresponding to the protrusions are relatively arranged on both sides of the inner wall of the U-shaped frame.

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