Dry burning prevention protection device of electric heating rod

Abstract

The utility model discloses an anti-dry burning protection device of an electric heating rod, which triggers a disconnecting mechanism by using the principle that nitrogen expands after being heated, if liquid exists around during working, the liquid can dissipate heat in time, and the temperature of nitrogen in a mounting cavity is stable; once dry burning occurs, the temperature of the heating rod rises sharply, nitrogen expands rapidly, the piston is pushed to separate the conducting ring from the metal column, a circuit is cut off, the physical protection mode is scientific and reliable, response is fast, and loss can be stopped in time at the initial stage of dry burning. When the piston cuts off a circuit, the triangular lock block can be clamped into the triangular lock groove of the piston to lock the piston, accidental electrification caused by automatic reset of the piston due to temperature fluctuation is prevented, and safety after dry burning is guaranteed. In addition, the device is further provided with a manual reset structure, a T-shaped pull rod is pulled, a movable rod is driven through the magnetic force of a magnetic strip and a conical magnetic block, a triangular locking block is disengaged, locking is relieved, a piston is reset under the action of a first spring, a circuit is recovered, parts do not need to be replaced, and cost and maintenance difficulty are reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric heating equipment technology, and more specifically, to an anti-dry-burning protection device for an electric heating rod. Background Technology

[0002] Electric heating elements, as a common heating device, are widely used in various liquid heating scenarios, such as water heaters and aquariums. However, during use, due to various reasons, such as liquid leakage or water level drop, electric heating elements may dry-burn. Dry-burning causes the heating element's temperature to rise sharply, which not only shortens its lifespan but may also cause fires and other safety accidents. Statistics show that fires caused by dry-burning electric heating elements occur frequently in homes and industrial sites, posing a serious threat to people's lives and property. Therefore, designing a reliable dry-burning protection device for electric heating elements is of significant practical importance.

[0003] The shortcomings of the existing device are: the electric heating rod of the existing device cannot cut off the circuit in time and effectively when it is dry-burning, and it is easy to be damaged due to prolonged dry burning, which increases the cost of equipment maintenance and replacement. At the same time, it has poor resistance to temperature fluctuations, and may accidentally restore power when the temperature fluctuates, which cannot guarantee the safety after dry burning. There is a risk of dry burning again or causing other safety hazards. In addition, after the dry burning protection action is activated, parts need to be replaced to restore use, which increases the cost of use and maintenance difficulty. Utility Model Content

[0004] The purpose of this invention is to provide a dry-burn protection device for an electric heating rod to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dry-burn protection device for an electric heating rod, comprising a mounting base, wherein a heating rod is installed through and fixedly mounted inside the mounting base, and multiple sets of heating wires are inserted inside the heating rod. A disconnecting mechanism is installed inside the mounting base, the disconnecting mechanism comprising a pair of mounting cavities opened inside the mounting base, the mounting cavities being filled with nitrogen gas, a metal column fixedly mounted on the side wall of the mounting cavity and connected to the heating wires, a conductive ring being sleeved on the metal column, and a conductive rod being fixedly mounted at one end of each pair of conductive rings, the end of the conductive rod being slidably connected to a conductive groove opened inside the mounting cavity, and positive and negative electrodes being embedded at the bottom of the pair of conductive grooves respectively.

[0006] As a preferred technical solution of this utility model, a connecting rod is fixedly installed on the side away from one end of each pair of conductive rings, and a piston is fixedly connected to the other end of the connecting rod. A sliding hole is opened in the mounting seat and communicates with the mounting cavity. The piston is slidably connected to the sliding hole. An air hole is opened through the inner end of the sliding hole and extends out of the mounting seat. A first spring is fixedly connected between the piston and the inner end of the sliding hole.

[0007] As a preferred technical solution of this utility model, a movable hole is provided at one end of each pair of sliding holes, a movable rod is slidably connected in the movable hole, a locking hole is provided at one end of the movable rod in the sliding hole, a triangular locking block is slidably connected in the locking hole, a second spring is fixedly connected between the triangular locking block and the inner end of the locking hole, and the triangular locking block engages with the triangular locking groove provided at the piston side end.

[0008] As a preferred embodiment of this utility model, the two movable holes are connected to the operating hole at their adjacent ends. A T-shaped pull rod is slidably connected inside the operating hole. A conical magnetic block is fixedly installed at the adjacent ends of the two movable rods. The end of the T-shaped pull rod is conical and a magnetic strip is fixedly installed inside. A reset cavity is opened inside the operating hole. A retaining ring is fixedly installed at the reset cavity on the T-shaped pull rod. A third spring is fixedly connected between the side wall of the retaining ring and the side wall of the reset cavity.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] (1) This device utilizes the principle of nitrogen expansion upon heating to trigger the disconnection mechanism. When the electric heating rod is in normal working condition and there is liquid (such as water) around it, the liquid can carry away the heat in time, and the temperature of the nitrogen in the mounting cavity is relatively stable. However, once dry burning occurs, there is no liquid around the heating rod to dissipate heat, the temperature rises sharply, the nitrogen in the mounting cavity expands rapidly upon heating, pushing the piston to move, which in turn causes the conductive ring to separate from the metal column, cutting off the circuit of the heating wire, effectively preventing the electric heating rod from being damaged due to dry burning. This protection method based on physical principles is scientific and reliable. Moreover, the thermal expansion response speed of the gas is relatively fast, and it can react quickly in the early stage of dry burning of the electric heating rod, when the temperature just shows an abnormal rise, and cut off the circuit in time, minimizing the damage caused by dry burning.

[0011] (2) When the piston moves and cuts off the circuit under the expansion of nitrogen, the triangular locking block will engage with the triangular locking groove at the end of the piston to lock the position of the piston. In this way, even if the temperature drops and the nitrogen contracts, the piston will not automatically reset due to the action of the first spring, avoiding accidental power restoration due to temperature fluctuations, further ensuring the safety of the electric heating rod after dry burning, and preventing dry burning from happening again or causing other safety hazards.

[0012] (3) This device is designed with a manual reset mechanism. By pulling the T-shaped lever, the magnetic attraction between the magnetic strip and the conical magnetic block causes the conical magnetic block and the moving rod to move, causing the triangular locking block to disengage from the triangular locking groove and release the piston. At this time, under the action of the first spring, the piston can be reset, the conductive ring re-contacts the metal column, the circuit is restored, and the electric heating rod can be used normally again. This resettable design allows the device to be put back into use after one anti-dry-burning protection action without replacing parts, requiring only simple operation, thus reducing the cost of use and the difficulty of maintenance. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall cross-section of an anti-dry-burning protection device for an electric heating rod according to an embodiment of the present utility model;

[0015] Figure 2 According to this utility model Figure 1 Schematic diagram of the structure at point A;

[0016] Figure 3 According to this utility model Figure 1 Schematic diagram of the structure at point B;

[0017] Figure 4 According to this utility model Figure 1 A schematic diagram of the structure at point C.

[0018] Figure label:

[0019] 1. Mounting base; 2. Heating rod; 3. Heating wire; 4. Disconnecting mechanism; 5. Mounting cavity; 6. Metal column; 7. Conductive ring; 8. Conductive rod; 9. Conductive groove; 10. Connecting rod; 11. Piston; 12. Sliding hole; 13. Air hole; 14. First spring; 15. Moving hole; 16. Moving rod; 17. Locking hole; 18. Triangular locking block; 19. Second spring; 20. Triangular locking groove; 21. Operating hole; 22. T-shaped pull rod; 23. Conical magnet; 24. Magnetic strip; 25. Reset cavity; 26. Retaining ring; 27. Third spring. Detailed Implementation

[0020] The utility model will now be further described with reference to the accompanying drawings and specific embodiments:

[0021] Please see Figure 1-4According to an embodiment of the present utility model, an anti-dry-burning protection device for an electric heating rod includes a mounting base 1, a heating rod 2 is installed through and fixedly mounted inside the mounting base 1, a plurality of heating wires 3 are inserted inside the heating rod 2, and a disconnection mechanism 4 is installed inside the mounting base 1.

[0022] The mounting base 1 is used to fix the heating rod 2 and provides installation space for components such as the disconnecting mechanism 4. The heating rod 2 contains a heating wire 3, which is the main component that enables the electric heating rod to perform its heating function. The heating wire 3 generates heat when energized, thus achieving the heating effect. The disconnecting mechanism 4 is a core protection mechanism that can cut off the circuit of the heating wire 3 in case of dry burning, preventing the electric heating rod from being damaged by dry burning.

[0023] In this embodiment, the disconnection mechanism 4 includes a pair of mounting cavities 5 opened inside the mounting base 1. The mounting cavities 5 are filled with nitrogen gas. A metal column 6 is fixedly installed on the side wall of the mounting cavity 5 and connected to a heating wire 3. A conductive ring 7 is sleeved on the metal column 6. A conductive rod 8 is fixedly installed at one end of each pair of conductive rings 7. The end of the conductive rod 8 is slidably connected to a conductive groove 9 opened in the mounting cavity 5. Positive and negative electrodes are respectively buried at the bottom of the pair of conductive grooves 9.

[0024] The mounting cavity 5 is filled with nitrogen gas to provide space for the nitrogen to expand when heated. The metal pillar 6 provides a base for the conductive ring 7. The conductive ring 7 is fitted onto the metal pillar 6 and connected to the conductive rod 8, and its movement controls the switching on and off of the circuit. The conductive groove 9 cooperates with the conductive rod 8 to achieve the circuit connection.

[0025] In this embodiment, a pair of conductive rings 7 are each fixedly mounted with a connecting rod 10 on the side away from one end. The other end of the connecting rod 10 is fixedly connected to a piston 11. A sliding hole 12 is opened in the mounting base 1 and communicates with the mounting cavity 5. The piston 11 is slidably connected to the sliding hole 12. The inner end of the sliding hole 12 passes through the mounting base 1 and is provided with an air hole 13. A first spring 14 is fixedly connected between the piston 11 and the inner end of the sliding hole 12.

[0026] The piston 11 is propelled by the expansion of nitrogen gas, which in turn moves the conductive ring 7 via the connecting rod 10. The vent 13 balances the internal and external gas pressures of the sliding hole 12. The first spring 14 is used to reset the piston 11.

[0027] In this embodiment, a pair of sliding holes 12 are provided with a movable hole 15 at one end of each other. A movable rod 16 is slidably connected in the movable hole 15. A locking hole 17 is provided at one end of the sliding hole 12 of the movable rod 16. A triangular locking block 18 is slidably connected in the locking hole 17. A second spring 19 is fixedly connected between the triangular locking block 18 and the inner end of the locking hole 17. The triangular locking block 18 engages with the triangular locking groove 20 opened at the side end of the piston 11.

[0028] The movable hole 15 provides sliding space for the movable rod 16. The movable rod 16 drives the triangular locking block 18 to move. The locking hole 17 provides sliding space for the triangular locking block 18. The triangular locking block 18 engages with the triangular locking groove 20 of the piston 11, locking the position of the piston 11. The second spring 19 provides elastic force to the triangular locking block 18.

[0029] In this embodiment, a pair of movable holes 15 are connected to an operating hole 21 at their adjacent ends. A T-shaped pull rod 22 is slidably connected inside the operating hole 21. A conical magnetic block 23 is fixedly installed at the adjacent ends of a pair of movable rods 16. The end of the T-shaped pull rod 22 is conical and a magnetic strip 24 is fixedly installed inside it. A reset cavity 25 is opened inside the operating hole 21. A retaining ring 26 is fixedly installed on the T-shaped pull rod 22 at the reset cavity 25. A third spring 27 is fixedly connected between the side wall of the retaining ring 26 and the side wall of the reset cavity 25.

[0030] The operating hole 21 provides sliding space for the T-shaped pull rod 22. The T-shaped pull rod 22 slides within the operating hole 21, and the magnetic force of the magnetic strip 24 and the conical magnetic block 23 drives the moving rod 16. The reset cavity 25 provides moving space for the retaining ring 26. The retaining ring 26 cooperates with the third spring 27 to reset the T-shaped pull rod 22. The third spring 27 provides elastic force for the T-shaped pull rod 22 to reset.

[0031] In practical applications, when the device is started, the conductive ring 7 is fitted onto the metal pillar 6, making the circuit conductive. At this time, current flows through the metal pillar 6, conductive ring 7, conductive rod 8, and conductive groove 9, supplying power to the heating wire 3. After the heating wire 3 is energized, it generates heat, and the heating rod 2 begins to work normally. When there is liquid (such as water) around the heating rod 2, the liquid can carry away the heat generated by the heating rod 2 in time. The nitrogen temperature in the mounting cavity 5 is relatively stable and will not expand or contract significantly. The piston 11 remains in its initial position under the action of the first spring 14, the conductive ring 7 is continuously connected to the metal pillar 6, the circuit is stably conductive, and the heating rod 2 continues to heat normally. Once there is no liquid to dissipate heat around the heating rod 2, dry burning occurs, and the temperature of the heating rod 2 will rise sharply. Since the mounting cavity 5 is filled with nitrogen, the nitrogen expands rapidly when heated, increasing the gas pressure in the mounting cavity 5. The increased gas pressure pushes the piston 11 to slide in the sliding hole 12. The air hole 13 balances the gas pressure inside and outside the sliding hole 12, ensuring that the piston 11 can move smoothly. The piston 11 moves the conductive ring 7 via the connecting rod 10, separating the conductive ring 7 from the metal pillar 6, thereby cutting off the circuit of the heating wire 3 and preventing the electric heating rod from being damaged due to dry burning. When the piston 11 moves to a certain position, the triangular locking block 18, under the elastic force of the second spring 19, engages with the triangular locking groove 20 at the end of the piston 11, locking the position of the piston 11. In this way, even if the temperature drops and the nitrogen gas contracts, the piston 11 will not automatically reset due to the action of the first spring 14, avoiding accidental restoration of power due to temperature fluctuations and ensuring the safety of the electric heating rod after dry burning. When the electric heating rod needs to be used normally again, the T-shaped pull rod 22 is manually pulled, and the T-shaped pull rod 22 slides in the operating hole 21. The magnetic strip 24 at the end of the T-shaped pull rod 22 and the conical magnetic block 23 generate magnetic attraction, causing the conical magnetic block 23 and the moving rod 16 to slide in the moving hole 15. The movement of the moving rod 16 causes the triangular locking block 18 to disengage from the triangular locking groove 20, releasing the lock on the piston 11. The piston 11 resets under the action of the first spring 14, and via the connecting rod 10, it drives the conductive ring 7 to re-attach to the metal post 6, restoring circuit continuity and allowing the electric heating rod to function normally again. Simultaneously, the T-shaped pull rod 22 resets under the action of the third spring 27, and the retaining ring 26 moves within the reset cavity 25, ensuring that the T-shaped pull rod 22 returns to its initial position, preparing for the next possible protective action.

[0032] In the description of this utility model, it should be noted that the terms "top," "bottom," "one side," "the other side," "front," "back," "middle part," "inner," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dry-burn protection device for an electric heating rod, characterized in that, The device includes a mounting base (1), in which a heating rod (2) is installed through and fixedly mounted. Multiple heating wires (3) are inserted inside the heating rod (2). A disconnecting mechanism (4) is installed inside the mounting base (1). The disconnecting mechanism (4) includes a pair of mounting cavities (5) opened inside the mounting base (1). The mounting cavities (5) are filled with nitrogen gas. A metal column (6) is fixedly mounted on the side wall of the mounting cavity (5) and connected to the heating wires (3). A conductive ring (7) is sleeved on the metal column (6). A conductive rod (8) is fixedly mounted on one end of each pair of conductive rings (7). The end of the conductive rod (8) is slidably connected to a conductive groove (9) opened in the mounting cavity (5). Positive and negative electrodes are buried at the bottom of the pair of conductive grooves (9).

2. The anti-dry-burning protection device for an electric heating rod according to claim 1, characterized in that, A connecting rod (10) is fixedly installed on the side away from one end of each of the pair of conductive rings (7). The other end of the connecting rod (10) is fixedly connected to a piston (11). A sliding hole (12) is opened in the mounting seat (1) and communicates with the mounting cavity (5). The piston (11) is slidably connected to the sliding hole (12). The inner end of the sliding hole (12) passes through the mounting seat (1) and is provided with an air hole (13). A first spring (14) is fixedly connected between the piston (11) and the inner end of the sliding hole (12).

3. The anti-dry-burning protection device for an electric heating rod according to claim 2, characterized in that, Each of the two sliding holes (12) has a movable hole (15) at one end. A movable rod (16) is slidably connected in the movable hole (15). A locking hole (17) is opened at one end of the sliding hole (12) of the movable rod (16). A triangular locking block (18) is slidably connected in the locking hole (17). A second spring (19) is fixedly connected between the triangular locking block (18) and the inner end of the locking hole (17). The triangular locking block (18) engages with the triangular locking groove (20) opened at the side end of the piston (11).

4. The anti-dry-burning protection device for an electric heating rod according to claim 3, characterized in that, A pair of movable holes (15) are connected to an operating hole (21) at their near ends. A T-shaped pull rod (22) is slidably connected inside the operating hole (21). A conical magnetic block (23) is fixedly installed at the near ends of a pair of movable rods (16). The end of the T-shaped pull rod (22) is conical and a magnetic strip (24) is fixedly installed inside. A reset cavity (25) is opened inside the operating hole (21). A retaining ring (26) is fixedly installed on the T-shaped pull rod (22) at the reset cavity (25). A third spring (27) is fixedly connected between the side wall of the retaining ring (26) and the side wall of the reset cavity (25).

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