CN108962673B - Electric power overheat protection device - Google Patents

Abstract

The invention belongs to the field of electrical components, and in particular relates to an electrical overheating protection device, comprising a casing provided with an opening, a piston inside the casing, and a closed cavity formed by the piston, the bottom of the casing and the side wall of the casing There is a resistance in the cavity, and a regulating valve is arranged on the side wall of the cavity. After the resistance is heated, the air pressure in the cavity can push the piston to move in the direction of the opening; it also includes a power-off component, and the piston can move in the direction of the opening. Trigger power-off components. The invention pushes the movement of the piston through the heat generated by the resistance to cut off the circuit, and the set regulating valve can adjust the range of the air pressure in the cavity to regulate the size of the trigger current. When the resistor no longer generates heat, the piston can automatically return to its original state, and the sealing structure of the present invention has a simple structure, is not easily damaged, and is durable.

Description

An electrical overheating protection device

technical field

The invention belongs to the field of electrical components, and in particular relates to a power overheating protection device.

Background technique

The traditional overheat protector is composed of two different alloys, which will generate heat after passing the current. Due to the different thermal expansion coefficients of the two different alloys, the alloy will bend in one direction, and the contacts will leave, thereby realizing power failure.

The above-mentioned overheat protector has many disadvantages. First, the thermal deformation of the aluminum alloy is a fixed value, so it is impossible to adjust the current that triggers the disconnection of the aluminum alloy contact; secondly, the function is single, and only a single power-off function can be realized; Yes, it is greatly interfered by the outside world during use, and the aluminum alloy sheet is easily damaged and affects the use, etc.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides an adjustable power overheating protection device with multiple functions and high stability.

An electric overheating protection device provided by the present invention includes a casing with an opening, a piston is arranged in the casing, the piston, the bottom of the casing and the side wall of the casing form a closed cavity, and the cavity is provided with a piston. There is a resistance, and a regulating valve is arranged on the side wall in the cavity. After the resistance is heated, the air pressure in the cavity can push the piston to move in the direction of the opening; it also includes a power-off component, which can trigger the power-off component after the piston moves in the direction of the opening.

As a further optimization of the present invention, the disconnection assembly includes two conductors in contact with each other, wherein one conductor is mounted on the piston and the other conductor is mounted on the housing, and the piston moves toward the opening to disconnect the two conductors.

As a further optimization of the present invention, the power-off assembly includes a baffle, a plug rod, a compression spring and a guide piece; the baffle is sealed between the piston and the opening, and the baffle is provided with a through baffle, the middle is large and the two ends are small. The inner cavity, the middle of the inner cavity leads out two channels, one channel penetrates the inner side of the baffle, and the other channel penetrates the outer side of the baffle; the baffle is also provided with a one-way valve; one end of the plug rod extends from the inner side of the baffle Penetrating into the inner cavity, the head of the plug rod is also provided with a plug head, which can block the openings of the two channels at the same time; one side of the compression spring is connected with the plug head, and the other side of the compression spring and the inner cavity face the outer side of the baffle plate The guide piece is detachably clamped between the baffle plate and the opening of the casing, and the opening of the casing is provided with a conductor part connected to the guide piece.

As a further optimization of the present invention, a retaining ring is formed by the opening of the casing, and the conductor part is arranged on the inner side of the retaining ring; the periphery of the guide piece is provided with a soft ring made of silica gel, and the soft ring is clamped between the retaining ring and the baffle, and the guiding The middle part of the sheet protrudes outward in the direction of the opening of the casing, so that the guide sheet is formed into a cap shape.

As a further optimization of the present invention, the lead wires at both ends of the resistor pass out of the housing and are connected to both ends of the magnetic induction coil.

The present invention provides an overheating protection device for electric power, which pushes the piston to move through the heat generated by the resistance to cut off the circuit, and the regulating valve can adjust the range of the air pressure in the cavity to regulate the size of the trigger current. When the resistor no longer generates heat, the piston can automatically return to its original state, and the sealing structure of the present invention has a simple structure, is not easily damaged, and is durable.

Description of drawings

Fig. 1 is the structural representation of the present invention;

2 is an enlarged schematic view of a part of the power-off assembly of the structure shown in FIG. 1;

Among them, the housing 100, the cavity 110, the opening 120, the retaining ring 130, the conductor part 140, the piston 200, the resistor 300, the regulating valve 400, the baffle 510, the one-way valve 511, the inner cavity 512, the channel 513, the plug rod 520 , the plug 521, the compression spring 530, the guide piece 540, the magnetic induction coil 600.

Detailed ways

The present invention will be described in detail below with reference to specific embodiments.

As shown in FIG. 1 , the present embodiment includes a casing 100 with an opening 120 , a piston 200 is arranged in the casing 100 , and a closed cavity is formed by the piston 200 , the bottom of the casing 100 and the side wall of the casing 100 . 110. There is a resistor 300 in the cavity 110. After the resistor 300 is heated, the air pressure of the cavity 110 can push the piston 200 to move in the direction of the opening 120. The side wall of the cavity 110 is also provided with a regulating valve 400. The regulating valve 400 is used for To adjust the pressure in the cavity 110 , on the one hand, it plays a safety role, and on the other hand, it can also regulate the pressure threshold in the cavity 110 . A power-off assembly is also included, and the power-off assembly can be triggered after the piston 200 moves in the direction of the opening 120 .

The present invention provides that the heat generated by the resistor 300 pushes the piston 200 to move to cut off the circuit. This structure includes several advantages. First, when the resistor 300 no longer generates heat, the piston 200 can automatically return to its original state, with automatic reset. Second, it adopts a sealed structure, which is not disturbed by the external environment, is not easy to be damaged, and is durable; third, the set regulating valve 400 can adjust the air pressure range in the cavity 110 to regulate the size of the trigger current; fourth , the supply of thermal energy to the piston 200 is not only used to cut off the power-off components, but also can be used as a trigger for other mechanical or electronic control devices, which not only realizes two functions of one movement, simplifies the structure, but also makes full use of energy ,Energy saving and environmental protection.

The disconnection assembly can have various structures, one of which includes two conductors in contact with each other, wherein one conductor is mounted on the piston 200 and the other conductor is mounted on the housing 100, and the piston 200 can move toward the opening 120. Disconnect the two conductors. This solution is relatively simple, and only realizes the power-off function. Of course, during use, the movement of the piston 200 can also be used as a triggering device for another mechanical or electrical element.

Another solution may be adopted for the power-off assembly. As shown in FIG. 1 and FIG. 2 , the power-off assembly in this solution includes a baffle 510 , a plug rod 520 , a compression spring 530 and a guide piece 540 . The baffle 510 is sealingly disposed between the piston 200 and the opening 120 . The baffle 510 is provided with an inner cavity 512 penetrating the baffle 510 and having a large middle and two small ends. The middle of the inner cavity 512 leads out two channels 513 and one channel 513 Passing through the inner side of the baffle 510 , a channel 513 passes through the outer side of the baffle 510 . The baffle 510 is also provided with a one-way valve 511 . One end of the plug rod 520 penetrates into the inner cavity 512 from the inner side of the baffle plate 510 , and the plug head 521 is further provided with a plug head 521 , which can block the openings 120 of the two channels 513 at the same time. One side of the compression spring 530 is connected to the plug 521 , and the other side of the compression spring 530 is connected to the end face of the inner cavity 512 facing the outer side of the baffle 510 . The guide piece 540 is detachably clamped between the baffle 510 and the opening 120 of the housing 100 , and the opening 120 of the housing 100 is provided with a conductor portion 140 connected to the guide piece 540 .

The principle and method of using the program are as follows:

After the resistor 300 is energized, heat is generated, and the heat increases the air pressure in the cavity 110 to push the piston 200 to move. The piston 200 moves forward to increase the air pressure in the cavity between the piston 200 and the baffle 510 until the piston 200 presses against the plug. The rod 520 pushes the plug rod 520, so that the plug head 521 no longer blocks the two channels 513. After the two channels 513 are connected through the inner cavity 512, the air pressure in the cavity between the piston 200 and the baffle 510 will suddenly move forward After being sprayed, the air pressure hits the guide piece 540, so that the guide piece 540 is immediately separated from the conductor portion 140 to function as a power off. The compression spring 530 and the one-way valve 511 are both used for resetting the piston 200 after the air pressure in the cavity 110 is cooled.

In some fault circuits, the current is large. When the fuse is blown, an arcing phenomenon will occur between the two poles. The current cannot be cut off in time, resulting in damage to the power equipment. The above scheme can be well used for this kind of In some cases, the air pressure sprayed from the channel 513 hits the guide piece 540 like an air gun, so that the guide piece 540 is instantly separated from the conductor portion 140 at the opening 120, thus ensuring the safety of the circuit.

As a preferred option of the above solution, the opening 120 of the housing 100 protrudes inwardly to form a retaining ring 130, and the conductor portion 140 is arranged inside the retaining ring 130; Between the baffles 510 , the middle portion of the guide piece 540 protrudes outward in the direction of the opening 120 of the housing 100 , so that the guide piece 540 forms a cap shape. Using a soft ring to be clamped between the retaining ring 130 and the baffle 510 is convenient for both positioning and disengagement. The cap-shaped guide piece 540 can reasonably withstand the air resistance in the process of flying outwards, so that the guide piece 540 and the conductor part 140 can be separated more easily. In addition, the airflow ejected from the channel 513 can hit the concave part of the guide piece 540. The force of the guide piece 540 is more concentrated, and the effect of separating the guide piece 540 from the conductor portion 140 is enhanced.

Preferably, the lead wires at both ends of the resistor 300 pass through the casing 100 and are connected to both ends of the magnetic induction coil 600 . This preferred mode enables the present invention to be used in more occasions.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that , the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims (4)

1. An electric overheat protection device is characterized by comprising a shell with an opening, wherein a piston is arranged in the shell, the piston, the bottom of the shell and the side wall of the shell form a closed cavity, a resistor is arranged in the cavity, an adjusting valve is arranged on the side wall in the cavity, and after the resistor is heated, the air pressure in the cavity can push the piston to move towards the opening; the piston can trigger the power-off assembly after moving towards the opening direction;

the power-off assembly comprises a baffle plate, a plug rod, a compression spring and a guide sheet;

the baffle is hermetically arranged between the piston and the opening, an inner cavity which penetrates through the baffle and is large in the middle and small in the two ends is arranged on the baffle, two channels are led out from the middle of the inner cavity, one channel penetrates through the inner side surface of the baffle, and the other channel penetrates through the outer side surface of the baffle; the baffle is also provided with a one-way valve;

one end of the plug rod penetrates into the inner cavity from the inner side surface of the baffle plate, and the plug head is arranged at the end of the plug rod and can simultaneously block the openings of the two channels;

one side of the compression spring is connected with the plug head, and the other side of the compression spring is connected with the end face of the inner cavity facing the outer side face of the baffle;

the guide sheet can be disassembled and clamped between the baffle and the opening of the shell, and the opening of the shell is provided with a conductor part connected with the guide sheet.

2. An electrical overheat protection apparatus as claimed in claim 1 wherein the current interrupting assembly comprises two conductors in contact with each other, one of the conductors being mounted on the piston and the other of the conductors being mounted on the housing, the movement of the piston towards the opening being capable of disconnecting the two conductors.

3. An electric overheat protection apparatus as claimed in claim 1, wherein a retainer is formed to protrude inwardly of the opening of the case, and the conductor portion is provided inside the retainer; the periphery of the guide sheet is provided with a soft ring made of silica gel, the soft ring is clamped between the retainer ring and the baffle, and the middle part of the guide sheet protrudes outwards towards the opening direction of the shell to enable the guide sheet to form a hat shape.

4. The overheat protection device for electric power as claimed in claim 1, wherein the leads at both ends of the resistor are extended out of the case and connected to both ends of the magnetic induction coil.

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