CN114975028B - Single-phase circuit breaker for preventing overload and short circuit of instantaneous circuit - Google Patents

Abstract

The invention relates to the technical field of circuit breakers, and discloses a single-phase circuit breaker for preventing overload and short circuit of an instantaneous circuit, which comprises a driving mechanism, a movable contact, a stationary contact, an overcurrent release and a thermal release, wherein the driving mechanism consists of a first hook rod, a second hook rod and a mechanism deflector rod, the first hook rod and the second hook rod can be hooked, the movable contact is arranged on the second hook rod, and the thermal release comprises a memory metal sheet, a one-way switch, a sliding rheostat and a pushing device. According to the invention, the driving rod is pulled downwards when the memory metal sheet is overloaded and deformed for the first time, the driving rod drives the driven rod to move, so that the sliding sheet moves to the highest resistance position of the sliding rheostat, and when the memory metal sheet is cooled and restored to the original state, the current of a circuit is reduced by connecting a larger resistance into the circuit of the memory metal sheet, so that the overload is prevented, the circuit can be connected, and the problem that the circuit can only be manually switched on after the overload is disconnected is solved.

Description

Single-phase circuit breaker for preventing overload and short circuit of instantaneous circuit

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a single-phase circuit breaker for preventing an instantaneous circuit from being overloaded and short-circuited.

Background

The circuit breaker is also called an air switch, and is a very basic low-voltage electrical appliance, and the circuit breaker has the functions of overload, short circuit and undervoltage protection and can protect the capacity of a circuit and a power supply. It can be used to distribute electric energy, start asynchronous motor infrequently, protect power supply circuit and motor, and automatically cut off circuit when they have serious overload or short circuit and undervoltage faults, and its function is equivalent to the combination of fuse switch and over-and-under-heat relay.

The circuit breaker is mainly composed of three basic parts, namely a contact, an arc extinguishing system and various releases including an over-current release, a thermal release and the like. The breaker switch is manually or electrically switched on by an operating mechanism, after the contact is closed, the contact is locked at the switching-on position by a free tripping mechanism, and when the circuit breaks down, the free tripping mechanism is actuated by respective tripping devices to automatically trip to realize the protection effect. When the circuit is short-circuited or seriously overloaded, the armature of the overcurrent release is attracted, so that the free release mechanism acts, and the main contact breaks the main circuit. When the circuit is overloaded, the bimetallic strip of the thermal release bends upwards to push the free tripping mechanism to act. The main contacts of the low-voltage circuit breaker are manually or electrically switched. After the main contact is closed, the free tripping mechanism locks the main contact at the closing position. The coil of the overcurrent release and the metal sheet of the thermal release are connected with the main circuit in series.

The existing circuit breaker needs manual switching-on after overload tripping, and the automatic switching-on operation cannot be carried out. The reason why the household appliance can be normally powered on after the breaker is tripped and manually switched on is that after some household appliances are tripped by the breaker, the household appliances are changed from a starting state to a pause state or a stop state due to the fact that current is cut off, and therefore the circuit can be connected again when the breaker is directly switched on. However, since the circuit breaker cannot be automatically switched on, if the circuit breaker trips at night, the lamp can be turned off, and the circuit breaker is inconvenient to walk in a dark environment, so that the life is inconvenient.

In addition, if the used home appliances are not suspended or stopped due to power failure after the circuit breaker is tripped, the home appliances may be tripped again even if the home appliances are manually switched on, and a person may not know how many home appliances need to be switched off to connect the circuits, and may only switch on again after part of the home appliances are switched off, and if the home appliances still trip, the remaining home appliances need to be switched off again, which may cause multiple trips, so that the circuit breaker in the prior art has inconvenience in use.

Disclosure of Invention

Aiming at the defects of the existing single-phase circuit breaker in the use process in the background technology, the invention provides the single-phase circuit breaker for preventing the overload and the short circuit of the instantaneous circuit, which has the advantages of automatic switching-on and displaying the power of an electric appliance with multiple circuits connected, and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a single-phase circuit breaker that instantaneous circuit overload prevention and short circuit were used, includes actuating mechanism, movable contact, stationary contact, overflows release and thermal release, actuating mechanism comprises hook stem one, hook stem two and mechanism driving lever, hook stem one and hook stem two can be colluded, the movable contact sets up on hook stem two, thermal release includes memory sheetmetal, single-pass switch, slide rheostat and thrust unit, be provided with the gleitbretter on the slide rheostat, the single-pass switch is located the below of memory sheetmetal, the top of memory sheetmetal is provided with intermittent type drive device, thrust unit is located the top of memory sheetmetal, be connected with the intermittent type connector between thrust unit's drive end and the gleitbretter.

Preferably, the memory metal sheet comprises a deformation section and a solid section, the solid section is in a flat plate shape, the solid section is connected to one end of the deformation section, the single-pass switch and the intermittent driving device are respectively located at the upper end and the lower end of the solid section, a tapered groove is formed in the solid section, the tapered groove is in a tapered shape with a large upper portion and a small lower portion, a push rod is arranged below the tapered groove, and the push rod extends to the inside of the tapered groove.

Preferably, thrust unit includes cylinder body, driving lever, driven lever, memory cotton and plug, the cylinder body is the type of falling L, driving lever and driven lever sliding connection respectively are at the both ends of cylinder body, the memory cotton sets up in the inside of cylinder body and is located the driving lever department, the one end that the driving lever extends to the cylinder body outside is connected with the plug, but the plug block is in the bell jar, the one end that the driven lever extends to the cylinder body outside is connected with the gleitbretter.

Preferably, the intermittent driving device comprises an electromagnetic coil, an armature and a self-locking switch, a circuit of the intermittent driving device is connected with a circuit of the thermal release in parallel, the self-locking switch is located above the solid section, after the deformation section is deformed, the solid section can press the self-locking switch, the armature is connected to the second hook rod, and the electromagnetic coil is located on one side, close to the first hook rod, of the armature.

Preferably, the intermittent type connector is including smooth case, kelly, draw-in groove and extension spring, driven lever and gleitbretter slide to cup joint in smooth case, the kelly is the L type, the one end of kelly is rotated and is connected on the driven lever, the other end joint of kelly is in the draw-in groove, the top surface of gleitbretter is seted up to the draw-in groove, the surface that the draw-in groove is close to the one end of cylinder body is the perpendicular, the surperficial slope of the one end of cylinder body is kept away from to the draw-in groove upwards, the kelly the extension spring is connected between driven lever and kelly.

Preferably, the slide sheet is connected with a slide resistance deflector rod, and in an initial state, the slide sheet is positioned at the low resistance end of the slide rheostat, and the moving strokes of the driving rod and the driven rod are the same as the moving stroke of the slide sheet.

The invention has the following beneficial effects:

1. according to the invention, the driving rod is pulled downwards when the memory metal sheet is overloaded and deformed for the first time, the driving rod drives the driven rod to move, so that the sliding sheet moves to the highest resistance position of the sliding rheostat, and when the memory metal sheet is cooled and restored to the original state, the current of a circuit is reduced by connecting a larger resistance into the circuit of the memory metal sheet, so that the overload is prevented, the circuit can be connected, and the problem that the circuit can only be manually switched on after the overload is disconnected is solved.

2. The invention extrudes the memory cotton while pulling the driving rod, stores energy by utilizing the deformation of the memory cotton, drives the driven rod to slowly move by utilizing the deformed energy of the memory cotton after the plug is dislocated with the tapered slot, and the driven rod pushes the sliding sheet to move so as to achieve the function of slowly reducing the resistance value of the slide rheostat.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial side view at A of FIG. 1;

FIG. 3 is a schematic view of the pushing device of the present invention;

FIG. 4 is a schematic view of the construction of the intermittent connector of the present invention;

FIG. 5 is a schematic view illustrating a state of the memory metal sheet during a first overload deformation according to the present invention;

FIG. 6 is a schematic diagram illustrating the first overload recovery deformation of the memory metal sheet according to the present invention;

FIG. 7 is a schematic view of the memory metal sheet in a second overload deformation state according to the present invention;

FIG. 8 is a schematic view showing the memory metal sheet deformed by the second overload recovery according to the present invention.

In the figure: 1. a drive mechanism; 101. a first hook rod; 102. a second hook rod; 103. a mechanism deflector rod; 2. a movable contact; 3. a stationary contact; 4. an overcurrent release; 5. a memory metal sheet; 501. a deformation section; 502. a shape fixing section; 503. a tapered groove; 6. a one-way switch; 7. a slide rheostat; 701. sliding blades; 702. a sliding resistance deflector rod; 8. a pushing device; 801. a cylinder body; 802. a driving lever; 803. a driven lever; 804. memory cotton; 805. a plug; 9. an intermittent connector; 901. a slide box; 902. a clamping rod; 903. a card slot; 904. a tension spring; 10. a top rod; 11. an intermittent drive device; 1101. an electromagnetic coil; 1102. an armature; 1103. self-locking switch.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a single-phase circuit breaker for preventing overload and short circuit of an instantaneous circuit comprises a driving mechanism 1, a moving contact 2, a stationary contact 3, an overcurrent release 4, a thermal release and a housing, wherein the housing is not shown in the drawing of the present application, all other components of the present application are mounted on the housing, the driving mechanism 1 comprises a first hook rod 101, a second hook rod 102 and a mechanism shift lever 103, one end of the first hook rod 101 is rotatably connected to the inner wall of the housing, one end of the second hook rod 102 is also connected to the inner wall of the housing through a spring, one end of the mechanism shift lever 103 is connected to the second hook rod 102, a fulcrum is arranged in the middle of the mechanism shift lever 103, one end of the fulcrum is connected to the housing, the moving contact 2 is connected to the second hook rod 102, the stationary contact 3 is arranged in the housing, the stationary contact 3 is connected to the overcurrent release 4 through a wire, and the thermal release comprises a memory metal sheet 5, a one-way switch 6, a sliding rheostat 7 and a pushing device 8.

Referring to fig. 1 and 2, the memory metal sheet 5 includes a deformation section 501 and a solid section 502, one end of the deformation section 501 is fixedly connected to the housing, the solid section 502 is fixedly connected to one end of the deformation section 501 away from the housing, a tapered groove 503 is formed in the solid section 502, the tapered groove 503 is tapered with a large upper end and a small lower end, the tapered groove 503 penetrates through the upper end and the lower end of the solid section 502, a one-way switch 6 located below the solid section 502 is further installed on the housing, when the memory metal sheet 5 is in a normal state, that is, when thermal deformation does not occur, the solid section 502 extrudes the one-way switch 6 to enable the one-way switch 6 to keep a connected state, when the solid section 502 leaves the one-way switch 6 and cannot continuously press the one-way switch 6, the one-way switch 6 is disconnected, a push rod 10 located below the tapered groove 503 is further installed on the housing, and when the memory metal sheet 5 is in a normal state, one end of the push rod 10 close to the solid section 502 slightly extends into the tapered groove 503.

Referring to fig. 1 and fig. 3, a sliding rheostat 7 and a pushing device 8 are both installed in a housing, the sliding rheostat 7 is connected with a sliding sheet 701 in a sliding manner, the sliding sheet 701 is connected with a sliding resistance deflector rod 702, the sliding resistance deflector rod 702 extends to the outside of the housing and can be manually moved like the mechanism deflector rod 103, an intermittent connector 9 is connected between the sliding sheet 701 and the pushing device 8, the pushing device 8 comprises a cylinder 801, the cylinder 801 is in an inverted L shape, two ends of the cylinder 801 are respectively connected with a driving rod 802 and a driven rod 803 in a sliding manner, memory cotton 804 located at the driving rod 802 is arranged inside the cylinder 801, one end of the driving rod 802 extending out of the inside of the cylinder 801 is fixedly connected with a plug 805, and the plug 805 is matched with a tapered groove 503.

To sum up, as shown in fig. 1, when the moving contact 2 contacts the fixed contact 3, the current passes through the moving contact 2, the fixed contact 3, the overcurrent release 4, the one-way switch 6, the slide rheostat 7, the memory metal sheet 5, the fixed contact 3, and the moving contact 2 to form a loop, and for the slide rheostat 7, the initial position of the slide sheet 701 is at the position where the resistance is zero, and at this time, the driven rod 803 completely extends out of the cylinder 801, and in the above circuit, the one-way switch 6, the slide rheostat 7, and the memory metal sheet 5 form the circuit of the thermal release.

When the circuit is overloaded, the current on the memory metal sheet 5 increases, the heat accumulated on the memory metal sheet 5 also increases gradually, the temperature of the memory metal sheet 5 rises continuously, after a period of time, the temperature of the memory metal sheet 5 reaches the phase transition temperature, at this time, the deformation section 501 deforms upwards to the position shown in fig. 5, at this time, the plug 805 is inserted into the tapered groove 503 and the plug 805 is clamped inside the tapered groove 503 due to friction, the circuit is disconnected because the solid section 502 does not press the one-way switch 6 any more, because there is no current on the deformation section 501, the temperature of the deformation section 501 cools to the phase transition temperature after a period of time, the deformation section 501 deforms downwards to drive the plug 805 to move downwards, so that the memory cotton 804 is squeezed to store energy, the driven rod 803 moves towards the inside of the cylinder 801 under the action of the air pressure in the cylinder 801, then pulls the slide 701 to move towards the high resistance end of the slide rheostat 7, and when the deformation section 501 completely returns to the original state, the ejector rod 10 is inserted into the tapered groove 503 from the cylinder 503 to push the plug to move upwards, so that the slide rod 803 moves towards the high resistance rheostat 801 from the outside of the cylinder 801 gradually, and the slide rod 801 gradually returns to the high resistance rheostat 801, and the slide rod 701 moves gradually moves towards the high resistance end of the cylinder 801 along the cylinder 801, and the slide rheostat 701, and the slide bar is gradually moves gradually.

Referring to fig. 4, one end of the driven rod 803 extending out of the cylinder 801 is connected to the intermittent connector 9, the intermittent connector 9 includes a slide case 901, a clamping rod 902, a clamping groove 903, and a tension spring 904, one end of the driven rod 803 and one end of the slide piece 701 both extend into the slide case 901, and one end of the driven rod 803 and one end of the slide piece 701 both located in the slide case 901 are provided with a limiting end to prevent the driven rod 803 and the slide piece 701 from falling out of the slide case 901, but the right end of the slide case 901 is provided with an opening from which the driven rod 803 and the clamping rod 902 can be removed, the clamping rod 902 is L-shaped, one end of the clamping rod 902 is rotatably connected to the driven rod 803, the other end of the clamping rod 902 is clamped in the clamping groove 903, the clamping groove 903 is opened in the top surface of the slide piece 701, the side surface of the clamping groove 903 close to the end of the cylinder 801 is a vertical surface, the side surface 903 far from the end of the cylinder 801 is inclined upward, and the two side surfaces of the clamping rod 902 are vertical surfaces, and the tension spring 904 is connected between the clamping rod 902 and the driven rod 803. When the driven rod 803 moves to the inside of the cylinder 801, that is, to the left side, the driven rod 803 drives the sliding piece 701 to move to the left side through the contact between the clamping groove 903 and the vertical surface of the clamping rod 902, when the driven rod 803 moves to the outside of the cylinder 801, under the normal condition, under the action of the slow deformation force of the memory cotton 804, the driven rod 803 can drive the sliding piece 701 to move to the left side slowly through the clamping rod 902, but during the movement process, the deformation section 501 deforms again due to overload, so that a large force is applied to the driving rod 802, the driving rod 802 instantaneously moves to the extreme position in the cylinder 801, the driven rod 803 is driven to move to the left side quickly, when the moving speed of the driven rod 803 increases suddenly, the clamping rod 902 moves out of the clamping groove 903 along with the movement of the driven rod 803 to the right side due to the inertia effect, so that the sliding piece 701 stays at the moment of deformation of the deformation section 501, the driven rod 803 moves to the right side extreme position, at this time, the resistance position at the sliding piece 701 can be obtained, when the reset is needed, the sliding piece 702 is manually pulled to move to the right side, thereby driving the sliding piece 701 to the extreme position, namely, the clamping rod 904, the clamping spring is clamped by the clamping spring 904 again.

Referring to fig. 1, an intermittent driving device 11 is mounted on a housing, the intermittent driving device 11 includes an electromagnetic coil 1101, an armature 1102 and a self-locking switch 1103, the electromagnetic coil 1101 is disposed at one end of a second hook bar 102 close to a first hook bar 101, the electromagnetic coil 1101 and the self-locking switch 1103 are connected in series and then connected in parallel with a circuit of a thermal release, the armature 1102 is connected to the second hook bar 102, the self-locking switch 1103 is disposed above a solid section 502, and the self-locking switch 1103 is characterized in that a circuit is connected by one-time pressing and a circuit is disconnected by two-time pressing. Therefore, after the deformation section 501 deforms upwards for the first time, the solid section 502 presses the self-locking switch 1103, so that the circuit of the electromagnetic coil 1101 is switched on, when the deformation section 501 deforms downwards after cooling and does not press the self-locking switch 1103 any more, because the circuit of the electromagnetic coil 1101 is switched on, the electromagnetic coil 1101 attracts the armature 1102 on the hook rod II 102, so that the armature 1102 moves towards the right side to be hooked with the hook rod I101, when the deformation section 501 completely recovers, the solid section 502 presses the one-way switch 6 again, and at this time, the circuit of the thermal trip device is switched on again.

The using method of the invention is as follows:

in the initial state, the circuit is in the state shown in fig. 1, the circuit is completely switched on at the moment, when the circuit is overloaded, the temperature of the deformation section 501 gradually rises until the phase change temperature is reached, the deformation section 501 deforms upwards, which is the first overload deformation, at the moment, the state is shown in fig. 5, the solid section 502 moves upwards along with the deformation section 501, the solid section 502 simultaneously pushes the first hook rod 101 upwards, so that the first hook rod 101 and the second hook rod 102 are staggered, the circuit is switched off, and the one-way switch 6 is released;

after the deformation section 501 deforms upwards, the self-locking switch 1103 is pressed, so that the circuit of the electromagnetic coil 1101 is connected, at the moment, the electromagnetic coil 1101 attracts the armature 1102, the hook rod II 102 moves towards the right side to be hooked with the hook rod I101, at the moment, the one-way switch 6 is disconnected, so that the circuit is still disconnected, and meanwhile, the plug 805 is clamped in the tapered groove 503 under the action of friction force;

because the one-way switch 6 is turned off, no current passes through the deformation section 501, after a period of time, the temperature of the deformation section 501 is reduced to the phase change temperature thereof, the deformation section 501 is deformed downwards to restore to the original shape, which is the first time of the overload restoration deformation of the memory metal sheet, so that the solid section 502 drives the driving rod 802 to move downwards, the driven rod 803 moves towards the inside of the cylinder 801, the sliding sheet 701 is driven to move from the low resistance end to the high resistance end of the sliding rheostat 7, and the memory cotton 804 is compressed due to the downward movement of the driving rod 802, when the deformation section 501 is completely deformed downwards to restore to the original shape, the ejector rod 10 extends into the tapered groove 503, the plug 805 is ejected out of the tapered groove 503, the driving rod 802 slowly moves towards the inside of the cylinder 801 under the deformation of the memory cotton 804, and then the driven rod 803 is slowly moves towards the outside of the cylinder 801, thereby achieving the purpose of pushing the sliding sheet 701 to slowly move from the high resistance end to the low resistance end;

in the process that the sliding sheet 701 moves slowly from the high resistance end to the low resistance end, if the sliding sheet 701 moves to the zero resistance position all the time and the deformation section 501 is not deformed due to overload, it indicates that part of the electric appliances are suspended or closed after the deformation section 501 is deformed for the first time and power is cut off, so that the load connected on the circuit is reduced, the circuit is normally connected at the moment, and the function of automatic switching-on is realized;

if the sliding piece 701 moves slowly from the high resistance end to the low resistance end, and when the sliding piece 701 does not move to the zero resistance position, the deformation section 501 deforms upward again due to overload, which is the second overload deformation of the memory metal sheet, referring to fig. 7, at this time, the first hook rod 101 is pushed upward by the solid section 502, the first hook rod 101 is not hooked with the second hook rod 102 any more, the solid section 502 presses the self-locking switch 1103 again, so that the self-locking switch 1103 is disconnected, the circuit of the electromagnetic coil 1101 is disconnected, the electromagnetic coil 1101 does not have an attraction effect on the armature 1102, the second hook rod 102 moves leftward under the action of the spring, so that the first hook rod 101 and the second hook rod 102 are dislocated, and the circuit is disconnected; when the deformation section 501 deforms, the driving rod 802 does not completely move upwards to the original position, and therefore is suddenly pressed by the solid section 502, the moving speed of the driving rod 802 is suddenly increased, at this time, the intermittent connector 9 enables the driven rod 803 to be staggered with the sliding sheet 701, the sliding sheet 701 is not pushed by the driven rod 803, the sliding sheet 701 stops at the position where the deformation section 501 deforms, the resistance value can be converted into a power value, the power value is an excessive load, and an electric appliance with the same power value is manually closed, so that a circuit can be switched on and is in a normal load condition; then, after the circuit is disconnected, the deformation section 501 deforms downward again to restore to the original shape, which is the deformation of the memory metal sheet due to the second overload recovery, as shown in fig. 8, although the one-way switch 6 is pressed again by the solid section 502, since the circuit of the electromagnetic coil 1101 is disconnected and the first hook rod 101 and the second hook rod 102 are not hooked together, the circuit is still disconnected at this time, the mechanical lever 103 needs to be pulled manually to hook the first hook rod 101 and the second hook rod 102 together, the circuit can be reconnected, and meanwhile, the sliding sheet 701 is located at the low-resistance end of the sliding rheostat 7 by shifting the sliding resistance lever 702.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. The utility model provides a single-phase circuit breaker that instantaneous circuit overload prevention and short circuit were used, includes actuating mechanism (1), movable contact (2), stationary contact (3), overflows release (4) and hot release, actuating mechanism (1) comprises hook rod one (101), hook rod two (102) and mechanism driving lever (103), hook rod one (101) and hook rod two (102) can be in hook, movable contact (2) set up on hook rod two (102), its characterized in that: the thermal trip comprises a memory metal sheet (5), a one-way switch (6), a sliding rheostat (7) and a pushing device (8), wherein a sliding sheet (701) is arranged on the sliding rheostat (7), the one-way switch (6) is positioned below the memory metal sheet (5), an intermittent driving device (11) is arranged above the memory metal sheet (5), the pushing device (8) is positioned above the memory metal sheet (5), and an intermittent connector (9) is connected between the driving end of the pushing device (8) and the sliding sheet (701);

the memory metal sheet (5) comprises a deformation section (501) and a solid section (502), the solid section (502) is in a flat plate shape, the solid section (502) is connected to one end of the deformation section (501), the single-pass switch (6) is located at the lower end of the solid section (502), the intermittent driving device (11) is located at the upper end of the solid section (502), a tapered groove (503) is formed in the solid section (502), the tapered groove (503) is in a tapered shape with a large upper part and a small lower part, a push rod (10) is arranged below the tapered groove (503), and the push rod (10) extends to the inside of the tapered groove (503);

the pushing device (8) comprises a cylinder body (801), a driving rod (802), a driven rod (803), memory foam (804) and a plug (805), wherein the cylinder body (801) is in an inverted L shape, the driving rod (802) is connected to one end of the cylinder body (801) in a sliding mode, the driven rod (803) is connected to the other end of the cylinder body (801) in a sliding mode, the memory foam (804) is arranged inside the cylinder body (801) and located at the driving rod (802), one end, extending to the outer side of the cylinder body (801), of the driving rod (802) is connected with the plug (805), the plug (805) can be clamped in the tapered groove (503), and one end, extending to the outer side of the cylinder body (801), of the driven rod (803) is connected with a sliding sheet (701);

the intermittent driving device (11) comprises an electromagnetic coil (1101), an armature (1102) and a self-locking switch (1103), the circuit of the intermittent driving device (11) is connected with the circuit of the thermal release in parallel, the self-locking switch (1103) is positioned above a solid section (502), after the deformation section (501) is deformed, the solid section (502) can press the self-locking switch (1103), the armature (1102) is connected to a second hook rod (102), and the electromagnetic coil (1101) is positioned on one side, close to a first hook rod (101), of the armature (1102);

the intermittent connector (9) comprises a sliding box (901), a clamping rod (902), a clamping groove (903) and a tension spring (904), the driven rod (803) and a sliding piece (701) are slidably sleeved in the sliding box (901), the clamping rod (902) is L-shaped, one end of the clamping rod (902) is rotatably connected to the driven rod (803), the other end of the clamping rod (902) is clamped in the clamping groove (903), the clamping groove (903) is formed in the top surface of the sliding piece (701), the surface of one end, close to the cylinder body (801), of the clamping groove (903) is a vertical surface, the surface of one end, far away from the cylinder body (801), of the clamping groove (903) inclines upwards, one end of the tension spring (904) is connected to the driven rod (803), and the other end of the tension spring (904) is connected to the clamping rod (902);

the sliding sheet (701) is connected with a sliding resistance deflector rod (702), in an initial state, the sliding sheet (701) is located at the low-resistance end of the sliding rheostat (7), and the moving strokes of the driving rod (802) and the driven rod (803) are the same as that of the sliding sheet (701).

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