阅读说明：本技术 一种具有电路安全保护的烤面包机 (Toaster with circuit safety protection ) 是由 欧永茂 张远志 于 2021-08-18 设计创作，主要内容包括：本发明涉及一种具有电路安全保护的烤面包机,包括底座和机芯,机芯内设有多个发热片,机芯内通过复位弹簧连接有升降架,升降架用于使面包插入或远离多个发热片之间,升降架上设有拨杆；底座上还设有双刀开关和控制电路板,控制电路板与电源和发热片相连接,控制电路板上设有三刀电制,拨杆与三刀电制的其中一个电制相适配,双刀开关与三刀电制的另外两个电制相适配；双刀开关下方设有电磁铁组件和推杆组件,电磁铁组件和推杆组件均与控制电路板电连接,电磁铁组件和推杆组件均用于控制双刀开关与三刀电制的通断。本发明在烤面包机过热或电路故障时,能迅速断开双刀开关,避免升降架卡紧等异常情况的影响,实现对电路的多重断电保护。(The invention relates to a bread toaster with circuit safety protection, which comprises a base and a machine core, wherein a plurality of heating sheets are arranged in the machine core, a lifting frame is connected in the machine core through a return spring, the lifting frame is used for enabling bread to be inserted into or far away from among the plurality of heating sheets, and a driving lever is arranged on the lifting frame; the base is also provided with a double-pole switch and a control circuit board, the control circuit board is connected with a power supply and a heating sheet, the control circuit board is provided with a three-pole electric system, the deflector rod is matched with one of the three-pole electric system, and the double-pole switch is matched with the other two of the three-pole electric system; an electromagnet assembly and a push rod assembly are arranged below the double-pole switch, the electromagnet assembly and the push rod assembly are electrically connected with a control circuit board, and the electromagnet assembly and the push rod assembly are used for controlling the on-off of the double-pole switch and the three-pole electric system. The invention can quickly disconnect the double-pole switch when the toaster is overheated or the circuit fails, thereby avoiding the influence of abnormal conditions such as clamping of the lifting frame and the like and realizing multiple power-off protection on the circuit.)

1. A bread toaster with circuit safety protection comprises a base (1) and a machine core (2) arranged on the base (1), wherein a plurality of heating sheets (21) are arranged in the machine core (2), and the bread toaster is characterized in that a lifting frame (23) is connected in the machine core (2) through a return spring (22), the lifting frame (23) is used for enabling bread to be inserted into or far away from among the plurality of heating sheets (21), and a driving lever (24) is arranged on the lifting frame (23);

the base (1) is further provided with a double-pole switch (11) and a control circuit board (12), the control circuit board (12) is connected with a power supply and the heating sheet (21), the control circuit board (12) is provided with a three-pole electric system (13), the deflector rod (24) is matched with one of the three-pole electric system (13), and the double-pole switch (12) is matched with the other two of the three-pole electric system (13);

two sword switch (12) below is equipped with electromagnet assembly (14) and push rod subassembly (15), electromagnet assembly (14) with push rod subassembly (15) all with control circuit board (12) electricity is connected, electromagnet assembly (14) with push rod subassembly (15) all are used for control two sword switch (12) with the break-make of three sword electrical system (13).

2. The toaster with circuit safety protection according to claim 1, wherein the electromagnet assembly (14) comprises an electromagnet core (141) and a first coil (142) wound around the electromagnet core (141), the electromagnet core (141) is fixed on the base (1) through an insulating base (143), and the double-pole switch (11) is magnetically attracted to the electromagnet core (141);

the first coil (142) is connected in series with at least two first switching elements (144), and control ends of the first switching elements (144) are respectively connected with the control circuit board (12) through control branches.

3. A toaster with circuit safety protection according to claim 2, wherein the double-pole switch (11) has permanent magnetism, the electromagnet assembly (14) further comprises a second coil (145) wound around the outside of the electromagnet core (141), the second coil (145) is located on the upper layer of the first coil (142), and the second coil (145) is wound in the opposite direction to the first coil (142);

the second coil (145) is connected with a second switch element, and the control end of the second switch element is connected with the control circuit board (12).

4. The toaster with circuit safety protection according to claim 2, wherein the push rod assembly (15) comprises a cylinder (151), a third switch element (152) is connected to the cylinder (151), and a control terminal of the third switch element (152) is connected to the control circuit board (12);

when the double-pole switch (11) needs to be jacked up, the control circuit board (12) controls the third switch element (152) to be switched on, and then the air cylinder (151) jacks up the double-pole switch (11).

5. The toaster with circuit safety protection according to any one of claims 1 to 4, wherein a notch is formed at the bottom of the base (1) corresponding to the position of the push rod assembly (15), and the notch is used for jacking up the push rod assembly (15) so as to disconnect the double-pole switch (11) from the three-pole electric system (13).

6. A toaster with circuit safety protection according to claim 5, wherein a temperature sensor (25) is arranged in the movement (2), and the temperature sensor (25) is connected to the control circuit board (12).

7. The toaster with circuit safety protection according to claim 1 or 6, wherein a position clip adapted to the lifting frame (23) is provided on the base, and when the lifting frame (23) is pressed down to a limit position, the double-pole switch (11) is pressed down and is connected to the three-pole electric switch (13); when the lifting frame (23) rebounds and is clamped in the clamping position, a space is reserved between the lifting frame (23) and the double-pole switch (11) in a free state.

8. A toaster with circuit safety protection according to claim 7, wherein the outer side of the movement (2) is wrapped by a housing (3), the lifting frame (23) is provided with a handle (26), and the handle (26) penetrates through the movement (2) and extends to the outer side of the housing (3).

9. A toaster with circuit safety protection according to claim 8, wherein the housing (3) is further provided with an operating knob (4) and an indicator light (5), and the operating knob (4) and the indicator light (5) are both electrically connected to the control circuit board (12).

10. A toaster with circuit safety protection according to claim 9, characterized in that the control circuit board (12) is a PCB circuit board, the control circuit board (12) being vertically inserted on the base (1) and located between the movement (2) and the casing (3).

Technical Field

The invention relates to the technical field of electric toasters, in particular to a toaster with circuit safety protection.

Background

With the continuous improvement of the living standard of people, the living rhythm is accelerated, and the bread becomes the breakfast choice of a plurality of office workers. The bread needs to be reheated after being refrigerated by a refrigerator and the like to recover the soft taste, so that people can use a convenient and small electric toaster to quickly heat the bread slices according to the needs. At present, current bread machine finishes the back at the culinary art, generally all can mention through internal circuit control crane, carries out the outage operation, even when mechanical failure appears, the crane is blocked and can't in time kick-back, and after the heat time overlength, also has another switch and cuts off the power supply to reach certain guard action. However, both of the two power-off modes are mainly realized through the action of the return spring, and when the return spring is worn or the control circuit is partially failed, no further power-off protection operation is performed, so that after the bread maker is used for a long time, the mechanical structure is certainly and easily worn, the power cannot be timely cut off, the connecting circuit can be gradually burnt, partial circuit paralysis is caused, once the branch of the control switch is damaged, the automatic power-off of the bread maker can not be realized, and the bread maker is easily burnt out and causes fire. In addition, if only the internal circuit is in fault and the other switch cannot be switched off, the lifting frame rebounds normally when the lifting frame is used by people, the situation of a protection circuit is unknown, the lifting frame needs to wait for a preset heating time after being pressed down, and if a circuit is short-circuited, the heating temperature is high, the heating time is too long, and the like, a great potential safety hazard exists.

Disclosure of Invention

In order to solve the above problems of the prior art, the present invention is directed to a toaster with circuit safety protection. The invention can quickly disconnect the double-pole switch when the toaster is overheated or the circuit fails, thereby avoiding the influence of abnormal conditions such as clamping of the lifting frame and the like and realizing multiple power-off protection on the circuit.

The invention relates to a bread toaster with circuit safety protection, which comprises a base and a machine core arranged on the base, wherein a plurality of heating sheets are arranged in the machine core, a lifting frame is connected in the machine core through a return spring, the lifting frame is used for enabling bread to be inserted into or far away from among the plurality of heating sheets, and a driving lever is arranged on the lifting frame;

the base is also provided with a double-pole switch and a control circuit board, the control circuit board is connected with a power supply and the heating sheet, the control circuit board is provided with a three-pole electric system, the deflector rod is matched with one of the three-pole electric system, and the double-pole switch is matched with the other two of the three-pole electric system;

the double-pole switch is provided with an electromagnet assembly and a push rod assembly below, the electromagnet assembly and the push rod assembly are electrically connected with the control circuit board, and the electromagnet assembly and the push rod assembly are used for controlling the double-pole switch and the three-pole electric system to be switched on and off.

In one embodiment, the electromagnet assembly comprises an electromagnet core body and a first coil wound on the outer side of the electromagnet core body, the electromagnet core body is fixed on the base through an insulating seat, and the double-pole switch is attracted to the electromagnet core body through magnetic force;

the first coil is connected with at least two first switching elements in series, and the control ends of the first switching elements are respectively connected with the control circuit board through control branches.

In one embodiment, the double-pole switch has permanent magnetism, the electromagnet assembly further comprises a second coil wound outside the electromagnet core body, the second coil is located on the upper layer of the first coil, and the winding direction of the second coil is opposite to that of the first coil;

the second coil is connected with a second switch element, and the control end of the second switch element is connected with the control circuit board.

In one embodiment, the push rod assembly comprises a cylinder, a third switch element is connected with the cylinder, and the control end of the third switch element is connected with the control circuit board;

when the double-pole switch needs to be jacked up, the control circuit board controls the third switch element to be switched on, and then the air cylinder jacks up the double-pole switch.

In one embodiment, a notch is formed in the bottom of the base corresponding to the position of the push rod assembly, and the notch is used for jacking the push rod assembly so as to disconnect the double-pole switch from the three-pole electric system.

In one embodiment, a temperature sensor is arranged in the movement and connected with the control circuit board.

In one embodiment, a clamping position matched with the lifting frame is arranged on the base, and when the lifting frame is pressed down to the limit position, the double-pole switch is pressed down and is communicated with the three-pole electric system; when the lifting frame rebounds and is clamped into the clamping position, a space is reserved between the lifting frame and the double-pole switch in a free state.

In one embodiment, the outer side of the movement is wrapped by a shell, the lifting frame is provided with a handle, and the handle penetrates through the movement and extends to the outer side of the shell.

In one embodiment, the shell is further provided with an operation knob and an indicator light, and the operation knob and the indicator light are both electrically connected with the control circuit board.

In one embodiment, the control circuit board is a PCB circuit board, and the control circuit board is vertically inserted on the base and located between the movement and the housing.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

1. the invention can quickly disconnect the double-pole switch when the toaster is overheated or the circuit fails, thereby avoiding the influence of abnormal conditions such as clamping of the lifting frame and the like and realizing multiple power-off protection on the circuit.

2. Accomplish the heating when bread machine according to the time, removed the resilience crane and the open circuit, can signals simultaneously and let the double pole switch disconnection, even the crane chucking and unable resilience or break down like the situation such as heating time overlength, partial short circuit of internal circuit, also can break off the connection with the power through the double pole switch, and the setting of two at least first switch element, can guarantee to work as one of them branch road trouble, another branch road also can control the disconnection of the first switch element that corresponds, and then realize the outage operation, let the magnet core lose magnetism, the double pole switch receives the resilience of elastic component such as spring and breaks off the main circuit.

3. When a fault occurs, for example, a power-off signal is sent, but the power supply is not disconnected all the time, and the fact that a short circuit or a circuit break occurs in an internal circuit is proved, then the chip sends a signal to the third switching element to enable the branch circuit to be connected, the cylinder jacks up the push rod, and then the double-pole switch is disconnected.

4. The cylinder can slide up and down, and the cylinder is jacked up to be lengthened when the double-pole switch is started, so that the operation of disconnecting the double-pole switch under the control of a circuit is not influenced. When all the protection is invalid and inconvenient dangerous sources such as power lines are contacted, a user can also jack up the cylinder of the push rod assembly through inserting the notch through an insulating rod piece such as a toothpick, and then the double-pole switch is disconnected.

5. The second switch element is also a normally open switch, such as a triode, a branch circuit of the second switch element is started only after P1 fails, the second switch element is switched on, and then the second coil generates opposite current relative to the first coil, the electromagnet core body has magnetic force with opposite magnetic poles, and the double-pole switch is a magnet with permanent magnetism and is adsorbed on the electromagnet core body in a way of being opposite to the magnetic field formed by the first coil, so that when the second coil works, the magnetic field same as that of the double-pole switch is formed, the double-pole switch is repelled and kept away from, and rebounds by the elastic piece, and the double-pole switch cannot be adsorbed on the electromagnet core body.

Drawings

FIG. 1 is a schematic diagram of a toaster with circuit safety protection according to the present invention;

FIG. 2 is an exploded view of the inside of a toaster with circuit safety protection according to the present invention;

FIG. 3 is a schematic diagram of the crane and the two pole switch trigger circuit of the present invention being closed;

fig. 4 is a schematic diagram of the control circuit of the present invention.

Description of reference numerals: 1-base, 11-double-pole switch, 12-control circuit board, 13-three-pole electric system, 14-electromagnet assembly, 141-electromagnet core, 142-first coil, 143-insulating seat, 144-first switch element, 145-second coil, 15-push rod assembly, 151-cylinder, 152-third switch element, 2-movement, 21-heating piece, 22-reset spring, 23-lifting frame, 24-poking rod, 25-temperature sensor, 26-handle, 3-shell, 4-operation knob and 5-indicator light.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, so to speak, as communicating between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Example one

As shown in fig. 1-4, the toaster with circuit safety protection of the present invention comprises a base 1 and a core 2 arranged on the base 1, wherein a plurality of heating sheets 21 are arranged in the core 2, a lifting frame 23 is connected in the core 2 through a return spring 22, the lifting frame 23 is used for inserting bread into or keeping away from among the plurality of heating sheets 21, and a driving lever 24 is arranged on the lifting frame 23; the base 1 is also provided with a double-pole switch 11 and a control circuit board 12, the control circuit board 12 is connected with a power supply and a heating sheet 21, the control circuit board 12 is provided with a three-pole electric system 13, a deflector rod 24 is matched with one of the three-pole electric system 13, and the double-pole switch 12 is matched with the other two of the three-pole electric system 13; an electromagnet assembly 14 and a push rod assembly 15 are arranged below the double-pole switch 12, the electromagnet assembly 14 and the push rod assembly 15 are both electrically connected with the control circuit board 12, and the electromagnet assembly 14 and the push rod assembly 15 are both used for controlling the on-off of the double-pole switch 12 and the three-pole electric system 13. The invention can quickly disconnect the double-pole switch 12 when the toaster is overheated or the circuit is in failure, thereby avoiding the influence of abnormal conditions such as the clamping of the lifting frame 23 and the like and realizing the multiple power-off protection of the circuit.

In practical application, the applicant notices that the existing electric toaster has a great potential safety hazard, and particularly, after the electric toaster is used for a long time, the lifting frame 23 is blocked easily due to old parts such as the return spring 22 and the like, and the double-pole switch 12 cannot be powered off in time. The double-pole switch 12 is controlled by arranging the electromagnet assembly 14 and the push rod assembly 15, multiple protection is realized by circuit control and mechanical control, the double-pole switch 12 can be forced to rebound, wherein the double-pole switch 12 is respectively positioned on a live wire and a zero wire, and the electric system corresponding to the deflector rod 24 is the live wire. And the branch circuits of the control electromagnet assembly 14 and the push rod assembly 15 are different, once a fault occurs, the chip on the control circuit board 12 sends out a power-off signal, and even if one branch circuit fails, the other branch circuit can break the circuit in time.

In this embodiment, the electromagnet assembly 14 includes an electromagnet core 141 and a first coil 142 wound around the electromagnet core 141, the electromagnet core 141 is fixed on the base 1 through an insulating seat 143, and the double pole switch 11 is attracted to the electromagnet core 141 through magnetic force; the first coil 142 is connected in series with at least two first switching elements 144, and control terminals of the first switching elements 144 are connected to the control circuit board 12 through control branches, respectively. As shown in fig. 4, P1 is connected to the first coil 142 for forming an electromagnet with current controllable magnetism with the electromagnet core 141, and the first switching element 144 is a normally closed switch, for example, configured as a triode, with its control terminal connected to a pin of the chip, and different first switching elements 144 are connected by different branches. When the bread machine accomplishes the heating according to the time, except that the crane 23 that kick-backs and the broken circuit, can signal simultaneously and let double pole switch 11 disconnection, even crane 23 chucking can't kick-back or break down like the situation such as heating time overlength, partial short circuit of internal circuit, also can break off the connection with the power through double pole switch 11, and the setting of two at least first switch element 144, can guarantee to work as one of them branch road trouble, another branch road also can control the disconnection of corresponding first switch element 144, and then realize the outage operation, let electromagnet core 141 lose magnetism, double pole switch 11 receives the resilience of elastic component such as spring and breaks off the main circuit.

In this embodiment, in addition to the electromagnet assembly 14 performing the magnetic attraction power-off operation by using the above circuit principle, the push rod assembly 15 further comprises an air cylinder 151, the air cylinder 151 is connected with a third switch element 152, and a control end of the third switch element 152 is connected with the control circuit board 12; when the double-pole switch 11 needs to be jacked up, the control circuit board 12 controls the third switch element 152 to be switched on, so that the air cylinder 151 jacks up the double-pole switch 11. As shown in fig. 4, the cylinder 151 is connected to the P2, the third switch element 152 is a normally open switch, or a triode or the like may be used, and the control terminal thereof is connected to the chip through a branch, when a fault occurs, for example, a power-off signal is sent, but the power supply is not disconnected all the time, which proves that a fault such as a short circuit or a circuit break occurs in the internal circuit, the chip sends a signal to the third switch element 152 to make the branch connected, so that the cylinder 151 jacks up the push rod, and the double pole switch 11 is disconnected, so that when the lifting frame 23 is pressed down again to start the bread maker, the branch is connected, the fault is not eliminated, and the cylinder 151 jacks up the double pole switch 11 all the time, thereby preventing the user from making circuit connection again without knowing the situation, and reducing the safety risk of circuit burnout or even firing.

In this embodiment, a notch is formed in the bottom of the base 1 corresponding to the position of the push rod assembly 15, and the notch is used for jacking the push rod assembly 15, so as to disconnect the double-pole switch 11 from the three-pole electric system 13. In order to avoid further influence of chip failure and the like, an emergency protection device for manual power-off of a user is reserved on the base 1, the air cylinder 151 can slide up and down, the air cylinder 151 jacks up to be lengthened when the air cylinder is started, and the operation of disconnecting the double-pole switch 11 under the control of a circuit is not influenced. When all the protection is disabled and it is inconvenient to contact with dangerous sources such as power lines, the user can also jack up the cylinder 151 of the push rod assembly 15 by inserting an insulating rod member such as a toothpick through the notch, thereby disconnecting the double pole switch 11.

In the present embodiment, a temperature sensor 25 is provided in the movement 2, and the temperature sensor 25 is connected to the control circuit board 12. The temperature sensor 25 is a NTC thermistor, which is a thermistor material with negative temperature coefficient and with exponential resistance decreasing with temperature rise, and is a semiconductor ceramic formed by fully mixing, molding, sintering and other processes of two or more metal oxides of manganese, copper, silicon, cobalt, iron, nickel, zinc and the like.

In the embodiment, a clamping position matched with the lifting frame 23 is arranged on the base, and when the lifting frame 23 is pressed down to the limit position, the double-pole switch 11 is pressed down and is communicated with the three-pole electric system 13; when the lifting frame 23 rebounds and is clamped in the clamping position, a space is reserved between the lifting frame 23 and the double-pole switch 11 in a free state. When the user normally uses, all can start through the pushing down of crane 23, and then push down simultaneously that double pole switch 11 makes the internal circuit circular telegram, utilize magnetic force to adsorb double pole switch 11, crane 23 kick-backs and goes into the screens, nevertheless driving lever 24 still makes and corresponds the electric system closed, but so can break off double pole switch 11 when the trouble takes place fast, lets double pole switch 11 bounce and can not be spacing by crane 23. In addition, the outer side of the core 2 is wrapped by the shell 3, the lifting frame 23 is provided with a handle 26, the handle 26 penetrates through the core 2 and extends to the outer side of the shell 3, the handle 26 is convenient for a user to control, and the lifting frame 23 can be pulled up through the handle 26 to finish heating in advance.

In this embodiment, the housing 3 is further provided with an operation knob 4 and an indicator lamp 5, and both the operation knob 4 and the indicator lamp 5 are electrically connected to the control circuit board 12. As shown in fig. 1 and 4, the operation knob 4 is disposed on the housing 3 and corresponds to the control circuit to adjust the left, middle and right heating points, and corresponds to three heating modes, and the three heating modes connected to the chip respectively send out corresponding turn-on signals through the pins 1, 2 and 3, which are displayed for the user by the indicator lamp 5, i.e., the LED1, the LED2 and the LED3 in the circuit. Further, control circuit board 12 is the PCB circuit board, and control circuit board 12 is vertically inserted and is established on base 1 to be located between core 2 and the shell 3, set up the slot of looks adaptation through base 1, make things convenient for control circuit board 12 fixed, can let three sword electric system 13 just set up in control circuit board 12 rear side simultaneously, in order to correspond driving lever 24 and double-pole switch 11.

Example two

In this embodiment, different from the first embodiment, the double-pole switch 11 has permanent magnetism, the electromagnet assembly 14 further includes a second coil 145 wound outside the electromagnet core 141, the second coil 145 is located on the upper layer of the first coil 142, and the winding direction of the second coil 145 is opposite to that of the first coil 142; the second coil 145 is connected to a second switching element, and a control terminal of the second switching element is connected to the control circuit board 12. The second coil 145 may be connected to a branch such as P2 in fig. 4, and the cylinder 151 of the push rod assembly 15 may be connected and activated in other ways, so that the cylinder 151 may be controlled by a small circuit for additional power distribution to disconnect the double pole switch 11 when the chip is completely failed. The second switch element is also a normally open switch, such as a triode, and its branch is only started after P1 fails, so that the second switch element is turned on, and further the second coil 145 generates opposite current relative to the first coil 142, so that the electromagnet core 141 has magnetic force with opposite magnetic poles, and since the double pole switch 11 is a magnet with permanent magnetism, it is attracted in opposition to the magnetic field formed by the first coil 142, when the second coil 145 works, forming the same magnetic field as the double pole switch 11, the double pole switch 11 is repelled and kept away, and rebounded by the elastic member, the double pole switch 11 will not be attracted to the electromagnet core 141.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse explanation, these directional terms do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present application.

In the drawings, the positional relationship is described for illustrative purposes only and is not to be construed as limiting the present patent; it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.