JP2005087571A - Food processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a food processor, in which an overload protection device operates by not only current values but also temperature rise in an overload state, and a circuit breaks by detecting temperature of a motor in the case that the overload is applied with a small current value in a rotational speed control method using a diode. <P>SOLUTION: A cutter 7 is provided in a cylindrical glass cup 1. The motor 4 is provided inside of a body 2. The motor 4 is driven by operating of a switch 5 and the cutter 7 associating with the motor 4 is rotated, so that material in the glass cup 1 is cut. When overload is applied to the motor 4, the overload protection device 8 operates when a specified or higher current flows in a specified or longer period of time. The overload protection device 8 is arranged near a part where temperature of the motor 4 rises at the time of overload, so that it operates not only by rising of the current value but also by detecting the temperature rise of the motor 4 at the time of the overload or the like in order to break current to the motor 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric cooker such as a general household mixer.

A conventional electric cooker of this type is generally configured as shown in FIG. (See Patent Document 1)
In FIG. 5, a cutter 24 is provided inside a cylindrical glass cup 23, an electric motor 22 is provided inside the main body 21, and a switch 25 is provided on the upper surface of the main body 21. By operating this switch 25, the cutter 24 interlocked with the electric motor 22 rotates, and the material in the glass cup 23 is stirred and cut.

  At this time, when the material to be cut is a load heavier than the specified material, the current flowing through the motor 22 increases, and thus the overload protection device 20 detects this current and blocks the current to the motor 22. Has been.

  When the overload protection device 20 operates, the reset lever (not shown) is operated to return the overload protection device 20 so that it can be used again.

  Since this overload protection device 20 is provided in the main body 21 away from the electric motor 22, a bimetal (not shown) is provided in the overload protection device 20 that generates heat when current is passed. Even if there is an overload, it will only operate if the current flowing to the motor 22 increases, and if overload current does not reach a certain time for a certain period of time, such as overload, The protection device 20 has a structure that does not work.

  In particular, in a product in which the current is reduced by a diode or the like as disclosed in Japanese Patent Laid-Open No. 2002-306350 (see Patent Document 2), the increase in the current value is reduced even during an overload. However, even in such a product, the overload protection device 20 is provided apart from the electric motor 22 inside the main body 21.

JP 59-186531 A

JP 2002-306350 A

  In such a conventional structure, the overload protection device does not work in an overload state where the overload current does not reach a certain level or more when the mixer is used, and it can detect even if the temperature of the motor rises. In the end, there was a case where the electric motor smoked.

  Especially when stirring thick sticky materials such as yam, the current value at the initial overload is low, and when the viscosity gradually increases, the current value gradually increases. The current value is not enough to activate the load protection device, and only the motor temperature rises without the overload protection device functioning. The holder that holds the brush part that supplies power to the child deforms and the brush does not move, and it is impossible to supply electricity from the brush to the rotor. Due to heat generation, the varnish portion and the binding band portion of the coil smoked, and in the worst case, the phenomenon of melting even the plastic body supporting the electric motor occurred.

  In addition, in a product with a mechanism that adjusts the rotation speed by reducing the current with a diode, etc., the current value does not rise so much even during overload, etc., so the overload protection device does not work and the motor rises in temperature. It was. For this reason, even when the temperature of the motor is abnormally rising, the rotation does not stop and reaches the smoke generation state. There was a very inconvenient structure.

  The present invention has been made in order to solve the above-described problems, and a cutter is provided in a cylindrical glass cup, and an electric motor is provided inside the main body. The electric motor is driven by the operation of the switch to become an electric motor. In an electric cooker in which the interlocked cutter rotates and the material in the glass cup is cut, when an overload is applied to the motor, the overcurrent that operates when a current of a certain current or more flows for a certain period of time or more. A load protection device is provided in the vicinity of the portion where the temperature of the motor rises during overload, and the overload protection device not only operates by increasing the current value, but also by detecting the temperature rise of the motor during overload, etc. Is also operated to cut off the current passing through the motor.

  Further, as a specific means, in claim 2, the overload protection device is fixed so as to be in contact with a part of the end bracket located on the outer shell of the motor, and the overload protection device is detected by detecting the outer temperature of the motor. It is made to operate and cut off the current that leads to the electric motor.

  Further, in claim 3, the overload protection device is fixed so as to be wound around the most heated stator side coil in the motor, and the overload protection device is operated by directly detecting the coil temperature of the motor, The electric current that leads to the electric motor is cut off.

  According to a fourth aspect of the present invention, the overload protection device is fixed in close contact with the flat portion of the iron core that can secure the flat portion inside the motor, and the overload protection device is operated by detecting the coil temperature of the motor at the flat portion. In this way, the current passing through the electric motor is cut off.

  Furthermore, in claim 5, a diode and a switch for reducing the rotational speed by half-wave rectification are provided in series with the electric motor, the temperature of the electric motor is detected, the overload protection device is operated, and the current passing through the electric motor is cut off. It is a thing.

  As described above, according to the present invention, when an overload state occurs when the mixer is used, the overload protection device can be operated regardless of the current value or the temperature rise of the motor, so that it can be used as a more reliable protection device.

  In particular, in a control product using a diode, even when an overload occurs in a state where the current value is small, the temperature of the motor can be detected and the circuit can be cut off, and the motor does not rotate due to a temperature rise. In addition, smoke and melting are not caused by the temperature rise, and the product can be made extremely safe.

  For this reason, the product can be protected with an overload protection device even if it is used incorrectly on the user side, and it can be reused by pressing the reset lever again, thus providing an excellent electric cooker that is very easy to use. It is possible to obtain a very large effect.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an overall cross-sectional view of an electric cooker according to an embodiment of the present invention, FIG. 2 is an overall cross-sectional view of an electric cooker according to another embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a circuit diagram of an electric cooker according to an embodiment of the present invention.

  In the figure, 1 is a cylindrical glass cup, and 2 is a main body. A cutter base 3 is detachably provided at the lower part of the glass cup 1, an electric motor 4 is provided inside the main body 2, and a switch 5 is provided on the upper surface of the main body 2. By operating this switch 5, the electric motor 4 is energized, the electric motor 4 and the coupling 6 to be connected rotate, and further, a material-cutting material provided rotatably at the center of the cutter base 3 connected to the coupling 6. The material in the glass cup 1 is stirred and cut by the cutter 7 to make liquid drinks.

  In this structure, if the amount of the material in the glass cup 1 is large at the time of cutting when making a drink or the like, or if the shape of the material cutting in the pre-cooking work is too large, the motor 4 is overloaded. When a current flows for a certain time or more when a rotation starts, a bimetal (not shown) in the overload protection device 8 connected in series to the motor 4 generates heat due to the overcurrent, and the bimetal Is reversed, the contact is opened, and the current to the motor 4 is interrupted.

  Here, the position where the overload protection device 8 is provided is preferably a portion where the temperature rises simultaneously when the temperature of the motor 4 rises. For example, as shown in FIG. Or, there is an iron core 12 as shown in 8 (A), or in the stator side coil 11 as shown in 8 (C). By providing in this way, the overload protection device 8 can directly catch the temperature rise due to the overload of the electric motor 4, and even if the temperature rises, the bimetal inside reversely operates to open the contact, leading to the electric motor 4. It is the structure which interrupts | blocks an electric current.

  FIG. 4 is a circuit of an electric cooker that realizes both high-speed rotation and low-speed rotation. A switch in which two switching contacts 5a and 5b are connected in parallel to one end of a power supply 14 via an overload protection device 8, respectively. 5, a diode 9 is connected to the switching contact 5 a, the motor 4 is connected in series to the switch 5, and the other end of the motor 4 is connected to the power source 14.

  Next, the operation of this embodiment will be described.

  First, when a material is put into the glass cup 1 and placed on the main body 2 and the switch 5 is operated, the electric motor 4 is energized, and the cutter 7 rotates via the coupling 6. Due to the rotation of the cutter 7, the material is cut while being rotationally stirred to form a liquid drink.

  In this state, if the amount of the material in the glass cup 1 is large at the time of cutting when making a drink or the like, or if the shape of the material cutting in the pre-cooking work is too large, the motor 4 is overloaded. Is applied, and when the current flows for a certain constant time or more at a certain time at the start of rotation, the overload protection device 8 connected in series to the motor 4 operates to cut off the current to the motor 4.

  Further, as shown in FIG. 4, it has a circuit configuration in which current is supplied to the motor 4 through the two switching contacts 5a and 5b. In addition to the normal high-speed rotation, half-wave rectification is performed through the switching contact 5a and the diode 9 to perform low-speed rotation. In the product that realizes the above, since the current flowing to the motor 4 is reduced due to the half-wave rectification, the overload protection device 8 detects an increase in the current value even if the stirring material is excessive and the overload state occurs. May not continue to overload. Even in this case, according to the present invention, the temperature rise of the motor 4 causes the overload protection device 8 located in the vicinity of or inside the motor 4 to operate and open the contact, so that the abnormal temperature rise of the motor 4 can be prevented. This can prevent smoke and dissolution.

  Further, the bimetal of the overload protection device 8 is reversed again when the electric motor 4 returns to the normal temperature and returns to the normal state. Therefore, when the reset lever 13 is pressed, the contact of the overload protection device 8 is closed again. The electric motor 4 can be rotated.

  Thus, according to the above structure, the overload protection device 8 can be operated by the current value or temperature rise of the electric motor 4 when an overload state occurs when the mixer is used, and therefore, it is used as a more reliable protection device. be able to. For this reason, although it is viscous but the initial current is not so high, the circuit can be shut off by temperature detection when the electric motor 4 generates heat even in stirring.

  Further, when the overload protection device 8 is fixed to the portions 8 (A), 8 (B), and 8 (C) of the electric motor 4, the abnormal temperature of the electric motor 4 is directly and accurately detected to detect the electric motor 4. The circuit can be interrupted.

  In addition, even in a product having a structure in which the number of revolutions is controlled by half-wave rectification using a diode 9, even if the current value is small, the motor 4 itself rises in temperature due to overload, so that the overload protection device 8 is detected by temperature detection. The circuit of the electric motor 4 can be cut off, and an easy-to-use mixer excellent in safety can be provided.

The sectional view of the whole electric cooker at the time of mixer function use by one example of the present invention. Sectional drawing of the whole electric cooker by other one Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the electric motor part of one Example of this invention. The circuit diagram of the electric cooker by one Example of this invention. Sectional drawing of the whole electric cooker of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Glass cup 2 ... Main body 4 ... Electric motor 5 ... Switch 7 ... Cutter 8 ... Overload protection device 9 ... Diode 10 ... End bracket 11 ... Fixed Child coil 12 ... Iron core

Claims (5)

A cutter (7) is provided in a cylindrical glass cup (1), an electric motor (4) is provided inside the main body (2), and the electric motor (4) is driven by the operation of the switch (5). In the electric cooker in which the cutter (7) linked to (4) rotates and the material in the glass cup (1) is cut, when an overload is applied to the electric motor (4), a current exceeding a certain constant current However, an overload protection device (8) that operates when it has flowed for a certain period of time is provided in the vicinity of the portion where the temperature of the electric motor (4) rises during overload, and the overload protection device (8) An electric cooker characterized by not only operating due to an increase, but also operating by detecting a temperature increase of the electric motor (4) during an overload or the like, and cutting off a current passing through the electric motor (4). The overload protection device (8) is fixed so as to be in contact with a part of the end bracket (10) located on the outer periphery of the electric motor (4), and detects the outer temperature of the electric motor (4) to detect the overload protection device (8 The electric cooker according to claim 1, wherein the electric current to the electric motor (4) is interrupted. The overload protection device (8) is fixed so as to be wound around the most heated stator side coil (11) inside the electric motor (4), and directly detects the coil temperature of the electric motor (4) to protect against overload. Electric cooker according to claim 1, characterized in that the device (8) is operated and the current leading to the electric motor (4) is interrupted. The overload protection device (8) is fixed in close contact with the flat portion of the iron core (12) where the flat portion can be secured inside the electric motor (4), and the coil temperature of the electric motor (4) is detected by the flat portion. The electric cooker according to claim 1, characterized in that the load protection device (8) is operated to cut off a current passing through the electric motor (4). A diode (9) in series with the motor (4) and a switch (5) for reducing the rotational speed by half-wave rectification are provided, the temperature of the motor (4) is detected, and the overload protection device (8) is operated. The electric cooking device according to claim 1, wherein the electric current leading to the electric motor is cut off.

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