MCH heater

Abstract

We provide MCH heaters that improve heat generation, realize wideband voltage design, and achieve serious dual voltage control. [Solution] A new process MCH heater including an upper layer ceramic body 1 and a lower layer ceramic body 5 in which an electrode groove 1 for circumscribing a lead wire is provided, a middle spacer layer ceramic body 3 is provided between the upper layer ceramic body and the lower layer ceramic body, an upper layer plate resistance wire 2 formed by printing and sintering tungsten paste is provided on one side of the upper layer ceramic body close to the middle spacer layer ceramic body, a lower layer plate resistance wire 4 formed in a similar manner is provided on one side of the lower layer ceramic body close to the middle spacer layer ceramic body, a first electrode and a second electrode are respectively provided at two joints of a first heating line, and a first electrode and a third electrode are respectively provided at two joints of a second heating line, and an electrode groove 2 matching the electrode groove 1 is provided in the middle spacer layer ceramic body.

Description

[Technical field]

[0001] The present invention relates to the field of hair straightening technology, and more particularly to MCH heaters. [Background technology]

[0002] MCH (Metal Ceramics Heater) is a ceramic heating element, which heats up quickly, is fire-free, durable, and resistant to acids and alkalis. Hair straighteners use the principle of thermal denaturation of protein to straighten hair, so a high-quality hair straightener needs a heating element with excellent performance. MCH has a very wide application in the field of hair straighteners. MCH is made by printing resistive paste on a ceramic substrate and sintering it together, then drawing out metal leads on both ends of the resistive paste, and the current flows through the alloy tungsten paste to quickly generate high temperature and heat the hair straightener.

[0003] In actual use, the voltage of the power grid in each country is different, such as AC100V or AC240V. When the resistance is specified, the power differs depending on the voltage, so the MCH in the hair straightener is basically used at a specified voltage. When manufacturers sell to different countries and regions, they will select MCHs with different resistance values, and the specifications of the MMCH cannot be integrated, which makes it inconvenient for large-scale production and high production costs.

[0004] Some hair straightener manufacturers produce products that use the so-called global voltage through circuit control, but the MCH heats up quickly and can reach over 700 degrees Celsius in 10 seconds, posing a huge potential safety hazard. Hair straighteners are used to style people's hair, and once the temperature goes out of control, it is easy to burn the hair due to the high temperature. Summary of the Invention [Means for solving the problem]

[0005] In response to the above technical problem, the present invention provides an MCH heater including an upper ceramic body and a lower ceramic body in which an electrode groove 1 for circumscribing a lead wire is provided, a middle spacer layer ceramic body is provided between the upper ceramic body and the lower ceramic body, an upper plate resistance wire formed by printing and sintering tungsten paste on one surface of the upper ceramic body close to the middle spacer layer ceramic body, and a lower plate resistance wire formed by printing and sintering tungsten paste on one surface of the lower ceramic body close to the middle spacer layer ceramic body, the upper plate resistance wire and the lower plate resistance wire both include a first heating line, a second heating line, a first electrode, a second electrode and a third electrode, the first electrode and the second electrode are respectively provided at two joints of the first heating line, and the first electrode and the third electrode are respectively provided at two joints of the second heating line.

[0006] Furthermore, an electrode groove 2 matching with the electrode groove 1 is provided in the middle spacer layer ceramic body, the electrode groove 1 and the electrode groove 2 are each provided in threes, and the first electrode, the second electrode and the third electrode are respectively provided in the corresponding electrode grooves.

[0007] Furthermore, the first heating line and the second heating line are formed by printing and sintering tungsten pastes of different types or different mixing ratios, and the first heating line and the second heating line have different resistance values.

[0008] Furthermore, a silk-screen printing layer 1 that matches the upper ceramic body and the upper plate resistance wire is printed by silk screen on one side of the middle spacer layer ceramic body close to the upper plate resistance wire, and a silk-screen printing layer 2 that matches the lower plate resistance wire and the lower ceramic body is printed by silk screen on one side of the middle spacer layer ceramic body close to the lower plate resistance wire.

[0009] Furthermore, the projections of the lower plate resistance wire and the heating lines in the lower ceramic body overlap in the thickness direction, improving the uniformity of heat generation.

[0010] Furthermore, the densities and lengths of the heating lines in the lower plate resistance wire and the lower ceramic body are different, so that different heating effects can be obtained.

[0011] Furthermore, the first electrodes of the upper plate resistance wire and the lower plate resistance wire are both connected to an circumscribing lead wire A, the second electrodes of the upper plate resistance wire and the lower plate resistance wire are both connected to an circumscribing lead wire B, and the first electrodes of the upper plate resistance wire and the lower plate resistance wire are both connected to an circumscribing lead wire C.

[0012] Further, the control circuit further comprises: an AC input circuit for receiving alternating current from a power grid or an external power source; a voltage sampling unit for monitoring the input voltage of the AC input circuit and feeding back the information to the MCU control unit to ensure the stability of the power supply; A 5V switched power supply circuit converts AC current to DC current and provides a stable 5V output voltage for use by other modules. The TR1 / TR2 switches are used to control the direction and magnitude of current flow, a microcontroller or MCU control unit for receiving information of the voltage sampling unit and controlling the TR1 and TR2 switches to regulate the power supply; Here, if the voltage sampling unit detects that the voltage of the currently used power grid or external power source is 100VAC, the MCU control unit can be used to turn on TR1 and turn off TR2; If the voltage sampling unit detects that the voltage of the currently used power grid or external power source is 240VAC, the MCU control unit can be used to turn on TR2 and turn off TR1; a display unit for displaying current status information to a user; and a three-terminal MCH resistive sampling circuit for measuring the current strength and monitoring and controlling by the MCU. Effect of the Invention

[0013] The present invention has the following beneficial effects compared with the prior art: (1) the present invention prints heating circuits on both the upper and lower ceramic bodies, realizing that both sides can generate heat and improving the amount of heat; (2) the MCH of the present invention adopts a new "sandwich" type printing process and sintering, and selects a high resistance MCH for the high voltage circuit and a low resistance MCH for the low voltage area, so that one MCH can select two resistance values, effectively ensuring the safety of users when using hair straighteners, and enabling MCH manufacturers to standardize production and improve productivity; (3) the present invention changes the traditional voltage control method of hair straightener design, realizing true dual voltage control; (4) the present invention, combined with the temperature control method of hair straighteners, easily realizes a wide-band voltage design of global voltage AC100V~AC240V. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a schematic diagram of the heater explosion structure of the present invention; [Diagram 2] 1 is a schematic diagram of the overall structure of a heater according to the present invention; [Diagram 3] FIG. 2 is a block diagram of the MCH hair straightener of the present invention. [Figure 4] 1 is a diagram of an MCH control circuit according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be further described below with reference to specific embodiments, and the exemplary embodiments and descriptions of the present invention are for the purpose of illustrating the present invention, but are not intended to limit the present invention.

[0016] In the embodiment, the MCH heater includes an upper ceramic body 1 and a lower ceramic body 5 in which an electrode groove 1 for circumscribing a lead wire as shown in FIG. 1 is provided. A middle spacer layer ceramic body 3 is provided between the upper ceramic body 1 and the lower ceramic body 5. An upper plate resistance wire 2 is provided by printing and sintering tungsten paste on one surface of the upper ceramic body 1 close to the middle spacer layer ceramic body 3. A tungsten paste is printed and sintered on one surface of the lower ceramic body 5 close to the middle spacer layer ceramic body 3. a lower plate resistance wire 4 formed by the above-mentioned process is installed, and the upper plate resistance wire 2 and the lower plate resistance wire 4 both include a first heating line, a second heating line, a first electrode, a second electrode and a third electrode, the first electrode and the second electrode are respectively installed at two joints of the first heating line, the first electrode and the third electrode are respectively installed at two joints of the second heating line, an electrode groove 2 matching with the electrode groove 1 is installed in the middle spacer layer ceramic body 3, there are three electrode grooves 1 and 2 each, and the first electrode, the second electrode and the third electrode are respectively installed in the corresponding electrode grooves.

[0017] The first electrodes of the upper plate resistance wire 2 and the lower plate resistance wire 4 are both connected to the circumscribing lead wire A, the second electrodes of the upper plate resistance wire 2 and the lower plate resistance wire 4 are both connected to the circumscribing lead wire B, and the first electrodes of the upper plate resistance wire 2 and the lower plate resistance wire 4 are both connected to the circumscribing lead wire C, so that both layers can be heated and the heat generation amount is improved. The first heating line and the second heating line are formed by printing and sintering tungsten paste of different types or different composition ratios, and the first heating line and the second heating line have different resistance values, for example, the resistance value of lead wire A and lead wire B is 25 ohms, and the resistance value of lead wire A and lead wire C is 50 ohms.

[0018] A silk screen printing layer 1 that matches the upper ceramic body 1 and the upper plate resistance wire 2 is printed by silk screen on one side of the middle spacer layer ceramic body 3 close to the upper plate resistance wire 2, and a silk screen printing layer 2 that matches the lower plate resistance wire 4 and the lower ceramic body 5 is printed by silk screen on one side of the middle spacer layer ceramic body 3 close to the lower plate resistance wire 4, and the projections of the heating lines in the lower plate resistance wire 4 and the lower ceramic body 5 overlap in the thickness direction, improving the uniformity of heating, and the density and length of the heating lines in the lower plate resistance wire 4 and the lower ceramic body 5 are different, resulting in different heating effects.

[0019] The control circuit for the MCH heater is an AC input circuit for receiving alternating current from a power grid or an external power source; a voltage sampling unit for monitoring the input voltage of the AC input circuit and feeding back the information to the MCU control unit to ensure the stability of the power supply; A 5V switched power supply circuit converts AC current to DC current and provides a stable 5V output voltage for use by other modules. The TR1 / TR2 switches are used to control the direction and magnitude of current flow, a microcontroller or MCU control unit for receiving information of the voltage sampling unit and controlling the TR1 and TR2 switches to regulate the power supply; a display unit for displaying current status information to a user; and a three-terminal MCH resistive sampling circuit for measuring the current strength and monitoring and controlling by the MCU.

[0020] The working principle of this invention is as follows: in the traditional MCH manufacturing process, only one heating line and two electrodes installed on the joint are printed, this invention is based on the traditional MCH manufacturing process, adds one heating line and pulls out one extra lead wire in the middle, users can choose as needed when developing and designing hair straighteners, when AC110V is required, adopt lead wire A and lead wire B, when AC240V is required, adopt lead wire A and lead wire C.

[0021] The specific control method is as follows: when the voltage sampling unit detects that the voltage of the currently used power grid or external power source is 100VAC, it controls the I / O through the MCU control unit to output H3 high level to turn on TR1, turn off TR2, and operate 2-1 in M1 / M2; when the voltage sampling unit detects that the voltage of the currently used power grid or external power source is 240VAC, it controls the I / O through the MCU control unit to output H2 high level to turn on TR2, turn off TR1, and operate 2-1 in M1 / M2, where M1 / M2 is the MCH of the present invention. [Explanation of symbols]

[0022] 1-upper ceramic body, 2-upper plate resistance wire, 3-middle spacer layer ceramic body, 4-lower plate resistance wire, 5-lower ceramic body

Claims

1. an MCH heater including an upper layer ceramic body and a lower layer ceramic body in which an electrode groove 1 for circumscribing a lead wire is provided, wherein a middle spacer layer ceramic body is provided between the upper layer ceramic body and the lower layer ceramic body, an upper plate resistance wire formed by printing and sintering a tungsten paste on one surface of the upper layer ceramic body close to the middle spacer layer ceramic body, and a lower plate resistance wire formed by printing and sintering a tungsten paste on one surface of the lower layer ceramic body close to the middle spacer layer ceramic body, each of the upper plate resistance wire and the lower plate resistance wire includes a first heating line, a second heating line, a first electrode, a second electrode and a third electrode, the first electrode and the second electrode are respectively provided at two joints of the first heating line, and the first electrode and the third electrode are respectively provided at two joints of the second heating line.

2. 2. The MCH heater according to claim 1, wherein the middle spacer layer ceramic body is provided with an electrode groove 2 matching with the electrode groove 1, the electrode groove 1 and the electrode groove 2 are each provided in threes, and the first electrode, the second electrode and the third electrode are respectively provided in the corresponding electrode grooves.

3. 2. The MCH heater according to claim 1, wherein the first heating line and the second heating line are formed by printing and sintering tungsten pastes of different types or different mixing ratios, and the first heating line and the second heating line have different resistance values.

4. 4. The MCH heater according to claim 3, wherein a silk-screen printing layer 1 that matches the upper ceramic body and the upper plate resistance wire is printed by silk screen on one side of the middle spacer layer ceramic body close to the upper plate resistance wire, and a silk-screen printing layer 2 that matches the lower plate resistance wire and the lower ceramic body is printed by silk screen on one side of the middle spacer layer ceramic body close to the lower plate resistance wire.

5. 5. The MCH heater according to claim 4, wherein the projections of the lower plate resistance wire and the heating lines in the lower ceramic body overlap in the thickness direction, improving uniformity of heat generation.

6. 6. The MCH heater according to claim 5, wherein the densities and lengths of the heating lines in the lower plate resistance wire and the lower ceramic body are different from each other to obtain different heating effects.

7. 7. The MCH heater according to claim 6, wherein first electrodes of the upper plate resistance wire and the lower plate resistance wire are both connected to an external lead wire A, second electrodes of the upper plate resistance wire and the lower plate resistance wire are both connected to an external lead wire B, and first electrodes of the upper plate resistance wire and the lower plate resistance wire are both connected to an external lead wire C.

8. The method further includes the step of: an AC input circuit for receiving alternating current from a power grid or an external power source; a voltage sampling unit for monitoring the input voltage of the AC input circuit and feeding back the information to the MCU control unit to ensure power supply stability; A 5V switching power supply circuit for converting AC current to DC current and providing a stable 5V output voltage for use by other modules; A TR1 / TR2 switch for controlling the direction and magnitude of current flow; a microcontroller or MCU control unit for receiving information of the voltage sampling unit and controlling the TR1 and TR2 switches to regulate the power supply; Here, if the voltage sampling unit detects that the voltage of the currently used power grid or external power source is 100VAC, the MCU control unit can be used to turn on TR1 and turn off TR2; If the voltage sampling unit detects that the voltage of the currently used power grid or external power source is 240VAC, the MCU control unit can be used to turn on TR2 and turn off TR1; a display unit for displaying current status information to a user; 2. The MCH heater of claim 1, further comprising: a three terminal MCH resistor sampling circuit for measuring current intensity for monitoring and control by an MCU.

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