CN204764184U

CN204764184U - Chafing dish desk

Info

Publication number: CN204764184U
Application number: CN201520390971.1U
Authority: CN
Inventors: 林碧琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-06-09
Filing date: 2015-06-09
Publication date: 2015-11-18
Anticipated expiration: 2025-06-09

Abstract

The utility model provides a chafing dish desk, including a platform and a table leg, the table leg setting is under the table platform, and a table bench face is provided with electromagnetism furnace body and glass face, is provided with the button by the table platform, the button is used for controlling the work of electromagnetism furnace body, be provided with the light guide plate between glass face and the furnace body, the income light side of light guide plate is provided with red emitting diode, interior 555 time base chip and the thermistor of including of furnace body, and thermistor sets up below the glass face positive middlely, thermistor's resistance risees and diminishes along with the temperature, and thermistor's one end is connected with the one end of first resistance and 555 time base chip's discharge end. The utility model discloses can remind the surperficial temperature of electromagnetism chafing dish table, have simple structure simultaneously, need not program code, the easy advantage that realizes.

Description

A kind of chafing dish desk

Technical field

The utility model relates to the sub-field of table with electromagnetic heater for chaffy dish, particularly relates to a kind of chafing dish desk.

Background technology

The chafing dish desk of existing electromagnetic type, can be very boiling hot on the surface of face glass after worked, and the ignorant words of user, handle puts up and is easy to scald, and needs there being the situation of temperature to carry out suitable temperature-prompting.

Summary of the invention

The technical problems to be solved in the utility model, is to provide a kind of chafing dish desk, and solving existing chafing dish desk can not the problem of reminding user when there being temperature.

The utility model is achieved in that a kind of chafing dish desk, comprise tables and table leg, under table leg is arranged on tables, electromagnetic oven body and glass surface is provided with above tables, tables side is provided with button, described button is for controlling electromagnetic oven body work, light guide plate is provided with between described glass surface and body of heater, the incident side of described light guide plate is provided with red light emitting diodes, base chip and thermistor when comprising 555 in body of heater, thermistor is arranged on middle below glass surface, the resistance of described thermistor raises with temperature and diminishes, when one end of thermistor and one end of the first resistance and 555, the discharge end of base chip is connected, the other end of the first resistance and 555 time base chip reset terminal, the power positive end of base chip when 555, one end of second resistance is connected with power supply, the other end of thermistor and one end of electric capacity, when 555 base chip low triggering end with 555 time base chip high-triggering end be connected, the other end of electric capacity, the power supply negative terminal of base chip when 555, the minus earth of red light emitting diodes, the positive pole of red light emitting diodes with 555 time the output of base chip and the other end of the second resistance be connected.

The utility model tool has the following advantages: can realize the prompting to chafing dish desk temperature, and structure is simple, without the need to program code, easily realizes.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the structural representation of electromagnetic oven body of the present utility model, glass surface and light guide plate;

Fig. 3 is circuit diagram of the present utility model.

Detailed description of the invention

By describing technology contents of the present utility model, structural feature in detail, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with embodiment.

Refer to Fig. 1 to Fig. 3, the utility model provides a kind of chafing dish desk, comprise tables 10 and table leg 11, under table leg is arranged on tables, electromagnetic oven body 1 and glass surface 2 is provided with above tables, tables side is provided with button 12, described button is for controlling electromagnetic oven body work, light guide plate 3 is provided with between described glass surface and body of heater, the incident side of described light guide plate is provided with red light emitting diodes 4, base chip NE555 and thermistor when comprising 555 in body of heater, temperature-sensitive 5 resistance is arranged on middle below glass surface, the resistance of described thermistor raises with temperature and diminishes, when one end of thermistor RD1 and one end of the first resistance R1 and 555, the discharge end of base chip is connected, the other end of the first resistance and 555 time base chip reset terminal, the power positive end of base chip when 555, one end of second resistance R2 is connected with power supply, the other end of thermistor and one end of electric capacity, when 555 base chip low triggering end with 555 time base chip high-triggering end be connected, the other end of electric capacity, the power supply negative terminal of base chip when 555, the minus earth of red light emitting diodes D1, the positive pole of red light emitting diodes with 555 time the output of base chip and the other end of the second resistance be connected.

Operation principle of the present utility model is as follows: electric capacity C1 can be charged by R1, RD1, and is discharged by RD1, and dutycycle is controlled by R1 and RD1, and the discharge and recharge of electric capacity C1 repeats between VCC/3 and 2VCC/3, and VCC is power supply voltage, process analysis procedure analysis:

1. initial capacitance voltage is a little less than VCC/3, now exports high level, and discharge end is closed, and VCC is to capacitor charging time constant 0.693 (R1+RD1) C; C is the value of electric capacity C1.

2. be charged to a little more than VCC/3, high level before exporting maintenance with reference to truth table, discharge end is closed, and VCC is to C charge constant 1/ (R1+RD1) C.

3. be charged to a little more than 2VCC/3, output low level, discharge switch is opened, capacitor discharge time constant 1/RD1*C.

4. discharge into a little less than 2VCC/3, enter maintenance state, capacitor discharge time constant 0.693RD1*C;

5. discharge into and enter 1 a little less than VCC/3, and start circulation.

Particularly, high level time: the time of VCC/3 to the 2VCC/3 that charges through R1, RD1; Low level time: the time discharging into VCC/3 through RD1 from 2VCC/3; Cycle is 0.693 (R1+2RD1) C, dutycycle 1-RD1/ (R1+2RD1).Namely along with the rising of glass surface temperature, the resistance of thermistor constantly declines, and brings dutycycle constantly to rise, thus the brightness of red light emitting diodes is brighter, and user can see brighter redness from light guide plate.User sees that namely brighter redness can know that Current Temperatures rises, as see burn red iron just can know iron very boiling hot, realize the prompting to temperature.Structure is simple, cost is low, also facilitates illiterate people to understand the height of temperature simultaneously.

The foregoing is only embodiment of the present utility model; not thereby scope of patent protection of the present utility model is limited; every utilize the utility model description and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims

1. a chafing dish desk, it is characterized in that: comprise tables and table leg, under table leg is arranged on tables, electromagnetic oven body and glass surface is provided with above tables, tables side is provided with button, described button is for controlling electromagnetic oven body work, light guide plate is provided with between described glass surface and body of heater, the incident side of described light guide plate is provided with red light emitting diodes, base chip and thermistor when comprising 555 in body of heater, thermistor is arranged on middle below glass surface, the resistance of described thermistor raises with temperature and diminishes, when one end of thermistor and one end of the first resistance and 555, the discharge end of base chip is connected, the other end of the first resistance and 555 time base chip reset terminal, the power positive end of base chip when 555, one end of second resistance is connected with power supply, the other end of thermistor and one end of electric capacity, when 555 base chip low triggering end with 555 time base chip high-triggering end be connected, the other end of electric capacity, the power supply negative terminal of base chip when 555, the minus earth of red light emitting diodes, the positive pole of red light emitting diodes with 555 time the output of base chip and the other end of the second resistance be connected.