CN211270125U

CN211270125U - Food processor safe in utilization

Info

Publication number: CN211270125U
Application number: CN201921100106.3U
Authority: CN
Inventors: 王旭宁; 冯晓丽; 毛树海; 胡望伟
Original assignee: Joyoung Co Ltd
Current assignee: Hangzhou Jiuchuang Home Appliances Co ltd
Priority date: 2019-07-15
Filing date: 2019-07-15
Publication date: 2020-08-18
Anticipated expiration: 2029-07-15

Abstract

The utility model discloses a food processor safe in utilization, including processing chamber, a water tank for holding liquid, a water pump for pumping the liquid in the water tank into the processing chamber, a current detection and drive module for detecting the current of the water pump and driving the water pump to start and stop, and a main control chip for sending a water pump stop control signal and alarming for water shortage when the current of the water pump is the empty pumping current of the water pump, wherein the water pump stop control signal is used for controlling the current detection and drive module to drive the water pump to stop rotating; the water pump is provided with a water inlet and a water outlet, the water inlet is communicated with the water outlet of the water tank, and the water outlet is communicated with the processing cavity; the current detection and drive module is respectively communicated with the water pump and the main control chip. The utility model discloses a food processor does not have the structure of built-in the water tank, reduces water pollution, and simple structure, and the cost is lower.

Description

Food processor safe in utilization

Technical Field

The utility model relates to a kitchen appliances field, more specifically relates to a food preparation machine.

Background

Food processors are typically equipped with an internal water tank to provide a source of water for processing food or processing containers. For example, the automatic water adding noodle maker is provided with a built-in water tank to provide water source for making noodles, and a water pump automatically adds water after flour is added, so that the aim of automatically making noodles is fulfilled. Or, the portable steam products are generally provided with a built-in water tank to provide water source for the evaporator, and steam is generated after heating. When the water in the water tank is lack of water, the noodle making is easy to fail; or the evaporator is dried without water for a long time and can not generate steam. Therefore, it is necessary to detect water shortage in food processing machines including automatic water-adding noodle makers and portable steam products.

At present, the water shortage detection schemes in the market generally have the following two schemes:

1. the float valve is combined with an external magnetic control switch, or a floating ball structure is adopted, the float valve and the floating ball are arranged in the water tank and can float along with the rising and the lowering of the water level, and when the water level is lowered to a certain degree, the magnetic control switch or a related structure gives a switch signal, so that the water shortage alarm is prompted.

2. The capacitive water level sensor has a contact type and a non-contact type, and the principle is that the water level is judged by judging the capacitance value by utilizing the difference of the capacitance detected by the sensor when the water tank is in the presence of water and when the water is not in the presence of water.

However, the above solutions all have the following disadvantages: 1. structures such as a floating stop valve and the like are arranged in the water tank and are in contact with a water source for a long time, so that bacteria are easy to breed and water quality is influenced; 2. the structure is complicated and the cost is high.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a food processor, including the processing chamber, food processor still includes: the water pump device comprises a water tank for containing liquid, a water pump for pumping the liquid in the water tank into the processing cavity, a current detection and drive module for detecting the current of the water pump and driving the water pump to start and stop, and a main control chip for sending a water pump stop control signal and giving a water shortage alarm when the current of the water pump is the water pump idle pumping current, wherein the water pump stop control signal is used for controlling the current detection and drive module to drive the water pump to stop rotating; wherein:

the water pump is provided with a water inlet and a water outlet, the water inlet is communicated with the water outlet of the water tank, and the water outlet is communicated with the processing cavity;

the current detection and drive module is respectively communicated with the water pump and the main control chip.

Further, in the above embodiment, the current detecting and driving module includes: the detection circuit is used for detecting the current of the water pump and comprises a sampling resistor R1;

one end of the R1 is respectively communicated with the water pump and the first detection pin of the main control chip, and the other end of the R1 is connected with a high level;

wherein the voltage drop across R1 is used to represent the water pump current.

Further, in the above embodiment, the current detecting and driving module further includes: a drive circuit for driving water pump opens and stops, drive circuit includes: a metal oxide semiconductor field effect transistor Q1, a diode D1, and a gate resistor R2, wherein:

the grid G electrode of the Q1 is communicated with one end of the R2, and the other end of the R2 is communicated with a first input/output I/O port of the main control chip;

the drain D of the Q1 is respectively communicated with the anode of the D1 and the water pump, the cathode of the D1 is connected with high level, and the source S of the Q1 is grounded.

Further, in the above embodiment, the current detecting and driving module further includes: a pull-down resistor R3 for preventing the Q1 from being started by mistake due to leakage current or interference, and an electrolytic capacitor EC1 for reducing the interference to the power supply when the water pump is started or shut down; wherein:

two ends of R3 are respectively connected to the G pole and the S pole of Q1, the positive pole of EC1 is respectively communicated with the high-level end of R1 and the negative pole of D1, and the negative pole of EC1 is communicated with the S pole of Q1.

Further, in the above embodiment, the current of the water pump detected by the current detection and driving module is a current after the water pump is started for a preset time.

Further, in the above embodiment, the pump idle pumping current is smaller than the pump pumping working current of the pump.

Further, in the above embodiment, the pumping working current is a current value of the water pump when the preset parameter meets the preset condition after reaching the preset time.

Further, in the above embodiment, when the food processor is a pasta machine, the food processor further comprises: the flowmeter is used for calculating the water outlet flow of the water pump and is respectively communicated with the water outlet of the water pump and the second detection pin of the main control chip;

the main control chip is also used for calibrating the current value of the water pump as the pumping working current of the water pump when the preset time is up and the flow of the flowmeter reaches the preset value.

Further, in the above embodiment, when the food processor is a steam fryer, the food processor further comprises: the evaporation tray is respectively communicated with the water outlet of the water pump and a third detection pin of the main control chip;

the main control chip is also used for marking the current value of the water pump as the pumping working current of the water pump when the difference value between the highest temperature of the evaporation tray in the preset time and the current temperature is larger than the preset value.

Further, in the above embodiment, the food processor further comprises an alarm device for water shortage alarm, and the alarm device is communicated with the second input/output I/O port of the main control chip.

Compared with the prior art, the food processor provided by at least one embodiment of the application has the following beneficial effects: the water shortage is judged by detecting different currents of the water pump when water and air are pumped, and water shortage alarming is carried out, so that a structure built in the water tank is omitted, water pollution is reduced, the water tank is safe to use, the structure is simple, and the cost is lower.

In addition, the embodiment judges whether the water tank is lack of water by detecting the current of the water pump communicated with the water tank, can quickly judge whether the water tank is lack of water, avoids the influence of the water tank on the strength or the forming of the food made by the food processor due to the water shortage of the water tank, and ensures the successful making of the food processor.

In some embodiments of the present application, the following effects can also be achieved: 1. only need increase a sampling resistor on water pump drive circuit, need not to float accessories such as check valve, practiced thrift the cost, mounting structure is simple, and reduces the water source pollution. 2. The drive circuit of the water pump is formed by the MOS tube, the diode and the grid resistor, and the MCU can control the on-off of the MOS tube through the high and low levels of the I/O port, so that the water pump is driven to start and stop. 3. Through setting up pull-down resistance R3, can eliminate static, prevent that leakage current or interference from making MOS misctart, increase circuit reliability. 4. By arranging the electrolytic capacitor EC1, the interference on the VCC power supply when the water pump is started or closed can be reduced, and the stability of the water pump power supply is increased.

In some embodiments of the present application, the following effects can also be achieved: 1. through setting up the time of predetermineeing, postpone and detect the water pump current, reinforcing lack of water judges the reliability. 2. The water pumping working current of pumping water to the water pump is used as the water shortage judgment basis, the current interval of pumping water to the water pump is automatically calibrated, the automatic calibration judgment interval is realized, the current interval of the water pump is also different when the water pump and each component are different, and therefore the reliability of water shortage judgment is enhanced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.

Fig. 1 is a schematic structural diagram of a food processor according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a current detection and driving module according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In practical application, an automatic water adding system is arranged in a food processing machine such as a wheaten food machine, so that liquid (such as water, egg liquid or vegetable juice) in a water tank is automatically extracted into a processing cavity, and the liquid is stirred with food materials (such as flour, rice flour, corn flour or starch) poured in advance in the processing cavity (such as a stirring cup of the wheaten food machine) to be made into food such as noodles or dumpling wrappers. The volume of the liquid added into the processing cavity of the food processor directly influences the strength or the shape of the prepared food, and is the key for the successful preparation of the food processor. Therefore, detecting a water shortage in the water tank to determine whether a sufficient amount of water is available in the water tank for feeding into the food processor is critical to the success of the food processor.

An embodiment of the utility model provides a food preparation machine is through the electric current that detects the water pump that communicates with the water tank to whether the water tank is lack of water is confirmed, does not have the structure of built-in the water tank, reduces water pollution, and simple structure, the cost is lower.

The embodiment of the utility model provides a food processor, including the processing chamber. In this embodiment, the food processor may be a pasta machine, in which case the processing chamber may be a blender cup, and the liquid in the water tank built in the pasta machine is pumped into the blender cup to provide water to the pasta to be made. The food processor may be a steam fryer, in which case the processing chamber may be an evaporator, and liquid in a water tank disposed within the steam fryer is drawn into the evaporator to provide a source of water to the evaporator, which is heated to produce steam.

The food processor provided by this embodiment may include, but is not limited to, a pasta machine and a steam fryer, and this embodiment is not limited and described herein. The utility model discloses following embodiment mainly uses food preparation machine to be the wheaten food machine and carries out automatic watering as the example and explains, and all the other food preparation machines automatic watering including steam fried pot etc. realize the principle the same with the automatic watered realization principle of wheaten food machine, and this embodiment is no longer repeated one by one.

Fig. 1 is a schematic structural diagram of a food processor provided in an embodiment of the present invention, as shown in fig. 1, the food processor provided in this embodiment may further include: the device comprises a water tank (not shown) for containing liquid, a water pump for pumping the liquid in the water tank into a processing cavity, a current detection and driving module for detecting the current of the water pump and driving the water pump to start and stop, and a main control chip for sending a water pump stop control signal and giving a water shortage alarm when the current of the water pump is the water pump idle current, wherein the water pump stop control signal is used for controlling the current detection and driving module to drive the water pump to stop rotating; wherein:

the water pump is provided with a water inlet and a water outlet, the water inlet is communicated with the water outlet of the water tank, and the water outlet is communicated with the processing cavity; the current detection and drive module is respectively communicated with the water pump and the main control chip.

In practical application, when the water pump works, the working current of the water pump has a large difference when the water pump pumps water and air. This embodiment judges through the electric current that detects the water pump that the water pump has or not taken out water to carry out the water shortage warning.

In this embodiment, the water shortage detection circuit of the food processor may be composed of three parts, namely a water pump, a current detection and driving module and a main control chip, the water pump is responsible for pumping water from the water tank, the current detection and driving module is responsible for driving the water pump and detecting the current of the water pump and feeding back the current to the main control chip, and the main control chip is responsible for controlling the start and stop of the water pump and processing the feedback information of the current signal of the water pump.

When the main control chip determines whether the water pump current is the pump idle current, the existing determination algorithm in the prior art can be adopted, for example, a preset value is set, and the detection value is compared with the determination value. When the main control chip judges whether the water pump current is the water pump idle pumping current, only the preset value set in the existing judging algorithm needs to be changed, and the algorithm does not need to be improved.

Optionally, the pump idle pumping current may be a preset fixed current value, for example, when the water pump is powered by 5V, the pump idle pumping current may be set to 80 to 100 mA. At the moment, when the main control chip judges whether the water pump current is the water pump idle pumping current, the detected water pump current is directly compared with a preset fixed current value, and whether the difference value of the detected water pump current and the preset fixed current value is within a preset range is judged; and when the difference value is within a preset range, judging that the current of the water pump is the idle pumping current of the water pump.

Optionally, the water pump idle pumping current may be smaller than the water pumping working current of the water pump, and at this time, when the main control chip determines whether the water pump current is the water pump idle pumping current, the detected water pump current is compared with the water pumping working current, and whether the water pump current is smaller than the water pumping working current is determined; and when the current of the water pump is smaller than the pumping working current, judging that the current of the water pump is the pumping current of the water pump. The water pumping working current of the water pump can be a preset fixed current value, for example, when the water pump is powered by 5V, the water pumping working current can be set to be 310-340 mA; the pumping working current may also be a calibration current in a preset mode, and a specific calibration implementation manner of the pumping working current is described in the following calibration embodiment, which is not limited herein.

Wherein the water pumping working current is the current when the water pump pumps water.

Optionally, as shown in fig. 1, the main control chip may be a single chip microcomputer (MCU for short).

Wherein, the liquid that the water tank was deposited in this embodiment can be liquid such as water, vegetable juice or egg liquid, and this embodiment mainly uses water as the example to explain, and the extraction principle of other liquid is the same with the extraction principle of water, and this embodiment is no longer repeated here.

The embodiment of the utility model provides a food preparation machine through detecting the water pump and taking out the electric current that water and sky were different when taking out, judges whether lack of water to and carry out the water shortage warning, no built-in structure in the water tank, reduce water pollution, and simple structure, the cost is lower.

Fig. 2 is a schematic circuit diagram of the current detection and driving module provided in the embodiment of the present invention, as shown in fig. 2, the current detection and driving module may include: a detection circuit for detecting a water pump current, the detection circuit may include a sampling resistor R1, wherein:

one end of the R1 is respectively communicated with the water pump and a first detection pin of the main control chip, and the other end of the R1 is connected with a high level; where the voltage drop across R1 is used to represent the water pump current.

Specifically, as shown in fig. 2, R1 is a sampling resistor, and the water pump current flows through the sampling resistor R1 and then through the water pump to ground. In the case of no-air pumping and no-air pumping, the current of the water pump is different, the voltage drop generated on the R1 is also different, and the embodiment identifies whether the water pump pumps water or not by detecting the voltage at two ends of the R1.

One end of the R1 is connected to VCC, the other end of the P _ PUMP _ ELECTRIC end is connected to the water PUMP, and is connected to a first detection (for example, ADC detection) pin of the MCU, and the MCU reads the voltage value at the two ends of the R1, so as to obtain the water PUMP current. In fig. 2, CN1 is a terminal for connecting a water pump, and the connection between the water pump and the terminal CN1 is the same as that in the prior art, and is not described herein again.

Optionally, the end of the resistor R1 connected to VCC is a 5V supply voltage, so that it is only necessary to sample the voltage of the resistor R1 at the other end P _ PUMP _ ELECTRIC, to identify whether water is pumped by the water PUMP.

The embodiment of the utility model provides a food processor utilizes the water pump, only needs to increase a sampling resistance on water pump drive circuit, need not to float and ends accessories such as valve, has practiced thrift the cost, and mounting structure is simple, and reduces the water source and pollute.

Further, as shown in fig. 2, the current detecting and driving module may further include: a drive circuit for driving water pump opens and stops, drive circuit can include: a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET or MOS Transistor for short) Q1, a diode D1, and a gate resistor R2, wherein:

a grid G electrode of the Q1 is communicated with one end of the R2, and the other end of the R2 is communicated with a first Input/Output (I/O) port of the main control chip; the D pole of the drain of the Q1 is respectively communicated with the positive pole of the D1 and the water pump, the negative pole of the D1 is connected with high level, and the S pole of the source of the Q1 is grounded.

Specifically, as shown in fig. 2, D1 is a freewheeling diode, which prevents the back emf generated when the water pump is turned off from breaking through MOS transistor Q1. R2 is a gate resistor for changing the steepness of the front and rear edges of the control pulse input to the gate G of the MOS transistor and preventing the oscillation caused by the parasitic capacitance and the inductance, and the implementation principle is the same as that of the prior art, and this embodiment is not described herein again.

In this embodiment, one end P _ PUMP end of the R2 is connected to the first I/O port of the MCU, and the MCU controls the on/off of the MOS transistor through the high/low level of the first I/O port, thereby driving the water PUMP to start or stop.

The embodiment of the utility model provides a food preparation machine constitutes the drive circuit of water pump through MOS pipe Q1, diode D1 and grid resistance R2, R2 and MCU's first IO mouth intercommunication, the break-make of the high low level control MOS pipe of MCU accessible IO mouth to opening of drive water pump stops.

Further, in the above embodiment, the current detecting and driving module may further include: two ends of a pull-down resistor R3 and R3 for preventing the false start of the Q1 due to leakage current or interference are respectively connected to the G pole and the S pole of the Q1.

The food processor provided by the embodiment of the utility model can eliminate static electricity, prevent MOS from being started by mistake due to leakage current or interference, increase the reliability of the circuit,

further, in the above embodiment, the current detecting and driving module may further include: an electrolytic capacitor EC1 for reducing the interference to the power supply when the water pump is started or shut down; wherein:

the positive electrode of EC1 is respectively communicated with one end of R1 connected with high level and the negative electrode of D1, and the negative electrode of EC1 is communicated with the S electrode of Q1.

The embodiment of the utility model provides a food processor through setting up electrolytic capacitor EC1, can reduce the water pump and start or to the interference of VCC power when closing, increases the stability of water pump power simultaneously.

Further, in the above embodiment, the water pump current detected by the current detection and driving module is a current after the water pump is started for a preset time.

Alternatively, the preset time may be 50 ms.

In practical application, because the water pump starting time is short, the water pump starting current is high when the water pump starting instantaneous current is stable, and the current difference between the air suction and the water suction measured when the water pump is started is small, so that misjudgment is easily caused.

In this embodiment, in order to solve when the water pump starts the measured empty pump with take out water the current difference is less, easily causes the problem of erroneous judgement, this embodiment detects the water pump and starts the electric current after the time of predetermineeing (for example start 50 MS), and voltage value after the water pump starts the stability through the sampling makes whether more reliable of lack of water is judged according to the water pump current.

When water and air are pumped in the actual measurement, the difference value of the measured current at the moment of starting the water pump is about 110mA, and the difference value of the measured voltage after the water pump is stabilized is about 230 mA.

For example, taking a food processor as a pasta machine as an example, the normal pasta making machine has a water amount of only about 200g according to the dough-water ratio, and the water pump operation time is short. Because the starting time is short, the current is large when the water pump is started, the current difference between the pumped water and the pumped air is small, and the voltage sampling value adopts the current after the water pump is started by 50MS, the sampling current value at the moment of starting the water pump can be removed, and the judgment reliability is improved.

For example, in the case of a food processor as a steam fryer, because the steam fryer needs to discharge steam quickly, a direct injection boiler is adopted, and because the direct injection boiler can only store a very small amount of water, the water pump adopts a mode of intermittently pumping water to prevent water from being sprayed. Because the starting time is short, the current is large when the water pump is started, the current difference between the pumped water and the pumped air is small, and the voltage sampling value adopts the current after the water pump is started by 50MS, the sampling current value at the moment of starting the water pump can be removed, and the judgment reliability is improved.

The embodiment of the utility model provides a food preparation machine, through setting up the preset time, postpone the detection water pump electric current, reliability is judged in the reinforcing lack of water.

Further, in the above embodiment, when the pumping working current is the calibration current in the preset mode, the pumping working current is the current value of the water pump when the preset parameter meets the preset condition after the pumping working current reaches the preset time.

In this embodiment, because the difference of water pump and each components and parts, when taking out water, there is the difference also in the electric current interval of water pump, needs to demarcate every food preparation machine, realizes taking out the automatic demarcation of the water pump electric current interval when water.

Specifically, in a preset mode, the main control chip can start the water pump and start timing; when the rotation time of the water pump reaches the preset time, judging whether the preset parameters meet the preset conditions or not; and when the preset parameters meet the preset conditions, calibrating the current of the water pump at the current time as the pumping working current.

Optionally, when the food processor is a pasta machine, the food processor may further comprise: and the flowmeter is used for calculating the water outlet flow of the water pump and is respectively communicated with the water outlet of the water pump and the second detection pin of the main control chip.

In this embodiment, whether the flow counted by the flow meter meets the preset condition or not is judged within the preset time, so as to realize the calibration of the pumping working current.

The main control chip is also used for calibrating the current value of the water pump as the pumping working current of the water pump when the preset time is up and the flow of the flow meter reaches the preset value.

In the embodiment, due to the difference between the water pumps and components, the current judgment intervals are different when the water pumps of different wheaten food machines pump water, and the automatic calibration of each wheaten food machine is realized by combining the automatic cleaning function of the production line. Specifically, after entering a calibration program, firstly, an automatic cleaning function is started to calibrate the current of the water pump, the automatic cleaning function defaults that the water outlet is 200g, and the working time is about 15 s. After the water pump is started to work, the flow meter starts to record the flow, the main control chip continuously detects the flow of the flow meter within a preset time (such as 15 s), and if the flow meter detects that the flow is 0 within 15s, the calibration fails; otherwise, the main control chip records the current value as a calibrated using current value, and the current detection value is stored in the EE PROM for water shortage judgment.

Optionally, when the food processor is a steam fryer, the food processor may further comprise: and the evaporation tray is respectively communicated with the water outlet of the water pump and the third detection pin of the main control chip.

In this embodiment, whether the temperature of the evaporation pan meets the preset condition or not is judged within the preset time, so as to realize the calibration of the pumping working current.

The main control chip is also used for calibrating the current value of the water pump as the pumping working current of the water pump when the difference value between the highest temperature of the evaporation tray in the preset time and the current temperature is larger than the preset value.

In this embodiment, because the difference of water pump and components and parts, the electric current judgement interval has the difference when the water pump of different steam fryer reaches water, judges through combining the dry combustion method of evaporating dish and realizes the automatic calibration of every steam fryer. Specifically, after entering the calibration procedure, the evaporation pan is firstly started, and when the temperature of the evaporation pan reaches the dry-burning temperature point (for example, 140 ℃), the evaporation pan is turned off to heat, the water pump is turned on, and the countdown of the preset time (for example, 30S) is performed at the same time. In the 30S time, the main control chip continuously refreshes and records the highest temperature of the evaporation tray, after the 30S time is over, the main control chip compares the current temperature with the recorded highest temperature, when the temperature is reduced to exceed a certain temperature value (such as 20 ℃), the water pump is considered to have water pumped into the evaporator at the moment, the current value of the water pump measured at the moment is recorded into an EEPROM in the MCU, the software is marked as the completion of calibration and can be used for the judgment of water shortage later; and if the current temperature is reduced to a value which does not reach the set value, determining that the calibration fails, and re-calibrating.

The embodiment of the utility model provides a food preparation machine, the basis is judged as the lack of water to the work current that draws water that pumps water, and draws water the interval automatic calibration of electric current of water to the water pump, realizes that automatic calibration judges the interval, when having avoided the difference of water pump and each components and parts, also has the difference between the electric current interval of water pump when leading to drawing water to the reliability that reinforcing lack of water was judged.

Further, in the above embodiment, the food processor may further include an alarm device for water shortage alarm, the alarm device being in communication with the second input/output (I/O) port of the main control chip.

Optionally, the alarm device may include a buzzer and/or an indicator light, and the buzzer buzzes the alarm and/or the indicator light flashes the alarm.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" word structure "and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and thus, is not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through 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.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A food processor safe in use, comprising a processing chamber, characterized in that the food processor further comprises: the water pump device comprises a water tank for containing liquid, a water pump for pumping the liquid in the water tank into the processing cavity, a current detection and drive module for detecting the current of the water pump and driving the water pump to start and stop, and a main control chip for sending a water pump stop control signal and giving a water shortage alarm when the current of the water pump is the water pump idle pumping current, wherein the water pump stop control signal is used for controlling the current detection and drive module to drive the water pump to stop rotating; wherein:

2. The food processor of claim 1, wherein the current sensing and driving module comprises: the detection circuit is used for detecting the current of the water pump and comprises a sampling resistor R1;

wherein the voltage drop across R1 is used to represent the water pump current.

3. The food processor of claim 2, wherein the current sensing and driving module further comprises: a drive circuit for driving water pump opens and stops, drive circuit includes: a metal oxide semiconductor field effect transistor Q1, a diode D1, and a gate resistor R2, wherein:

4. The food processor of claim 3, wherein the current sensing and driving module further comprises: a pull-down resistor R3 for preventing the Q1 from being started by mistake due to leakage current or interference, and an electrolytic capacitor EC1 for reducing the interference to the power supply when the water pump is started or shut down; wherein:

5. The food processor of claim 1, wherein the current of the water pump detected by the current detection and drive module is a current after a predetermined time of starting the water pump.

6. The food processor of claim 1, wherein the pump idle current is less than the pump operating current.

7. The food processor of claim 6, wherein the pumping operation current is a current value of the water pump at which a predetermined parameter satisfies a predetermined condition at a predetermined time.

8. The food processor of claim 7, wherein when the food processor is a pasta machine, the food processor further comprises: the flowmeter is used for calculating the water outlet flow of the water pump and is respectively communicated with the water outlet of the water pump and the second detection pin of the main control chip;

9. The food processor of claim 7, wherein when the food processor is a steam fryer, the food processor further comprises: the evaporation tray is respectively communicated with the water outlet of the water pump and a third detection pin of the main control chip;

10. A food processor as claimed in any one of claims 1 to 9, further comprising an alarm device for a water shortage alarm, the alarm device being in communication with the second input/output I/O port of the main control chip.