How an electric pressure cooker detects pressure

Just use a timer to detect it.

The user turns the mechanical clockwork timer PT to the appropriate holding gear, the PT contact is closed, and the mains voltage not only makes the pressure holding heater EH2 start heating after obtaining power supply, but also makes the holding voltage indicator HL2 shine through the R2 current limit.

With the continuous heating of EH1 and EH2, the temperature in the pot gradually increases, and the pressure gradually increases, when the working pressure reaches 100kPa, the ST action resets the button and the contact is disconnected, which not only extinguishes HL1, but also makes EH1 stop heating. Since the PT is timing and the PT contacts are closed, HL2 is still on, EH2 continues to heat, and the pressure cooker enters the pressure holding state.

1. Check the valve gear. When using an electric pressure cooker to press food, after the lid is tightened, the exhaust valve gear should be set on the sealing gear, if the gear is set on the exhaust gear, then there will be a phenomenon that the pot has been exhausting after opening.

2. Check whether the pressure cooker is tightly covered. If the pressure cooker is not covered tightly, there will also be the phenomenon of air leakage in the electric pressure cooker, which is not only a first-time user, even if it is a frequent user, but also because of a period of sloppiness, resulting in the pressure cooker not covered tightly.

3. Check whether there are foreign objects in the sealing ring of the pressure cooker. If there is a foreign object on the sealing ring of the pressure cooker, the pressure cooker is not well sealed, and there will also be air leakage. Clean the seals of foreign matter.

4. Check whether the sealing ring of the pressure cooker is deformed. If the electric pressure cooker is used for a long time, the sealing ring is worn, and the sealing caused by deformation is not good, which will also cause air leakage.

5. Check whether the pot bile and lid are deformed. If the pot bladder and lid are deformed after bumping, resulting in poor sealing after the lid, it will also lead to air leakage.

6. The float valve of the voltage boiler is leaking. The float valve of the voltage pot is leaking, and the sealing ring needs to be replaced, if you can't see it, or can't replace it, it is recommended to go to the after-sales service for repair.

7. Leakage of pressure limiting exhaust valve. The leakage of the pressure limiting exhaust valve is due to the failure of the exhaust pipe, thimble, switch, etc., resulting in air leakage, which needs to be tested and repaired by professional maintenance personnel.

Don't tell me I have a pressure sensor, huh! That's it, this thing is generally called a pressure switch in the industry, it is actually a travel switch (a very simple thing, the same as a micro switch, the contact will be broken when broken) Installed at the bottom of the pot When the pressure cooker is under pressure, the heating plate will sink (move down) to produce displacement Drive the pressure switch to open the contact (the switch is normally closed), and cut off the power supply of the hot plate to control the pressure The size of the pressure is to adjust the action displacement of the pressure switch

The pressure limiting valve of the electric pressure cooker is used to do pressure limiting protection and exhaust is not exhausting during the working process.

The heating plate can be moved up and down. When the pressure is high, the heating plate is pressed down and resists the pressure switch (pressure controller) The pressure switch is disconnected. Enter the holding state.

When the cooling pressure in the pot becomes smaller, the pressure switch is reset when the inner tank rises. Power on and continue heating. No loops ...

Until the timer is up to the time to completely enter the state of heat warming.

Forgive me for not having any water in my stomach... I'm a repairer.

Electrical schematic.

5) Wiring diagram.

2.How it works.

1) Work process.

2) Pressure control.

PK=30-40kPa (starting pressure).

Power off for 3-5 minutes to judge the control parameters.

Boost to the set point.

The pressure holding range of different levels of food with different capacities in the same gear is different, the high-end is in the range of 50-80kpa, and the low-end is in the range of 20-50kpa.

Heat preservation. 3) Security protection.

Pressure protection. a.Closure lid protection.

Through the float valve and the lid locking device, the lid is not in place, the pot does not exceed 5kpa, and the lid cannot be opened if it is not deflated.

b.The working pressure is controlled by controllers and sensors.

c.Voltage limiting protection.

When the controller fails, the heating plate is continuously energized, and when the pressure rises to 100kpa, the pressure limiting gas release valve is exhausted, and the pressure in the pot is limited to 100kpa (the pressure limiting air release valve is not exhausting when working normally).

d.Pressure relief protection.

When the pressure limiting gas release valve is blocked, the pressure continues to rise, and the displacement and deformation of the bottom of the outer pot increases, and the plastic deformation is reached, the sealing ring of the lid and the inner pot produce a relative gap, and the exhaust is relieved.

Temperature protection. a.Temperature limit protection.

When the inner pot is dry boiled, empty boiled, no sealing ring is placed, and the air leaks, the pressure in the pot cannot be raised, and when it reaches a certain temperature, the power supply will be automatically cut off.

b.Over-temperature protection.

When the temperature limit fails, the pot continues to heat up, and when the protective temperature of the thermal fuse is reached, the thermal fuse is disconnected and the power supply is automatically cut off.

The electric pressure cooker circuit board only detects the temperature and controls the time. The pressure is controlled by the pressure limiting valve on the lid.

<> "1. Can an electric pressure cooker be used without a float valve?

Electric pressure cookers cannot be used without float valves, which not only has great safety risks, but also will cause certain effects when cooking food. Because there is no float valve, if you continue to use it, it is equivalent to exhausting and depressurizing at any time, and the temperature of the water vapor sprayed out is particularly high, and it will be splashed out with hot water, if it splashes to the human body, it will cause harm to the human body, and at the same time, the rapid loss of internal moisture will cause problems such as undercooked, dry, and scorched food.

2. What should be paid attention to when using an electric pressure cooker?

1. Pay attention to cleanliness.

After the use of the electric pressure cooker, it must be cleaned vigorously to avoid food residues that are not cleaned, which will dry out after a long time, and it will be more difficult to clean in the future. At the same time, compared with ordinary pressure cookers, you need to pay more attention when cleaning, because the electric pressure cooker needs to be connected to the power supply, and the electric socket is designed below.

2. Pay attention to the number of ingredients you put in.

When cooking food, you should pay attention to the number of ingredients put in, not too much and not too little, if there is too much, the food is easy to enter the float valve and cause blockage, and it may also block the gas outlet of the electric pressure cooker, which is very dangerous if you can't get out. If there are too few ingredients, there is a risk that the bottom will burn the pot.

3. Pay attention to the operation.

When using an electric pressure cooker, pay attention to the operation sequence, and make sure that the air release valve returns to its original position after the molded operation sequence of putting in food and water, covering the pot, and adjusting the pressure before pressing the start button to cook.

The pressure of the pressure cooker is determined according to the weight of the pressure cap and the strength of the spring, when the manufacturer designs, the thickness of the wall of the pressure cooker can withstand the pressure of 2 kg, and the weight of the pressure cap and the strength of the spring are mostly designed between, so the pressure of the pressure cooker is generally kg.

It is also possible to measure the standard air pressure by the temperature of the outer wall of the pressure cooker.

100° Inner and Outer Wall Pressure Difference (MPa).

Self-measurement of temperature to know the internal pressure.

A pressure cooker, also known as a pressure cooker, is a kind of kitchen cooker. The pressure cooker elevates this physical phenomenon by the boiling point of the liquid at higher air pressure, exerting pressure on the water so that the water can reach a higher temperature without boiling, thus speeding up the efficiency of cooking food. It can be used to heat cooked food to more than 100 degrees, and at high altitudes, the pressure cooker can avoid the problem of low boiling point of water and difficult to cook food.

Its advantages are time-saving and energy-saving, and the disadvantage is that when it is operated incorrectly or there are defects, it may cause injury.

Summary. Dear, hello, very happy for your question, the pressure gauge of the medical pressure cooker is tested in **, to help you find the following answers: the inspection of the pressure gauge is inspected in the metrology and testing institute of the Bureau of Quality and Technical Supervision.

The pressure gauge verification needs to be in the local market supervision department, which is the original quality and technical supervision bureau.

Dear, hello, very sensitive digging chain Xing your question, the pressure gauge of the medical pressure cooker is tested in the first test, to help you find the following answers: the inspection of the pressure gauge is inspected in the measurement and testing institute of the Bureau of Quality and Technical Supervision. The pressure gauge verification needs to be in the local market supervision department, which is the original quality and technical supervision bureau.

Pro, pressure gauge (English name: pressure gauge) refers to the elastic element as a sensitive element, measuring and indicating higher than the ambient pressure of the instrument, the application is extremely common, it is almost all industrial processes and scientific research fields. It can be seen everywhere in the hot early spring stove pipe network, oil forest good gas transmission, water supply and gas supply system, vehicle repair and maintenance plant and shop.

Turn the pot body upside down, open the screws on the bottom cover, after opening the bottom cover, you can see the internal structure of the pot, first look at the bottom, check whether the circuit board has burned out and burned black, if there are traces of burning and blackening, it is a problem with the circuit board, and the circuit board can be replaced directly.

If there is no abnormality in the circuit board and there are no signs of burnout, it is a burned fuse, how to detect the fuse? The fuse is a wire with a rubber sleeve fixed on the bracket, then use a Phillips screwdriver to remove the screw, then pull the fuse out, and then screw the two ends of the fuse together and plug it in. If there are two fuses, if one of them is burned, you can directly cut off the burned fuse and dock it, and then fix the fuse again on the bracket and install it.

The pressure cooker range is around 35kpa-80kpa, and the maximum pressure will reach 85-90kpa.

The working pressure range of domestic electric pressure cooker is 40kpa-80kpa (a standard atmospheric pressure is about 100kpa). The parameters on the back of the fuselage should be indicated, and the temperature in the pot is 110-120 degrees Celsius at the rated pressure.

An electric pressure cooker (also known as a pressure cooker, pressure cooker, etc.) is a type of kitchen cooker. This physical phenomenon is increased by the boiling point of the pressure cooker at a higher air pressure by tapping the base liquid, exerting pressure on the water so that the water can reach a higher temperature without boiling, thus speeding up the efficiency of stewing food. In high-altitude sheltered areas, the use of pressure cookers can avoid the problem of low boiling point of water and difficulty in cooking food.

The electric pressure cooker is an upgraded product of the traditional pressure cooker and the rice cooker, which combines the advantages of the pressure cooker and the rice cooker, adopts new technologies and new structures such as elastic pressure control, dynamic sealing, external screw cover, and adjustable electric switch for attack and displacement, fully sealed cooking, and continuously adjustable pressure, which completely solves the safety problem of the pressure cooker and relieves the potential safety hazards that have plagued consumers for many years in ordinary pressure cookers.

The electric pressure cooker achieves pressure control by controlling the temperature, not by a pressure sensor. At least I've never seen a pot with a pressure sensor.

Here's how it works::

When the temperature in the pot rises to the set temperature, the temperature switch at the bottom of the pot (generally there is a mechanical bimetal switch, and the advanced one has an electronic temperature sensor and corresponding control circuit) disconnects the circuit, and the electric heating plate stops heating.

When the temperature in the pot drops to the set lower limit temperature, the temperature switch is closed again, the circuit is turned on, and the electric heating plate starts heating again.

Repeat the above process to achieve the pressure cooker when the temperature in the pot is kept within the set range.

When the electric pressure cooker is heated, the pot body is sealed, and the pressure in the pot also rises with the rise of temperature, because the boiling point of the water will rise due to the rise of pressure, so continuing to heat will further increase the temperature, and the temperature increase will cause the pressure to increase, and the purpose of heating and increasing pressure will be realized in turn. Therefore, the electric pressure cooker only needs to control the temperature to control the pressure in the pot.

The pressure relief valve is only a device that is convenient to quickly reduce the pressure and temperature in the pot, and at the same time plays a role in safety protection, and is not used to control the pressure.

Pressure switch control. When the pressure is up, the electric heating is disconnected, and the pressure is reduced and the power is turned on again. Unlike a normal pressure cooker, the valve above only serves a safety role.