CN111543850A

CN111543850A - Pressure regulating valve and heating cooker

Info

Publication number: CN111543850A
Application number: CN202010532596.5A
Authority: CN
Inventors: 李述星
Original assignee: Fanfei Beijing Technology Co ltd
Current assignee: Fanfei Beijing Technology Co ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2020-08-18

Abstract

The invention provides a pressure regulating valve and a heating cooker, wherein the pressure regulating valve comprises a stepping motor; the driving gear is driven by the stepping motor to rotate; the transmission arm comprises an arc-shaped meshing section arranged at the first end of the transmission arm, the arc-shaped meshing section is meshed with the driving gear, a pivot shaft is arranged between the first end and the second end of the transmission arm, and the transmission arm can rotate around the pivot shaft; the upper end of the stepless pressure regulating valve is abutted to the second end of the transmission arm, the lower end of the stepless pressure regulating valve is provided with an elastic part which is pressed on a vent hole at the bottom of the stepless pressure regulating valve, and the stepless pressure regulating valve is provided with an air leakage hole. The pressure regulating valve and the heating cooker can more accurately and efficiently control the pressure value, so that hybrid rice with the optimal gelatinization temperature of 106 ℃ can be cooked better.

Description

Pressure regulating valve and heating cooker

Technical Field

The invention relates to the field of cooking appliances, in particular to a regulating valve and a heating cooker.

Background

With the abundance of material life and the increasing quality of life of people, higher requirements are put on the mouthfeel and the sense organ of food cooking of cooking appliances. The conventional electric rice cooker usually has poor taste when cooking the hybrid rice, so that the hybrid rice widely planted in China is difficult to be accepted by the market for a long time. Based on the above problems, the applicant found through a lot of studies that the cause of the bad taste of the hybrid rice is not the cause of the variety itself, and the real cause is that the cooking temperature of most electric rice cookers does not reach the temperature required by the cooking of the hybrid rice, because the maximum temperature that the common electric rice cooker can provide under the atmospheric pressure based on sea level can only be close to 100 ℃ of the boiling point, and the optimal gelatinization temperature of most hybrid rice is as high as about 106 ℃. Therefore, there is a need for a cooking device capable of precisely and efficiently adjusting the pressure to maintain the gelatinization temperature of rice for cooking hybrid rice at 106 ℃.

Fig. 1 is a schematic structural view of a pressure regulating valve of a conventional pressure-adjustable heating cooker. The adjustable pressure heating cooker comprises a first pressure regulating valve and a second pressure regulating valve used for finely regulating the pressure in a cooking space when the first pressure regulating valve is in a closed state, and the adjustable pressure heating cooker is complex in structure and needs two regulating valves for matching and regulating. Because first governing valve adopts the metal ball structure, the metal ball is influenced by steam and is rocked easily, the regulation efficiency is not high, stability is also relatively poor, there is certain security problem, and the valve body of second air-vent valve adopts screw drive structure, the motion of the drive arm of this screw structural connection only in minimum scope is effectual, the up-and-down motion of drive arm left end can be realized only in the motion of very little within range promptly, there is the less problem of output torque in this kind of structure on the one hand, on the other hand, if rotation degree is too big, then can increase mechanical tension, and loss moment, consequently the fine setting of pressure can only be carried out to the second air-vent valve, and the speed of pressure adjustment is not ideal.

Disclosure of Invention

Technical problem to be solved

In view of the above technical problems, the present invention provides a heating cooker to improve the accuracy and efficiency of pressure regulation control and to improve the safety of the cooker, thereby better cooking a large amount of hybrid rice planted in south China.

(II) technical scheme

According to an aspect of the present invention, there is provided a pressure regulating valve including:

a stepping motor;

the driving gear is driven by the stepping motor to rotate;

the transmission arm comprises an arc-shaped meshing section arranged at the first end of the transmission arm, the arc-shaped meshing section is meshed with the driving gear, a pivot shaft is arranged between the first end and the second end of the transmission arm, and the transmission arm can rotate around the pivot shaft;

the upper end of the stepless pressure regulating valve is abutted to the second end of the transmission arm, the lower end of the stepless pressure regulating valve is provided with an elastic part which is pressed on a vent hole at the bottom of the stepless pressure regulating valve, and the stepless pressure regulating valve is provided with an air leakage hole.

In some embodiments, the first end of the driving arm includes a first end first branch and a first end second branch, one end of the first end first branch and one end of the first end second branch are fixedly connected, and the other end of the first end first branch and the other end of the first end second branch are respectively fixedly connected with the arc-shaped engaging section.

In some embodiments, the stepless pressure regulating valve further comprises:

the valve wall is arranged outside the elastic part, is in a cylindrical shape with an opening at the upper end and is provided with a flange extending towards the center of the opening, and the air release hole is opened on the valve wall;

the valve cap is opened downwards and is arranged above the elastic piece, the upper end of the valve cap is pressed against or fixed at the second end of the transmission arm, the lower end of the valve cap is provided with a flange extending outwards and is clamped with the flange at the upper end of the valve wall, and the valve cap can slide along the valve wall in a sealing way in the longitudinal direction;

a slide valve, comprising:

the pressing part is arranged at the lower end of the sliding valve and can press and completely cover the vent hole;

the sliding part is arranged at the upper end of the sliding valve and is in a cylindrical shape with an upward opening; a first compression elastic member is provided between the sliding portion and the bonnet.

In some embodiments, a sealing material is disposed between the bonnet and the valve wall.

In some embodiments, the sealing material is silicone.

In some embodiments, the pressing portion of the lower end of the sliding valve has a flat-headed arrow shape, a trapezoidal shape, or a spherical shape.

In some embodiments, the pressure regulating valve further comprises:

and the second compression elastic element is arranged between the upper part of the vent hole and the sliding part of the sliding valve, and the supporting force of the second compression elastic element is enough to enable the stepless pressure regulating valve to be in an opening state under a natural state.

According to another aspect of the present invention, there is provided a heating cooker including:

the cooking space is used for accommodating cooked objects and is provided with a vent hole above;

the pressure regulating valve as described above, which is installed above the vent hole, and controls opening and closing of the vent hole.

In some embodiments, the heating cooker further comprises:

a cooker body; and

the lid, cover in the opening on cooking device body upper portion, form a culinary art space of holding by the culinary art thing between the two, include:

an inner cover plate covering the opening of the cooker body;

the outer cover shell is positioned above the inner cover plate, is separated from the inner cover plate by a certain distance, and forms an accommodating space between the inner cover plate and the inner cover plate; and

and the frame part forms a steam passage between the inner cover plate and the outer cover shell, and the steam passage is communicated with the cooking space through the air leakage hole and the air vent arranged on the inner cover plate and is communicated with the external space.

In some embodiments, the heating cooker further comprises:

a pressure sensor that monitors a pressure condition within the cooking space;

a temperature sensor that monitors a temperature condition within the cooking space;

and the pressure regulating valve controller controls the opening and closing of the pressure regulating valve according to the pressure condition, the temperature condition and the cooking process stored by the pressure regulating valve controller.

(III) advantageous effects

According to the technical scheme, the heating cooker has the following beneficial effects:

(1) in the pressure regulating valve, the combination of the stepping motor, the driving gear and the transmission arm enhances the driving force and the control precision of the stepping motor. And compare in the mode output torque scope of lead screw bigger, the governing speed is faster, and the regulation precision is better, can replace two kinds of air-vent valves of current adjustable pressure heating cooking ware completely, lets the better taste of hybrid rice cooking that is difficult to cook.

(2) Compared with the metal ball structure adopted by the existing pressure regulating valve, the structure of the pressure regulating valve provided by the invention avoids the problems of instability and low regulation efficiency caused by the shaking of the metal ball generated by steam flow, improves the safety and stability, and has higher regulation efficiency.

(3) In the pressure regulating valve, a second compression elastic element is arranged at the lower part of the stepless pressure regulating valve, so that the pressure regulating valve is in a state of opening a passage in a natural state, the minimum value of the pressure control of the pressure regulating valve can be started from 1.00atm, and the controllable range of the pressure regulating valve is increased. In addition, some situations are avoided; such as the condition that the temperature in the cooker is reduced to generate negative pressure, so that the cover can not be opened or is difficult to open.

Drawings

FIG. 1 is a schematic view of a pressure regulating valve of a conventional pressure-adjustable heating cooker;

fig. 2 is a sectional view of a heating cooker according to an embodiment of the present invention;

FIG. 3 is a schematic view showing a pressure regulating valve portion of the heating cooker shown in FIG. 2;

FIG. 4 is a schematic view showing the change of the temperature and pressure in the pot with time when hybrid rice is cooked by the heating cooker of this embodiment.

[ description of main reference symbols of the invention ]

100-a cooker body;

110-a housing; 120-inner pot;

200-a cover body;

210-a sealing ring; 220-inner cover plate;

230-an outer cover shell; 240-frame part

260-a vent hole;

300-a heating assembly;

310. 320-a lower heater; 330. 340-an upper heater;

500-pressure regulating valve;

510-a stepper motor; 520-drive gear

530-a transmission arm;

550-stepless pressure regulating valve;

551-valve wall; 552-bonnet;

553 — a first compression spring element; 554-a slide valve;

551 a-air release hole;

553 a-a second compression spring element.

600-sensor group;

610-bottom temperature sensor; 620-a pressure sensor;

630-top temperature sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. It should be noted that in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Implementations not depicted or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. Directional phrases used in the embodiments, such as "upper," "lower," "front," "rear," "left," "right," and the like, refer only to the orientation of the figure. Accordingly, the directional terminology used is intended to be in the nature of words of description rather than of limitation.

The heating cooker enhances the safety and controllability by improving the two pressure regulating valves.

In one exemplary embodiment of the present invention, a heating cooker is provided. Fig. 3 is a sectional view of a heating cooker according to an embodiment of the present invention. As shown in fig. 2, the heating cooker of the present embodiment includes: a cooker body 100; a lid body 200 covering an opening of the cooker body 100, and forming a cooking space for accommodating an object to be cooked therebetween; a heating unit 300 disposed at predetermined positions of the cooker body 100 and the cover 200, for heating the cooked object in the cooking space; a pressure regulating valve 500 for controlling the opening and closing of a vent hole communicating the inside of the cooking space and the lid body; the sensor group 600 monitors the temperature and pressure conditions in the cooking space.

The respective components of the heating cooker of the present embodiment will be described in detail below.

The heating cooker is commonly known as an electric cooker or an electric pressure cooker, and can be used for steaming rice, cooking porridge or stewing meat, fish and the like. Because of its delicious cooking and rich functions, the heating cooker has become a necessary kitchen appliance at home. In the present embodiment, the description will be given mainly taking steaming rice as an example.

Referring to fig. 2, the cooker body 100 includes: a housing 110; a cylindrical inner pot 120 with a bottom detachably accommodated in the casing 110. Similar structures of the cooker body 100 are well known to those skilled in the art and will not be described in further detail herein.

The lid 200 is rotatably engaged with the housing 110 of the cooker body 100 to cover the inner pot 120, thereby forming a cooking space therebetween. In order to ensure the sealing of the cooking space, an annular gasket 210 is further provided between the lid 200 and the inner pot 120.

Referring to fig. 2, the cover 200 includes: an inner cover plate 220, an outer cover 230, and a frame part 240 formed between the inner cover plate and the outer cover. Wherein the frame portion 240 forms a steam escape cavity and a steam path between the inner cover plate 220 and the outer cover 230. The steam overflow chamber is communicated with the cooking space through the air release hole 551a and the air vent 260 opened on the inner cover 220, and is communicated with the space outside the cooker body 100 through the steam passage.

In order to cook food in the cooking space in all directions, heaters are provided at a plurality of positions of the heating cooker. Referring to fig. 2, lower heaters (310, 320) for heating the inner pot by electromagnetic induction are disposed at positions close to the inner pot in the case, and a plurality of upper heaters (330, 340) are disposed at positions on one side of the inner cover plate 220 of the cover body facing the cooking space.

Meanwhile, in order to monitor the environment of the cooking space, a bottom temperature sensor 610 is provided in the housing at a position close to the inner pot, and a pressure sensor 620 and a top temperature sensor 630 are provided at a side of the inner lid plate 220 of the lid plate facing the cooking space. The regulator valve controller controls the regulator valve 500 based on information provided by these sensors.

The pressure regulating valve 500 is installed on the inner cover plate. The pressure regulating valve 500 is used for regulating the pressure in the cooking space, such as between 0Kpa and 30Kpa, and automatically releases the pressure when the pressure in the cooker is higher than a preset warning pressure (for example, the set value is 30Kpa, and when the pressure is higher than 30Kpa), so that the pressure in the cooker is within a preset safe pressure value range. When the pressure regulating valve 500 is opened, the vent hole 260 is opened, and steam in the cooking space can enter the steam overflow cavity through the vent hole 260 and enter a space outside the cooker body 100 through a steam passage; when the pressure regulating valve 500 is closed, the vent hole 260 is closed.

Fig. 3 is a schematic structural view of a pressure regulating valve portion of the heating cooker shown in fig. 2. As shown in fig. 3, the pressure regulating valve 500 includes: a stepping motor 510, a driving gear 520, a transmission arm 530 and a stepless pressure regulating valve 550.

Wherein, the driving gear 520 is driven by the stepping motor 510 to rotate; in this embodiment, the drive gear 520 is coaxially fixed with the stepper motor 510 and is configured to coaxially rotate with the stepper motor 510.

The driving arm 530 includes an arc-shaped engaging section provided at a first end of the driving arm 530, and the arc-shaped engaging section is engaged with the driving gear 520; the driving arm 530 has a pivot shaft between a first end and a second end, the pivot shaft is pivoted to the cover above the cooking device, and the driving arm 530 can rotate around the pivot shaft.

In this embodiment, the first end of the driving arm 530 includes a first end first branch and a first end second branch, and one end of the first end first branch and one end of the first end second branch are respectively and fixedly connected to the arc-shaped engaging section to form a stable structure similar to a triangle. The first branch of the first end and the second end of the transmission arm 530 are on the same straight line, the pivot shaft is disposed on the straight line, and the other branch of the second branch of the first end is also connected to the pivot shaft. It is understood that in other embodiments, the first end of the transmission arm may also include only one branch, and both ends of the branch are respectively connected to the pivot shaft and the arc-shaped engagement section.

The pressure regulating valve of the embodiment enhances the driving force and the control precision of the stepping motor through the combination of the stepping motor, the driving gear, the transmission arm and the pressure sensor. Compare in the mode output torque scope of lead screw bigger, the governing speed is faster, and the regulation precision is better, can replace two kinds of air-vent valves of current adjustable pressure heating cooking ware completely, lets the better taste of hybrid rice culinary art that is difficult to cook.

In the adjusting process, the displacement motion of the second end of the transmission arm 530 is a main factor influencing the pressure adjustment, and the displacement speed and the displacement amount of the second end of the transmission arm 530 are related to the length of the transmission arms at the two sides of the pivot shaft and the radius ratio of the meshing gear of the arc meshing section to the driving gear. In this embodiment, as shown in fig. 3, the pivot shaft is disposed in the middle of the transmission arm, the arc radius of the arc-shaped engagement section is greater than the radius of the driving gear, and the engagement gear of the arc-shaped engagement section has the same shape as the driving gear. It will be appreciated that in practice, the appropriate pivot axis position and radius ratio may be set according to the output torque and speed requirements, for example, when the pressure regulating valve is used in a 100Kpa pressure cooker, the radius of the arc meshing section may also be configured to be smaller than the radius of the driving gear, i.e. a combination of larger driving arms may be driven by a smaller gear, so that the driving arms have enough force to overcome the reaction force of 100 kap.

The upper end of the stepless pressure regulating valve 550 abuts against the second end of the transmission arm 530, the lower end of the stepless pressure regulating valve 550 is provided with an elastic member which is pressed on the vent 260 at the bottom of the stepless pressure regulating valve 550, and part of the stepless pressure regulating valve 550 extends out of the steam overflow cavity to abut against the second end of the transmission arm 530.

The lower end of the stepless pressure regulating valve 550 is also provided with a gas release hole 551a, the upper part of the steam overflow cavity is provided with an opening communicated to the outside, and the stepless pressure regulating valve is configured in such a way that when the through hole is opened, the vent hole is communicated with the gas release hole and the opening so as to discharge the internal gas out of the steam overflow cavity.

The stepping motor 510, the driving gear 520 and the transmission arm 530 are located outside the steam overflow cavity, the stepping motor 510 drives the driving gear 520 to rotate actively, the first end of the transmission arm 530 swings along with the driving of the transmission arm, and the second end of the transmission arm 530 presses down or resets the stepless pressure regulating valve 550 to close or open the vent 260 through the transmission function of the transmission arm.

The stepless pressure regulating valve 550 includes: a valve wall 551 having a cylindrical shape with an open upper end, a lower end fixed to the inner cover plate of the lid body, and a gas release hole 551a formed at the bottom; a valve cap 552, which is open downward, and has an upper end pressed against or fixed to the transmission arm 530, an outer edge of the lower end engaged with an outer edge of the upper end of the cylindrical valve wall, and the valve cap 552 can slide longitudinally along the inner edge (or the outer edge, depending on the engagement position) of the valve wall 551 within a predetermined range; the slide valve 554 has a lower end press-fitting portion press-fitted to the air vent hole, an upper end sliding portion in a cylindrical shape having an upward opening, and a first compression spring 553 provided between the bottom of the cylindrical sliding portion and the bonnet.

The lower pressing portion of the sliding valve 554 is in a truncated cone shape and is pressed on the vent hole, but the invention is not limited thereto, and the front end of the sliding valve 554 may also be in other shapes, such as trapezoid, sphere, etc.

As shown in fig. 3, the pressure regulating valve 500 is a normally open valve. The pressure regulating valve 500 can be driven by the stepping motor 510 to make the first end of the transmission arm 530 swing, and the second end of the transmission arm 530 presses down or resets the stepless pressure regulating valve 550 through the transmission action of the transmission arm, thereby closing or opening the vent 260, so that the pressure in the cooker can be freely regulated within the rated value range. And when the pressure in the cooker is greater than the safety warning value, the pressure regulating valve 500 can automatically release the pressure to achieve the effect of safety protection. The pressure regulating system has the beneficial effect that the pressure regulating precision of the pressure regulating system in the cooking process is improved.

In this embodiment, the pressure regulating valve further comprises a second compressive elastic element disposed between the upper side of the vent 260 and the sliding part of the sliding valve 554, and the supporting force is sufficient to open the stepless pressure regulating valve 550 in a natural state, so that the minimum value of the pressure regulating valve for pressure control can be from 1.00atm, and the controllable range of the pressure regulating valve is increased. In addition, some situations are avoided; such as the condition that the temperature in the cooker is reduced to generate negative pressure, so that the cover can not be opened or is difficult to open.

The working principle of the pressure regulating valve in the embodiment is as follows:

1. when the pressure is required to be controlled to be increased, a backward signal is given to the stepping motor 510, and the stepping motor pushes the transmission arm 530 to rotate anticlockwise around the pivot shaft, so that the first end of the transmission arm 530 rotates along with the meshing action of the gears, and the second end of the transmission arm presses the valve cap 552 downwards, so that the stepless pressure regulating valve 550 is pressed downwards;

2. when the pressure needs to be reduced, a forward signal is given to the stepping motor 510, which pushes the transmission arm to rotate clockwise around the pivot shaft, so that the first end of the transmission arm 530 rotates clockwise, the second end of the transmission arm faces upward, the valve cap 552 is driven to face upward by the action of the elastic element, the stepless pressure regulating valve 550 is further released upward, and the vent hole is communicated with the steam overflow cavity;

in this embodiment, the pressure in the cooking space is monitored by the pressure sensor, and the pressure regulating valve controller controls the pressure regulating valve 500 to open and close by the stepping motor 510 according to the pressure in the cooking space monitored by the pressure sensor, the temperature in the cooking space detected by the plurality of temperature sensors (610, 620, 630), and the cooking process stored in the pressure regulating valve controller. The structure and related principles of the pressure sensor and the pressure regulating valve controller are well known in the art and will not be described in detail herein.

FIG. 4 is a schematic view showing the change with time of the temperature and pressure in the pot when the hybrid rice is cooked by the heating cooker of this embodiment. Referring to fig. 4, the cooking device of the present embodiment needs to go through the following stages when cooking rice:

1. preheating water absorption stage

In the process, the pressure regulating valve is in a natural state (namely, the pressure regulating valve is in an open state) and does not participate in working, and the rice-water mixture in the inner pot is heated to 50 ℃ in stages by a plurality of heaters around the inner pot and is kept for 18 minutes, so that the rice is fully absorbed in a state without gelatinization reaction (generally, the water temperature is more than 50 ℃, and the gelatinization reaction starts to occur on the starch).

2. Concentrated heating stage

At this stage, the inner pot was heated with a strong fire and when the top temperature sensor monitored 74 ℃, it was experimentally verified that the water in the pot started to boil. Meanwhile, the pressure regulating valve is closed to enter a pressure-controlled cooking state.

3. Cooking stage with precise pressure control

In this stage, the pressure in the cooker is controlled to make the cooking temperature reach the optimal gelatinization temperature required by the rice, which is a key step for determining whether the rice is delicious or not. Through a large number of experiments, the optimal cooking pressure of hybrid rice in south China is found to be 27.5Kpa, so that the working mode of the pressure regulating valve is as follows: the pressure regulating valve is used for regulation, firstly, the stepping motor drives the related component to enable the valve cap to be at b1, after the pressure is rapidly increased to a preset value, if the pressure is greater than the preset value (such as 28Kpa), the stepping motor drives the related component to enable the valve cap to move towards a1, the pressure is slowly reduced, and if the pressure is reduced to be less than the preset value (such as 27Kpa), the stepping motor drives the related component to enable the valve cap to move towards b1, and the pressure is increased back to the preset value. The reciprocating action can control the pressure to be close to the preset value accurately. When the hybrid rice is cooked, the pressure in the cooker is kept at about 106 ℃ by adjusting the pressure regulating valve at this stage, so that the rice is fully gelatinized, after the rice is fully gelatinized, the pressurization is stopped, and the pressure regulating valve is opened to release the pressure to enter the next stage.

4. Stage of drying water

At this stage, the inner pot is continuously heated, the excess water is changed into steam and discharged through the pressure regulating valve, and the heating is stopped when the temperature of the bottom of the pot rises to 120 ℃, and most of the water in the bottom of the pot is evaporated.

5. Stewing and steaming stage

At this stage, the heater is heated in stages to maintain the temperature of the pot bottom at about 97 ℃, the pressure regulating valve is in an open state during this period, and the excess moisture is continuously evaporated until the cooking program is finished and the temperature preservation stage is entered.

6. Stage of heat preservation

At this stage, the heater is heated in stages to keep the temperature of the bottom of the pot at about 74 ℃, at which time the whole cooking process is finished, and the cover body can be opened to eat the rice.

So far, the introduction of the heating cooker of the embodiment of the invention is finished.

In conclusion, the heating cooker of the invention drives the combination of the pressure regulating valve and the pressure sensor by the stepping motor, and the pressure value in the pot can be accurately controlled, so that rice can be stably and fully gelatinized, and hybrid rice which is difficult to cook can be effectively released to have better taste.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure regulating valve, comprising:

a stepper motor (510);

a drive gear (520) driven to rotate by the stepping motor (510);

the transmission arm (530) comprises an arc-shaped meshing section arranged at the first end of the transmission arm (530), the arc-shaped meshing section is meshed with the driving gear (520), a pivoting shaft is arranged between the first end and the second end of the transmission arm (530), and the transmission arm (530) can rotate around the pivoting shaft;

the upper end of the stepless pressure regulating valve (550) is abutted to the second end of the transmission arm (530), the lower end of the stepless pressure regulating valve (550) is provided with an elastic part which is pressed on a vent hole (260) at the bottom of the stepless pressure regulating valve (550), and the stepless pressure regulating valve (550) is further provided with an air leakage hole (551 a).

2. The pressure regulating valve according to claim 1,

the first end of the transmission arm (530) comprises a first end first branch and a first end second branch, one ends of the first end first branch and the first end second branch are fixedly connected, and the other ends of the first end first branch and the first end second branch are respectively and fixedly connected with the arc-shaped meshing section.

3. The pressure regulating valve according to claim 1, wherein said stepless pressure regulating valve (550) further comprises:

the valve wall (551) is arranged outside the elastic part, is in a cylindrical shape with an open upper end and is provided with a horizontally extending flange, and the air release hole (551a) is opened on the valve wall (551);

the valve cap (552) is downwards opened and is arranged above the elastic piece, the upper end of the valve cap (552) is pressed or fixed on the second end of the transmission arm (530), the lower end of the valve cap (552) is provided with a horizontally extending flange which is mutually clamped with the flange at the upper end of the valve wall (551), and the valve cap (552) can slide along the valve wall (551) in a sealing way in the longitudinal direction;

a slide valve (554) comprising:

a press-fit portion provided at a lower end of the slide valve (554) and capable of pressing and completely covering the vent hole (260);

a sliding part which is arranged at the upper end of the sliding valve (554) and is in a cylindrical shape with an upward opening; a first compression elastic member (553) is provided between the sliding portion and the bonnet (552).

4. The pressure regulating valve according to claim 3, wherein a sealing material is disposed between said bonnet (552) and said valve wall (551).

5. The pressure regulating valve according to claim 4, wherein said sealing material is silicone.

6. A pressure regulating valve according to claim 3, characterized in that the nip at the lower end of the sliding valve (554) is in the shape of a flat headed arrow, a trapezoid or a sphere.

7. A pressure regulating valve according to claim 3, characterized in that said pressure regulating valve (500) further comprises:

and a second compression elastic element (553a) which is arranged between the upper part of the venthole (260) and the sliding part of the sliding valve (554), and has a supporting force enough to enable the stepless pressure regulating valve (550) to be in an opening state under a natural state.

8. A heating cooker, characterized by comprising:

a cooking space for accommodating an object to be cooked, the cooking space having a vent hole (260) above;

the pressure regulating valve (500) according to any one of claims 1 to 7, said pressure regulating valve (500) being mounted above said vent hole (260) for controlling the opening and closing of said vent hole (260).

9. The heating cooker as claimed in claim 8, further comprising:

a cooker body (100); and

a lid body (200) covering an opening portion of an upper portion of the cooker body (100) to form a cooking space for accommodating an object to be cooked therebetween, comprising:

an inner cover (220) that covers an opening of the cooker body (100);

an outer cover shell (230) which is positioned above the inner cover plate and is separated from the inner cover plate by a certain distance, and an accommodating space is formed between the outer cover shell and the inner cover plate; and

and a frame part (240) forming a steam passage between the inner cover (220) and the outer cover (230), the steam passage communicating with the cooking space through a release hole (551a) and a vent hole (260) opened in the inner cover and communicating with the external space.

10. The heating cooker as claimed in claim 8, further comprising:

a pressure sensor that monitors a pressure condition within the cooking space;