CN212912783U

CN212912783U - Pressure cooking device

Info

Publication number: CN212912783U
Application number: CN202020429290.2U
Authority: CN
Inventors: 朱泽春; 王涛; 李鹏辉
Original assignee: Joyoung Co Ltd
Current assignee: Shandong Jiuchuang Home Appliance Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2021-04-09
Anticipated expiration: 2030-03-30

Abstract

The utility model belongs to the domestic appliance field, concretely relates to pressure cooking device. Comprises a pot cover and a pot body; the pot body is provided with a plurality of outward turning pot teeth and connecting arcs connected with the pot teeth at intervals; the pot cover is provided with a float valve, an opening stopping ejector rod and cover teeth for locking the pot teeth; the upper end of the opening stopping ejector rod is used for clamping the float valve, and an ejector rod head at the lower end of the opening stopping ejector rod is arranged on the lower side part of the pot cover in a telescopic penetrating manner; the pot teeth comprise positioning pot teeth, and connecting arcs on two sides of the positioning pot teeth form a cover closing connecting arc and a cover opening connecting arc respectively; and a gap is reserved between the closing cover connecting arc and the ejector rod head when the closing cover connecting arc is completely extended out. The ejector rod head can be ensured to be completely extended out in the cover closing process and after the cover closing is finished, the float valve cannot be blocked, the complete reset of the float valve is ensured, and the use safety is ensured.

Description

Pressure cooking device

Technical Field

The utility model belongs to the domestic appliance field, concretely relates to pressure cooking device.

Background

The inner pot is in pressure state when the electric pressure cooker works, in order to prevent safety accidents caused by opening and closing the cover, the pot cover of the existing pressure cooker is provided with a safety opening and closing device so as to ensure that the cover can not be opened under the pressure state and the cover can be smoothly opened and closed under the non-pressure state. The most common structure of the safe opening and closing device of the current pressure cooker is as follows: as shown in fig. 1, the float valve comprises a valve rod, an opening stop mandril is connected on the float valve, the upper end of the opening stop mandril comprises a valve rod hole and a stop groove for the up-and-down movement of the float valve, and the lower end connected by a linkage rod frame is provided with a mandril head; the edge of the pot cover is provided with a through hole, the ejector rod head passes through the through hole and extends out of the pot cover, and a spring telescopic structure is sleeved on the ejector rod head; the cover opening and closing operation is realized through the mutual matching of the ejector rod head and the pot teeth of the pot body. The method specifically comprises the following steps:

when the cover is opened, when no pressure exists in the cooker, the float valve falls down under the action of gravity, the diameter of the middle part of the valve rod is smaller than the width of a stop groove on the stop ejector rod, the cooker cover is rotated, the action of the ejector rod head is that the ejector rod head passes through a cooker tooth from a natural extending state at the beginning, the ejector rod head is gradually compressed into the upper cover along with the cooker tooth by a spring, the ejector rod head retracts to drive the linkage rod frame to retreat, the valve rod slides into the stop groove from a valve rod hole, and then the cooker cover can be opened smoothly; when pressure is applied in the cooker, the valve rod rises, the lower part of the valve rod corresponds to the valve rod hole, the diameter of the lower part of the valve rod is larger than the width of the stop groove on the stop ejector rod, so the valve rod cannot slide into the stop groove, the cooker cover cannot be rotated, the ejector rod head cannot retreat due to the incapability of retreating of the linkage rod frame and always props up and extends out of the inner side of the cooker cover and clamps the outer cooker, the cooker cover cannot rotate, and the cooker cover cannot be opened,

when the cover is closed, no pressure exists in the cooker, the top rod head is firstly positioned on one side of the cooker teeth, the cooker cover rotates to close the cover, the top rod head acts in a way that a spring at the top rod head is gradually compressed into the upper cover by the cooker teeth from a natural extending state, the top rod head drives the linkage rod frame to move in the process, so that the stop groove clamps the floater to prevent the floater from moving upwards, the top rod head resets and extends after sliding over the turning teeth, the top rod head drives the stop top rod to move forwards, the valve rod is positioned on the valve rod hole, the cover closing operation is finished, and the float valve can move up and down at the position of the valve rod hole through the change of the back pressure. Thereby ensuring that the cover cannot be opened under the state of pressure at the back.

However, when the existing safety opening and closing device is used, after the cover is closed, the ejector rod head does not reset and extend out, the valve rod is still clamped on the check groove, the safety opening and closing device cannot play a role at this time, and even if the pressure state exists, the pot cover can be opened, so that serious potential safety hazards are caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a pressure cooking device, which comprises a pot cover and a pot body; the pot body is provided with a plurality of outward turning pot teeth and connecting arcs for connecting the pot teeth at intervals; the pot cover is provided with a float valve, an opening stopping ejector rod and a cover tooth for locking the pot tooth; the upper end of the opening stopping ejector rod is used for clamping a float valve, and an ejector rod head at the lower end of the opening stopping ejector rod is telescopically arranged on the lower side part of the pot cover in a penetrating manner; the plurality of pot teeth comprise positioning pot teeth, connecting arcs on two sides of the positioning pot teeth respectively form a cover closing connecting arc and a cover opening connecting arc, and a gap is formed between the cover closing connecting arc and a top rod head of the opening stopping top rod when the cover closing connecting arc is completely extended out; the gap is arranged between the ejector rod head and the closing cover connecting arc when the ejector rod head is completely extended, namely, the ejector rod head is not contacted with the closing cover connecting arc when the ejector rod head is completely extended, so that the ejector rod head can be ensured to be completely extended and not blocked by the closing cover connecting arc; on the other hand, when the top rod head rotates along with the pot cover to close the cover, namely the top rod head rotates to pass through the process of the cover closing connecting arc, the top rod head cannot be blocked by the cover closing connecting arc, and the top rod head is ensured to extend freely; the ejector rod head can be completely extended out in the cover closing process and after the cover closing is completed, the upper end of the stop ejector rod for clamping the float valve can be completely reset, the float valve cannot be clamped and blocked, the complete reset of the float valve is guaranteed after the pressure cooking device is closed, and the use safety is guaranteed.

The utility model adopts the technical proposal that:

a pressure cooking device comprises a pot cover and a pot body; the pot body is provided with a plurality of outward turning pot teeth and connecting arcs connected with the pot teeth at intervals; the pot cover is provided with a float valve, an opening stopping ejector rod and cover teeth for locking the pot teeth; the upper end of the opening stopping ejector rod is used for clamping the float valve, and an ejector rod head at the lower end of the opening stopping ejector rod is arranged on the lower side part of the pot cover in a telescopic penetrating manner; the pot teeth comprise positioning pot teeth, and connecting arcs on two sides of the positioning pot teeth form a cover closing connecting arc and a cover opening connecting arc respectively; and a gap is reserved between the closing cover connecting arc and the ejector rod head when the closing cover connecting arc is completely extended out.

Preferably, the connecting arcs have a common center, the radius from the center of the connecting arcs of the closing cover to the center of the connecting arcs is R1, and the radius from the center of the connecting arcs to the center of the connecting arcs is R2; r1 < R2.

Preferably, the radius from the uncapping connecting arc to the center of the circle is R3, and R3 is not less than R2.

Preferably, the pot teeth are connected with the connecting arc through smooth inclined planes or arc-shaped planes.

Preferably, the pot body comprises a pot liner and a heat-preservation cover for accommodating the pot liner, and the pot teeth and the connecting arc are arranged on the heat-preservation cover; and the upper part of the outer wall of the heat-insulating cover is also sleeved with a heat-insulating ring.

Preferably, the heat insulation ring comprises a plurality of ring teeth matched with the pot teeth; the ring teeth are connected at intervals through fixed arcs to form the heat insulation ring; the plurality of the ring teeth comprise positioning ring teeth matched with the positioning pot teeth; the fixed arcs on the two sides of the positioning ring teeth form a cover closing fixed arc and a cover opening fixed arc respectively; and a gap is reserved between the cover closing fixing arc and the ejector rod head when the cover closing fixing arc is completely extended out.

Preferably, the fixed arcs have a common center, the radius from the center of the closed cover fixed arc to the center of the closed cover fixed arc is r1, the radius from the center of the other fixed arcs to the center of the closed cover fixed arc is r2, and r1 < r 2.

Preferably, the radius from the cover opening fixing arc to the center of the circle is r3, and r3 is not less than r 2.

Preferably, the heat insulation ring is made of glass fiber reinforced nylon material.

Preferably, the lid is detachably attached to the body.

The utility model has the advantages as follows:

the pot body is provided with a plurality of outward turning pot teeth and connecting arcs for connecting the pot teeth at intervals; the pot cover is provided with a float valve, an opening stopping ejector rod and a cover tooth for locking the pot tooth; the upper end of the opening stopping ejector rod is used for clamping the float valve, and the ejector rod head at the lower end is telescopically arranged on the lower side part of the pot cover in a penetrating way; the plurality of pot teeth comprise positioning pot teeth, connecting arcs on two sides of the positioning pot teeth respectively form a cover closing connecting arc and a cover opening connecting arc, and a gap is formed between the cover closing connecting arc and a top rod head of the opening stopping top rod when the cover closing connecting arc is completely extended out; through when the ejector pin head stretches out completely, the ejector pin head with close and be equipped with the clearance between the lid and be connected the arc, promptly: on one hand, the ejector rod head is not contacted with the closing cover connecting arc when being completely extended out, so that the ejector rod head can be ensured to be completely extended out and not blocked by the closing cover connecting arc; on the other hand, when the top rod head rotates along with the pot cover to close the cover, the top rod head cannot be blocked by the cover closing connecting arc when rotating to pass through the cover closing connecting arc, and the top rod head is ensured to extend freely; the ejector rod head can be completely extended out in the cover closing process and after the cover is closed, the upper end of the stop ejector rod for clamping the float valve can be completely reset, the float valve cannot be clamped, the complete reset of the float valve is guaranteed after the pressure cooking device is closed, and the use safety is guaranteed.

The connecting arcs have a common circle center, the radius from the closed connecting arc to the circle center is R1, and the radius from the other connecting arcs to the circle center is R2; r1 < R2. For the circular pot body, the radius of the connecting arc of the closing cover is smaller than the radius of other connecting arcs, so that the ejector rod head of the stop ejector rod can be used for stretching and retracting in the larger space in the radial direction on the connecting arc of the closing cover, the ejector rod head can be ensured to be completely stretched out, the stop ejector rod is ensured to be used for completely resetting the upper end of the clamping float valve, the float valve cannot be clamped, and the complete resetting of the float valve is further ensured.

The radius from the uncapping connecting arc to the center of the circle is R3, and R3 is not more than R2. The radius of connecting the arc through setting for uncapping is not more than the radius of other connection arcs, guarantees that the ejector pin head of ending the ejector pin has the space that has bigger radial direction on the connection arc of uncapping and can be used to stretch out and draw back, has ensured that the ejector pin head can stretch out completely to end when having guaranteed uncapping the ejector pin and be used for the card to establish the upper end of float valve can reset completely, can not block the float valve, and then guaranteed the complete reset of float valve.

The pot teeth are connected with the inclined plane or the arc-shaped surface of which the connecting arc is smooth. Connect through level and smooth inclined plane or the arcwall face is connected and is making the ejector pin head when following the pot cover and rotate, reduces frictional force for the flexible and level and smooth the reseing of ejector pin head can be level and smooth, guarantees to reset and flexible smooth and easy, prevents the jamming.

The pot body comprises a pot liner and a heat-preservation cover for accommodating the pot liner, and the pot teeth and the connecting arc are arranged on the heat-preservation cover; the upper part of the outer wall of the heat-insulating cover is also sleeved with a heat-insulating ring. The heat insulation ring is arranged on the upper part of the outer side wall of the heat insulation cover, so that the heat of the heat insulation cover is prevented from damaging the contacted outer pot body.

The heat insulation ring comprises a plurality of ring teeth matched with the pot teeth; the ring teeth are connected at intervals through fixed arcs to form heat insulation rings; the plurality of ring teeth comprise positioning ring teeth matched with the positioning pot teeth; the fixed arcs on the two sides of the positioning ring teeth respectively form a cover closing fixed arc and a cover opening fixed arc; a gap is reserved between the cover closing fixing arc and the ejector rod head when the cover closing fixing arc is completely extended out. Through shape and pot tooth and the arc looks adaptation that will insulate against heat the ring, and guarantee to insulate against heat the ring close cover fixed arc with be in and have the clearance between the ejector pin head when stretching out completely, make to close cover fixed arc can not influence the ejector pin head when closing the cover, the pot cover rotates when driving the ejector pin head and rotate, close cover fixed arc card and hinder the ejector pin head, guarantee that the ejector pin head can be complete stretch out, thereby ensure to stop the ejector pin and be used for the card to establish the upper end of float valve can be complete reset, can not block the float valve, and then guaranteed the complete reset of float valve, guaranteed the complete reset of float valve after pressure cooking device closes the cover promptly, ensure safe in utilization.

To circular shape heat preservation cover, the fixed arc has common centre of a circle, radius r1 through setting for will closing the fixed arc of lid is less than the radius r2 of other fixed arcs, has guaranteed that the ejector pin head of the ejector pin of stopping opens the head and has bigger radial ascending space in the direction on the fixed arc of closing the lid and can be used for flexible, has guaranteed that the ejector pin head can stretch out completely, thereby guarantee to stop the ejector pin and be used for the card to establish the upper end of float valve can be complete reset, can not block the float valve, and then guaranteed the complete reset of float valve.

Radius r3 through setting for the fixed arc of will uncapping is not more than the radius of other fixed arcs r2, guarantees that the ejector pin head of the ejector pin of stopping to have the space of bigger radial direction on the fixed arc of uncapping can be used to stretch out and draw back, has ensured that the ejector pin head can stretch out completely to stop when having guaranteed uncapping the ejector pin and be used for the card to establish the upper end of float valve can be complete reset, can not block the float valve, and then guaranteed the complete reset of float valve.

The heat insulation ring is made of glass fiber reinforced nylon material. The composite material of glass fiber and nylon has excellent heat-resisting and fireproof performance and less expansion caused by heating.

Drawings

Fig. 1 is a schematic view of a prior art safety lock of a pressure cooking apparatus.

Fig. 2 is a schematic view of the whole structure of the pressure cooking device of the present invention.

Fig. 3 is a schematic structural view of the lid of the pressure cooking device of the present invention.

Fig. 4 is a schematic structural view of the pot body of the pressure cooking device of the present invention.

Fig. 5 is a schematic structural view of the heat-insulating ring of the pressure cooking device of the present invention.

Fig. 6 is a schematic view of the whole section structure of the pressure cooking device after the heat-insulating ring and the heat-insulating cover are assembled.

In the figure: 100-pot cover, 200-pot body, 300-heat insulation ring, 110-float valve, 120-stop ejector rod, 121-ejector rod head, 130-cover tooth, 210-pot tooth, 220-connecting arc, 230-heat preservation cover, 211-positioning pot tooth, 221-cover closing connecting arc, 222-cover opening connecting arc, 310-ring tooth, 320-fixed arc, 321-cover closing fixed arc and 322-cover opening fixed arc.

Detailed Description

The present invention will be further described with reference to the following specific embodiments, but the present invention is not limited to these specific embodiments. It will be recognized by those skilled in the art that the present invention encompasses all alternatives, modifications, and equivalents as may be included within the scope of the claims.

The first embodiment is as follows:

the pressure cooking device shown in fig. 2-4 comprises a pot cover 100 and a pot body 200; the pot body 200 is provided with a plurality of outward turning pot teeth 210 and connecting arcs 220 for connecting the pot teeth at intervals; the pot cover 100 is provided with a float valve 110, an opening stopping ejector rod 120 and a cover tooth 130 for locking the pot tooth 210; the upper end of the opening stopping ejector rod 120 is used for clamping the float valve 110, and an ejector rod head 121 at the lower end is telescopically arranged on the lower side part of the pot cover 100 in a penetrating way; the plurality of pot teeth 210 comprise positioning pot teeth 211, and connecting arcs 220 on two sides of the positioning pot teeth 211 are respectively formed into a cover closing connecting arc 221 and a cover opening connecting arc 222; there is a gap between the closing cover connecting arc 221 and the ejector head 121 when fully extended. The plurality of pot teeth 210 comprise positioning pot teeth 211, the positioning pot teeth 211 can be small pot teeth with different sizes from other pot teeth, or can be a pot tooth with identification difference, and the positioning pot teeth 211 are used for being matched with the opening stop ejector rod 120 of the pot cover to realize the opening and closing functions. In this embodiment, as shown in fig. 4, the positioning pot teeth 211 are preferably small pot teeth different in size from other pot teeth.

By providing a gap between the head 121 and the closing cover connecting arc 221 when the head 121 is fully extended, namely: on one hand, the ejector rod head 121 is not contacted with the cover closing connecting arc 221 when being completely extended, so that the ejector rod head can be ensured to be completely extended and not blocked by the cover closing connecting arc 221; on the other hand, when the top rod head 121 rotates with the pot cover 100 to close the cover, the top rod head 121 cannot be blocked by the cover closing connecting arc 221 when rotating through the cover closing connecting arc 221, so that the top rod head 121 can freely extend out; in two aspects, the ejector rod head 121 can be completely extended out in the cover closing process and after the cover is closed, so that the part, used for clamping the float valve 110, at the upper end of the opening stopping ejector rod 120 can be completely reset, the float valve 110 cannot be blocked, the complete reset of the float valve 110 is further ensured, namely, the complete reset of the float valve after the cover is closed of the pressure cooking device is ensured, and the use safety is ensured.

As shown in fig. 4, the pot teeth 210 are connected with the connecting arcs 220 in a smooth inclined plane or arc-shaped plane. In this embodiment, the pot teeth 210 and the connection arc 220 are preferably connected by a smooth inclined plane, and the friction force is reduced when the ejector rod head 121 rotates along with the pot cover by the smooth inclined plane connection or the arc-shaped surface connection, so that the ejector rod head 121 can be smoothly stretched and retracted and smoothly reset, and the smooth stretching and retraction are ensured, and the clamping stagnation is prevented.

Example two:

2-4, a plurality of connecting arcs 220 having a common center, wherein the radius from the closing cover connecting arc 221 to the center is R1, and the radius from the remaining connecting arcs to the center is R2; r1 < R2. For the round pot body 200, the radius of the cover closing connecting arc 221 is smaller than the radius of other connecting arcs, so that the ejector rod head 121 of the stop ejector rod 120 is ensured to have larger space in the radial direction on the cover closing connecting arc 221 for stretching, and the ejector rod head 121 can be ensured to extend out completely, thereby ensuring that the upper end of the stop ejector rod 120 used for clamping the float valve 110 can be reset completely, preventing the float valve from being clamped and further ensuring the complete reset of the float valve.

The radius from the uncapping connecting arc 222 to the center of the circle is R3, and R3 is not more than R2. The radius of the uncapping connection arc 222 is not larger than the radius of other connection arcs by setting, the space of the ejector rod head 121 of the open-stop ejector rod 120 in the larger radial direction on the uncapping connection arc 222 can be used for stretching, the ejector rod head 121 can be ensured to be completely extended, and therefore the upper end of the open-stop ejector rod 120 used for clamping the float valve 110 can be completely reset when the uncapping is ensured, the float valve 110 cannot be clamped, and further the complete reset of the float valve 110 is ensured.

Example three:

as shown in fig. 4-6, the pressure cooking device, the pot 200 includes a pot container (not shown) and a heat-preserving cover 230 for accommodating the pot container, the pot teeth 210 and the connecting arc 220 are disposed on the heat-preserving cover 230; in this embodiment, the pot teeth 210 and the connecting arc 220 are disposed on the heat-insulating cover 230, and the cover teeth 130 are locked on the cover teeth of the heat-insulating cover 230, so as to lock the pot cover 100 with the pot body. The upper part of the outer wall of the heat-insulating cover 230 is also sleeved with a heat-insulating ring 300. The heat insulation ring 300 is arranged on the upper part of the outer side wall of the heat insulation cover 230, so that the heat of the heat insulation cover 230 is prevented from damaging the outer pot body.

The heat insulation ring 300 comprises a plurality of ring teeth 310 matched with the pot teeth 210; the ring teeth 310 are connected at intervals through fixed arcs 320 to form an insulation ring 300; the plurality of ring teeth 310 comprise a positioning ring tooth 311 matched with the positioning pot tooth 211; the fixed arcs on the two sides of the positioning ring teeth 311 form an opening cover fixed arc 322 and a closing cover fixed arc 321 respectively; there is a gap between the cover closing retaining arc 321 and the ejector head 121 when fully extended. Since the heat insulating ring 300 is fitted over the outer sidewall of the heat insulating cover 230, the head 121 may partially contact the heat insulating ring 300. Through the shape and the pot tooth 210 and the connection arc 220 looks adaptation with thermal-insulated ring 300, and guarantee that there is the clearance between the fixed arc 321 of closing the lid of thermal-insulated ring 300 and the ejector pin head 121 when being in complete extension, make close fixed arc 321 of lid can not influence ejector pin head 121 when uncapping, when pot lid 100 rotates and drives ejector pin head 121 to rotate promptly, close fixed arc 321 of lid card and hinder ejector pin head 121, guarantee that ejector pin head 121 can be complete extension, thereby ensure to stop that ejector pin 120 is used for the upper end that the card established float valve 110 can reset completely, can not block float valve 110, and then guaranteed the complete reset of float valve 110, the complete reset of float valve after having guaranteed pressure cooking device uncapping promptly, guarantee safe in utilization.

As shown in FIGS. 5 and 6, the thermal insulation ring 300 adapted to the circular thermal insulation cover also has a common center, the radius from the fixed arc 321 to the center of the circular thermal insulation cover is r1, the radius from the other fixed arcs to the center of the circular thermal insulation cover is r2, and r1 is less than r 2. The radius from the cover opening fixing arc 322 to the center of the circle is r3, and r3 is not more than r 2. The radius r1 of the fixed arc 321 of the cover closing is smaller than the radius r2 of other fixed arcs 320, so that the space of the ejector rod head 121 of the stop ejector rod 120 in the larger radial direction on the fixed arc 321 of the cover closing can be used for stretching, and the ejector rod head 121 can be completely extended, thereby ensuring that the upper end of the stop ejector rod 120 used for clamping the float valve 110 can be completely reset, preventing the float valve 110 from being clamped, and further ensuring the complete reset of the float valve 110. Radius r3 through setting for fixed arc 322 of will uncapping is not more than the radius of other fixed arcs r2, guarantee that the ejector pin head 121 of stopping ejector pin 120 has the space that has bigger radial direction on fixed arc 322 of uncapping and can be used for stretching out and drawing back, guaranteed that ejector pin head 121 can stretch out completely, thereby stopped when uncapping ejector pin 120 and be used for the card to establish the reset that the upper end of float valve 110 can be complete, can not block float valve 110, and then guaranteed the complete reset of float valve 110.

In this embodiment, the heat insulation ring 300 is made of glass fiber reinforced nylon. The composite material of glass fiber and nylon has excellent heat-resisting and fireproof performance and less expansion caused by heating. Prolonging the service life of the heat insulation ring 300 and preventing the heat of the heat insulation cover 230 from damaging the outer pot body

Example four:

the pot body 200 comprises a pot liner (not shown in the figure) and a heat preservation cover 230 for accommodating the pot liner, and the pot teeth 210 and the connecting arc 220 are arranged on the heat preservation cover 230; in this embodiment, the pot teeth 210 and the connecting arcs 220 are disposed on the pot liner, and the cover teeth 130 are locked on the cover teeth of the pot liner, that is, the pot cover 100 and the pot body 200 are locked by locking the pot cover 100 on the pot liner in the pot body 200. The upper part of the outer wall of the heat-insulating cover 230 is also sleeved with a heat-insulating ring 300. The heat insulation ring 300 is arranged on the upper part of the outer side wall of the heat insulation cover 230, so that the heat of the heat insulation cover 230 is prevented from damaging the contacted outer pot body.

It should be noted that the above embodiments can be freely combined as necessary. The foregoing has been a detailed description of the preferred embodiments and principles of the present invention, and it will be apparent to those skilled in the art that variations may be made in the specific embodiments based on the concepts of the present invention, and such variations are considered as within the scope of the present invention.

Claims

1. A pressure cooking device comprises a pot cover and a pot body; the pot body is provided with a plurality of outward turning pot teeth and connecting arcs connected with the pot teeth at intervals; the pot cover is provided with a float valve, an opening stopping ejector rod and cover teeth for locking the pot teeth; the upper end of the opening stopping ejector rod is used for clamping the float valve, and an ejector rod head at the lower end of the opening stopping ejector rod is arranged on the lower side part of the pot cover in a telescopic penetrating manner; the method is characterized in that: the pot teeth comprise positioning pot teeth, and connecting arcs on two sides of the positioning pot teeth form a cover closing connecting arc and a cover opening connecting arc respectively; and a gap is reserved between the closing cover connecting arc and the ejector rod head when the closing cover connecting arc is completely extended out.

2. The pressure cooking apparatus of claim 1 wherein said connecting arcs have a common center, said closure connecting arcs having a center-to-center radius of R1, the remaining connecting arcs having a center-to-center radius of R2; r1 < R2.

3. The pressure cooking apparatus of claim 2, wherein the radius from the center of the opening cover connecting arc is R3, R3 ≦ R2.

4. The pressure cooking device of claim 1 wherein said pot teeth are connected to said connecting arc by a smooth slope or an arc.

5. The pressure cooking device of claim 1, wherein the pot body comprises a pot liner and a heat-preserving cover for accommodating the pot liner, and the pot teeth and the connecting arc are arranged on the heat-preserving cover; and the upper part of the outer wall of the heat-insulating cover is also sleeved with a heat-insulating ring.

6. The pressure cooking device of claim 5 wherein said heat insulating ring includes a plurality of ring teeth adapted to fit said pot teeth; the ring teeth are connected at intervals through fixed arcs to form the heat insulation ring; the plurality of the ring teeth comprise positioning ring teeth matched with the positioning pot teeth; the fixed arcs on the two sides of the positioning ring teeth form a cover closing fixed arc and a cover opening fixed arc respectively; and a gap is reserved between the cover closing fixing arc and the ejector rod head when the cover closing fixing arc is completely extended out.

7. The pressure cooking apparatus of claim 6 wherein said fixed arcs have a common center, said closure fixed arcs having a radius r1 from center to center, the remaining fixed arcs having a radius r2 from center to center, r1 < r 2.

8. The pressure cooking apparatus of claim 7, wherein the radius of the opening cover fixing arc to the center of the circle is r3, r3 ≦ r 2.

9. The pressure cooking device of claim 5 wherein said heat shield ring is a fiberglass reinforced nylon material.

10. Pressure cooking device according to any one of the claims 1-9, characterised in that the lid is detachably connected to the body.