CN211748810U - Pressure cooking utensil - Google Patents

Abstract

The utility model relates to a kitchen cooking appliance, especially a pressure cooking utensil, including the airtight container who has the pressure cavity, its characterized in that: the safety valve assembly comprises a fixing support, a valve core and a sealing ring, wherein the fixing support is mounted on the outer side of the mounting hole, the front end of the valve core penetrates through the mounting hole, the sealing ring is sleeved on the outer side of the valve core, the rear end of the valve core is supported by the fixing support, the sealing ring is used for sealing a gap between the mounting hole and the valve core, when the pressure in the pressure cavity exceeds a preset threshold value, the valve core is pushed out of the mounting hole, and the pressure cavity is communicated with the external atmosphere. The utility model discloses an effectual pressure of having guaranteed the pressure chamber internal of food preparation machine surpasss when predetermineeing the threshold value, and the case can be released from the mounting hole, realizes safe pressure release.

Description

Pressure cooking utensil

Technical Field

The utility model relates to a kitchen cooking appliance, especially a pressure cooking utensil.

Background

The pressure cooker comprises a pressure cooker body, a pressure release valve device, a pressure release valve and a pressure release valve device. When the pressure relief valve is blocked or the pressure in the cooker rises sharply and the pressure relief valve can not quickly relieve the pressure in the cooker to working pressure, the safety valve arranged on the cooker cover is opened to relieve the pressure, the safety valve has the effect of ensuring the safety pressure relief of the pressure cooker without explosion, and the pressure relief valve is an unrecoverable pressure relief valve. Meanwhile, the applicant applies a patent number of CN201110102249.X before the applicant, the name of the invention is micro-pressure self-curing soybean milk machine and a micro-pressure soybean milk making process thereof, the patent specification discloses that a control valve is arranged on an outlet pipe to control the opening and closing of a communicating hole, so that the pressure of a crushing and curing device is adjustable, and a safety valve is also arranged on the crushing and curing device, and when the pressure of an inner cavity of the crushing and curing device reaches a certain pressure value, the safety valve can be flushed by the pressure to realize the communication and the pressure relief with the external atmosphere. However, the pressure relief combination of the limit type pressure relief valve and the unrecoverable safety valve of the electric pressure cooker or the pressure relief combination of the control valve and the safety valve which are arranged on the micro-pressure soybean milk machine and can realize automatic pressure regulation are mutually independent pressure relief safety devices, so that the problems of complex pressure relief structure, more parts, high assembly difficulty and high manufacturing cost of the pressure cooking appliance are inevitably caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to reach provides a pressure cooking utensil that can be when the pressure in the pressure chamber surpassed preset threshold, and the case can be released from the mounting hole, realizes safe pressure release.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a pressure cooking appliance comprising a closed container having a pressure chamber, characterized in that: the safety valve assembly comprises a fixing support, a valve core and a sealing ring, wherein the fixing support is mounted on the outer side of the mounting hole, the front end of the valve core penetrates through the mounting hole, the sealing ring is sleeved on the outer side of the valve core, the rear end of the valve core is supported by the fixing support, the sealing ring is used for sealing a gap between the mounting hole and the valve core, when the pressure in the pressure cavity exceeds a preset threshold value, the valve core is pushed out of the mounting hole, and the pressure cavity is communicated with the external atmosphere.

Furthermore, the valve core is positioned outside the mounting hole, the sealing ring is provided with a flange edge extending towards the outer wall of the pressure cavity, the fixed support compresses the flange edge on the outer wall of the pressure cavity, and when the pressure in the pressure cavity exceeds a preset threshold value, the valve core is pushed out of the sealing ring.

Furthermore, the outer wall of the valve core is provided with a mounting groove, and the sealing ring is hooped on the mounting groove.

Further, the fixed support is a fixed cylinder, the valve core is installed in the fixed cylinder, a communicating port for exhausting is formed in the fixed cylinder, and after the valve core is separated from the installation hole, the communicating port communicates the pressure cavity with the atmosphere.

Further, the communicating opening is provided with an exhaust pipe communicated with the atmosphere.

Furthermore, the fixed support is a fixed cylinder, the valve core is installed in the fixed cylinder, a support hole penetrating through the fixed cylinder is formed in the rear end wall of the fixed cylinder, the rear end of the valve core extends out of the support hole, and a leakage-proof sealing ring is sleeved at the rear end of the valve core to seal the support hole.

Furthermore, the valve core comprises an installation cylinder with a pressure relief channel and two ends penetrating through the installation cylinder, a pressure relief valve core installed in the pressure relief channel and sealing a front end hole of the installation cylinder, a guide part fixed at a rear end hole of the installation cylinder, and a first reset spring with one end abutting against the guide part and the other end abutting against the pressure relief valve core, wherein the installation cylinder penetrates through the installation hole, and a pressure relief hole for communicating the pressure relief channel with the external atmosphere is formed in the peripheral wall of the installation cylinder.

Further, the pressure relief valve core comprises a pressure relief valve core body and a blocking head arranged at the front end of the pressure relief valve core body, the blocking head is used for blocking a front end hole of the installation cylinder, and the end part of the first reset spring abuts against the pressure relief valve core body;

or the front end of the guide component and the mounting cylinder are screwed in threads;

or, an avoiding groove is arranged on the peripheral wall of the guide component.

Further, when the pressure in the pressure cavity exceeds a preset threshold value, the sealing ring and the valve core are separated from the mounting hole together.

Furthermore, a second return spring is arranged between the valve core and the fixed support.

After the technical scheme is adopted, the mounting hole is formed in the cavity wall of the pressure cavity, the safety valve assembly is mounted at the mounting hole in a sealing mode, the valve core of the safety valve assembly penetrates through the mounting hole, and when the pressure in the pressure cavity exceeds a preset threshold value, the valve core can be ejected out of the mounting hole by the gas in the pressure cavity, so that the pressure cavity is communicated with the external atmosphere through the mounting hole, the safety pressure relief and exhaust are achieved, and the safety performance of pressure container cooking is effectively improved.

Additionally, the utility model discloses a food preparation machine, when pressure in the pressure chamber is less than predetermineeing safe threshold and is greater than predetermineeing the work threshold, relief valve assembly still has the automatic pressure release function of recoverable formula, compares in current mutually independent dual relief valve structure, the utility model discloses a relief valve assembly is with the effectual combination of function of traditional limit formula relief valve and the relief valve of unrecoverable formula as an organic whole, has simplified the design of valve body greatly, and the structure is compacter, and assembly process is simpler, and manufacturing cost is lower.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is a schematic structural view of the safety valve assembly of FIG. 1;

FIG. 4 is an exploded schematic view of the safety valve assembly of FIG. 3;

fig. 5 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 6 is an enlarged schematic view at B of FIG. 5;

FIG. 7 is a schematic view of the safety valve assembly of FIG. 5 mounted to a cup;

FIG. 8 is an exploded view of the safety valve assembly of FIG. 5;

fig. 9 is a schematic structural diagram of a third embodiment of the present invention;

fig. 10 is an enlarged schematic view at C in fig. 9.

Detailed Description

The first embodiment is as follows:

as shown in fig. 1, fig. 2, fig. 3, and fig. 4, the first embodiment of the present invention is schematically illustrated. A food processor comprises a machine body 1, a cup body 2 arranged in the machine body 1 and a cover body 3 matched with the cup body 2 in a sealing way, wherein the cup body 2 and the cover body 3 are enclosed to form a closed container with a pressure cavity 10, an electric appliance part is arranged at the bottom of the pressure cavity 10 and is a motor (not shown in the figure), a driving shaft 41 driven by the motor penetrates through the bottom of the cup body 2 and extends into the cup body 2, a crushing device 5 used for crushing materials is arranged in the pressure cavity 10, the crushing device 5 is arranged at the tail end of the driving shaft 41, and the food processor further comprises:

a mounting hole 20 penetratingly provided in a peripheral wall of the cup body 2;

the safety valve assembly 6 is arranged on the outer side of the cup body 2, is hermetically arranged at the mounting hole 20 and is used for relieving the pressure of the gas in the pressure cavity 10;

the blocking piece 7 is movably arranged on the outer side of the cup body 2, and the blocking piece 7 is provided with an avoiding position and a blocking position; the safety valve assembly 6 and the blocking member 7 are mounted in the machine body 1 in a concealed manner.

When the cover body 3 is in a cover closing state, the blocking piece 7 moves to an avoiding position, and when the pressure in the pressure cavity 10 exceeds a preset safety threshold value, the safety valve assembly 6 can be separated from the mounting hole 20; when the cover body 3 is in an uncapped state, the blocking piece 7 moves to a blocking position, and the blocking piece 7 blocks the safety valve assembly 6 from being detached from the mounting hole 20.

In this embodiment, a trigger is arranged on the lid 3, when the lid 3 and the cup body 2 are closed and opened, the trigger triggers the blocking member 7 to move, wherein the trigger is a first magnetic body 31 arranged on the lid 3, a second magnetic body 71 magnetically matched with the first magnetic body 31 is arranged on the blocking member 7, and when the lid 3 and the cup body 2 are closed, the first magnetic body 31 drives the second magnetic body 71 to move, so that the second magnetic body 71 drives the blocking member 7 to move. In this embodiment, the first magnetic member 31 and the second magnetic member 71 are two magnetically attracted magnets, and when the lid 3 and the cup 2 are closed, the blocking member 7 moves upward to the avoiding position under the magnetic attraction of the second magnetic member 71.

Meanwhile, in the embodiment, the safety valve assembly 6 includes a fixing bracket 61 installed outside the installation hole 20, a valve core 62 with a front end penetrating into the installation hole 20, and a sealing ring 63 sleeved outside the valve core 62, the rear end of the valve core 62 is supported by the fixing bracket 61, the sealing ring 63 is used for sealing a gap between the installation hole 20 and the valve core 62 and is located outside the installation hole 20, the sealing ring 63 has a flange 631 extending towards the outer wall of the cup body 2, the fixing bracket 61 presses the flange 631 onto the cup body 2, the blocking member 7 is located at the rear end of the valve core 62 to block the valve core 62 from being separated from the installation hole 20 when the lid body 3 is in an uncapped state, and the valve core 62 is separated from the sealing ring 63 when the pressure in the pressure chamber 10 exceeds a preset safety threshold. In order to increase the friction force between the valve core 62 and the sealing ring 63 and facilitate the installation of the sealing ring 63 and the valve core 62, an installation groove 621 is further provided on the outer wall of the valve core 62, and the sealing ring 63 is tightened on the installation groove 621. In the present embodiment, the fixed bracket 61 is a fixed cylinder, the valve core 62 is mounted in the fixed cylinder, and the fixed cylinder is provided with a communication port 610 for exhausting air, and after the valve core 62 is detached from the mounting hole 20, the communication port 610 communicates the pressure chamber 10 with the atmosphere, wherein in the present embodiment, the communication port 610 is connected to a waste water box (not shown) of the food processor through an exhaust pipe (not shown). Meanwhile, a through supporting hole 611 is formed in the rear end wall of the fixed cylinder, the rear end of the valve core 62 extends out of the supporting hole 611, and a leakage-proof sealing ring 612 is sleeved at the rear end of the valve core 62 to seal the supporting hole 611.

In this embodiment, the supporting hole 611 has a supporting and guiding function for the valve core 62, so that the valve core 62 can better slide in the fixed cylinder after being separated from the mounting hole 20. Since the slurry in the pressure chamber 10 may enter the fixed cylinder through the mounting hole 20 and be discharged into the waste water box through the communicating port 610 and the exhaust pipe after the valve core 62 is separated from the mounting hole 20, in this embodiment, the leakproof seal ring 612 is installed at the support hole 611 to prevent the slurry in the pressure chamber 10 from flowing into the machine body 1 through the support hole 611, which causes the problem that the machine body 1 cannot be cleaned and bacteria is easy to grow after long-term use. In this embodiment, the blocking member 7 located at the rear end of the valve core 62 is cylindrical, and a avoiding hole 70 is formed in one side facing the valve core 62, when the blocking member 7 is in the avoiding position, the avoiding hole 70 faces the valve core 62, and when the valve core 62 is separated from the mounting hole 20, the rear end of the valve core 62 can penetrate through the avoiding hole 70 and enter the hollow cavity of the blocking member 7.

In the prior art, similar to the unrecoverable safety valve assembly installed in this embodiment, when the safety valve assembly is in an uncapped state, since the valve core of the safety valve assembly is inserted into the installation hole, when pressure is applied to the valve core, the valve core can be separated from the installation hole, thereby easily causing failure of the safety valve assembly in a non-operating state.

Therefore, in this embodiment, a movable blocking part is arranged in the machine body, and the movement of the blocking part is driven by a trigger part arranged on the cover body, so that when the cover body is closed, the blocking part is driven to an avoiding position by the trigger part, at this time, if the air pressure in the pressure cavity exceeds a preset safety threshold value, the valve core can be pushed out from the sealing ring by the steam in the pressure cavity, the safety pressure relief is realized, and the cooking safety of the closed container is ensured. When the cover body is opened, the blocking piece is driven by the trigger piece to the blocking position just at the rear end of the valve core, at the moment, even if pressure is applied to the front end of the valve core, the valve core still cannot be separated from the mounting hole under the blocking of the blocking piece, the occurrence of manual misoperation is effectively prevented, and the reliability of the safety valve assembly is greatly improved.

It should be noted that, for the present embodiment, the sealing ring may also have no outward flange, and at this time, when the pressure in the pressure cavity exceeds the preset safety threshold, the sealing ring may also be separated from the mounting hole together with the valve element.

The preset safety threshold in this embodiment is the maximum pressure value that the sealed container can bear, and the pressure value exceeds the preset working threshold when the food processor cooks normally, and at this time, the sealed container has a risk of explosion. In the design process, the preset safety threshold value and the valve core overcome the blocking force and the friction force with the sealing ring and the leakage-proof sealing ring, and when the valve core can be separated from the mounting hole, the required pressure value is equal, and the preset safety threshold value can be determined according to the design requirements of designers. Meanwhile, it should be noted that, in this embodiment, the trigger element may not be disposed on the cover body to drive the blocking element to move, or a driving mechanism electrically connected to the control device may be directly disposed in the machine body, and when the cover body is closed, the control device is used to automatically control the driving mechanism to move, so as to achieve the blocking and avoiding of the safety valve assembly.

It should be noted that, for this embodiment, a mounting hole may be formed in the cover body, the safety valve assembly and the blocking member may be mounted on the cover body, and meanwhile, a triggering member may be disposed on the cup body, and when the cover body and the cup body are closed and opened, the triggering member may trigger the blocking member to move. In addition, for this embodiment, the food processor may also be an electric pressure cooker, in which case, the electrical component is a heating device installed on the inner container of the electric pressure cooker, and when the cover body and the inner container are closed, the blocking member may trigger the heating device to be powered on, or when the cover body and the inner container are opened, the blocking member may trigger the heating device to be powered off.

In addition, for this embodiment, the valve element of the safety valve assembly is of an unrecoverable structure, and of course, the safety valve assembly in this embodiment may also be designed as a recoverable pressure relief valve structure, for example, a second return spring is disposed between the valve element and the fixing support, when the air pressure in the pressure chamber exceeds a preset working threshold, the valve element opens the mounting hole to release the pressure of the gas in the pressure chamber, and when the air pressure in the pressure chamber is smaller than the preset working threshold, the valve element seals the mounting hole under the elastic force of the second return spring. It should be noted that the preset threshold in this embodiment includes a preset safety threshold when the safety valve assembly is an unrecoverable safety valve, and a preset working threshold when the safety valve assembly is a recoverable pressure relief valve. Moreover, when the safety valve assembly is a recoverable relief valve, the rear side of the safety valve assembly does not need to be blocked by a blocking piece.

It should be noted that the above structural changes of the present embodiment can also be applied to other embodiments of the present invention.

Example two:

as shown in fig. 5, 6, 7 and 8, the structure of the second embodiment of the present invention is schematically illustrated. The difference between the present embodiment and the first embodiment is: in this embodiment, the first magnetic body 31 and the second magnetic body 71 are two magnets with repelling magnetism, and when the lid 3 and the cup body 2 are closed, the blocking member 7 is driven by the second magnetic body 71 to move downward to the avoiding position. And, the below of blockking 7 is provided with safety switch 8, and this safety switch 8 is micro-gap switch for control motor switching on and off, and wherein, micro-gap switch includes shell fragment 81 and contact switch 82, and when blockking 7 downstream to dodging the position, blockking 7 and pressing shell fragment 81 and contact switch 82, contact switch 82 triggers the motor circular telegram. When the cover body 3 is opened, the first magnetic body 31 is far away from the second magnetic body 71, the elastic sheet 81 drives the blocking piece 7 to rebound upwards, the contact switch 82 triggers the motor to power off, and the blocking piece 7 moves to a blocking position.

Meanwhile, in this embodiment, the valve core includes an installation cylinder 622 having a pressure relief channel 620 and two ends penetrating through, a pressure relief valve core 623 installed in the pressure relief channel 620 and sealing a front end hole of the installation cylinder 622, a guide member 624 fixed at a rear end hole of the installation cylinder 622, and a first return spring 625 having one end abutting against the guide member 624 and the other end abutting against the pressure relief valve core 623, the installation cylinder 622 is installed in the installation hole 20 in a penetrating manner, a pressure relief hole 626 for communicating the pressure relief channel 620 with an inner cavity of the fixed bracket 61 (fixed cylinder) is formed in a peripheral wall of the installation cylinder 622, and gas in the pressure cavity 10 can enter the pressure relief channel 620 through the front end hole of the installation cylinder 622 and then enter the inner cavity of the fixed bracket 61 (fixed cylinder) through the pressure relief hole 626, and is discharged to the atmosphere from a communication port 610 formed in the fixed bracket. In this embodiment, the fixing bracket 61 is further provided with a mounting portion 615, and the safety switch 8 is fixed on the mounting portion 615.

In addition, in this embodiment, the pressure relief valve core 623 includes a pressure relief valve core body 6231 and a blocking head 6232 installed at the front end of the pressure relief valve core body 6231, where the blocking head 6232 is a silicon rubber member and is used for blocking the front end hole of the installation cylinder 622, and the end of the first return spring 625 abuts against the pressure relief valve core body 6231. Meanwhile, the guide member 624 is a guide rod, the front end of the guide rod 624 is screwed with the mounting cylinder 622 through a screw (not shown), and an annular escape groove 6240 is formed in the peripheral wall of the guide rod.

In the present embodiment, the blocking member 7 is provided with a supporting protrusion 72 for supporting the guiding member 624 after the valve core is separated, below the avoiding hole 70, wherein after the valve core is separated from the mounting hole, the guiding member 624 extends into the inner cavity of the blocking member 7 through the avoiding hole 70, and the supporting protrusion 72 is inserted into the avoiding groove 6240. For the embodiment, if the avoiding groove 6240 is not formed in the guiding component 624, after the valve core is separated, due to the limit influence of the supporting hole in the fixing support 61, the elastic piece 81 cannot drive the guiding component 624 and the blocking component 7 to rebound and reset upwards, at this time, the guiding component 624 and the blocking component 7 are in a state of pressing and holding the elastic piece 81 and the contact switch 82 downwards together, the safety switch 8 always triggers the motor to be powered on, and thus when the cover is opened, the motor is still in a motion state of driving the crushing device to rotate, and potential safety hazards exist in the use of consumers. Therefore, in this embodiment, the peripheral wall of the guide member 624 is provided with the avoiding groove 6240, when the guide member 624 extends into the inner cavity of the blocking member 7, the supporting protrusion 72 is inserted into the avoiding groove 6240, a movable gap is provided between the supporting hole of the fixing bracket 61 and the avoiding groove 6240, the elastic piece 81 can drive the blocking member 7 and the guide member 624 to rebound and reset together, so that the contact switch 82 powers off the motor, and the pulverizing device stops rotating.

For the food processor of the embodiment, when the cover is closed or opened, the action of the safety switch can be triggered by the movement of the barrier piece, so that the functions of electrifying the motor when the cover is closed and powering off the motor and stopping the crushing device when the cover is opened are realized, and the personal safety of consumers is fully ensured.

In addition, the food preparation machine of this embodiment, when pressure in the pressure chamber is less than preset safe threshold and is greater than preset working threshold, the relief valve subassembly still has the automatic pressure release function of recoverable formula, compare in current mutually independent dual relief valve structure, the relief valve subassembly of this embodiment combines into an organic whole traditional limit value formula relief valve with the effectual combination of function of the relief valve of unrecoverable formula, the design of the valve body has been simplified greatly, the structure is compacter, assembly process is simpler, manufacturing cost is lower.

Meanwhile, the present embodiment also has the same beneficial effects as the first embodiment, and the description thereof is omitted here. It should be noted that the structural changes to the present embodiment can also be applied to other embodiments of the present invention.

Example three:

as shown in fig. 9 and 10, the structure of the third embodiment of the present invention is schematically illustrated. The present embodiment is different from the above embodiments in that: in this embodiment, the cover 3 is screwed on the cup body 2, the triggering member is a touch rod 32 disposed on the cover 3, a compression spring 33 is disposed at the rear portion of the touch rod 32, and when the cover 3 is screwed in place, the compression spring 33 pushes the touch rod 32 to press the blocking member 7, so that the blocking member 7 moves downward to an avoiding position.

Meanwhile, in this embodiment, a through hole 11 is further formed in the wall of the machine body 1 above the blocking member 7, when the cover body 3 is screwed and locked in place, the touch rod 32 is pushed by the compression spring 33 to press the blocking member 7 by penetrating through the through hole 11, and when the cover body 3 is rotated and unlocked, the touch rod 32 reversely extrudes the compression spring 33, the touch rod 32 is separated from the blocking member 7, and the blocking member 7 returns to the blocking position under the action of the elastic piece.

For the embodiment, a structure for facilitating the release of the touch bar from the through hole is required to be disposed on the touch bar, and the description is not extended here. It should be noted that the cover in this embodiment may also be a flip structure that is opened by flipping relative to one side of the cup body, at this time, the touch rod is disposed on one side of the cover away from the rotating shaft, and at this time, the rear end of the touch rod may not be provided with the compression spring.

It should be noted that the above structural changes of the present embodiment can be applied to other embodiments of the present invention.

It should be further noted that the food processor of the present invention can be a soybean milk maker with a frame structure, and can also be a wall breaking machine with a underneath type motor. Meanwhile, the food processor of the utility model can also be a kitchen appliance such as an electric pressure cooker with pressure cooking function. Furthermore, the utility model discloses can the direct mount heating device on food preparation machine's the cup, perhaps food preparation machine has the steam heating device that heats the thick liquid in the cup.

It will be appreciated by those skilled in the art that the present invention includes, but is not limited to, those illustrated in the drawings and described in the detailed description above. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (10)

1. A pressure cooking appliance comprising a closed container having a pressure chamber, characterized in that: the safety valve assembly comprises a fixing support, a valve core and a sealing ring, wherein the fixing support is mounted on the outer side of the mounting hole, the front end of the valve core penetrates through the mounting hole, the sealing ring is sleeved on the outer side of the valve core, the rear end of the valve core is supported by the fixing support, the sealing ring is used for sealing a gap between the mounting hole and the valve core, when the pressure in the pressure cavity exceeds a preset threshold value, the valve core is pushed out of the mounting hole, and the pressure cavity is communicated with the external atmosphere.

2. Pressure cooking appliance according to claim 1, characterized in that: the valve core is positioned at the outer side of the mounting hole, the sealing ring is provided with a flange edge extending towards the outer wall of the pressure cavity, the fixed support compresses the flange edge on the outer wall of the pressure cavity, and when the pressure in the pressure cavity exceeds a preset threshold value, the valve core is pushed out from the sealing ring.

3. Pressure cooking appliance according to claim 1, characterized in that: the outer wall of the valve core is provided with an installation groove, and the sealing ring is hooped on the installation groove.

4. Pressure cooking appliance according to claim 1, characterized in that: the fixed support is a fixed cylinder, the valve core is arranged in the fixed cylinder, a communicating port for exhausting is arranged on the fixed cylinder, and after the valve core is separated from the mounting hole, the communicating port communicates the pressure cavity with the atmosphere.

5. Pressure cooking appliance according to claim 4, characterized in that: and an exhaust pipe communicated with the atmosphere is arranged at the communication port.

6. Pressure cooking appliance according to claim 1, characterized in that: the fixed support is a fixed cylinder, the valve core is arranged in the fixed cylinder, a penetrating support hole is formed in the rear end wall of the fixed cylinder, the rear end of the valve core extends out of the support hole, and a leakage-proof sealing ring is sleeved at the rear end of the valve core to seal the support hole.

7. Pressure cooking appliance according to claim 1, characterized in that: the valve core comprises an installation barrel with a pressure relief channel and two ends penetrating through the installation barrel, a pressure relief valve core installed in the pressure relief channel and sealing a front end hole of the installation barrel, a guide part fixed at the rear end hole of the installation barrel, and a first reset spring with one end abutting against the guide part and the other end abutting against the pressure relief valve core, wherein the installation barrel penetrates through the installation hole, and the peripheral wall of the installation barrel is provided with a pressure relief hole communicating the pressure relief channel with the outside atmosphere.

8. Pressure cooking appliance according to claim 7, characterized in that: the pressure relief valve core comprises a pressure relief valve core body and a blocking head arranged at the front end of the pressure relief valve core body, the blocking head is used for blocking a front end hole of the installation cylinder, and the end part of the first reset spring is abutted against the pressure relief valve core body;

or the front end of the guide component and the mounting cylinder are screwed in threads;

or, an avoiding groove is arranged on the peripheral wall of the guide component.

9. Pressure cooking appliance according to claim 1, characterized in that: when the pressure in the pressure cavity exceeds a preset threshold value, the sealing ring and the valve core are separated from the mounting hole together.

10. Pressure cooking appliance according to claim 1, characterized in that: and a second return spring is arranged between the valve core and the fixed support.

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