A high-reliable pressure-limiting exhaust structure of a pressure cooker

Abstract

The utility model relates to a kind of high-reliability pressure-limited pressure cooker exhaust structure, including pressure-limiting valve and exhaust pipe, the outer thread is only set in the gas outlet end outer periphery of exhaust pipe, the small diameter size of the outer thread is greater than the non-gas outlet end size of exhaust pipe, the pressure-limiting valve includes coaxially arranged inner valve body and outer valve body, the outer valve body is fixedly sleeved in the outer periphery of the inner valve body, the inside of the inner valve body is formed with accommodating cavity, the bottom of the inner valve body is provided with the opening being communicated with accommodating cavity, the opening is fixedly provided with insert, the center of the insert is provided with the internal thread being matched with the outer thread, valve tip is fixedly arranged in the accommodating cavity, the gas outlet end of exhaust pipe is inserted into accommodating cavity. After using such scheme, the risk that pressure-limiting valve is accidentally dropped due to snap spring fatigue or improper operation is fundamentally eliminated by using thread structure, and the safety and connection reliability are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of high pressure limiting valve technology, and in particular to a highly reliable pressure limiting and venting structure for a pressure cooker. Background Technology

[0002] Pressure cookers are a common kitchen appliance widely used for their ability to quickly cook food. During operation, high pressure is generated inside the pressure cooker. To ensure safety, a pressure-limiting and venting structure is usually installed. When the pressure inside the cooker exceeds a set value, this structure can automatically release pressure and prevent excessive pressure from causing safety accidents.

[0003] In existing technology, a common pressure-limiting venting structure uses a pressure-limiting valve and a retaining spring for fixing. Specifically, the pressure-limiting valve is attached to the vent pipe of the pot lid by a retaining spring, and the installation and positioning of the pressure-limiting valve is achieved by the elastic deformation of the retaining spring. However, this structure has many drawbacks in practical use.

[0004] First, as a metal elastic component, the retaining ring is prone to fatigue deformation or elastic failure under repeated use in high-temperature and humid environments, leading to a decrease in its clamping force. This poses a risk of the pressure relief valve accidentally falling off during use, seriously affecting the safety and reliability of the pressure cooker. Second, users need to frequently remove and install the pressure relief valve during daily cleaning or maintenance. The retaining ring structure requires a high degree of force and angle control; improper operation can easily cause deformation, breakage, or permanent damage to the retaining ring, resulting in the failure of the pressure relief function. Utility Model Content

[0005] The technical problem this invention aims to solve is to provide a highly reliable pressure-limiting and venting structure for a pressure cooker. By utilizing a threaded structure, the risk of the pressure-limiting valve accidentally falling off due to spring fatigue or improper operation is fundamentally eliminated, greatly improving safety and connection reliability. At the same time, this structure relies on the weight of the pressure-limiting valve to achieve sealing, and can lift and release pressure when the pressure exceeds the limit. The operation is stable and reliable, and the threaded connection makes installation and disassembly simple and intuitive, easy for users to clean and maintain daily, and effectively reduces the risk of operational damage.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] A highly reliable pressure-limiting and venting structure for a pressure cooker includes a pressure-limiting valve and a venting pipe. The venting pipe has an external thread only on the outer periphery of its outlet end, and the minor diameter of the external thread is larger than the size of the non-outlet end of the venting pipe. The pressure-limiting valve includes an inner valve body and an outer valve body arranged coaxially. The outer valve body is fixedly sleeved on the outer periphery of the inner valve body. The inner valve body has a receiving cavity inside, and an opening communicating with the receiving cavity is provided at the bottom of the inner valve body. An insert is fixedly provided at the opening, and the center of the insert has an internal thread that can mate with the external thread. A valve tip is fixedly provided in the receiving cavity. The outlet end of the venting pipe extends into the receiving cavity. Under the weight of the pressure-limiting valve, the valve tip is pressed against the outlet end of the venting pipe to form a seal. The pressure-limiting valve can move axially along the venting pipe to disengage from or press against the outlet end of the venting pipe to achieve venting or sealing. The inlet end of the venting pipe is located outside the pressure-limiting valve. Specifically, the external thread has a limited axial length and its end is interrupted in the axial direction. In this way, when the pressure relief valve is screwed into the exhaust pipe, the internal thread is screwed into the external thread and pushed forward. When it reaches the end of the external thread, the internal thread can be slid out and disengaged by continuing to rotate the pressure relief valve, so that the exhaust end of the exhaust pipe can be extended into the receiving cavity.

[0008] The specific principle of this application is as follows: By setting an external thread at the exhaust pipe outlet and an insert with an internal thread in the inner valve body of the pressure relief valve, the exhaust pipe outlet can be installed into the receiving cavity of the inner valve body through a thread engagement action. First, when installing the pressure relief valve onto the exhaust pipe, align the external and internal threads. Then, continuously rotate the pressure relief valve; the internal thread inside the valve will screw into the external thread. Since the non-exhaust pipe end is smaller than the minor diameter of the external thread, when the pressure relief valve rotates to a certain depth, the internal thread will disengage from the external thread, allowing the exhaust pipe outlet to be located within the receiving cavity. The pressure relief valve can then move along the axial direction of the exhaust pipe, at which point the pressure relief valve and exhaust pipe are installed. Due to the pressure relief valve's own weight, the internal thread will move away from the external thread after installation. When it is necessary to disassemble the pressure relief valve, the external and internal threads must be aligned and rotated in opposite directions to unscrew it. This structural design prevents the pressure relief valve from easily detaching from the exhaust pipe, ensuring safe use.

[0009] This application's structure abandons the traditional snap-fit ​​connection method, fundamentally avoiding the problem of accidental detachment of the pressure relief valve due to snap-fit ​​fatigue, deformation, or breakage, and significantly improving the connection strength and long-term reliability of the pressure relief and exhaust structure. At the same time, the threaded connection method simplifies installation and disassembly, requires less force and angle, facilitates daily cleaning and maintenance, and effectively reduces the risk of structural damage due to improper operation.

[0010] Meanwhile, the pressure relief valve relies on its own weight to press and seal at the exhaust pipe outlet, achieving a normal seal. When the pressure inside the pressure cooker exceeds the set value, the steam pressure overcomes the valve's own weight, pushing the valve tip to lift the entire valve. At this time, the valve tip simultaneously disengages from the exhaust port, and steam enters the receiving cavity through the exhaust pipe and exits from the opening, achieving automatic pressure relief. After the pressure decreases, the pressure relief valve automatically falls back to its original position, ensuring reliable sealing and stable operation, thus guaranteeing the safety and pressure control performance of the pressure cooker during use. Furthermore, the coaxial arrangement of the inner and outer valve bodies further ensures the smoothness of the vertical movement of the pressure relief valve, avoiding problems such as poor sealing or jamming caused by skewness.

[0011] To achieve the functions of both external and internal threads, this application provides two implementation schemes:

[0012] Option 1: The insert includes a stainless steel plate with a centrally located internal thread. Multiple snap-fits are spaced circumferentially along the edge of the stainless steel plate, and multiple slots are spaced circumferentially along the lower end of the inner valve body. Each slot corresponds to one of the snap-fits and engages with the others. The use of a stainless steel plate improves durability, and the interlocking of the multiple circumferentially spaced snap-fits and slots achieves a large-area mechanical interlock between the insert and the inner valve body. This distributed connection effectively distributes the circumferential torque generated during thread engagement and disengagement throughout the entire inner valve body, avoiding stress concentration and significantly enhancing the torsional strength and stability of the insert installation, preventing loosening or detachment during repeated tightening or disengagement.

[0013] The stainless steel plate features vent holes, with its bottom surface flush with the bottom surface of the inner valve body. This vent hole creates a direct, unobstructed, and unblockable outlet path for the high-pressure steam. Once the steam pushes up the pressure relief valve, it can be quickly discharged through the vent holes, significantly optimizing venting efficiency. Furthermore, the flush structure between the bottom surface of the stainless steel plate and the bottom surface of the inner valve body effectively reduces the accumulation of dirt, water stains, or food residue at the interface during use, significantly improving the product's hygiene and ease of cleaning.

[0014] Option 2: The insert includes a stainless steel threaded sleeve with a centrally located internal thread. The outer wall of the stainless steel threaded sleeve has a circumferentially extending groove, and a protrusion is provided within the receiving cavity. The groove and the protrusion are tightly fitted together. Option 2's insert (stainless steel threaded sleeve) uses a "groove-protrusion" tight-fitting method, eliminating the need for additional axial space for the engagement mechanism as required by snap-fit ​​structures. The entire fixing structure is fully integrated within the radial wall thickness of the threaded sleeve and the wall thickness of the valve body, resulting in a very compact structure. This facilitates the miniaturization of the pressure relief valve as a whole, or allows for more space for other functional components (such as more exhaust channels) within the same external dimensions. Furthermore, the stainless steel threaded sleeve used in Option 2 can be a commercially available product, eliminating the need for threading the stainless steel plate as in Option 1. This simplifies the manufacturing process, reduces production costs, and avoids the problems of high processing difficulty and low yield in the machining of small metal parts, making it more suitable for mass production.

[0015] Preferably, the inner valve body is made of plastic. This allows for the pre-positioning of a threaded metal insert within the mold during injection molding, achieving a secure bond between the insert and the inner valve body through integral injection molding. This process not only creates a tight mechanical anchor between the insert and the plastic substrate, effectively preventing loosening or rotation during use, but also significantly improves product consistency and assembly precision. Compared to traditional integrally machined metal inner valve bodies, this solution significantly reduces processing difficulty and manufacturing costs while ensuring pressure and temperature resistance, while also achieving a lightweight structure, thus enhancing the user experience.

[0016] Preferably, the size of the receiving cavity is larger than the size of the exhaust pipe outlet end. This provides ample guiding space and assembly tolerance for the exhaust pipe outlet end to smoothly extend into the receiving cavity during installation. Simultaneously, during the operation of the pressure relief valve, this gap structure allows the exhaust pipe outlet end to maintain a certain degree of axial freedom of movement within the receiving cavity, facilitating automatic alignment of the sealing surface between the valve tip and the outlet end, compensating for minor misalignments caused by machining errors or thermal deformation, thereby improving sealing reliability. Furthermore, this gap can also serve as part of an auxiliary exhaust channel, guiding the uniform diffusion of steam during high-pressure exhaust, reducing localized erosion, and extending the service life of the components.

[0017] Preferably, the device further includes a pressure-limiting valve cap, which is fitted and fixed to the upper end of the inner valve body. The lower end of the inner valve body extends radially outward to form a step. The outer valve body is fitted around the outer periphery of the inner valve body, with its lower end resting on the step. The pressure-limiting valve cap presses against the upper end of the outer valve body from above, axially fixing the outer valve body between the step and the pressure-limiting valve cap. This forms a complete pressure-limiting valve structure, enhancing the overall compactness and sealing performance, and facilitating user handling and operation.

[0018] In summary, this highly reliable pressure cooker pressure limiting and venting structure, utilizing a threaded structure, fundamentally eliminates the risk of the pressure limiting valve accidentally falling off due to spring fatigue or improper operation, greatly improving safety and connection reliability. Simultaneously, the structure relies on the pressure limiting valve's own weight for sealing, and can lift and release pressure when the pressure exceeds the limit, ensuring stable and reliable operation. Furthermore, the threaded connection makes installation and disassembly simple and intuitive, facilitating daily cleaning and maintenance for users, and effectively reducing the risk of operational damage. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is a schematic diagram of Embodiment 1 of the high-reliability pressure cooker pressure limiting and exhaust structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of Example 1;

[0022] Figure 3 This is a schematic diagram of the stainless steel plate in Example 1;

[0023] Figure 4 This is a schematic diagram of the inner valve body in Example 1;

[0024] Figure 5 This is a schematic diagram of Embodiment 2 of the high-reliability pressure cooker pressure limiting and exhaust structure of this utility model;

[0025] Figure 6 This is a cross-sectional view of Example 2;

[0026] Figure 7 This is a schematic diagram of the stainless steel threaded sleeve in Example 2;

[0027] Figure 8 This is a schematic diagram of the exhaust pipe in the high-reliability pressure cooker pressure limiting and exhaust structure of this utility model.

[0028] in:

[0029] 1-Pressure relief valve; 11-Inner valve body; 111-Receiving cavity; 112-Opening; 113-Slot; 114-Protrusion; 115-Step; 12-Outer valve body;

[0030] 2-Exhaust pipe;

[0031] 3-External thread;

[0032] 4-Internal thread;

[0033] 5-Insert; 51-Stainless steel plate; 511-Snap-fit; 512-Ventilation hole; 52-Stainless steel threaded sleeve; 521-Groove;

[0034] 6-Valve tip;

[0035] 7-Pressure relief valve cap. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] In the description of this utility model, it should be understood that the orientation and positional relationship indicated by terms such as "up", "down", "left", "right", "front", "back", "vertical", "bottom", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a highly reliable pressure cooker pressure limiting and venting structure includes a pressure limiting valve 1 and a vent pipe 2. The vent pipe 2 has an external thread 3 only on the outer periphery of the vent end. The minor diameter of the external thread 3 is larger than the size of the non-vent end of the vent pipe 2. The pressure limiting valve 1 includes an inner valve body 11 and an outer valve body 12 coaxially arranged. The outer valve body 12 is fixedly sleeved on the outer periphery of the inner valve body 11. The inner valve body 11 has a receiving cavity 111 inside. The bottom of the inner valve body 11 has an opening 112 communicating with the receiving cavity 111. An insert 5 is fixedly installed at the opening 112. The center of the insert 5 has an internal thread 4 that can mate with the external thread 3. A valve tip 6 is fixedly installed in the receiving cavity 111. The outlet end of the exhaust pipe 2 extends into the receiving cavity 111. Under the weight of the pressure limiting valve 1, the valve tip 6 is pressed against the outlet end of the exhaust pipe 2 to form a seal. The pressure limiting valve 1 can move axially along the exhaust pipe 2 to allow the valve tip 6 to disengage from or press against the outlet end of the exhaust pipe 2, thereby achieving exhaust or sealing. The inlet end of the exhaust pipe 2 is located outside the pressure limiting valve 1. Specifically, the external thread 3 has a limited axial length and its end is interrupted in the axial direction. In this way, when the pressure limiting valve 1 is screwed into the exhaust pipe 2, the internal thread 4 is screwed into and pushed along the external thread 3. When it reaches the end of the external thread 3, as long as the pressure limiting valve 1 is continued to be rotated, the internal thread 4 can slide out and disengage, so that the outlet end of the exhaust pipe 2 can extend into the receiving cavity 111.

[0039] The specific principle of this application is as follows: By setting an external thread 3 at the exhaust pipe 2's outlet end and setting an insert 5 with an internal thread 4 in the inner valve body 11 of the pressure relief valve 1, the exhaust pipe 2's outlet end can be installed into the receiving cavity 111 of the inner valve body 11 through a thread engagement action. First, when the pressure relief valve 1 is installed on the exhaust pipe 2, the external thread 3 and the internal thread 4 are aligned. Then, the pressure relief valve 1 is rotated continuously, and the internal thread 4 inside the pressure relief valve 1 will screw into the external thread 3. Since the non-exhaust end of the exhaust pipe 2 is smaller than the minor diameter of the external thread 3, when the pressure relief valve 1 is rotated to a certain depth, the internal thread 4 will disengage from the external thread 3, allowing the exhaust pipe 2's outlet end to be located within the receiving cavity 111. The pressure relief valve 1 can then move along the axial direction of the exhaust pipe 2. At this point, the pressure relief valve 1 and the exhaust pipe 2 are installed. Due to the weight of the pressure relief valve 1, after installation, the internal thread 4 will move away from the external thread 3. When it is necessary to remove the pressure relief valve 1, the external thread 3 and the internal thread 4 must be aligned and rotated in opposite directions to unscrew the pressure relief valve 1. This structural design makes it impossible for the pressure relief valve 1 to be easily separated from the exhaust pipe 2, ensuring safe use.

[0040] This application's structure abandons the traditional snap-fit ​​connection method, fundamentally avoiding the problem of accidental detachment of the pressure relief valve 1 due to snap-fit ​​fatigue, deformation, or breakage, significantly improving the connection strength and long-term reliability of the pressure relief and exhaust structure. At the same time, the threaded connection method simplifies installation and disassembly, requires less force and angle, facilitates daily cleaning and maintenance, and effectively reduces the risk of structural damage due to improper operation.

[0041] Meanwhile, the pressure relief valve 1 relies on its own weight to press and seal the outlet end of the exhaust pipe 2, achieving a normal seal. When the pressure inside the pot exceeds the set value, the steam pressure overcomes the weight of the pressure relief valve 1, pushing the valve tip 6 to lift the entire pressure relief valve 1. At this time, the valve tip 6 will simultaneously detach from the exhaust port, and the steam will enter the receiving cavity 111 through the exhaust pipe 2 and be discharged from the opening 112, achieving automatic pressure relief. After the pressure decreases, the pressure relief valve 1 automatically falls back to its original position, ensuring reliable sealing and stable operation, thus ensuring the safety and pressure control performance of the pressure cooker during use. In addition, the coaxial arrangement of the inner and outer valve bodies 12 further ensures the stability of the vertical movement of the pressure relief valve 1, avoiding problems such as poor sealing or stuck operation caused by skew.

[0042] To achieve the functions of external thread 3 and internal thread 4, this application provides two embodiments:

[0043] Example 1: Refer to Figures 1 to 4As shown, the insert 5 includes a stainless steel plate 51 with an internal thread 4 at its center. Multiple snap fasteners 511 are spaced circumferentially along the edge of the stainless steel plate 51, and multiple slots 113 are spaced circumferentially along the lower end of the inner valve body 11. The slots 113 correspond one-to-one with the snap fasteners 511 and engage with each other. The use of stainless steel plate 51 in the insert 5 improves durability, and the interlocking of the multiple circumferentially spaced snap fasteners 511 with the slots 113 achieves a large-area mechanical interlock between the insert 5 and the inner valve body 11. This distributed connection effectively distributes the circumferential torque generated during thread engagement and disengagement to the entire inner valve body 11, avoiding stress concentration and greatly enhancing the torsional strength and stability of the insert 5 installation, preventing loosening or detachment of the insert 5 during repeated tightening or disengagement.

[0044] Among them, reference Figure 3 As shown, a vent 512 is provided on the stainless steel plate 51, and the bottom surface of the stainless steel plate 51 is flush with the bottom surface of the inner valve body 11. This vent 512 on the stainless steel plate 51 establishes a direct, unobstructed, and unblockable outlet path for high-pressure steam. After the steam pushes up the pressure relief valve 1, it can be quickly discharged through the vent 512, greatly optimizing the venting efficiency. Furthermore, the flush structure between the bottom surface of the stainless steel plate 51 and the bottom surface of the inner valve body 11 effectively reduces the accumulation of dirt, water stains, or food residue at the interface during use, significantly improving the product's hygiene and ease of cleaning.

[0045] Example 2: Refer to Figures 5 to 7 As shown, the insert 5 includes a stainless steel threaded sleeve 52 with an internal thread 4 at its center. A groove 521 extends circumferentially from the outer wall of the stainless steel threaded sleeve 52, and a protrusion 114 is provided within the receiving cavity 111. The groove 521 and the protrusion 114 are tightly fitted together. The insert 5 (stainless steel threaded sleeve 52) in Embodiment 2 adopts a "groove 521-protrusion 114" tight-fitting method, eliminating the need for additional axial space to arrange the locking mechanism as required by the snap-fit ​​structure 511. The entire fixing structure is fully integrated within the radial wall thickness of the threaded sleeve and the wall thickness of the valve body, resulting in a very compact structure. This facilitates the miniaturization of the pressure relief valve 1 as a whole, or allows for more space to be reserved for other functional components (such as more exhaust channels) within the same external dimensions. Furthermore, the stainless steel threaded sleeve 52 used in Embodiment 2 can be a commercially available product, thus eliminating the need for machining threads on the stainless steel plate 51 as in Embodiment 1. This simplifies the manufacturing process, reduces production costs, and avoids the problems of high processing difficulty and low yield of small metal parts, making it more suitable for mass production.

[0046] Furthermore, the inner valve body 11 is made of plastic. This plastic material allows the metal insert 5 with internal threads 4 to be pre-placed in the mold during injection molding, achieving a secure bond between the insert 5 and the inner valve body 11 through integral injection molding. This process not only creates a tight mechanical anchor between the insert 5 and the plastic substrate, effectively preventing loosening or rotation during use, but also significantly improves product consistency and assembly accuracy. Compared to traditional integrally machined metal inner valve bodies 11, this solution significantly reduces processing difficulty and manufacturing costs while ensuring pressure and temperature resistance, while also achieving a lightweight structure, thus enhancing the user experience.

[0047] Furthermore, the size of the receiving cavity 111 is larger than the size of the exhaust pipe 2 outlet end. This provides ample guiding space and assembly tolerance for the exhaust pipe 2 outlet end to smoothly extend into the receiving cavity 111 during installation. Simultaneously, during the operation of the pressure relief valve 1, this gap structure allows the exhaust pipe 2 outlet end to maintain a certain degree of axial freedom of movement within the receiving cavity 111, which helps to automatically align the sealing surface between the valve tip 6 and the outlet end, compensating for minor misalignments caused by machining errors or thermal deformation, thereby improving sealing reliability. In addition, this gap can also serve as part of an auxiliary exhaust channel, guiding the uniform diffusion of steam during high-pressure exhaust, reducing localized erosion, and extending the service life of components.

[0048] Furthermore, refer to Figure 1 and Figure 5 As shown, it also includes a pressure-limiting valve cap 7, which is sleeved and fixed to the upper end of the inner valve body 11. The lower end of the inner valve body 11 extends radially outward to form a step 115. The outer valve body 12 is sleeved on the outer periphery of the inner valve body 11, with its lower end resting on the step 115. The pressure-limiting valve cap 7 presses against the upper end of the outer valve body 12 from above, axially fixing the outer valve body 12 between the step 115 and the pressure-limiting valve cap 7. This forms a complete pressure-limiting valve 1 structure, enhancing the overall compactness and sealing performance, and making it easier for users to handle and operate.

[0049] In summary, this highly reliable pressure cooker pressure limiting and venting structure, utilizing a threaded structure, fundamentally eliminates the risk of the pressure limiting valve 1 accidentally falling off due to spring fatigue or improper operation, greatly improving safety and connection reliability. At the same time, this structure relies on the weight of the pressure limiting valve 1 to achieve sealing, and can lift and release pressure when the pressure exceeds the limit, with stable and reliable operation. Furthermore, the threaded connection method makes installation and disassembly simple and intuitive, facilitating daily cleaning and maintenance by users, and effectively reducing the risk of operational damage.

[0050] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A highly reliable pressure-limiting and venting structure for a pressure cooker, comprising a pressure-limiting valve and a venting pipe, characterized in that, The exhaust pipe has an external thread only on the outer periphery of the outlet end. The minor diameter of the external thread is larger than the size of the non-outlet end of the exhaust pipe. The pressure limiting valve includes an inner valve body and an outer valve body arranged coaxially. The outer valve body is fixedly sleeved on the outer periphery of the inner valve body. The inner valve body has a receiving cavity inside. The bottom of the inner valve body has an opening communicating with the receiving cavity. An insert is fixedly installed at the opening. The center of the insert has an internal thread that can cooperate with the external thread. A valve tip is fixedly installed in the receiving cavity. The outlet end of the exhaust pipe extends into the receiving cavity. The valve tip is pressed against the outlet end of the exhaust pipe under the weight of the pressure limiting valve to form a seal. The pressure limiting valve can move axially along the exhaust pipe to disengage or press against the outlet end of the exhaust pipe to achieve exhaust or sealing. The inlet end of the exhaust pipe is located outside the pressure limiting valve.

2. The high-reliability pressure-limiting and venting structure for a pressure cooker according to claim 1, characterized in that, The insert includes a stainless steel plate with the internal thread in the center, and multiple buckles are arranged circumferentially around the edge of the stainless steel plate. Multiple slots are arranged circumferentially around the lower end of the inner valve body, and the slots and buckles correspond one-to-one and engage with each other.

3. The high-reliability pressure-limiting and venting structure for a pressure cooker according to claim 2, characterized in that, The stainless steel plate is provided with an exhaust hole, and the bottom surface of the stainless steel plate is flush with the bottom surface of the inner valve body.

4. The high-reliability pressure-limiting and venting structure for a pressure cooker according to claim 1, characterized in that, The insert includes a stainless steel threaded sleeve with the internal thread at its center. The outer wall of the stainless steel threaded sleeve is provided with a groove extending circumferentially. A protrusion is provided in the receiving cavity. The groove and the protrusion are tightly fitted together.

5. The high-reliability pressure-limiting and venting structure for a pressure cooker according to claim 3 or 4, characterized in that, The inner valve body is made of plastic.

6. The high-reliability pressure-limiting and venting structure for a pressure cooker according to claim 3 or 4, characterized in that, The size of the receiving cavity is larger than the size of the exhaust pipe outlet end.

7. The high-reliability pressure-limiting and venting structure for a pressure cooker according to claim 1, characterized in that, It also includes a pressure limiting valve cap, which is sleeved and fixed to the upper end of the inner valve body. The lower end of the inner valve body extends radially outward to form a step. The outer valve body is sleeved on the outer periphery of the inner valve body, and its lower end rests on the step. The pressure limiting valve cap presses the upper end of the outer valve body from above, axially fixing the outer valve body between the step and the pressure limiting valve cap.

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