Pressure limiting valve of pressure cooking utensil and pressure cooking utensil

Abstract

The pressure limiting valve comprises a valve element and a valve body surrounding the periphery of the valve element, the valve element comprises a sealing section and an extending section located above the sealing section, the lower end of the sealing section is provided with a sealing transition face used for abutting against an exhaust pipe in a sealing mode, the pressure limiting valve further comprises a valve element support, and the valve element support is arranged on the valve body. The valve element support is arranged on the periphery of the extending section in a sleeving mode to form a valve element assembly together with the valve element, the whole valve element assembly is fixed to the valve body, and the hardness of the valve element support is larger than that of the valve element. The valve element support is arranged on the outer side of the valve element, in the machining process, a clamp of a mold clamps the valve element support from the outer side and does not make direct contact with the valve element, and the hardness of the valve element support is larger than that of the valve element, so that the valve element support can play a role in protecting the valve element, it is guaranteed that the valve element is always kept in a vertical state in the injection molding process; therefore, the product yield is improved.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen appliance technology, specifically relating to a pressure limiting valve for a pressure cooking appliance and the pressure cooking appliance itself. Background Technology

[0002] The pressure relief valve is an important component of pressure cooking appliances. Located at the top of the exhaust pipe and possessing considerable weight, it blocks the exhaust pipe under its own weight. When the pressure inside the pot exceeds the set value, the upward thrust of the airflow overcomes the valve's weight, lifting it up and opening the exhaust pipe for pressure release. After pressure cooking is complete, the pressure relief valve can also be raised via a solenoid valve or manual control by the user to open the exhaust pipe and release pressure, allowing the user to open the lid.

[0003] The existing pressure relief valve includes a shell, a copper cap, a silicone valve core, an iron valve body, and a valve disc. The silicone valve core is used to seal against the exhaust pipe. During assembly, the copper cap is first inserted into the silicone valve core, and then the copper cap is installed on the valve disc to fix the silicone valve core. Finally, the valve core and valve body are fixed by injection molding or other methods, thus fixing all components into a whole.

[0004] Because the silicone valve core is relatively soft and difficult to fix, it must first be assembled onto a copper cap, with the silicone valve core wrapping around the outside of the copper cap. Then, the copper cap is used to fix it to the valve disc. This makes the assembly process of the valve core and valve body cumbersome, time-consuming, inefficient, and costly. Furthermore, since the silicone valve core is on the outside of the copper cap, it is easily deformed by external pressure during both clamping in the mold and subsequent processing and assembly. This can lead to misalignment of the silicone valve core during assembly with the valve body, meaning that after molding, the silicone valve core is not centered with the valve body. This directly affects the sealing effect of the silicone valve core on the exhaust pipe, resulting in a low yield rate for the pressure relief valve. Utility Model Content

[0005] This utility model provides a pressure limiting valve for a pressure cooking appliance and a pressure cooking appliance, in order to solve the problems of complex assembly steps of valve core and valve body, low production efficiency, and the valve core material being soft and prone to deformation during assembly, causing it to tilt relative to the valve body, resulting in a low yield of pressure limiting valves.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A pressure limiting valve for a pressure cooking appliance includes a valve core and a valve body surrounding the outer periphery of the valve core. The valve core includes a sealing section and an extension section located above the sealing section. The lower end of the sealing section has a sealing transition surface for sealing against an exhaust pipe. The pressure limiting valve also includes a valve core support, which is sleeved on the outer periphery of the extension section to form a valve core assembly together with the valve core. The valve core assembly is fixed to the valve body as a whole, and the hardness of the valve core support is greater than that of the valve core.

[0008] In this invention, the valve core support is fitted onto the outer periphery of the extension section, which is more susceptible to compression during valve core assembly. The valve core assembly, formed by the valve core support and the valve core, is then assembled and fixed to the valve body. Compared to existing technologies, this not only reduces the number of assembly steps for the valve core and valve body, improving production efficiency, but also ensures that the valve core support, located on the outer side of the valve core and possessing greater rigidity, protects the valve core during processing. The mold's clamps hold the valve core support from the outside, avoiding direct contact with the valve core, thus protecting it. This ensures the stability of the clamping mechanism while preventing direct clamping force on the valve core, which could cause deformation. Consequently, during the subsequent assembly and fixing of the valve core assembly and valve body, the force exerted by the clamps and plastic is transferred from the valve core to the valve core support, ensuring the valve core remains vertical and centered with the valve body throughout the assembly process. This significantly reduces the probability of valve core tilting and improves product yield.

[0009] The valve core support and the valve core are separate structures. One of the valve core support and the valve core has a positioning protrusion on its side wall, and the other has a positioning groove that mates with the positioning protrusion.

[0010] In this design, the valve core support and valve core are separate components, allowing them to be manufactured individually using different materials. This ensures the valve core support has a higher hardness than the valve core, reducing manufacturing complexity. During assembly, the positioning protrusions and grooves easily and conveniently secure the two components together, facilitating subsequent assembly and processing. Furthermore, the positioning protrusions and grooves also restrict relative movement between the valve core and valve core support, maintaining their fixed positions. This ensures the valve core's positional stability during clamping and assembly, further reducing the possibility of tilting.

[0011] The positioning groove extends axially along the valve core to the end of the valve core or valve core support to form an opening for the positioning protrusion to pass through.

[0012] In this design, the positioning groove extends to the end of the valve core or valve core support to form an opening, allowing the valve core and valve core support to be assembled by insertion. During insertion, the positioning protrusion enters the positioning groove from the opening, thereby engaging with the positioning groove. This makes the installation of the valve core and valve core support simpler and more convenient, and prevents strong compression of the valve core during installation, allowing the valve core to maintain its initial shape and avoiding tilting of the valve core under compression.

[0013] The valve body includes a main body and a housing covering the outside of the main body. The valve core assembly and the housing are integrally molded by injection molding.

[0014] In this design, the valve core and valve core bracket are first simply installed, and then injection molded together with the valve body. After molding, the valve core, valve core bracket, and valve body are integrally fixed, simplifying the overall assembly steps of the pressure relief valve, reducing assembly difficulty, and greatly improving production efficiency and product yield. At the same time, the outer shell covering the outside of the body can serve as an aesthetic decoration for the valve body, improving the overall appearance of the pressure relief valve.

[0015] The valve core has a filling cavity inside, and the top surface of the extension section has an injection port that connects to the filling cavity.

[0016] In this design, the valve core is hollow. During injection molding, the plastic flows into the filling cavity, forming a rigid structure inside the valve core. This not only secures the valve core to the valve body but also increases the valve core's strength. The valve core has a soft surface and a rigid interior. The soft surface allows for a tighter contact with the exhaust pipe, improving the sealing effect. The rigid interior restricts the valve core's deformation, preventing significant deformation and ensuring its positional stability and effective sealing of the exhaust pipe.

[0017] The valve body has an internal installation channel, the valve core assembly is located in the installation channel, and a reinforcing rib is provided between the valve core and the outer shell. There are multiple reinforcing ribs, which are evenly spaced along the circumference of the valve core, and an exhaust port is formed between two adjacent reinforcing ribs.

[0018] In this design, the reinforcing rib structure corresponds to the groove structure in the mold during molding, thereby forming a flow channel connecting the valve core and the body for plastic to flow and fill. During the injection molding process, only one part of the valve core or the body needs to be injected with plastic. After the plastic is filled, it can flow to another part through the groove structure, thereby completing the overall injection molding and making the injection operation simpler.

[0019] The sealing transition surface is a sealing bevel to form a sealing tip at the lower end of the sealing section, which is inserted into the exhaust pipe to seal the exhaust pipe; or, the sealing transition surface is a sealing arc surface, which abuts against the top of the exhaust pipe to seal the exhaust pipe.

[0020] In this design, the sealing section has a sealing tip, allowing at least a portion of the sealing tip to be inserted into the exhaust passage of the exhaust pipe, thereby forming a tighter contact with the exhaust pipe and achieving a better seal. Alternatively, the sealing arc surface contacts the end of the exhaust pipe, similarly allowing at least a portion of the sealing arc surface to deform and be inserted into the exhaust passage of the exhaust pipe, ensuring a seal.

[0021] The valve body includes a main body and a housing covering the outside of the main body. The main body forms an installation channel for installing the valve core. The housing includes a first housing located on the outer wall of the main body and a second housing located on the inner wall of the installation channel. The top of the housing abuts against the valve core support to support the valve core support.

[0022] In this design, the first outer shell is located on the outside of the main body, forming the exterior surface of the pressure relief valve, which improves the appearance quality and prevents scratches. The second outer shell is located on the inner wall of the installation channel, which not only prevents the high-temperature steam from the exhaust pipe from directly contacting the main body and causing rust, but also provides upward support for the valve core bracket, thereby improving the stability of the valve core bracket and reducing the risk of the valve core bracket falling off the valve core.

[0023] The upper edge of the extension section is not higher than the upper edge of the valve core support.

[0024] In this design, the upper edge of the extension section is not higher than the upper edge of the valve core bracket. On the one hand, this makes it less likely for the valve core to become misaligned when assembling the valve core assembly and valve body. On the other hand, it increases the contact area between the plastic and the valve core bracket during injection molding, thereby improving the fixing stability and strength of the valve core bracket after curing.

[0025] This utility model also discloses a pressure cooking appliance, including a pot body and a pot lid that fits onto the pot body, and also includes a pressure limiting valve of the pressure cooking appliance. The pot lid is provided with an exhaust pipe, and the pressure limiting valve is located at the top of the exhaust pipe so that the sealing section closes the exhaust pipe, and the pressure limiting valve can move upward to open the exhaust pipe. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is an exploded view of the pressure relief valve according to one embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of a pressure-limiting valve according to one embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the valve core assembly according to one embodiment of the present invention;

[0030] Figure 4 for Figure 3 Schematic diagram of the middle valve core;

[0031] Figure 5 for Figure 3 Schematic diagram of the structure of the valve core support;

[0032] Figure 6 This is a cross-sectional view of the pressure relief valve according to another embodiment of the present invention.

[0033] in:

[0034] 1 Valve core; 11 Extension section; 12 Sealing section; 121 Sealing transition surface; 13 Injection port; 14 Positioning protrusion; 15 Filling cavity;

[0035] 2 Valve body; 21 Body; 22 Housing; 221 First housing; 222 Second housing; 23 Mounting groove; 24 Reinforcing rib; 25 Mounting channel;

[0036] 3 Valve core support; 31 Positioning groove. Detailed Implementation

[0037] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] like Figure 1 , Figure 2 , Figure 3 As shown, a pressure limiting valve for a pressure cooking appliance includes a valve core 1 and a valve body 2 surrounding the outer periphery of the valve core 1. The valve core 1 includes a sealing section 12 and an extension section 11 located above the sealing section 12. The lower end of the sealing section 12 has a sealing transition surface 121 for sealing with an exhaust pipe. The pressure limiting valve also includes a valve core support 3, which is sleeved on the outer periphery of the extension section 11 to form a valve core assembly together with the valve core 1. The valve core assembly is fixed to the valve body 2 as a whole. The hardness of the valve core support 3 is greater than that of the valve core 1.

[0043] Preferably, the valve core 1 is made of silicone material, which has good elastic deformation capability. When it comes into contact with the exhaust pipe, it can undergo elastic deformation to improve the contact effect and sealing performance. The valve core support 3 is preferably made of plastic material. Of course, the valve core support 3 can also be made of other materials, such as metal, or another flexible material, as long as its hardness is greater than that of the valve core 1. The hardness of the valve core support 3 can be increased by using the same material and increasing the thickness, or by using a material with higher hardness, or other methods, which are not limited here.

[0044] It should be noted that, taking in-mold injection molding as an example, during injection molding, a fixture is needed to clamp and fix the valve core 1 at the center of the valve body 2, and then molten plastic is injected to form the valve core 1 and the valve body 2 into one piece. The fixture clamps the extension section 11 of the valve core 1, so the extension section 11 is more prone to deformation, which in turn causes the sealing part to deviate.

[0045] In this utility model, the valve core bracket 3 can completely cover the outer periphery of the extension section 11, or it can cover a portion of the outer periphery of the extension section 11, and the valve core bracket 3 covers at least the top of the extension section 11.

[0046] In this invention, the valve core support 3 is sleeved on the outer periphery of the extension section 11, which is easily compressed during the assembly of the valve core 1. Then, the valve core assembly formed by the valve core support 3 and the valve core 1 is assembled and fixed to the valve body 2. Compared with the prior art, this not only reduces the assembly steps of the valve core 1 and the valve body 2, but also improves production efficiency. Moreover, since the valve core support 3 is located on the outside of the valve core 1 and has a higher hardness, during processing, the mold clamps the valve core support 3 from the outside without directly contacting the valve core 1. Furthermore, the hardness of the valve core support 3 is greater than that of the valve core 1, thus enabling the valve core support 3 to protect the valve core 1. This ensures the stability of the clamping of the valve core support 3 by the clamp and avoids the clamping force from directly acting on the valve core 1, which could cause deformation of the valve core 1. In subsequent processing and assembly, the force of the fixture and plastic is transferred from the valve core 1 to the valve core support 3, ensuring that the valve core 1 remains vertical during assembly, that is, centered with the valve body 2. This greatly reduces the probability of the valve core 1 tilting and improves the product yield.

[0047] As a preferred embodiment of this utility model, such as Figures 3 to 5 As shown, the valve core support 3 and the valve core 1 are separate structures. One of the valve core support 3 and the valve core 1 has a positioning protrusion 14 on its side wall, and the other has a positioning groove 31 that cooperates with the positioning protrusion 14.

[0048] The valve core support 3 and valve core 1 are separate components, allowing them to be manufactured separately using different materials. This ensures that the hardness of the valve core support 3 is greater than that of the valve core 1, reducing manufacturing difficulty. During assembly, the positioning protrusion 14 and positioning groove 31 easily and conveniently fix the two together, facilitating subsequent processing and assembly. Simultaneously, the positioning protrusion 14 and positioning groove 31 also restrict the relative movement between the valve core 1 and valve core support 3, maintaining their fixed positions. This ensures the positional stability of the valve core 1 during clamping and assembly, further reducing the possibility of tilting.

[0049] The positioning protrusion 14 and positioning groove 31 can be used to easily fix the valve core 1 and valve core bracket 3, restricting their relative position, and then complete fixation can be achieved through subsequent assembly.

[0050] Of course, in other embodiments, the valve core 1 and the valve core support 3 can also be designed as an integral structure, which is not limited here.

[0051] This embodiment does not limit the structure of the positioning groove 31. In a preferred embodiment, such as... Figures 3 to 5 As shown, the positioning groove 31 extends along the axial direction of the valve core 1 to the end of the valve core 1 or the valve core support 3 to form an opening through which the positioning protrusion 14 passes.

[0052] The positioning groove 31 extends to the end of the valve core 1 or valve core support 3 to form an opening, so that the valve core 1 and valve core support 3 can be assembled by plugging. During the plugging process, the positioning protrusion 14 enters the positioning groove 31 from the opening, thereby cooperating with the positioning groove 31, making the installation of the valve core 1 and valve core support 3 simpler and more convenient, and the valve core 1 will not be strongly squeezed during the installation process, so that the valve core 1 can maintain its initial shape and avoid the valve core 1 from tilting under the squeezed state.

[0053] In another embodiment, the positioning groove 31 can be completely enclosed. During assembly, since the valve core 1 is made of a flexible material, it can undergo elastic deformation. By squeezing, the valve core 1 is inserted into the valve core support 3, so that the positioning rib and the positioning groove 31 are connected, which can restrict the relative movement of the valve core 1 and the valve core support 3 in all directions.

[0054] Specifically, such as Figure 4 , Figure 5 As shown, the positioning protrusion 14 is disposed on the valve core 1 and protrudes outward along the radial direction of the valve core 1, and the positioning groove 31 is disposed on the side wall of the valve core support 3. Of course, the positioning protrusion 14 can also be disposed on the valve core support 3, and correspondingly, the positioning groove 31 can be disposed on the side wall of the valve core 1. This is not limited here.

[0055] Furthermore, such as Figure 3 , Figure 4 , Figure 5 As shown, the positioning protrusion 14 is located on the top of the valve core 1, and the positioning groove 31 is also located on the top of the valve core support 3, so that the valve core 1 extends downward from above the valve core support 3 into the interior of the valve core support 3, and the positioning protrusion 14 and the positioning groove 31 are engaged.

[0056] Preferably, such as Figure 4 , Figure 5As shown, there are two positioning protrusions 14, which are arranged radially opposite to each other on both sides of the valve core 1. The positioning grooves 31 are arranged one-to-one with the positioning protrusions 14. Of course, the number of positioning protrusions 14 and positioning grooves 31 can also be other, which is not limited here.

[0057] As a preferred embodiment of this utility model, such as Figure 2 , Figure 3 As shown, the valve core 1 and the valve core support 3 are fixed to form a valve core assembly. The valve body 2 includes a body 21 and a shell 22 covering the outside of the body 21. The valve core assembly and the shell 22 are integrally formed by injection molding.

[0058] When assembling the pressure relief valve, the valve core 1 and valve core bracket 3 are first simply installed, and then injection molded together with the valve body 2. After molding, the valve core 1, valve core bracket 3, and valve body 2 are integrally fixed, simplifying the overall assembly steps of the pressure relief valve, reducing assembly difficulty, and greatly improving production efficiency and product yield. At the same time, the outer shell 22, which wraps around the outside of the body 21, can serve as an aesthetic decoration for the valve body 2, improving the overall appearance of the pressure relief valve.

[0059] Preferably, such as Figure 3 , Figure 4 , Figure 6 As shown, the valve core 1 has a filling cavity 15 inside, and the top surface of the extension section 11 has an injection port 13 that communicates with the filling cavity 15.

[0060] The valve core 1 is hollow inside. During the injection molding process, the plastic also flows into the filling cavity 15, forming a rigid structure inside the valve core 1. This not only secures the valve core 1 and the valve body 2 but also increases the strength of the valve core 1. The valve core 1 has a soft surface and a hard interior. The soft surface allows for a tighter contact with the exhaust pipe, thus improving the sealing effect. The hard interior restricts the deformation of the valve core 1, preventing it from undergoing significant deformation, thereby ensuring the positional stability of the valve core 1 and its sealing effect on the exhaust pipe.

[0061] Preferably, the filling cavity 15 is located within the extension section 11, while the sealing section 12 does not have a filling cavity 15. Since the sealing section 12 needs to be sealed against the exhaust pipe, it requires better elastic deformation capability. Therefore, the injection of plastic can prevent the sealing section 12 from becoming harder, thus reducing the sealing effect. Of course, both the extension section 11 and the sealing section 12 can also have filling cavities 15.

[0062] In one embodiment, during injection molding, plastic can be injected into the injection port 13 of the valve core 1 and the valve body 2 respectively, so that the injection positions are more dispersed, the two injections are more uniform, and the injection time is shortened.

[0063] In another embodiment, during injection molding, the valve core 1 and the valve body 2 are connected so that the plastic can flow in both places. This allows for single-position injection molding. For example, the plastic is first injected into the injection port 13 of the valve core 1. After the plastic fills the filling cavity 15, it flows to the valve body 2 to form the outer shell 22 on the valve body 2.

[0064] Specifically, such as Figure 1 , Figure 2 As shown, the valve body 2 has an installation channel 25 inside, the valve core assembly is located in the installation channel 25, and a reinforcing rib 24 is provided between the valve core 1 and the outer shell 22. There are multiple reinforcing ribs 24 and they are evenly spaced along the circumference of the valve core 1. An exhaust port is formed between two adjacent reinforcing ribs 24.

[0065] When the pressure relief valve moves upward to open the exhaust pipe, the gas inside the exhaust pipe flows upward in the installation channel 25 and is discharged through the exhaust port at the top of the valve body 2.

[0066] During molding, the reinforcing rib 24 corresponds to the groove structure in the mold, thereby forming a flow channel connecting the valve core 1 and the body 21 for plastic to flow and fill. During the injection molding process, only one part of the valve core 1 or the body 21 needs to be injected. After the plastic is filled, it can flow to another part through the groove structure, thereby completing the overall injection molding and making the injection operation simpler.

[0067] In addition, after molding, the reinforcing rib 24 can also limit the valve core 1, keeping it centered with the valve body 2 and preventing it from tilting.

[0068] like Figure 1 As shown, the gap between the two reinforcing ribs 24 forms an exhaust port for the gas ejected from the exhaust pipe to be discharged. Specifically, the reinforcing rib 24 has a cross-shaped structure. Of course, the reinforcing rib 24 can also be arranged in other ways, which are not limited here.

[0069] It should be noted that this utility model does not limit the specific structure of the sealing transition surface 121. In one embodiment, such as... Figure 3 As shown, the sealing transition surface 121 is a sealing slope to form a sealing tip at the lower end of the sealing section 12. The sealing tip is inserted into the exhaust pipe to seal the exhaust pipe.

[0070] The sealing section 12 has a sealing tip, such that at least a portion of the sealing tip can be inserted into the exhaust passage of the exhaust pipe, thereby forming a tighter contact with the exhaust pipe and providing a better seal for the exhaust pipe.

[0071] In another embodiment, the sealing transition surface 121 is a sealing arc surface, which abuts against the top of the exhaust pipe to seal the exhaust pipe.

[0072] By contacting the end of the exhaust pipe with the sealing arc surface, at least a portion of the sealing arc surface can deform and be inserted into the exhaust passage of the exhaust pipe, ensuring a sealing effect. Preferably, the sealing transition surface 121 is a spherical surface.

[0073] Specifically, the exhaust pipe has an outlet at the top, and the edge of the outlet has a contact slope so that the sealing transition surface 121 can contact the contact slope to improve the sealing effect.

[0074] Preferably, such as Figure 6 As shown, the valve body 2 includes a body 21 and a shell 22 covering the outside of the body 21. The body 21 forms an installation channel 25 for installing the valve core 1. The shell 22 includes a first shell 221 located on the outer wall of the body 21 and a second shell 222 located on the inner wall of the installation channel 25. The top of the shell abuts against the valve core support 3 to support the valve core support 3.

[0075] The first outer shell 22 is located on the outside of the main body 21, forming the outer surface of the pressure relief valve, which can improve the appearance quality and prevent scratches. The second outer shell 22 is located on the inner wall of the mounting channel 25. It can not only prevent the high-temperature steam ejected from the exhaust pipe from directly contacting the main body 21 and causing the main body 21 to rust, but also provide upward support for the valve core support 3, thereby improving the stability of the valve core support 3 and reducing the risk of the valve core support 3 falling off the valve core 1.

[0076] Specifically, such as Figure 2 , Figure 6 As shown, the valve body 2 is also provided with a mounting groove 23 for mounting a snap ring on the side facing the mounting channel 25, and the mounting groove 23 is located below the valve core 1.

[0077] Preferably, such as Figure 3 , Figure 6 As shown, the upper edge of the extension section 11 is not higher than the upper edge of the valve core bracket 3.

[0078] The upper edge of the extension section 11 is not higher than the upper edge of the valve core bracket 3. On the one hand, the valve core 1 is less likely to deviate during assembly and fixing. On the other hand, during injection molding, it can increase the contact area between the plastic and the valve core bracket 3, thereby improving the fixing stability and strength of the valve core bracket 3 after curing.

[0079] Specifically, such as Figure 3 As shown, the upper edge of the valve core bracket 3 can be flush with the upper edge of the extension section 11, or it can be as follows: Figure 6 As shown, the upper edge of the valve core support 3 is higher than the upper edge of the extension section 11.

[0080] This utility model also discloses a pressure cooking appliance, including a pot body and a pot lid that fits onto the pot body, and also includes a pressure limiting valve of the pressure cooking appliance. The pot lid is provided with an exhaust pipe, and the pressure limiting valve is placed at the top of the exhaust pipe so that the sealing section 12 closes the exhaust pipe, and the pressure limiting valve can move upward to open the exhaust pipe.

[0081] This invention does not limit the opening method of the pressure relief valve. In one embodiment, the pressure relief valve can be pushed upwards by the gas pressure inside the pot, thereby disengaging from the exhaust pipe to allow for exhaust. Specifically, the weight of the pressure relief valve is adjusted according to the set maximum gas pressure value inside the pot. When the gas pressure inside the pot is higher than the maximum gas pressure value, the pressure relief valve is pushed up.

[0082] In another embodiment, the lid is equipped with a solenoid valve, which is controlled by the program of the pressure cooking appliance so that it can automatically control the solenoid valve to work after the pressure cooking is completed, so that the solenoid valve lifts the pressure relief valve to release pressure.

[0083] In another embodiment, the pot lid is provided with a vent button, which can drive the pressure relief valve to move upward to release pressure. After the pressure cooking is completed, the user can manually control the vent button to move the pressure relief valve upward to release pressure.

[0084] The above embodiments can be implemented individually or in combination. For example, a pressure cooking appliance can be equipped with both a solenoid valve and a venting button to provide both automatic and manual venting and pressure relief methods, allowing users to flexibly choose the pressure relief method.

[0085] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0086] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0087] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A pressure limiting valve for a pressure cooking appliance, comprising a valve core and a valve body surrounding the outer periphery of the valve core, characterized in that, The valve core includes a sealing section and an extension section located above the sealing section. The lower end of the sealing section has a sealing transition surface for sealing against the exhaust pipe. The pressure relief valve also includes a valve core support. The valve core support is sleeved on the outer periphery of the extension section to form a valve core assembly together with the valve core. The valve core assembly is fixed to the valve body as a whole. The hardness of the valve core support is greater than that of the valve core.

2. The pressure limiting valve of the pressure cooking appliance according to claim 1, characterized in that, The valve core support and the valve core are separate structures. One of the valve core support and the valve core has a positioning protrusion on its side wall, and the other has a positioning groove that cooperates with the positioning protrusion.

3. The pressure limiting valve of the pressure cooking appliance according to claim 2, characterized in that, The positioning groove extends axially along the valve core to the end of the valve core or the valve core support to form an opening through which the positioning protrusion passes.

4. The pressure limiting valve of the pressure cooking appliance according to claim 1, characterized in that, The valve body includes a main body and a shell covering the outside of the main body, and the valve core assembly and the shell are integrally formed by injection molding.

5. The pressure limiting valve of the pressure cooking appliance according to claim 4, characterized in that, The valve core has a filling cavity inside, and the top surface of the extension section has an injection port that communicates with the filling cavity.

6. The pressure limiting valve of the pressure cooking appliance according to claim 4, characterized in that, The valve body has an internal mounting channel, the valve core assembly is located in the mounting channel, and a reinforcing rib is provided between the valve core and the outer shell. There are multiple reinforcing ribs, which are evenly spaced along the circumference of the valve core, and an exhaust port is formed between two adjacent reinforcing ribs.

7. The pressure limiting valve of the pressure cooking appliance according to claim 1, characterized in that, The sealing transition surface is a sealing bevel to form a sealing tip at the lower end of the sealing section, the sealing tip being inserted into the exhaust pipe to seal the exhaust pipe; or, The sealing transition surface is a sealing arc surface, which abuts against the top of the exhaust pipe to seal the exhaust pipe.

8. The pressure limiting valve of the pressure cooking appliance according to claim 1, characterized in that, The valve body includes a main body and a shell covering the outside of the main body. The main body forms an installation channel for installing the valve core. The shell includes a first shell located on the outer wall of the main body and a second shell located on the inner wall of the installation channel. The top of the shell abuts against the valve core support to support the valve core support.

9. The pressure limiting valve of the pressure cooking appliance according to claim 1, characterized in that, The upper edge of the extension section is not higher than the upper edge of the valve core support.

10. A pressure cooking appliance, comprising a pot body and a lid that fits onto the pot body, characterized in that, It also includes a pressure limiting valve for the pressure cooking appliance according to any one of claims 1-9, wherein the pot lid is provided with a vent pipe, the pressure limiting valve is placed at the top of the vent pipe to close the vent pipe with the sealing section, and the pressure limiting valve is capable of moving upward to open the vent pipe.

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