Pressure cooking utensil

Abstract

The utility model discloses a pressure cooking utensil which comprises a heat preservation cover and a heating disc arranged in the heat preservation cover, a pressure bearing piece is arranged between the bottom wall of the heating disc and the heat preservation cover, the side wall of the heat preservation cover is provided with a supporting step protruding towards the interior of the heat preservation cover, and the pressure bearing piece comprises a deformation part and a supporting part surrounding the peripheral side of the deformation part. The supporting part abuts against the supporting step, and a deformation space is formed between the deformation part and the heat preservation cover. An opening is formed in the central area of the heating disc, a wire passing opening is formed in the center of the deformation part, the diameter of the opening is larger than that of the wire passing opening, the temperature measuring piece penetrates through the opening to make contact with the inner container, the upper end of the elastic piece acts on the temperature measuring piece, and the lower end of the elastic piece abuts against the deformation part; the distance between the abutting positions of the two ends of the elastic piece is shortened in the initial state, the compression amount of the spring with the same number of turns is increased, and reliable floating of the temperature measuring piece is guaranteed. And the pressure-bearing piece can be deformed by a larger margin, so that the requirement of high-pressure cooking is met.

Description

Technical Field

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

[0002] Temperature sensing devices are an essential component of pressure cooking appliances. Taking a pressure cooker as an example, its interior typically includes a heat-insulating cover, a heating plate inside the cover, and an inner pot placed on top of the heating plate. The temperature sensing element floats through the heating plate to maintain contact with the bottom wall of the inner pot, thus detecting temperature changes inside the inner pot. Simultaneously, a deformable manganese sheet is positioned between the heating plate and the bottom wall of the heat-insulating cover. When the internal pressure of the inner pot increases, it exerts a downward force on the heating plate, causing it to move downwards. The manganese sheet elastically deforms under the downward pressure of the heating plate, and when the internal pressure decreases, the elastic force pushes the heating plate back up to its original position.

[0003] In existing technologies, a spring is typically placed between the temperature sensing element and the insulation cover to allow the temperature sensing element to float up and down under the action of the spring, maintaining its contact with the inner liner. The upper end of the spring acts on the temperature sensing element, and the lower end acts on the bottom wall of the insulation cover. However, the vertical distance between the inner liner and the insulation cover is relatively large. To ensure a tight fit between the temperature sensing element and the bottom wall of the inner liner, the spring often needs to be longer, or the material needs to be of higher quality, requiring higher elasticity. Therefore, it is necessary to increase the number of spring coils, which undoubtedly increases costs. Moreover, when the temperature sensing element is pressed down, compressing the spring, the amount of compression is small, resulting in insufficient elasticity or the direction of the applied elasticity is prone to deviation, which may cause the temperature sensing element to become eccentric, affecting the accuracy of temperature measurement.

[0004] Chinese patent CN201822609U discloses an improved manganese sheet support for an electric pressure cooker. This design reduces the spring length by placing the lower end of a spring acting on the temperature sensor against the manganese sheet. However, the bottom wall of the insulation cover has an upward-protruding boss at its center. After the manganese sheet is installed, both the boss on the outer periphery and the central boss at the bottom of the insulation cover support the manganese sheet, causing the center and edges of the sheet to be subjected to upward support. This severely affects the deformation of the manganese sheet, and the maximum deformation of the manganese sheet directly affects the maximum cooking pressure of the pressure cooker. Consequently, it becomes difficult to increase the cooking pressure of conventional pressure cookers, often limiting them to cooking at only 70 kPa, thus hindering further improvements in the cooking efficiency of pressure cookers. Utility Model Content

[0005] This utility model provides a pressure cooking appliance to solve the problems of large vertical distance between the inner pot and the heat preservation cover, which requires high length and material of the spring, resulting in increased cost, inaccurate temperature detection due to the inability of the temperature measuring element to maintain vertical floating, and the limitation of the maximum deformation of the manganese sheet, making it difficult to meet the needs of high-pressure cooking.

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

[0007] A pressure cooking appliance includes a heat preservation cover and a heating plate placed inside the heat preservation cover. A pressure-bearing member is provided between the bottom wall of the heating plate and the heat preservation cover. The side wall of the heat preservation cover is provided with a support step protruding towards the inside of the heat preservation cover. The pressure-bearing member includes a deformable part and a support part surrounding the outer periphery of the deformable part. The support part rests against the support step. A deformable space is provided between the deformable part and the bottom wall of the heat preservation cover. An opening is provided in the central area of ​​the heating plate. A wire passage is provided in the center of the deformable part. The diameter of the opening is larger than the diameter of the wire passage. The pressure cooking appliance also includes a temperature measuring element and an elastic element. The temperature measuring element passes through the opening to contact the inner pot. The upper end of the elastic element acts on the temperature measuring element, and the lower end abuts against the deformable part.

[0008] In this invention, a support step is provided on the side wall of the heat insulation cover. The support portion of the outer edge of the pressure-bearing component rests on the support step, shifting the support position of the heat insulation cover on the pressure-bearing component from the original bottom support to the side support. This avoids the impact of deformation of the bottom of the heat insulation cover on the accuracy of pressure detection. Since the bottom wall of the heat insulation cover is a large flat structure with relatively weak structural strength, the support step on the side wall supports the pressure-bearing component, transferring the stress position of the heat insulation cover from the bottom wall to the side wall, thus ensuring the structural stability of the bottom wall, maintaining a fixed distance between the pressure switch and the heating plate, and achieving precise pressure control. Furthermore, the support step increases the strength of the heat insulation cover, enabling it to support the pressure-bearing component more stably and reducing the possibility of deformation. The outer edge of the pressure-bearing component rests on the support step, while the middle part is suspended, increasing the space for deformation of the pressure-bearing component. This allows the pressure-bearing component to undergo greater deformation, thereby meeting the needs of higher pressure cooking and significantly improving the performance of the pressure cooking appliance.

[0009] The wire passage on the pressure-bearing component is used for the wire to pass through to achieve electrical connection of the temperature measuring component. The contact point between the elastic component and the pressure-bearing component is located on the outer periphery of the wire passage, which is smaller than the opening. On the one hand, even if the elastic component directly abuts against the pressure-bearing component, the pressure-bearing component itself can provide stable support for the elastic component, making the up-and-down movement of the elastic component and the temperature measuring component more reliable and preventing the elastic component from tilting. On the other hand, it can reduce the area of ​​the opening in the deformation part, improve the elastic deformation capacity of the deformation part, and enable the deformation part to form a stable elastic restoring force on the heating plate when it is pressed down by the heating plate, which helps the heating plate to move upward and return to its original position.

[0010] Meanwhile, because the elastic element is supported between the temperature sensing element and the pressure-bearing element, the distance between the two ends of the elastic element is shortened in the initial state (when the pot is not pressurized). This increases the compression of a spring with the same number of coils, providing a more stable force and direction to the temperature sensing element. This ensures that the temperature sensing element floats vertically, maintaining its centered position with the heating plate and inner liner. Even if the temperature sensing element deviates from the vertical direction, it can quickly return to its correct position under the elastic force of the elastic element, thus ensuring the reliability and accuracy of temperature detection. Furthermore, the number of spring coils can be appropriately reduced or a lower-cost material can be used to provide the same elastic force, thereby reducing costs.

[0011] The temperature measuring element includes a fixing part and a detection part. The lower surface of the heating plate is provided with a downward protruding positioning post. The fixing part is provided with a positioning notch for the positioning post to pass through. The detection part passes through the opening and protrudes from the upper surface of the heating plate.

[0012] In this design, the temperature measuring element is pushed upwards by the elastic element, and this push, along with the stop of the heating plate, limits the vertical movement of the temperature measuring element. The elastic element is clamped vertically by the temperature measuring element and the pressure-bearing element. Thus, the heating plate and the pressure-bearing element clamp the temperature measuring element and the elastic element for fixation, eliminating the need for separate fixing of the temperature measuring element to the heating plate or additional fixing structures. This simplifies the structure of the temperature measuring element and reduces assembly difficulty. A downwardly protruding positioning post is provided on the lower side of the heating plate, and a corresponding positioning notch is provided on the temperature measuring element. The insertion and engagement of the positioning post and the positioning notch create radial limiting, preventing lateral displacement of the temperature measuring element. This not only simplifies the assembly steps and improves assembly efficiency but also ensures the reliability of the temperature measuring element's movement.

[0013] There are two positioning posts arranged opposite each other on both sides of the opening. A pressure switch is installed at the bottom of the insulation cover. One of the positioning posts can contact the pressure switch to trigger it.

[0014] In this design, positioning posts are arranged radially opposite to each other on both sides of the opening, and the positioning notches of the temperature measuring elements are correspondingly set on both sides of the detection section. This creates a limit on both sides of the temperature measuring elements, ensuring the limiting effect while also making the force on the temperature measuring elements more evenly distributed. One of the positioning posts not only plays a role in positioning in conjunction with the temperature measuring element but also undertakes pressure detection. When the inner pot presses the heating plate downward, the positioning post moves downward synchronously. When the pot reaches the set maximum pressure value, the positioning post triggers the pressure switch below, at which point the pressure cooking appliance reacts accordingly, such as shutting off the heating device or performing a pressure reduction operation.

[0015] The diameter of the positioning post gradually increases from bottom to top to form a guide slope on the side of the positioning post facing the opening.

[0016] In this design, the guide slope on the surface of the positioning post increases the gap between the positioning notch and the positioning post as the temperature measuring element moves downward. This reduces wear between the temperature measuring element and the positioning post, allowing for freer movement of the temperature measuring element and reducing resistance during its downward movement. Conversely, as the temperature measuring element floats upward, the gap between the positioning notch and the positioning post decreases, thus gradually enhancing the radial limiting effect on the temperature measuring element. Even if the temperature measuring element deviates from the vertical direction, it can gradually return to center during the upward movement, ensuring effective contact between the temperature measuring element and the center of the bottom wall of the inner liner, thereby guaranteeing accurate temperature measurement.

[0017] The lower surface of the heating plate is provided with a downward protruding positioning post for cooperating with the temperature measuring element. The positioning post passes through the temperature measuring element, and the lower edge of the positioning post is not lower than the bottom surface of the heat insulation cover.

[0018] In this design, the main function of the positioning post is to cooperate with the temperature measuring element to laterally limit the temperature measuring element. Therefore, it is only necessary to ensure that the positioning post passes through the temperature measuring element. If the positioning post does not protrude out of the insulation cover, it can prevent the positioning post from intruding into the space below the insulation cover and interfering with other components, thus saving internal space of the pot body and facilitating the arrangement of various components below the insulation cover.

[0019] The lower surface of the heating plate is provided with a first fixing post protruding downwards, and the pressure bearing component is provided with a fixing hole corresponding to the first fixing post. The first fixing post and the fixing hole are fitted together to fix the pressure bearing component and the heating plate to clamp the temperature measuring component and the elastic component.

[0020] In this design, during assembly, the temperature sensing element and the elastic element are placed in preset positions. Then, the first fixing post mates with the fixing hole to fix the heating plate and the pressure-bearing element. After fixing, the two clamp the elastic element and the temperature sensing element to form a fixed assembly. At this point, the heating plate, the pressure-bearing element, and the elastic element and temperature sensing element between them together form a single component. In subsequent assembly, it is only necessary to fix this entire component to the insulation cover, without assembling each component individually, thus greatly simplifying the assembly steps and improving assembly efficiency.

[0021] The lower surface of the heating plate is provided with a downward protruding second fixing post, and the pressure-bearing component is provided with a through-hole corresponding to the second fixing post. The second fixing post passes through the through-hole to cooperate with and fix it to the bottom wall of the heat insulation cover.

[0022] In this design, the heating plate is fixed to the insulation cover via a second fixing post. The assembly of the heating plate and insulation cover is completed simultaneously with the assembly of other components such as the temperature measuring element and the pressure-bearing component. Furthermore, the second fixing post engages with the through-hole on the pressure-bearing component, further improving the positioning of the heating plate and the pressure-bearing component and reducing assembly difficulty.

[0023] The distance between the central area of ​​the heating plate and the pressure-bearing component is greater than the distance between the edge area of ​​the heating plate and the pressure-bearing component, so as to form a heat transfer arc surface on the upper surface of the heating plate for contact with the bottom wall of the inner liner.

[0024] In this design, the heat transfer arc surface allows the pressure of the inner liner on the heating plate to be more evenly distributed, enabling the heating plate to stably support the inner liner and preventing damage or deformation due to localized stress concentration on the heating plate.

[0025] The sidewall of the heat insulation cover is provided with multiple positioning ribs at intervals along the circumference. The positioning ribs are located on the outside of the pressure-bearing component so as to cooperate with the edge of the pressure-bearing component to limit the radial movement of the pressure-bearing component.

[0026] In this design, multiple positioning ribs are spaced circumferentially along the sidewall of the insulation cover. These ribs are located on the outer side of the pressure-bearing component and can cooperate with the outer edge stop of the pressure-bearing component to position and radially limit its movement. During installation, the pressure-bearing component is placed within the space enclosed by the positioning ribs, ensuring its centering relative to the insulation cover. When the pressure-bearing component is pressed down by the heating plate, the positioning ribs act as a stop, restricting lateral movement and ensuring the component remains coaxial with the insulation cover.

[0027] The thickness of the pressure-bearing component is 1-2mm, the diameter of the heating plate is D1, and the diameter of the pressure-bearing component is D2, wherein 0.9D1≤D2≤D1.

[0028] In this design, the large-area pressure-bearing components have a simpler structure, more stable production quality, and improved overall machine safety. Furthermore, the large-area pressure-bearing components allow for greater deformation, enabling the pressure cooker to cook at higher pressures. Attached Figure Description

[0029] 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:

[0030] Figure 1 This is a cross-sectional view of the pot body structure according to one embodiment of the present invention;

[0031] Figure 2 for Figure 1 A magnified view of area A in the middle;

[0032] Figure 3 This is a schematic diagram of the temperature measuring element according to one embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the lower structure of the heating plate according to one embodiment of the present invention;

[0034] Figure 5 This is a structural schematic diagram of a pressure-bearing component according to one embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the bottom structure of the heat insulation cover according to one embodiment of the present invention;

[0036] Figure 7 for Figure 6 Top view of the central insulation cover.

[0037] in:

[0038] 1. Insulation cover; 11. Supporting steps; 12. Pressure switch; 13. Positioning ribs;

[0039] 2 Heating plate; 21 Positioning post; 211 Guide slope; 22 Opening; 23 Heat collection groove; 24 Heat transfer arc surface; 25 First fixing post; 26 Second fixing post;

[0040] 3 Temperature measuring element; 31 Detection section; 32 Fixing section; 321 Positioning notch;

[0041] 4. Elastic components;

[0042] 5. Pressure-bearing component; 51. Support part; 52. Deformation part; 53. Fixing hole; 54. Through port; 55. Wire through port;

[0043] 6. Inner liner. Detailed Implementation

[0044] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] like Figure 1 , Figure 2 As shown, a pressure cooking appliance includes a heat preservation cover 1 and a heating plate 2 placed inside the heat preservation cover 1. A pressure-bearing member 5 is provided between the bottom wall of the heating plate 2 and the heat preservation cover 1. The side wall of the heat preservation cover 1 is provided with a support step 11 protruding towards the inside of the heat preservation cover 1. The pressure-bearing member 5 includes a deformable part 52 and a support part 51 surrounding the outer periphery of the deformable part 52. The support part 51 rests against the support step 11. There is a deformation space between the deformable part 52 and the bottom wall of the heat preservation cover 1. An opening 22 is provided in the central area of ​​the heating plate 2. The pressure cooking appliance also includes a temperature measuring member 3 and an elastic member 4. The temperature measuring member 3 passes through the opening 22 to contact the inner pot 6. The upper end of the elastic member 4 acts on the temperature measuring member 3, and the lower end abuts against the deformable part 52.

[0050] In this invention, the pressure-bearing component 5 is a structure made of elastic material, preferably a manganese sheet. The heating plate 2 and the pressure-bearing component 5 are fixed together. The pressure-bearing component 5 can deform when it is pressed down by the heating plate 2, and can drive the heating plate 2 to move upward and reset under its own elastic force.

[0051] Preferably, such as Figure 1As shown, the thickness of the pressure-bearing component 5 is 1-2mm, the diameter of the heating plate 2 is D1, and the diameter of the pressure-bearing component 5 is D2, where 0.9D1≤D2≤D1. The large-area pressure-bearing component 5 has a simpler structure, more stable production quality, and improves the overall safety of the machine. At the same time, the large-area pressure-bearing component 5 can achieve a greater range of deformation, thus enabling the pressure cooking appliance to cook at higher pressures.

[0052] In this utility model, such as Figure 1 As shown, the side wall of the heat insulation cover 1 is provided with a support step 11. The support part 51 of the outer edge of the pressure-bearing component 5 rests on the support step 11, so that the support position of the heat insulation cover 1 on the support component is transferred from the original bottom support to the side support, thereby avoiding the impact of the bottom deformation of the heat insulation cover 1 on the accuracy of pressure detection. Since the bottom wall of the heat insulation cover 1 is a large flat structure with relatively weak structural strength, the support step 11 on the side wall supports the pressure-bearing component 5, which can transfer the force position of the heat insulation cover 1 from the bottom wall to the side wall, thereby ensuring the structural stability of the bottom wall, keeping the distance between the pressure switch 12 and the heating plate 2 fixed, and achieving precise pressure control. In addition, the support step 11 also increases the strength of the heat insulation cover 1, making it able to support the pressure-bearing component 5 more stably and reducing the possibility of deformation. The outer edge of the pressure-bearing component 5 rests on the support step 11, while the middle part is suspended, thereby increasing the space for deformation of the pressure-bearing component 5, allowing the pressure-bearing component 5 to undergo greater deformation, thereby meeting the needs of higher pressure cooking and significantly improving the performance of the pressure cooking appliance. Compared to conventional 70 kPa pressure cooking, the pressure cooking appliance of this invention can perform cooking at 100 kPa or even higher pressure.

[0053] Preferably, the elastic element 4 is a spring to save costs.

[0054] The wire passage 55 on the pressure-bearing component 5 is provided for the passage of wires to achieve electrical connection of the temperature measuring component 3, such as... Figure 2 , Figure 5 As shown, the contact point between the elastic element 4 and the pressure-bearing element 5 is located on the outer periphery of the wire passage 55. The diameter D1 of the wire passage 55 is smaller than the diameter D2 of the opening 22. On the one hand, this provides more stable support for the elastic element 4, making the up-and-down movement of the elastic element 4 and the temperature measuring element 3 more reliable and accurate, and preventing the elastic element 4 from tilting. On the other hand, it can reduce the area of ​​the opening of the deformation part 52, improve the elastic deformation capacity of the deformation part 52, and enable the deformation part 52 to form a stable elastic restoring force on the heating plate 2 when it is pressed down by the heating plate 2, which helps the heating plate 2 to move upward and return to its original position.

[0055] Specifically, opening 22 and cable pass 55 are coaxially set.

[0056] Because the elastic element 4 is supported between the temperature measuring element 3 and the pressure-bearing element 5, in the initial state (when the pot is not pressurized), the distance between the two ends of the elastic element 4 is shortened, increasing the compression of the spring with the same number of coils. This provides a more stable force and direction to the temperature measuring element 3, ensuring that the temperature measuring element 3 floats vertically and remains centered with the heating plate 2 and the inner pot 6. Even if the temperature measuring element 3 deviates from the vertical direction, it can quickly return to its correct position under the elastic force of the elastic element 4, thus ensuring the reliability and accuracy of temperature detection. Furthermore, the number of spring coils can be appropriately reduced or a lower-cost material can be used to provide the same elastic force, thereby reducing costs.

[0057] Specifically, the upper end of the elastic element 4 can abut against the top wall of the temperature measuring element 3. Alternatively, the temperature measuring element 3 can be designed as a variable diameter structure to form a stepped surface between two parts with different diameters, with the upper end of the elastic element 4 abutting against the stepped surface.

[0058] As a preferred embodiment of this utility model, such as Figure 2 , Figure 3 As shown, the temperature measuring element 3 includes a fixing part 32 and a detection part 31. The lower surface of the heating plate 2 is provided with a downward protruding positioning post 21. The fixing part 32 is provided with a positioning notch 321 for the positioning post 21 to pass through. The detection part 31 passes through the opening 22 and protrudes from the upper surface of the heating plate 2.

[0059] In the existing technology, it is often necessary to fix the temperature measuring element 3 to the heating plate 2. For example, a screw post is set on the heating plate 2, and the temperature measuring element 3 is fixed on the screw post by screws. This method not only requires machining threads on the heating plate 2, which increases the machining difficulty, but also has low assembly efficiency.

[0060] In this embodiment, the temperature measuring element 3 is pushed upward by the elastic element 4, and forms a vertical limit on the temperature measuring element 3 with the stop of the heating plate 2. The elastic element 4 is clamped vertically by the temperature measuring element 3 and the pressure-bearing element 5. Thus, the temperature measuring element 3 and the elastic element 4 are fixed by the vertical clamping of the heating plate 2 and the pressure-bearing element 5, so that the temperature measuring element 3 does not need to be fixed to the heating plate 2, nor does it need to be provided with an additional fixing structure for the temperature measuring element 3, thereby simplifying the structure of the temperature measuring element 3 and reducing the assembly difficulty. The heating plate 2 is provided with a downward protruding positioning post 21 on its lower side, and the temperature measuring element 3 is provided with a corresponding positioning notch 321. Through the insertion and cooperation of the positioning post 21 and the positioning notch 321, the two form a radial limit, preventing the temperature measuring element 3 from shifting laterally. This not only simplifies the assembly steps of the temperature measuring element 3 and improves the assembly efficiency, but also ensures the reliability of the movement of the temperature measuring element 3.

[0061] Specifically, such as Figure 3 As shown, the fixing part 32 is a raised rib surrounding the outer periphery of the detection part 31, and the positioning notch 321 is provided on the edge of the raised rib.

[0062] Furthermore, such as Figure 1 , Figure 2 As shown, there are two positioning posts 21 arranged opposite each other on both sides of the opening 22. A pressure switch 12 is provided at the bottom of the heat insulation cover 1. One of the positioning posts 21 can contact the pressure switch 12 to trigger the pressure switch 12.

[0063] Positioning pins 21 are arranged radially opposite to each other on both sides of opening 22, and positioning notches 321 of temperature measuring element 3 are correspondingly set on both sides of detection part 31, thereby limiting the temperature measuring element 3 on both sides, ensuring the limiting effect, and also making the force on temperature measuring element 3 more evenly distributed.

[0064] One of the positioning pins 21 not only serves to position itself in conjunction with the temperature measuring element 3, but also performs pressure detection. When the inner pot 6 presses the heating plate 2 downward, the positioning pin 21 moves downward synchronously. When the pot reaches the set maximum pressure value, the positioning pin 21 triggers the pressure switch 12 below. At this time, the pressure cooking appliance reacts accordingly, such as turning off the heating device or performing a pressure reduction operation.

[0065] Preferably, such as Figure 2 As shown, the diameter of the positioning post 21 gradually increases from bottom to top, so as to form a guide slope 211 on the side of the positioning post 21 facing the opening 22.

[0066] The guide slope 211 on the surface of the positioning post 21 causes the gap between the positioning notch 321 and the positioning post 21 to increase as the temperature measuring element 3 moves downward. This reduces wear between the temperature measuring element 3 and the positioning post 21, allowing the temperature measuring element 3 to move more freely and reducing resistance during its downward movement. Conversely, as the temperature measuring element 3 floats upward, the gap between the positioning notch 321 and the positioning post 21 decreases, thus gradually enhancing the radial limiting effect on the temperature measuring element 3. Even if the temperature measuring element 3 deviates from the vertical direction, it can gradually return to center during the upward movement, ensuring effective contact between the temperature measuring element 3 and the center of the bottom wall of the inner liner 6, and guaranteeing accurate temperature measurement.

[0067] Preferably, such as Figure 1 As shown, the lower surface of the heating plate 2 is provided with a downward protruding positioning post 21 for limiting and cooperating with the temperature measuring element 3. The positioning post 21 passes through the temperature measuring element 3, and the lower edge of the positioning post 21 is not lower than the bottom surface of the heat insulation cover 1.

[0068] The main function of the positioning post 21 is to cooperate with the temperature measuring element 3 to limit the temperature measuring element 3 laterally. Therefore, it is only necessary to ensure that the positioning post 21 passes through the temperature measuring element 3. If the positioning post 21 does not protrude out of the heat insulation cover 1, it can prevent the positioning post 21 from intruding into the space below the heat insulation cover 1 and interfering with other components, saving the internal space of the pot body and facilitating the arrangement of various components below the heat insulation cover 1.

[0069] It should be noted that in the initial state, that is, when the pot is not pressurized, the lower edge of the positioning post 21 is not lower than the bottom surface of the heat preservation cover 1. When the pot is pressurized, as the air pressure gradually increases, the downward displacement of the heating plate 2 gradually increases. Then the positioning post 21 can extend out of the bottom surface of the heat preservation cover 1 or not extend out of the bottom surface of the heat preservation cover 1. This is not limited here.

[0070] As a preferred embodiment of this utility model, such as Figure 1 , Figure 4 , Figure 5 As shown, the lower surface of the heating plate 2 is provided with a downward protruding first fixing post 25, and the pressure bearing member 5 is provided with a fixing hole 53 corresponding to the first fixing post 25. The first fixing post 25 and the fixing hole 53 are fixed together so that the pressure bearing member 5 and the heating plate 2 clamp the temperature measuring member 3 and the elastic member 4.

[0071] During assembly, the temperature measuring element 3 and the elastic element 4 are placed in preset positions. Then, the first fixing post 25 is engaged with the fixing hole 53 to fix the heating plate 2 and the pressure bearing element 5. After fixing, the two clamp the elastic element 4 and the temperature measuring element 3 to form a fixed structure. At this time, the heating plate 2, the pressure bearing element 5, and the elastic element 4 and the temperature measuring element 3 together form an integral component. In subsequent assembly, it is only necessary to fix this component as a whole to the heat insulation cover 1, without assembling each component individually, thus greatly simplifying the assembly steps and improving assembly efficiency.

[0072] Furthermore, such as Figure 4 , Figure 5 , Figure 6 As shown, the lower surface of the heating plate 2 is provided with a downward protruding second fixing post 26, and the pressure bearing member 5 is provided with a through-hole 54 corresponding to the second fixing post 26. The second fixing post 26 passes through the through-hole 54 to cooperate with and fix the bottom wall of the heat insulation cover 1.

[0073] The heating plate 2 is fixed to the insulation cover 1 by the second fixing post 26. When the heating plate 2 and the insulation cover 1 are assembled, the assembly of other components such as the temperature measuring element 3 and the pressure bearing element 5 is also completed simultaneously. At the same time, the second fixing post 26 is also inserted into the through-hole 54 on the pressure bearing element 5, which can further improve the positioning effect of the heating plate 2 and the pressure bearing element 5 and reduce the assembly difficulty.

[0074] Specifically, such as Figure 4As shown, both the first fixing post 25 and the second fixing post 26 are provided with threaded holes. Fasteners such as screws are passed through the fixing holes 53 and fastened to the threaded holes of the first fixing post 25. Similarly, the second fixing post 26 and the heat insulation cover 1 are also fixedly connected in this way.

[0075] Preferably, such as Figure 1 As shown, the distance between the central area of ​​the heating plate 2 and the pressure-bearing component 5 is greater than the distance between the edge area of ​​the heating plate 2 and the pressure-bearing component 5, so as to form a heat transfer arc surface 24 on the upper surface of the heating plate 2 for contact with the bottom wall of the inner liner 6. The heat transfer arc surface 24 enables the pressure of the inner liner 6 on the heating plate 2 to be more evenly distributed, so that the heating plate 2 stably supports the inner liner 6 and avoids damage or deformation due to local stress concentration of the heating plate 2.

[0076] Specifically, such as Figure 2 As shown, a heat-gathering groove 23 is provided at the center of the upper surface of the heating plate 2, and the opening 22 is located in the heat-gathering groove 23. This allows the heat from the heating plate 2 to be directly transferred to the inner liner 6 through contact, and some of the heat is also gathered in the heat-gathering groove 23 at the center of the heating plate 2. The temperature measuring element 3 is located in the heat-gathering groove 23. Therefore, the heat from the inner liner 6 and the heat from the heating plate 2 can surround the temperature measuring element 3, allowing the temperature measuring element 3 to more accurately sense the temperature of the inner liner 6 and improve the accuracy of temperature measurement.

[0077] In a preferred embodiment, such as Figure 6 , Figure 7 As shown, the side wall of the heat insulation cover 1 is provided with a plurality of positioning ribs 13 at intervals along the circumference. The positioning ribs 13 are located on the outside of the pressure bearing member 5 so as to cooperate with the edge of the pressure bearing member 5 to limit the radial movement of the pressure bearing member 5.

[0078] Multiple positioning ribs 13 are spaced circumferentially along the sidewall of the insulation cover 1, and the positioning ribs 13 are located on the outside of the pressure-bearing component 5. They can cooperate with the outer edge stop of the pressure-bearing component 5 to position and radially limit the pressure-bearing component 5. When the pressure-bearing component 5 is installed, it is placed within the space enclosed by the positioning ribs 13, so that the pressure-bearing component 5 can remain centered relative to the insulation cover 1. When the pressure-bearing component 5 is pressed down by the heating plate 2, the positioning ribs 13 can stop the pressure-bearing component 5, thereby restricting the lateral movement of the pressure-bearing component 5 and keeping the pressure-bearing component 5 coaxial with the insulation cover 1.

[0079] Specifically, the positioning rib 13 can be positioned above the step surface of the supporting step 11 and protrude towards the center of the insulation cover 1, so as to stop against the outer edge of the pressure-bearing member 5 and form a radial limit on the pressure-bearing member 5. Alternatively, the positioning rib 13 can be positioned on the step surface of the supporting step 11 and protrude upward, with the positioning rib 13 located on the outside of the pressure-bearing member 5, which can also form a radial limit on the pressure-bearing member 5. This is not limited here.

[0080] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0081] 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.

[0082] 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 cooking appliance comprising a heat retaining cover and a heating disc arranged inside the heat retaining cover, and a pressure bearing member between the bottom wall of the heating disc and the heat retaining cover, characterized in that, a support step is arranged on the side wall of the heat retaining cover and protrudes towards the inside of the heat retaining cover, the pressure bearing member comprises a deformation part and a support part around the outer periphery of the deformation part, the support part is arranged on the support step, and the deformation part has a deformation space with the bottom wall of the heat retaining cover; an opening is arranged in the central region of the heating disc, a wire passing hole is arranged in the center of the deformation part, the diameter of the opening is larger than the diameter of the wire passing hole, and the pressure cooking appliance further comprises a temperature measuring member and an elastic member, the temperature measuring member passes through the opening to contact the inner container, the upper end of the elastic member acts on the temperature measuring member, and the lower end of the elastic member abuts against the deformation part.

2. The pressure cooking appliance according to claim 1, characterized in that, the temperature measuring member comprises a fixed part and a detection part, the lower surface of the heating disc is provided with a positioning column which protrudes downward, the fixed part is provided with a positioning notch through which the positioning column passes, and the detection part passes through the opening to protrude from the upper surface of the heating disc.

3. The pressure cooking appliance according to claim 2, characterized in that, the positioning column is two and arranged on the two sides of the opening, the bottom of the heat retaining cover is provided with a pressure switch, and one of the positioning columns can contact the pressure switch to trigger the pressure switch.

4. The pressure cooking appliance according to claim 2, characterized in that, the diameter of the positioning column gradually increases from bottom to top to form a guide slope on the side of the positioning column towards the opening.

5. The pressure cooking appliance according to claim 1, characterized in that, the lower surface of the heating disc is provided with a positioning column which protrudes downward and is used for limiting cooperation with the temperature measuring member, the positioning column passes through the temperature measuring member, and the lower edge of the positioning column is not lower than the bottom surface of the heat retaining cover.

6. The pressure cooking appliance according to claim 1, characterized in that, the lower surface of the heating disc is provided with a first positioning column which protrudes downward, the pressure bearing member is provided with a fixing hole corresponding to the first positioning column, and the first positioning column and the fixing hole are fixedly connected to make the pressure bearing member and the heating disc clamp the temperature measuring member and the elastic member.

7. The pressure cooking appliance according to claim 6, characterized in that, the lower surface of the heating disc is provided with a second positioning column which protrudes downward, the pressure bearing member is provided with a passing hole corresponding to the second positioning column, and the second positioning column passes through the passing hole to be fixedly connected with the bottom wall of the heat retaining cover.

8. The pressure cooking appliance according to claim 1, characterized in that, the distance between the central region of the heating disc and the pressure bearing member is greater than the distance between the edge region of the heating disc and the pressure bearing member to form a heat transfer arc surface on the upper surface of the heating disc for contacting the bottom wall of the inner container.

9. The pressure cooking appliance according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ The side wall of the heat preservation cover is provided with a plurality of positioning convex ribs in a circumferential direction, and the positioning convex ribs are located outside the pressure bearing member to cooperate with the edge of the pressure bearing member to limit the pressure bearing member in the radial direction.

10. The pressure cooking appliance according to any one of claims 1 to 9, characterized in that The thickness of the pressure bearing member is 1-2 mm, the diameter of the heating disc is D1, and the diameter of the pressure bearing member is D2, wherein 0.9D1≤D2≤D1.

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