Electronic pressure relief structure for pressure cookers

Abstract

The application discloses an electronic pressure releasing structure for a pressure cooker, which comprises a push rod hinged to a cover, a first end of the push rod corresponding to the bottom of a steam releasing cap, and a second end of the push rod having an inclined sliding fit surface; a connecting rod arranged below the push rod and movably connected to the cover, an upper end of the connecting rod corresponding to the sliding fit surface; a top rod support fixed to the cover, a motor on the top rod support; and a top rod assembly in threaded fit with a driving shaft of the motor. When the top rod assembly is driven to move upward, the connecting rod is pushed to extrude the sliding fit surface, the push rod is swung around the hinge point to lift the steam releasing cap to release steam. The scheme replaces electromagnetic drive with motor-screw mechanical transmission, completely solves the problem of driving force drop caused by heat attenuation of electromagnet at high temperature, and guarantees the stability and reliability of valve opening and closing; the top rod assembly in threaded fit realizes precise displacement control, avoids unexpected opening and closing, significantly improves pressure control precision, and reduces steam leakage and energy consumption.

Description

Technical Field

[0001] This utility model belongs to the field of pressure cooker technology, and in particular relates to an electronic pressure relief structure for pressure cookers. Background Technology

[0002] Currently, commercially available electric pressure cookers generally use electromagnetic structures for automatic venting control. For example, an electromagnetic coil, when energized, generates magnetic force to overcome the attraction of a permanent magnet (or spring force) to open the valve and release air. After power is cut off, the permanent magnet attraction (or spring force) resets and closes the valve. However, this approach has significant drawbacks under high temperature and pressure conditions: the electromagnetic device has poor thermal stability. As the temperature inside the pot continues to rise, the magnetism of the electromagnet weakens, leading to a decrease in driving force. This physical defect reduces the reliability of the venting action—specifically manifested as unstable valve opening amplitude, delayed closing response, and even unexpected opening and closing phenomena. This not only affects the accuracy of pressure control inside the pot but also causes problems such as steam leakage, increased energy consumption, and fluctuations in cooking results. Existing technologies attempt to improve performance by enhancing the heat dissipation of the electromagnet or adjusting material ratios, but this leads to increased costs with limited improvement in effectiveness. Therefore, there is an urgent need to develop a new venting control mechanism that is unaffected by high-temperature environments, has stable driving force, and is cost-effective to overcome these technical bottlenecks. Utility Model Content

[0003] (I) Purpose of the utility model

[0004] To overcome the above shortcomings, the purpose of this utility model is to provide an electronic pressure relief structure for pressure cookers, so as to solve the problems of unstable opening and closing of the exhaust valve, inaccurate pressure control and steam leakage caused by the thermal decay of the electromagnet in the current mainstream electromagnetic exhaust device of electric pressure cookers under high temperature conditions.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the technical solution provided in this application is as follows:

[0007] An electronic pressure relief structure for a pressure cooker includes: a lever hinged to the pressure cooker lid, with its first end corresponding to the bottom of the vent cap on the lid and its second end extending vertically downward and forming an inclined sliding mating surface; a connecting rod movably mounted on the lid and located below the lever, with its upper end corresponding to the sliding mating surface; a top rod bracket located inside the pressure cooker body and below the connecting rod; a motor mounted on the top rod bracket; and a top rod assembly threaded to the motor drive shaft and slidingly mated to the top rod bracket; when the top rod assembly is driven to move upward along the top rod bracket, it extends out of the cooker body and pushes the connecting rod to press the sliding mating surface, thereby causing the lever to swing around the hinge point and lift the vent cap to release steam.

[0008] This embodiment replaces electromagnetic drive with motor-screw mechanical transmission, fundamentally solving the problem of reduced driving force caused by thermal decay of the electromagnet under high-temperature conditions, ensuring the stability and reliability of the exhaust valve's opening and closing action; at the same time, the threaded push rod assembly can achieve precise displacement control, avoiding unexpected opening and closing phenomena, significantly improving the pressure control accuracy inside the pot, and reducing steam leakage and energy waste.

[0009] In some embodiments, a guide groove adapted to the shape of the push rod assembly is formed in the middle of the push rod bracket, into which the motor drive shaft extends and restricts the movement trajectory of the push rod assembly.

[0010] The guide groove design forces the push rod assembly to move in a straight line, completely avoiding movement trajectory deviation caused by assembly errors or vibration, and ensuring effective contact between the sliding surfaces of the connecting rod and the lever. This structure not only improves transmission efficiency but also reduces wear on parts, extends the life of the device, and reduces dependence on assembly precision, thereby improving production yield.

[0011] In some embodiments, the push rod assembly includes: a slider threadedly engaged with a drive shaft, and a push rod sleeved on the drive shaft and located above the slider, moving synchronously with the slider.

[0012] In some embodiments, it further includes: a lever spring: which is laterally disposed between the cover and the second end of the lever, with its two ends fixed to the cover and abutting the lever, respectively.

[0013] After exhaust is completed, the active traction lever resets, compensating for the inadequacy of gravity reset, significantly improving the valve's closing response speed and sealing performance, completely solving the problem of continuous steam leakage caused by the closing delay of the traditional electromagnetic structure, and further reducing energy consumption.

[0014] In some embodiments, the connecting rod includes: a rectangular head whose upper end abuts against a sliding mating surface, and a rod portion that vertically penetrates a guide hole in the liner and engages with the top rod assembly.

[0015] The rectangular head design increases the contact area to disperse local stress, avoids deformation failure caused by long-term compression, and extends the service life of the parts; the fit between the rod and the guide hole constrains lateral displacement, ensures that the force transmission direction is always perpendicular, reduces friction loss, and makes the exhaust action smoother and more stable.

[0016] In some embodiments, it further includes: an elastic sealing cap, sleeved on the upper end of the push rod support, which deforms as the push rod moves to seal the movable gap.

[0017] When the push rod moves up and down, it causes the elastic sealing cover to deform, which in turn pushes the connecting rod to move up and down. The function of the elastic sealing cover is to form a dynamic sealing barrier, effectively preventing high-temperature steam from entering the motor cavity and preventing parts from rusting and short circuits. Attached Figure Description

[0018] Figure 1This is an exploded view of the electronic pressure relief structure for the pressure cooker of this utility model after it has been installed on the pressure cooker.

[0019] Figure 2 This is an assembly diagram of the electronic pressure relief structure for the pressure cooker of this utility model installed on the liner;

[0020] Figure 3 yes Figure 2 A magnified view of part A in the middle;

[0021] Figure 4 This is a cross-sectional view of the push rod assembly, push rod bracket, and motor mounted on the pot body in the electronic pressure relief structure for the pressure cooker of this utility model.

[0022] Figure 5 yes Figure 4 A magnified view of part B in the middle section;

[0023] Figure 6 This is a schematic diagram of the electronic pressure relief structure for the pressure cooker of this utility model;

[0024] Figure 7 This is an exploded view of the electronic pressure relief structure for the pressure cooker of this utility model;

[0025] Figure 8 This is a schematic diagram of the top rod support in the electronic pressure relief structure of the pressure cooker of this utility model;

[0026] Figure 9 This is a cross-sectional view of the top rod support in the electronic pressure relief structure for the pressure cooker of this utility model;

[0027] Figure 10 This is a schematic diagram of the lever in the electronic pressure relief structure of the pressure cooker of this utility model;

[0028] Figure 11 This is a schematic diagram of the connecting rod in the electronic pressure relief structure of the pressure cooker of this utility model.

[0029] Figure label:

[0030] 1. Lever; 101. Rotating shaft; 102. Inclined sliding mating surface; 2. Connecting rod; 201. Rectangular head; 202. Rod part; 3. Top rod assembly; 301. Slider; 302. Top rod; 4. Top rod bracket; 401. Guide groove; 5. Motor; 501. Drive shaft; 6. Elastic sealing cover; 7. Face cover assembly; 701. Liner; 7011. Hinge mounting seat; 7012. Limit seat; 702. Face cover; 8. Lever spring; 9. Exhaust cap; 10. Pot body; 11. Sealing gasket; 1101. Push column; 12. Exhaust pipe. Detailed Implementation

[0031] 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 specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0032] This utility model provides an electronic pressure relief structure for a pressure cooker, comprising: a lever 1, a connecting rod 2, a top rod bracket 4, a motor 5, and a top rod assembly 3. Specifically, a hinged mounting base 7011 is provided on the side of the cover 701, and the lever 1 forms a rotating shaft 101 on both sides that is hinged to the hinged mounting base 7011. The first end of the lever 1 extends to the bottom of the vent cap 9 mounted on the cover 701 and maintains a gap of about 1-3mm therewith, while the second end extends vertically downward and the end is machined into a sliding mating surface 102 with a 45° inclination. Furthermore, a vertically movable connecting rod 2 is provided directly below the lever 1. A hinged mounting base 7012 and a guide hole are provided on the cover 701, which are adapted to the shape of the connecting rod 2. The upper end of the connecting rod 2 corresponds to the inclined sliding mating surface 102 of the lever 1, and the lower end extends downward through the guide hole. The connecting rod 2 can move up and down along the guide hole. After moving to its position, it is limited by the hinged mounting base 7012. The top rod bracket 4 is installed inside the pressure cooker body 10, corresponding to the lower part of the connecting rod 2. A micro stepper motor 5 (power 5-10W) is vertically mounted on the bracket. Specifically, the top rod assembly 3 consists of a slider 301 and a top rod 302. The slider 301 is threadedly engaged with the drive shaft 501 of the motor 5, and the top rod 302 is sleeved on the drive shaft 501 and rigidly connected to the slider 301. When motor 5 rotates forward, push rod assembly 3 moves upward along push rod bracket 4, pushing connecting rod 2 to press the inclined sliding surface 102 of lever 1, forcing lever 1 to swing clockwise around hinge point, thereby lifting exhaust cap 9 to achieve exhaust. When motor 5 rotates in reverse, push rod assembly 3 moves downward and no longer contacts inclined sliding surface 102. The first end of lever 1 swings downward under the action of gravity and disengages from exhaust cap 9. Exhaust cap 9 moves downward to block exhaust pipe.

[0033] Specifically, the pressure cooker includes a lid assembly 7 and a pot body 10. The lid assembly 7 further includes a liner 701 and a lid 702, forming an installation cavity between the liner 701 and the lid 702 for mounting the lever 1 and the connecting rod 2. The push rod bracket 4, the motor 5, and the push rod assembly 3 are installed in the pot body 10. The push rod assembly 3 can extend out of the pot body 10 to trigger the lever 1 to swing. Specifically, the lower end of the vent cap 9 is located above the lid 702. A sealing gasket 11 is provided on the lid 702, located below the vent cap 9. Multiple push rods 1101 are provided on the sealing gasket 11. The top of the push rod 1101 corresponds exactly to the bottom of the vent cap 9, and extends downward into the space inside the pot lid (installation cavity). When the lever 1 swings clockwise around the hinge point, it can push the push rod 1101 upward. The push rod 1101 elastically deforms and bulges upward, which can lift the vent cap 9, allowing steam to escape. After the air is released, the pushing force disappears, and the elastic sealing gasket 11 will shrink and return to its original shape. The pusher 1101 moves down, and the vent cap 9 re-seals the opening of the vent pipe 12. Specifically, an installation groove can be made on the cover 702 for the sealing gasket 11 to be embedded and its edges pressed tightly.

[0034] Specifically, motor 5 is connected to the main control board. The start, stop, forward and reverse rotation of motor 5 are all controlled by the program on the main control board, and the pressure cooker can realize the automatic venting function.

[0035] Specifically, a rectangular guide groove 401 (0.5mm wider than the slider 301) is formed in the middle of the push rod bracket 4, and this groove runs through the upper and lower surfaces of the bracket. Furthermore, the motor drive shaft 501 passes through the bottom of the groove and is threadedly connected to the slider 301. In this way, the guide groove 401 not only restricts the movement trajectory of the push rod assembly 3 to a purely linear movement, but also avoids radial offset caused by vibration.

[0036] For the push rod assembly 3, its slider 301 is made of nylon to reduce the coefficient of friction, and has an embedded brass threaded sleeve that mates with the motor drive shaft 501. Based on this, the push rod 302 has a cylindrical structure with a blind hole inside, fitting onto the upper part of the drive shaft 501, and its top plane is in contact with the lower end face of the connecting rod 2. Specifically, the slider 301 and the push rod 302 achieve synchronous movement via a pin or welding; this design ensures efficient transmission of driving force and avoids relative rotation.

[0037] Preferably, this application adds a lever spring 8 to optimize the reset performance. Specifically, the spring is arranged laterally between the inner wall of the cover 701 and the second end of the lever 1. It is a stainless steel compression spring with a wire diameter of 0.8mm, one end of which is fixed to the slot or post of the cover 701, and the other end abuts against the protrusion on the side of the lever 1. When the push rod 302 moves upward and presses the inclined sliding surface 102, the lever 1 swings clockwise and compresses the lever spring 8. When the exhaust ends and the push rod 302 moves downward, the lever spring 8 drives the lever 1 to quickly reset counterclockwise under its own elastic force, shortening the closing response time of the exhaust cap 9 to within 0.5 seconds (3 times better than the traditional electromagnetic structure). It is worth noting that a torsion spring can also be used instead of the compression spring, which is installed at the hinge shaft of the lever 1 to achieve the same function.

[0038] Specifically, the upper end of the connecting rod 2 is a rectangular head 201, which contacts the inclined sliding surface 102 of the lever 1 to distribute stress; the lower end is a cylindrical rod portion 202, which vertically penetrates the guide hole of the cover 701. Preferably, the surface of the rod portion 202 is chrome-plated to reduce friction, while a polytetrafluoroethylene bushing is embedded in the guide hole to ensure smooth movement. In this way, the connecting rod 2 always maintains a vertical direction when moving up and down, avoiding jamming caused by lateral deviation. At the same time, a lever spring 8 with appropriate elasticity is selected to avoid excessive elasticity of the lever spring 8, which could cause the connecting rod 2 to shift laterally and jam.

[0039] Preferably, an elastic sealing cover 6 (made of silicone, 2mm thick) is added to the upper end of the push rod bracket 4. The sealing cover has a bowl-shaped structure, and its edge is fixed to the upper end face of the bracket by an interference fit. When the push rod 302 moves up and down, the pleated area of ​​the elastic sealing cover 6 undergoes elastic deformation, and is either pushed up by the top of the push rod 302 or returns to its original position under its own elastic force. The elastic sealing cover 6 effectively prevents high-temperature steam from entering the motor cavity 5.

[0040] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An electronic pressure relief structure for a pressure cooker, characterized by comprising: The utility model relates to a pressure cooker steam exhaust device, comprising: A push rod (1) hinged to a pressure cooker cover (701), the first end of which corresponds to the bottom of a steam exhaust cap (9) on the cover (701), and the second end of which extends vertically downward and forms an inclined sliding fit surface (102) at the end; a connecting rod (2) movably arranged on the cover (701) below the push rod (1), the upper end of which corresponds to the sliding fit surface (102); a top rod support (4) arranged in the pressure cooker body below the connecting rod (2); a motor (5) arranged on the top rod support (4); a top rod assembly (3) threadedly connected to the drive shaft (501) of the motor (5) and slidingly connected to the top rod support (4); when the top rod assembly (3) is driven to move upward along the top rod support (4), it extends out of the pressure cooker body and pushes the connecting rod (2) to press the sliding fit surface (102), so that the push rod (1) swings around the hinge point to lift the steam exhaust cap (9) for steam exhaust.

2. The electronic pressure relief structure for a pressure cooker according to claim 1, wherein A guide groove (401) is formed in the middle of the top rod support (4) and is adapted to the shape of the top rod assembly (3), so that the motor drive shaft (501) extends into the guide groove (401) and limits the movement trajectory of the top rod assembly (3).

3. The electronic pressure relief structure for a pressure cooker according to claim 1, wherein The top rod assembly (3) comprises a sliding block (301) threadedly connected to the drive shaft (501), a top rod (302) sleeved on the drive shaft (501) and located above the sliding block (301), and a connecting rod (2) connected to the sliding block (301) and moving synchronously.

4. The electronic pressure relief structure for a pressure cooker according to claim 1, wherein Further comprising: A push rod spring (8) arranged transversely between the cover (701) and the second end of the push rod (1), and fixed to the cover (701) and abutting against the push rod (1) at both ends.

5. The electronic pressure relief structure for a pressure cooker according to claim 1, wherein The connecting rod (2) comprises a rectangular head (201) abutting against the sliding fit surface (102) at the upper end, and a rod portion (202) vertically penetrating a guide hole in the cover (701) and abutting against the top rod assembly (3).

6. The electronic pressure relief structure for a pressure cooker according to claim 1, wherein Further comprising: An elastic sealing cover (6) sleeved on the upper end of the top rod support (4) and deformed to seal the moving gap along with the movement of the top rod (302).

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