Pressure cooker lid pressure relief device and method

Abstract

This invention discloses a pressure relief device for a pressure cooker lid, comprising: a lid, with a connecting pipe connected to the top of the lid; a sleeve, connected to the top of the connecting pipe and communicating with the connecting pipe, the sleeve having multiple layers of pressure relief holes along the axial direction on its side wall; a push rod, axially movable and disposed within the sleeve, its lower end having a rod head for sealing the lowest layer of pressure relief holes on the side wall of the sleeve, the rod head having a hollow structure to allow gas to flow upward through the rod head, the upper end of the push rod body passing through the top of the sleeve and extending out; a piston, axially movable and sleeved outside the push rod body and located inside the sleeve, for sealing the remaining layers of pressure relief holes in the normal state; a first spring, sleeved outside the push rod body, one end abutting against the piston and the other end abutting against the inner bottom surface of the sleeve; a pressure cap, having a cavity for the sleeve to be disposed therein, the pressure cap being movable up and down in linkage with the upper end of the push rod; and a second spring, disposed within the cavity of the pressure cap, one end abutting against the sleeve and the other end abutting against the cavity.

Description

Technical Field

[0001] This invention relates to the field of cooking appliance technology, specifically to a pressure cooker lid pressure relief device and pressure relief method. Background Technology

[0002] Pressure cookers are widely used because they shorten cooking time, retain nutrients and enhance taste, and effectively save energy. To ensure safety, pressure cookers are typically equipped with pressure relief devices. Existing pressure cooker pressure relief devices are mostly single-function designs; for example, some use a pressure-limiting valve for automatic pressure release, while others use a manual button for rapid pressure release. However, these single-function devices cannot simultaneously meet the needs of user-initiated pressure release and automatic multi-stage pressure release based on the pressure inside the pot. For example, devices with only automatic pressure release cannot release pressure in time when the user needs to open the lid quickly; while devices with only manual pressure release may pose a safety risk due to excessive pressure when unattended. Therefore, existing pressure relief devices suffer from low functional integration and an inability to balance safety and convenience. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pressure cooker lid pressure relief device and method that can simultaneously realize manual pressure relief and automatic multi-stage pressure relief according to the pressure inside the pot, in view of the above-mentioned defects of the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A pressure relief device for a pressure cooker lid includes: a lid, the top of which is connected to a connecting pipe communicating with its interior; a sleeve connected to the top of the connecting pipe and communicating with it, the sleeve having multiple layers of pressure relief holes distributed axially from bottom to top on its side wall; and a push rod axially movable within the sleeve, its lower end having a rod head for sealing the lowest layer of pressure relief holes on the side wall of the sleeve, the rod head having a hollow structure to allow gas to flow upward through the rod head, the upper end of the push rod body passing through... The sleeve extends outward from the top; a piston, axially movable, is fitted outside the push rod and located inside the sleeve, used to seal the pressure relief holes of the remaining layers under normal conditions; a first spring, fitted outside the push rod, with one end abutting against the piston and the other end abutting against the inner bottom surface of the sleeve; a gland, having a cavity for the sleeve to be disposed therein, the gland being movable up and down in linkage with the upper end of the push rod; a second spring, disposed in the cavity of the gland, with one end abutting against the sleeve and the other end abutting against the cavity.

[0005] Furthermore, the multi-layer pressure relief holes include a first pressure relief hole, a second pressure relief hole, a third pressure relief hole, and a fourth pressure relief hole distributed sequentially from bottom to top along the axial direction of the sleeve, and the first pressure relief hole, the second pressure relief hole, the third pressure relief hole, and the fourth pressure relief hole are all distributed in multiples along the circumference of the sleeve.

[0006] Furthermore, the push rod body is composed of multiple stepped shafts, including a first stepped shaft, a second stepped shaft, and a third stepped shaft from bottom to top. The outer diameter of the first stepped shaft is larger than the outer diameter of the second stepped shaft, and the outer diameter of the second stepped shaft is larger than the outer diameter of the third stepped shaft. The first stepped shaft is used to abut against the inner bottom surface of the sleeve. The third stepped shaft passes through the top of the sleeve and is connected to a connector. The connector is located at the top of the cavity of the pressure cap. One end of the second spring abuts against the sleeve, and the other end abuts against the connector.

[0007] Furthermore, the outer periphery of the rod head is provided with at least one first sealing ring, which abuts against the inner wall surface of the sleeve; the outer periphery of the piston is provided with at least one second sealing ring, which abuts against the inner wall surface of the sleeve; the outer periphery of the push rod body is provided with at least one third sealing ring, which abuts against the inner wall surface of the piston.

[0008] Furthermore, the outer circumference of the rod head is provided with two spaced-apart first sealing rings, the outer circumference of the piston is provided with two spaced-apart second sealing rings, and the outer circumference of the push rod body is provided with three spaced-apart third sealing rings.

[0009] Furthermore, the third sealing ring is disposed on the outer periphery of the first step shaft of the push rod.

[0010] Furthermore, the cross-section of the connecting pipe has a T-shaped structure.

[0011] A pressure relief method for a pressure cooker lid pressure relief device, characterized by comprising the following steps: Manual pressure relief procedure: In response to the downward pressing operation of the pressure cap, the push rod moves downward against the elastic force of the second spring under the drive of the pressure cap, causing the rod head to move downward and open the first pressure relief hole. The high-pressure gas in the pot enters the sleeve through the connecting pipe. The high-pressure gas in the sleeve passes through the hollow structure of the rod head and is discharged from the first pressure relief hole through the gap between the sleeve and the pressure cap. Reset Procedure: When manual pressure relief is completed, the push rod moves upward under the action of the second spring to reset, so that the rod head re-seals the first pressure relief hole.

[0012] A pressure relief method for a pressure cooker lid pressure relief device, characterized by comprising the following steps: Automatic pressure relief steps: When the pressure inside the pot reaches the first preset value, the high-pressure gas entering the sleeve flows upward through the hollow structure of the rod head and acts on the piston, pushing the piston to overcome the elastic force of the first spring and move upward, so that the piston opens the second pressure relief hole. The gas is discharged from the opened second pressure relief hole through the gap between the sleeve and the pressure cap, realizing the first-level automatic pressure relief. When the pressure inside the pot reaches a second preset value that is greater than the first preset value, the gas pushes the piston to move upward further, and at the same time opens the second and third pressure relief holes, increasing the exhaust flow and realizing two-stage automatic pressure relief. When the pressure inside the pot reaches a third preset value that is greater than the second preset value, the gas pushes the piston to move further upward, and at the same time opens the second, third and fourth pressure relief holes, realizing three-stage automatic pressure relief at maximum flow.

[0013] Furthermore, in the automatic pressure relief step, the first pressure relief hole is always kept blocked by the rod head.

[0014] Compared with existing technologies, this technical solution achieves the following beneficial effects: This device integrates manual rapid pressure relief and automatic multi-stage safety pressure relief functions into a compact unit, allowing users to actively intervene while enjoying automatic safety protection, thus enhancing safety. Through the cooperation of the piston and multiple pressure relief holes, a graded pressure relief mechanism is achieved, automatically adjusting the exhaust volume according to the pressure level. This avoids the risks of frequent opening or poor exhaust of single-stage safety valves, providing more refined and reliable safety protection. A hollowed-out rod head and an independent spring reset system cleverly separate the airflow channel for manual pressure relief (first pressure relief hole) from the airflow channel for automatic pressure relief (second pressure relief hole and above), ensuring that automatic pressure relief does not affect the closed state of the manual pressure relief channel, guaranteeing independent and stable operation of the two functions. Detailed design features such as multiple sealing rings and T-shaped connecting pipes ensure the device's sealing performance, structural stability, and long service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the pressure cooker lid pressure relief device of the present invention; Figure 2 This is an exploded structural diagram of the pressure relief device for the pressure cooker lid of the present invention; Figure 3 This is a schematic diagram of the overall structure of the pressure relief component of the present invention; Figure 4 This is an exploded structural diagram of the pressure relief component of the present invention; Figure 5 This is a cross-sectional structural schematic diagram of the pressure relief device (normal pressure state) for the pressure cooker lid of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of the AA section in the diagram; Figure 7 This is a cross-sectional view of the pressure relief device for the pressure cooker lid of the present invention (manual pressure relief state); Figure 8 for Figure 7 A magnified schematic diagram of the BB part in the image; Figure 9This is a cross-sectional structural schematic diagram of the pressure relief device (active pressure relief state) for the pressure cooker lid of the present invention; Figure 10 for Figure 9 A magnified schematic diagram of the CC local structure in the image; Figure 11 This is a cross-sectional structural schematic diagram of the pressure relief device (active pressure relief state) for the pressure cooker lid of the present invention; Figure 12 for Figure 11 A magnified schematic diagram of the DD local structure. In the diagram: 1. Pot lid; 2. Connecting pipe; 3. Sleeve; 4. Push rod; 5. Piston; 6. First spring; 7. Pressure cap; 8. Second spring; 9. First sealing ring; 10. Second sealing ring; 11. Third sealing ring; 31. First pressure relief hole; 32. Second pressure relief hole; 33. Third pressure relief hole; 34. Fourth pressure relief hole; 41. Rod head; 42. First stepped shaft; 43. Second stepped shaft; 44. Third stepped shaft; 45. Connecting piece. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1 to 12As shown, this technical solution provides a pressure relief device for a pressure cooker lid, including: a lid 1, with a connecting pipe 2 communicating with its interior connected to the top of the lid 1; a sleeve 3, connected to the top of the connecting pipe 2 and communicating with the connecting pipe 2, the side wall of the sleeve 3 having multiple layers of pressure relief holes distributed axially from bottom to top; and a push rod 4, axially movable inside the sleeve 3, the lower end of which has a rod head 41 for sealing the lowest layer of pressure relief holes on the side wall of the sleeve 3, the rod head 41 having a hollow structure to allow gas to flow upward through the rod head 41, and the push rod 4 having a hollow structure. The piston 5, which is axially movable, is fitted outside the push rod 4 and located inside the sleeve 3, and is used to seal the pressure relief holes of the remaining layers under normal conditions; the first spring 6, which is fitted outside the push rod 4, with one end abutting against the piston 5 and the other end abutting against the inner bottom surface of the sleeve 3; the pressure cap 7, which has a cavity in which the sleeve 3 is housed, and the pressure cap 7 is movable up and down in linkage with the upper end of the push rod 4; the second spring 8, which is located in the cavity of the pressure cap 7, with one end abutting against the sleeve 3 and the other end abutting against the cavity. This invention solves the problem that the traditional pressure relief device has a single function and cannot simultaneously meet the user's need for active intervention in pressure relief and automatic multi-stage pressure relief according to the pressure inside the pot. By setting up a connecting pipe 2 connected to the pot lid 1, a sleeve 3 with multiple pressure relief holes, a movable push rod 4 and piston 5, and cooperating with the first spring 6, the second spring 8 and the pressure cap 7, the organic combination of manual and automatic pressure relief functions is realized. Its beneficial effects are that the device has a compact structure and high integration, allowing users to quickly and manually release air by pressing the pressure cap 7, and automatically opening the corresponding pressure relief hole for safe pressure release according to the pressure inside the pot when no one intervenes, which significantly improves the convenience and safety of using the pressure cooker.

[0018] like Figures 3 to 4 As shown, the multi-layer pressure relief holes include a first pressure relief hole 31, a second pressure relief hole 32, a third pressure relief hole 33, and a fourth pressure relief hole 34, distributed sequentially from bottom to top along the axial direction of the sleeve 3. Multiple first pressure relief holes 31, second pressure relief holes 32, third pressure relief holes 33, and fourth pressure relief holes 34 are distributed along the circumference of the sleeve 3. This achieves a multi-level gradient design for pressure relief capacity. As the pressure inside the pot gradually increases, the piston 5 can sequentially open more and higher pressure relief holes, forming a multi-stage, high-flow-rate pressure relief channel. This adaptively adjusts the exhaust rate according to the pressure magnitude, ensuring that the pressure is always controlled within a safe range and avoiding safety hazards caused by sudden pressure increases.

[0019] The push rod 4 is composed of multiple stepped shafts, including a first stepped shaft 42, a second stepped shaft 43, and a third stepped shaft 44 from bottom to top. The outer diameter of the first stepped shaft 42 is larger than that of the second stepped shaft 43, and the outer diameter of the second stepped shaft 43 is larger than that of the third stepped shaft 44. The first stepped shaft 42 is used to abut against the inner bottom surface of the sleeve 3. The third stepped shaft 44 passes through the top of the sleeve 3 and is connected to a connector 45. The connector 45 is located at the top of the cavity of the pressure cap 7. One end of the second spring 8 abuts against the sleeve 3, and the other end abuts against the connector 45. This solves the problems of guiding and limiting the movement of the push rod 4 within the sleeve 3, as well as the stability of its linkage with the pressure cap 7.

[0020] At least one first sealing ring 9 is provided on the outer periphery of the rod head 41, and the first sealing ring 9 abuts against the inner wall surface of the sleeve 3; at least one second sealing ring 10 is provided on the outer periphery of the piston 5, and the second sealing ring 10 abuts against the inner wall surface of the sleeve 3; at least one third sealing ring 11 is provided on the outer periphery of the push rod 4, and the third sealing ring 11 abuts against the inner wall surface of the piston 5. Preferably, in this embodiment, two spaced-apart first sealing rings 9 are provided on the outer periphery of the rod head 41, and two spaced-apart second sealing rings 10 are provided on the outer periphery of the piston 5. Three spaced-apart third sealing rings 11 are provided on the outer periphery of the push rod 4. The first sealing rings 9 and 10 solve the sealing problem of each pressure relief hole in the non-working state, preventing abnormal gas leakage. The third sealing rings 11 prevent gas leakage between the piston 5 and the push rod 4, ensuring that the gas pressure acting on the lower end face of the piston 5 can be completely and accurately converted into the driving force to push the piston 5 upward, ensuring the accuracy and reliability of the automatic pressure relief action. This greatly improves the sealing reliability and service life of the device.

[0021] The cross-section of the connecting pipe 2 is T-shaped. The T-shaped structure makes the connection between the connecting pipe 2 and the pot lid 1 more stable, and can better withstand the impact of the airflow during depressurization and the vibration generated by repeated operation of the pressure cap 7, preventing the connection from loosening or being damaged, and enhancing the structural stability and durability of the entire device.

[0022] This technical solution provides two pressure relief methods for the pressure cooker lid pressure relief device. Example 1: As Figures 5 to 8 As shown, a manual pressure relief method for a pressure cooker lid pressure relief device is provided, comprising the following steps: Manual pressure relief procedure: In response to the downward pressing operation of the pressure cap 7, the push rod 4 moves downward against the elastic force of the second spring 8 under the drive of the pressure cap 7, causing the rod head 41 to move downward and open the first pressure relief hole 31. The high pressure gas in the pot enters the sleeve 3 through the connecting pipe 2. The high pressure gas entering the sleeve 3 passes through the hollow structure of the rod head 41 and is discharged from the first pressure relief hole 31 through the gap between the sleeve 3 and the pressure cap 7.

[0023] Reset Procedure: When the manual pressure relief operation is completed and the user releases the pressure cap 7, the push rod 4 moves upward to reset under the elastic force of the second spring 8, and the rod head 41 re-seals the first pressure relief hole 31.

[0024] Another use of manual pressure release is that when the food in the pressure cooker has been cooked, in winter, if the pressure cooker is placed outdoors or left for a period of time, the large temperature difference will cause thermal expansion and contraction, making it impossible to open the pressure cooker lid. You can easily open the pressure cooker lid by manually releasing the pressure.

[0025] Example 2: As Figures 9 to 12 As shown, an automatic pressure relief method for a pressure cooker lid pressure relief device is provided, comprising the following steps: Automatic pressure relief procedure: Without human intervention, when the pressure inside the pot increases due to heating, high-pressure gas enters the sleeve 3 through the connecting pipe 2. After passing through the perforated rod head 41, the gas acts on the lower end face of the piston 5. As the pressure inside the pot gradually increases: When the pressure reaches the first preset value, the gas pushes the piston 5, overcoming the spring force of the first spring 6, and pushes the piston 5 upward, thereby opening the second pressure relief hole 32. The gas is discharged from the opened second pressure relief hole 32 through the gap between the sleeve 3 and the pressure cap 7, realizing the first-level automatic pressure relief.

[0026] If the pressure continues to rise and reaches a second preset value that is greater than the first preset value, the piston 5 is pushed upwards further, and at the same time the second pressure relief hole 32 and the third pressure relief hole 33 are opened, the exhaust flow increases, and a two-stage automatic pressure relief is achieved.

[0027] If the pressure increases further and reaches a third preset value that is greater than the second preset value, the piston 5 is pushed upward to a higher position, and at the same time the second pressure relief hole 32, the third pressure relief hole 33 and the fourth pressure relief hole 34 are opened to achieve three-stage automatic pressure relief at maximum flow.

[0028] Throughout the automatic pressure relief process, since the elastic force of the second spring 8 always acts upward on the push rod 4, the push rod 4 remains stationary. Therefore, the rod head 41 always blocks the first pressure relief hole 31, ensuring the independence of the manual pressure relief function.

[0029] Reset Procedure: When automatic pressure relief is complete and the pressure inside the pot drops below the preset value, the thrust of the gas on piston 5 is less than the elastic force of the first spring 6. Under the action of the first spring 6, piston 5 moves downward to reset, resealing the second pressure relief hole 32, the third pressure relief hole 33, and the fourth pressure relief hole 34. The entire device returns to its initial state. It should be noted that the spring is made of alloy steel.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure relief device for a pressure cooker lid, characterized in that, include: A pot lid (1), the top of which is connected to a connecting pipe (2) communicating with its interior; a sleeve (3), connected to the top of the connecting pipe (2) and communicating with the connecting pipe (2), the side wall of the sleeve (3) is provided with multiple layers of pressure relief holes distributed axially from bottom to top; a push rod (4), which is axially movable inside the sleeve (3), the lower end of which has a rod head for sealing the lowest layer of pressure relief holes on the side wall of the sleeve (3), the rod head is a hollow structure so that gas can flow upward through the rod head, the upper end of the push rod (4) passes through the top of the sleeve (3) and extends out; a piston (5) is axially movable and sleeved on the outside of the push rod (4) and located inside the sleeve (3) to seal the pressure relief holes of the other layers in normal state; the first spring (6) is sleeved on the outside of the push rod (4), with one end abutting against the piston (5) and the other end abutting against the inner bottom surface of the sleeve (3); the pressure cap (7) has a cavity in which the sleeve (3) is disposed, and the pressure cap (7) is movable up and down in linkage with the upper end of the push rod (4); the second spring (8) is disposed in the cavity of the pressure cap (7), with one end abutting against the sleeve (3) and the other end abutting against the cavity.

2. The pressure relief device for a pressure cooker lid according to claim 1, characterized in that, The multi-layer pressure relief holes include a first pressure relief hole (31), a second pressure relief hole (32), a third pressure relief hole (33) and a fourth pressure relief hole (34) distributed sequentially from bottom to top along the axial direction of the sleeve (3), and the first pressure relief hole (31), the second pressure relief hole (32), the third pressure relief hole (33) and the fourth pressure relief hole (34) are all distributed in multiples along the circumference of the sleeve (3).

3. The pressure relief device for a pressure cooker lid according to claim 1, characterized in that, The push rod (4) is composed of multiple stepped shafts, including a first stepped shaft (42), a second stepped shaft (43), and a third stepped shaft (44) from bottom to top. The outer diameter of the first stepped shaft (42) is larger than that of the second stepped shaft (43), and the outer diameter of the second stepped shaft (43) is larger than that of the third stepped shaft (44). The first stepped shaft (42) is used to abut against the inner bottom surface of the sleeve (3). The third stepped shaft (44) passes through the top of the sleeve (3) and is connected to a connector (45). The connector (45) is located at the top of the cavity of the pressure cap (7). One end of the second spring (8) abuts against the sleeve (3), and the other end abuts against the connector (45).

4. The pressure relief device for a pressure cooker lid according to claim 1, characterized in that, The outer periphery of the rod head (41) is provided with at least one first sealing ring (9), which abuts against the inner wall surface of the sleeve (3); the outer periphery of the piston (5) is provided with at least one second sealing ring (10), which abuts against the inner wall surface of the sleeve (3); the outer periphery of the push rod (4) is provided with at least one third sealing ring (11), which abuts against the inner wall surface of the piston (5).

5. The pressure relief device for a pressure cooker lid according to claim 4, characterized in that, The outer periphery of the rod head (41) is provided with two spaced first sealing rings (9), the outer periphery of the piston (5) is provided with two spaced second sealing rings (10), and the outer periphery of the push rod (4) is provided with three spaced third sealing rings (11).

6. The pressure relief device for a pressure cooker lid according to claim 1, characterized in that, The third sealing ring (11) is located on the outer periphery of the first step shaft (42) of the push rod (4).

7. The pressure relief device for a pressure cooker lid according to claim 1, characterized in that, The cross-section of the connecting pipe (2) is T-shaped.

8. A method for relieving pressure using a pressure cooker lid pressure relief device according to any one of claims 1 to 7, characterized in that, Includes the following steps: Manual pressure relief procedure: In response to the downward pressing operation of the pressure cap (7), the push rod (4) moves downward under the drive of the pressure cap (7) against the elastic force of the second spring (8), causing the rod head (41) to move downward and open the first pressure relief hole (31). The high pressure gas in the pot enters the sleeve (3) through the connecting pipe (2). The high pressure gas entering the sleeve (3) passes through the hollow structure of the rod head (41) and is discharged from the first pressure relief hole (31) through the gap between the sleeve (3) and the pressure cap (7). Reset procedure: When manual pressure relief is completed, the push rod (4) moves upward under the action of the second spring (8) to reset, so that the rod head (41) re-seals the first pressure relief hole (31).

9. A method for relieving pressure using a pressure cooker lid pressure relief device according to any one of claims 1 to 7, characterized in that, Includes the following steps: Automatic pressure relief steps: When the pressure inside the pot reaches the first preset value, the high-pressure gas entering the sleeve (3) flows upward through the hollow structure of the rod head (41) and acts on the piston (5), pushing the piston (5) to overcome the elastic force of the first spring (6) and move upward, so that the piston (5) opens the second pressure relief hole (32). The gas is discharged from the opened second pressure relief hole (32) through the gap between the sleeve (3) and the pressure cap (7), realizing the first-level automatic pressure relief; When the pressure inside the pot reaches a second preset value that is greater than the first preset value, the gas pushes the piston (5) to move upward further, and at the same time opens the second pressure relief hole (32) and the third pressure relief hole (33), increasing the exhaust flow and realizing two-stage automatic pressure relief; When the pressure inside the pot reaches a third preset value that is greater than the second preset value, the gas pushes the piston (5) to move further upward, and at the same time opens the second pressure relief hole (32), the third pressure relief hole (33) and the fourth pressure relief hole (34) to achieve three-stage automatic pressure relief at maximum flow.

10. The pressure relief method according to claim 9, characterized in that, In the automatic pressure relief step, the first pressure relief hole (31) is always kept blocked by the rod head (41).

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