A pot cover safety locking structure and an electric pressure cooker using the same

Abstract

The present invention discloses a pot cover safety locking structure and an electric pressure cooker using the same, wherein the pot cover safety locking structure comprises a movable push rod and a push rod connecting plate; one end of the push rod connecting plate is fixedly connected to the movable push rod, and a locking hole is provided on the other end of the push rod connecting plate, and the movable push rod is provided with a first spring; the pot cover is provided with a steam actuating mechanism, and the steam actuating mechanism comprises a heat-conducting shell, a stop rod, a first magnet, a second magnet, and a driving member; the driving member can drive the first magnet to separate from the second magnet, so as to drive the stop rod to insert into the locking hole. The pot cover safety locking structure provided by the present invention automatically controls the locking or unlocking of the pot cover according to the temperature in the pot, thereby improving the safety and reliability of the electric pressure cooker.

Description

Technical Field

[0001] The invention relates to the field of household appliances, and in particular to a safety locking structure for a pot cover and an electric pressure cooker using the structure. Background Art

[0002] Most electric pressure cookers currently sold on the market are provided with a safety locking structure for the pot cover, and the pot cover cannot be opened when the pressure difference between the inside and outside of the pot does not reach a predetermined value, such as the safety locking mechanism for the pot cover of the electric pressure cooker disclosed in Chinese Patent No. 200320119447.8. The common structure of this electric pressure cooker includes a pot cover and a handle, a push rod connecting plate is provided between the handle and the pot cover, the push rod connecting plate is arranged along the radial direction of the pot cover, a movable push rod is provided between the pot cover and the side wall of the handle, a first spring is sleeved on the movable push rod, the push rod connecting plate is linked with the movable push rod, a locking hole is provided at the other end of the push rod connecting plate, a hole that is mutually connected with the locking hole is also provided on the handle and the pot cover, a float valve seat is installed at the hole of the pot cover, a float that can move freely up and down is embedded in the valve seat, when the pot cover is closed, the float faces the locking hole on the push rod connecting plate, and under the action of air pressure, the float extends into the locking hole and the hole of the handle, thereby locking the pot cover. When the pressure difference between the inside and outside of the pot reaches a predetermined value, the float drops to the lower part of the push rod connecting plate, rotating the pot cover, and the movable push rod drives the push rod connecting plate to make horizontal reciprocating motion along the radial direction of the pot cover, thereby realizing opening the cover.

[0003] However, this self-locking method of the lid controlled by the pressure inside the pot has many disadvantages: 1. Some foods (such as rice) will expand after being cooked, causing the air pressure in the pot to increase, and the float will not be able to come down for a long time; 2. During use, when the float falls and is unlocked, there is still a large amount of steam inside the electric pressure cooker for a period of time, and the temperature is very high. The operator will be in danger of being scalded by the steam if he opens the lid at this time.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a lid safety locking structure and an electric pressure cooker using the same, aiming to automatically control the locking or unlocking of the lid according to the temperature in the pot, thereby improving the safety and reliability of the electric pressure cooker.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A pot cover safety locking structure, comprising a movable push rod arranged between the pot cover and the side of the pot cover, and a push rod connecting plate arranged between the pot cover and the pot cover; one end of the push rod connecting plate is fixedly connected to the movable push rod, and the other end of the push rod connecting plate is provided with a locking hole, the movable push rod is provided with a first spring, and the movable push rod can reciprocate horizontally along the radial direction of the pot cover; it is characterized in that: the pot cover is provided with a steam actuating mechanism, the steam actuating mechanism comprises a heat-conducting shell fixed to the pot cover, a stop rod movable up and down is provided in the heat-conducting shell, a first magnet fixed to the heat-conducting shell, a second magnet fixed to the stop rod, and a driving member arranged between the first magnet and the second magnet; wherein the first magnet and / or the second magnet are soft magnets; the driving member can drive the first magnet to separate from the second magnet to drive the stop rod to insert into the locking hole.

[0008] The heat-conducting shell comprises a positioning platform and a sleeve arranged on the positioning platform; the sleeve is provided with an external thread, and the sleeve is fixed on the pot cover through a nut and the external thread.

[0009] A sealing gasket is arranged between the nut and the pot cover.

[0010] The first magnet has a first step, the second magnet has a second step, the driving member is a second spring, and the two ends of the second spring are respectively sleeved on the first magnet and the second magnet, so that the second spring is located between the first step and the second step.

[0011] The stop rod includes an integrally formed rod body and a connecting portion, the rod body is fixedly connected to the second magnet via the connecting portion, and the connecting portion wraps the second step.

[0012] A fixing cover is also provided on the free end of the sleeve, a clamping block is provided on the side wall of the sleeve, a corresponding buckle hole is opened on the fixing cover, the fixing cover and the sleeve are buckled and connected via the buckle hole and the clamping block, and a through hole is opened on the top of the fixing cover for the rod body to pass through.

[0013] The first magnet is a soft magnet, and the second magnet is a hard magnet.

[0014] An electric pressure cooker comprises a pot cover, a pot lid, a pot body, and an inner pot; the pot teeth on the pot cover are rotatably engaged with the pot teeth on the pot body, the inner pot is arranged in the pot body, a sealing ring is arranged between the pot cover and the inner pot, the pot cover is arranged on the upper surface of the pot cover, and the pot cover safety locking structure described in any of the above embodiments is arranged between the pot cover and the pot cover.

[0015] Beneficial effects:

[0016] Compared with the float valve in the existing electric pressure cooker, the safety locking structure of the pot lid provided by the present invention transfers heat to the first magnet and the second magnet through steam, so that the first magnet and the second magnet are attracted or separated according to the preset temperature, thereby automatically locking or unlocking, ensuring that only a small amount of steam is discharged when the user opens the pot lid, and the temperature is relatively low, which greatly reduces the risk of the user being scalded by the steam; in addition, the pressure condition in the pot does not affect the opening and closing of the pot lid. If some food expands after being cooked, causing the air pressure in the pot to increase, the pot lid can still be opened and closed smoothly as long as the temperature in the pot meets the unlocking temperature of the safety locking structure of the pot lid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of the safety locking structure of the lid of the electric pressure cooker provided by the present invention in an unlocked state.

[0018] Figure 2 for Figure 1 A local enlarged view of the L1 region.

[0019] Figure 3 A schematic structural diagram of the safety locking structure of the lid of the electric pressure cooker provided by the present invention in a locked state.

[0020] Figure 4 for Figure 3 A local enlarged view of the L2 area in the middle.

[0021] Explanation of the main component symbols: 1-pot cover, 2-pot cover, 3-movable push rod, 4-push rod connecting plate, 41-locking hole, 31-first spring, 5-steam actuating mechanism, 51-heat-conducting shell, 52-stop rod, 53-first magnet, 54-second magnet, 55-driving member, 511-positioning platform, 512-sleeve, 513-external thread, 59-nut, 11-mounting hole, 50-sealing gasket, 531-first step, 541-second step, 521-rod body, 522-connecting part, 56-fixed cover, 57-block, 58-buckle hole, 6-pot body, 7-inner pot, 8-handle. DETAILED DESCRIPTION

[0022] The present invention provides a safety locking structure for a pot cover 1 and an electric pressure cooker using the same. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0023] See also Figure 1-4The embodiment of the first aspect of the present invention provides a safety locking structure for a pot cover 1, comprising a movable push rod 3 arranged between the sides of the pot cover 1 and the pot cover 2, and a push rod connecting plate 4 arranged between the pot cover 1 and the pot cover 2; one end of the push rod connecting plate 4 is fixedly connected to the movable push rod 3, and the other end of the push rod connecting plate 4 is provided with a locking hole 41, the movable push rod 3 is provided with a first spring 31, and the movable push rod 3 can reciprocate horizontally along the radial direction of the pot cover 1; the pot cover 1 is provided with a steam actuating mechanism 5, and the steam actuating mechanism 5 includes a spring fixed at The heat-conducting shell 51 on the pot cover 1 is provided with a stop rod 52 which can move up and down, a first magnet 53 fixed on the heat-conducting shell 51, a second magnet 54 fixed on the stop rod 52, and a driving member 55 arranged between the first magnet 53 and the second magnet 54; wherein the first magnet 53 and / or the second magnet 54 are soft magnets; the driving member 55 can drive the first magnet 53 to separate from the second magnet 54, so as to drive the stop rod 52 to be inserted into the locking hole 41.

[0024] When the electric pressure cooker starts to cook, since steam has not yet been generated in the cooker, the first magnet 53 and the second magnet 54 are at room temperature, and both the first magnet 53 and the second magnet 54 are magnetic. The first magnet 53 and the second magnet 54 are attracted to each other, so the movable push rod 3 can move back and forth horizontally along the radial direction of the pot cover 1 under the action of the external force and the first spring 31, that is, the pot cover 1 can be opened at this time. During the cooking process, the water in the food boils and produces steam, and the steam transfers heat to the first magnet 53 and the second magnet 54 through the heat-conducting shell 51. When the temperature in the pot reaches the preset temperature of the first magnet 53 and / or the second magnet 54, the magnetism of the first magnet 53 and / or the second magnet 54 disappears. At this time, the stress of attraction between the first magnet 53 and the second magnet 54 is sharply reduced, and the force of the driving member 55 is greater than the magnetic attraction stress of the first magnet 53 and the first magnet 53, so that the first magnet 53 and the second magnet 54 are separated, thereby driving the stop rod 52 to move upward, so that the stop rod 52 is inserted into the locking hole 41 of the push rod connecting plate 4, and then the push rod connecting plate 4 is locked, so that the movable push rod 3 is pressed against the pot teeth of the pot body 6 to prevent the pot cover 1 from rotating. When the food is cooked, the electric pressure cooker is powered off, and the food and the electric pressure cooker gradually cool down. When the steam temperature in the pot is lower than the preset temperature of the first magnet 53 and / or the second magnet 54, the magnetism of the first magnet 53 and / or the second magnet 54 is restored. At this time, the ability of the first magnet 53 and the second magnet 54 to attract each other is improved. The first magnet 53 and the second magnet 54 are attracted to each other to drive the stop rod 52 to fall back, and the stop rod 52 releases the lock on the push rod connecting plate 4. The user can open the lid and enjoy the food. Compared with the float valve in the existing electric pressure cooker, the safety locking structure of the pot cover 1 is automatically locked or unlocked according to the temperature in the pot. Since the preset temperature value is set as the safe temperature value for opening the lid (such as 60°C to 80°C), it is ensured that when the user opens the pot cover 1, only a small amount of steam is discharged, and the temperature is relatively low, which greatly reduces the risk of the user being scalded by the steam. In addition, the pressure condition in the pot does not affect the opening and closing of the pot cover 1. If some food expands after being cooked, causing the air pressure in the pot to increase, as long as the temperature in the pot meets the unlocking temperature of the safety locking structure of the pot cover 1, the pot cover 1 can still be opened and closed smoothly.

[0025] For details, see Figure 2As shown, the heat-conducting shell 51 includes a positioning platform 511 and a sleeve 512 arranged on the positioning platform 511; the sleeve 512 is provided with an external thread 513, and the sleeve 512 is fixed to the pot cover 1 through a nut 59 and the external thread 513. During actual assembly, a mounting hole 11 for mounting the heat-conducting shell 51 is provided on the pot cover 1, and the sleeve 512 extends into the mounting hole 11, and the positioning platform 511 is pressed against the inner wall of the pot cover 1, so that the positioning platform 511 faces the inner pot 7 in the electric pressure cooker. On the one hand, the positioning platform 511 can increase the contact area with steam and improve the thermal conductivity of the heat-conducting shell 51. On the other hand, the positioning platform 511 cooperates with the nut 59 to detachably fix the steam actuating mechanism 5 on the pot cover 1, which is convenient for product assembly.

[0026] Preferably, in order to improve the thermal conductivity of the heat-conducting shell 51, the heat-conducting shell 51 is an aluminum shell.

[0027] In order to ensure the airtightness of the cooking in the pot and prevent the steam from leaking through the gap between the sleeve 512 and the mounting hole 11, a sealing gasket 50 is provided between the nut 59 and the pot cover 1. Figure 2 shown.

[0028] In one embodiment, see Figure 4 As shown, the first magnet 53 has a first step 531, the second magnet 54 has a second step 541, the driving member 55 is a second spring, and the two ends of the second spring are respectively sleeved on the first magnet 53 and the second magnet 54, so that the second spring is located between the first step 531 and the second step 541. Through such an arrangement, the connection between the first magnet 53, the second magnet 54 and the second spring is compact and reliable.

[0029] See Figure 2 and Figure 4 As shown, the direction of the elastic force of the second spring is opposite to the direction of the stress of attraction between the first magnet 53 and the second magnet 54. When the steam temperature in the pot reaches a preset temperature value, the stress of attraction between the first magnet 53 and the second magnet 54 decreases sharply. At this time, the elastic force of the second spring is greater than the stress of attraction between the first magnet 53 and the second magnet 54, so that the elastic force can promote the separation of the first magnet 53 and the second magnet 54, and drive the stop rod 52 to move upward and insert into the locking hole 41 to achieve safe locking of the pot cover 1; when the steam temperature in the pot is lower than the preset temperature value, the stress of attraction between the first magnet 53 and the second magnet 54 is restored. At this time, the elastic force is less than the stress of attraction between the first magnet 53 and the second magnet 54, the first magnet 53 and the second magnet 54 are re-attracted, the stop rod 52 falls back, and the safe locking of the pot cover 1 is released.

[0030] Preferably, see Figure 2 and Figure 4As shown, the stop rod 52 includes a rod body 521 and a connecting portion 522, and the rod body 521 is fixedly connected to the second magnet 54 through the connecting portion 522. The rod body 521 and the connecting portion 522 are made by injection molding, and the connecting portion 522 of the stop rod 52 is connected to the second magnet 54 by overmolding, so that the second step 541 of the second magnet 54 is embedded in the connecting portion 522, so that the connecting portion 522 wraps the second step 541. The setting of this structure can ensure the reliability of the connection between the second magnet 54 and the stop rod 52. In addition, the connecting portion 522 is clearance-matched with the inner wall of the sleeve 512, so that the connecting portion 522 is slidably connected with the sleeve 512, ensuring that the vertical movement direction of the stop rod 52 is accurate and preventing the second magnet 54 from tilting. In actual assembly, one end of the second spring presses on the connecting portion 522, and the other end presses on the second magnet 54.

[0031] In order to prevent the driving member 55 from driving the stop rod 52 to separate from the heat-conducting shell 51, a fixing cover 56 is further provided on the free end of the sleeve 512, a clamping block 57 is provided on the side wall of the sleeve 512, a corresponding buckle hole 58 is provided on the fixing cover 56, and the fixing cover 56 and the sleeve 512 are buckled and connected through the buckle hole 58 and the clamping block 57, and a through hole 561 is provided on the top of the fixing cover 56 for the rod body 521 to pass through. When assembling, the fixing cover 56 can be directly pressed against the free end of the sleeve 512 to complete the connection, which is convenient and quick.

[0032] In one embodiment of the present invention, the first magnet 53 is a soft magnet, and the second magnet 54 is a hard magnet.

[0033] In this embodiment, the magnetism of the soft magnet can change with the change of temperature. Specifically, when the steam temperature in the pot reaches the preset temperature value of the soft magnet (i.e., the Curie temperature value), the magnetism of the soft magnet disappears, thereby sharply reducing the stress of attraction between the hard magnet and the soft magnet. Under the action of the driving member 55, the stop rod 52 separates the soft magnet and the hard magnet, and the rod body 521 of the stop rod 52 is inserted into the locking hole 41, so that the stop rod 52 is inserted into the locking hole 41 of the push rod connecting plate 4, thereby locking the push rod connecting plate 4, so that the movable push rod 3 is pressed against the pot teeth 61 of the pot body 6, preventing the pot cover 1 from rotating. When the steam temperature in the pot is lower than the preset temperature value of the soft magnet, the magnetism of the soft magnet is restored, so that the stress of the attraction between the hard magnet and the soft magnet is restored, and the hard magnet and the soft magnet overcome the force of the driving member 55 and re-attract, thereby driving the stop rod 52 to fall back, and the stop rod 52 releases the lock on the push rod connecting plate 4, and the user can open the lock cover at this time; the setting of this structure enables the safety locking structure of the pot cover 1 to automatically lock and release the pot cover 1 according to the steam temperature in the pot, which well replaces the float valve of the traditional electric pressure cooker, eliminates the shortcomings of the float valve, thereby improving the safety of the product and making it more humane. In addition, in the process of sensing the temperature in the cooking cavity, since the second magnet 54 is closely attached to the heat-conducting shell 51, the positioning platform 511 can directly transfer heat with the second magnet 54. Using the second magnet 54 as a soft magnet can improve the accuracy of the second magnet 54 in sensing the temperature in the pot, thereby improving the control accuracy of the lock cover safety locking structure to automatically lock the pot cover 1 according to the steam temperature of the inner pot. There is a thermal gap between the first magnet 53 and the thermal shell 51 , so under the premise of not affecting the performance of the product, a relatively low-cost hard magnet is selected as the first magnet 53 , which reduces the cost of the product without affecting the performance of the product.

[0034] See also Figure 1 and Figure 3 The second aspect of the present invention provides an electric pressure cooker, comprising: a pot cover 1, a pot cover 2, a pot body 6, and an inner pot 7; the pot teeth on the pot cover 1 are rotatably engaged with the pot teeth 61 on the pot body 6, the inner pot 7 is arranged in the pot body 6, a sealing ring is arranged between the pot cover 1 and the inner pot 7, the pot cover 2 is arranged on the upper surface of the pot cover 1, and the pot cover 1 safety locking structure described in any of the above embodiments is arranged between the pot cover 2 and the pot cover 1. The pot cover 2 is provided with a handle 8.

[0035] The electric pressure cooker provided by the embodiment of the second aspect of the present invention has a pot cover 1 provided with the pot cover 1 safety locking structure provided by the embodiment of the first aspect of the present invention. When the electric pressure cooker is cooking, the steam in the pot transfers heat to the first magnet 53 and the second magnet 54 through the heat-conducting shell 51, and the first magnet 53 and / or the second magnet 54 are demagnetized by heat. The driving member 55 drives the first magnet 53 and the second magnet 54 to separate, thereby driving the stop rod 52 to move upward, so that the stop rod 52 is inserted into the locking hole 41 of the push rod connecting plate 4, and then the push rod connecting plate 4 is locked, so that the movable push rod 3 is pressed against the pot teeth 61 of the pot body 6, thereby preventing the pot cover 1 from rotating. When the food is cooked, the electric pressure cooker is powered off, the food and the electric pressure cooker are gradually cooled down, the magnetism of the first magnet 53 and / or the second magnet 54 is restored, and the first magnet 53 and the second magnet 54 are attracted to each other to drive the stop rod 52 to fall back, and the stop rod 52 releases the lock on the push rod connecting plate 4, thereby automatically locking or unlocking the pot cover 1 according to the temperature in the pot, preventing the pressure in the pot from affecting the opening and closing of the electric pressure cooker.

[0036] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A pot cover safety locking structure, comprising a movable push rod arranged between the pot cover and the side of the pot cover, and a push rod connecting plate arranged between the pot cover and the pot cover; one end of the push rod connecting plate is fixedly connected to the movable push rod, and the other end of the push rod connecting plate is provided with a locking hole, the movable push rod is provided with a first spring, and the movable push rod can reciprocate horizontally along the radial direction of the pot cover; characterized in that: The pot cover is provided with a steam actuation mechanism, which comprises a heat-conducting shell fixed on the pot cover, a stop rod movable up and down arranged in the heat-conducting shell, a first magnet fixed on the heat-conducting shell, a second magnet fixed on the stop rod, and a driving member arranged between the first magnet and the second magnet; wherein the first magnet and / or the second magnet are soft magnets; the driving member can drive the first magnet to separate from the second magnet to drive the stop rod to insert into the locking hole; the heat-conducting shell comprises a positioning platform and a sleeve arranged on the positioning platform; the sleeve is provided with an external thread, and the sleeve is fixed to the pot cover through a nut and the external thread; a sealing gasket is arranged between the nut and the pot cover; the first magnet has a first step, and the second magnet has a second step, the driving member is a second spring, and the two ends of the second spring are respectively sleeved on the first magnet and the second magnet, so that the second spring is located between the first step and the second step; the stop rod comprises an integrally formed rod body and a connecting portion, the rod body is fixedly connected to the second magnet through the connecting portion, and the connecting portion wraps the second step.

2. The pot cover safety locking structure according to claim 1, characterized in that: A fixing cover is also provided on the free end of the sleeve, a clamping block is provided on the side wall of the sleeve, a corresponding buckle hole is opened on the fixing cover, the fixing cover and the sleeve are buckled and connected via the buckle hole and the clamping block, and a through hole is opened on the top of the fixing cover for the rod body to pass through.

3. The pot cover safety locking structure according to claim 1 or 2, characterized in that: The first magnet is a soft magnet, and the second magnet is a hard magnet.

4. An electric pressure cooker, characterized in that: include: A pot cover, a pot lid, a pot body, and an inner pot; the pot teeth on the pot cover are rotatably engaged with the pot teeth on the pot body, the inner pot is arranged in the pot body, a sealing ring is arranged between the pot cover and the inner pot, the pot cover is arranged on the upper surface of the pot cover, and a pot cover safety locking structure as claimed in claim 1 or 2 is arranged between the pot cover and the pot cover.

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