KR100262634B1 - Device for sensing unlocking and locking of lid in electrical pressure rice cooker - Google Patents

Abstract

PURPOSE: A locking/unlocking sensor of a lid for an electric autoclave is provided to promote regular locking and unlocking of a lid by adopting a lead switch for stopping a motor exactly at finish time point by a controller. CONSTITUTION: A motor(101) is assembled to an upper hot plate(8) of a lid(B) and exposed to an inner cover(7). The motor is connected with a rotor member(102). A rack(103) is formed around the rotor member. Plural pinions(104) are hinged with the upper hot plate and engaged with the rack to be rotated by the rotor member. Plural moving members(105) are mounted on the upper hot plate and moved horizontally by the pinions. A locking unit(106) is formed at the end of each moving member. The locking unit is hung to a protrusion(2a) of an oven or not depending on whether the moving members are moved horizontally to inside or outside. Each moving member has a magnet fixed thereto. A first and a second lead switch are set at the inner cover. Thereby, the first and the second lead switch are operated by a magnetic force of the magnets to stop the motor by a controller when the moving members are moved to a necessary distance.

Description

Lid Locking and Unlocking Sensing Device for Electric Pressure Cooker

The present invention relates to the field of electric pressure cooker, more specifically, when the cooking mode is selected with the lid closed, the lid is automatically locked to the main body, and when the cooking is finished, automatic locking of the main body of the lid It relates to a cap automatic locking device of the electric pressure cooker to release to.

In general, an electric pressure cooker is a device that uses electricity as a heating source and cooks while maintaining the inside at a constant pressure by the heat transfer, and is mainly composed of a main body A and a lid B that opens and closes the inside of the main body. It is.

The main body (A) has an outer case (1), an oven (2) having a locking jaw (2a) is fixed in the outer case to be bent outward to the upper end, and detachably built in the oven to accommodate the cooking The cooking container 3, the lower heating plate 4 installed directly below the oven 2 in the outer case 1 and supplying heat to the lower part of the oven, and the oven 2 in the outer case 1 It is installed in a state wrapped around the side is composed of a side heating plate (5) for supplying heat to the circumference of the oven.

In addition, the lid (B) is a top cover (6) rotatably hinged to the outer case (1) constituting the main body (A), the inner cover (7) fixed to the inside of the top cover, and the inner cover And an upper hot plate 8 for supplying heat to the upper portion of the oven 2 constituting the main body A, and an upper end portion exposed to the outside of the top cover 6, and a lower end portion exposed to the outside of the upper hot plate 8. It is fixed so that it consists of a steam discharge pipe (9) for discharging steam in the oven (2), and a pressure weight (10) installed on the upper end of the steam discharge pipe to selectively open and close the pipeline of the steam discharge pipe (9).

Therefore, in the state where the lid (B) is opened and the main body (A) is opened, the cooking container (3) in which the object to be heated is stored is stored in the oven (2) constituting the main body, and then the lid (B) is opened again. Close to close the inside of the main body (A).

The lid B is opened and closed in the above because the top cover 6 constituting the lid is hinged rotatably to the outer case 1 constituting the main body A.

In this state, when the user selects the cooking mode, the lower heating plate 4 constituting the main body A and the upper heating plate 8 constituting the lid B and the heat generating plate 8 generate heat, Since this heat transfer is transmitted to the oven 2 in the said main body A, cooking is carried out, as the to-be-heated object accommodated in the cooking container 3 is heated by heating of the said oven.

In this way, when cooking of the heated object is performed, the pressure inside the oven 2 continues to rise to generate steam. When the pressure inside the oven 2 reaches a predetermined pressure, the internal steam according to the remaining pressure is generated. The pressure weight 10 installed at the upper end of the steam discharge pipe 9 is slightly lifted and rotated at the same time by the discharge pressure of the steam discharge pipe 9, thereby opening the pipeline of the steam discharge pipe 9 and, accordingly, the steam caused by the pressure rise above the predetermined pressure is increased. It is discharged to the outside through the pipeline.

When the object to be heated is cooked through the above process and cooking is completed, a separate means (not shown) senses the power supply to each hot plate 4, 5, and 8 so that the oven 2 As no further heat is transferred, cooking is completed without further heating of the object to be heated.

As described above, the electric pressure cooker allows the lid (B) to be automatically locked to the main body (A) when the user selects the cooking mode for cooking and the cooking of the lid (B). It is equipped with a lid automatic locking device to automatically release the locking, which does not open the lid (B) even if the pressure inside the main body during the cooking process to enable pressure cooking and cooking Considering that the inside of the main body A is under high pressure, if the lid B is opened due to carelessness and other factors of the user, a safety accident such as burning of the user may occur due to the heat of the steam, thus preventing this. To do this.

The conventional lid automatic locking device of the electric pressure cooker is a motor 11 is attached to the upper cover 8 to the upper cover 8 constituting the lid (B) as shown in Figure 1 to 4 attached to the inner cover (7) The rotating member 12 is axially coupled to the motor to rotate in response to the driving force generated by the motor 11, and the radius of the narrowest part and the radius of the widest part are 45 ° at the edge of the lower surface of the rotating member, respectively. Cam 13 is formed to be continuous at intervals, the upper surface of the upper hot plate 8 is provided with a plurality of moving members 14 to move horizontally in and out under the rotational force of the rotating member 12, When the movable member is horizontally moved inward at the outer end of each of the movable members 14, the movable member 14 is caught by the locking jaw 2a of the oven 2 constituting the main body A, and the movable member 14 is horizontally outward. When moved, main unit (A) The locking piece 15 is formed so as not to be caught by the latching jaw 2a of the oven 2 constituting the oven, and each of the moving members 14 is provided with a protruding piece 16 and the inner cover 7. In the case that the moving member 14 is moved inward and outward by a predetermined distance, the first limit switch 17 and the second limit switch are stopped by the contact of the protruding pieces 16 to stop the driving of the motor 11 by the controller. The limit switch 18 is attached.

In the above, the movable member 14 is formed with a long hole 19 in the longitudinal direction in the middle portion of the respective movable member 14 so that the horizontal member is moved horizontally in and out under the rotational force of the rotary member 12 and the upper hot plate 8 The guide pin 20 is formed to be fitted into the long hole 19, and the cam pin 21 is fitted to the cam 13 formed on the rotating member 12 at the inner end of each of the movable members 14. It is fixed.

Therefore, until the user selects the cooking mode in the state in which the lid (B) is closed, each of the movable members 14 installed on the upper hot plate 8 so as to be movable in and out is horizontally moved outward. Since the locking piece 15 formed at the outer end of each moving member is not caught by the upper locking jaw 2a of the oven 2 constituting the main body A as shown in FIGS. 2A and 3, the lid B is eventually closed. It is in the state which is not locked to the main body A.

In this state, when the user selects the cooking mode, the motor 11 exposed to the inner cover 7 attached to the upper heating plate 8 constituting the lid B is driven by receiving the control signal of the controller. The combined rotating member 12 is rotated, and in this case, the guide pin 20 formed on the upper hot plate 8 is inserted into a long hole 19 formed in the longitudinal direction in the middle of each moving member 14, and the rotating member Considering that the cam pin 21 fixed to the inner end of each moving member 14 is fitted into the cam 13 formed on the 12, the cam pin is in the cam curve of the cam 13 formed on the rotating member 12. As guided toward the radius of the narrowest portion, each moving member 14 is horizontally moved inward by the rotational force of the rotating member 12.

In this way, when the inner horizontal movement of each moving member 14 horizontally moving inwardly is completed (the cam pin 21 fixed to the inner end of each moving member 14 is placed on the lower surface of the rotating member 12). Lever of the first limit switch 17 in which the projection pieces 16 formed on the respective moving members 14 are attached to the inner cover 7 at the moment when they are located at the narrowest radius of the cam curve of the formed cam 13. Since the operating contact 17b is pushed by touching 17a, the switching signal of the first limit switch is sent to the controller, and the controller stops driving the motor 11 immediately after receiving the signal. Since the locking piece 15 formed at the outer end of each of the movable members 14 is caught by the upper locking jaw 2a of the oven 2 constituting the main body A as shown in FIGS. 2B and 4, the lid ( B) is locked to the main body A.

In addition, when cooking is completed, the solenoid (not shown) operates to completely discharge the steam inside the main body A. When the pressure according to the discharge of the steam becomes less than a predetermined pressure, the motor 11 is driven again under the control signal of the controller. The rotating member 12 axially coupled to the motor also rotates under the driving force of the motor 11, and accordingly, each of the moving members 14 horizontally moved inward is horizontally moved outward again.

In this manner, the moment the outer horizontal movement of each of the movable members 14 moving horizontally outward is completed (the cam pin 21 fixed to the inner end of each movable member 14 is attached to the lower surface of the rotating member 12). The lever of the second limit switch 18 in which the protruding pieces 16 formed on each of the movable members 14 are attached to the inner cover 7 at the instant of being positioned at the widest radial part of the cam curve of the formed cam 13. Since the operation contact 18b is pushed by touching 18a, the switching signal of the second limit switch is sent to the controller, and the controller stops driving the motor 11 immediately after receiving the signal. Since the locking piece 15 formed at the outer end of each moving member 14 is not caught by the upper locking jaw 2a of the oven 2 constituting the main body A, the main body A of the lid B is eventually locked. Is released.

However, in the electric pressure cooker, when the lid is locked and unlocked, the conventional device for detecting the locking and unlocking state of the lid switches the completion timing of the lid locking and unlocking to stop the driving of the motor by the controller accurately. Since the limit switch is used as a switch to make the switch, there are the following problems.

First, the limit switch, which is a micro switch, is a switch in which a contact is interrupted by a mechanical operation. Although the operating contact is very small within 2 mm, the operating range can be increased by increasing the length of the lever touched while moving the moving object. If continuous touch force is provided or too forceful touch force is maintained, an error occurs in controlling the operation of the power generating member due to the bending position, and in this case, the locking and unlocking of the lid are made accurately. There was a risk of safety accident.

Second, the limit switch is limited to less than 85 ℃ Celsius because the elastic spring is an internal component is very weak to heat and humidity, the electric pressure cooker is cooked with the internal temperature rises to 130 ℃ by pressure Considering that a lot of water vapor is generated in this process, it is necessary to add a separate structure to block heat and moisture, thereby increasing manufacturing costs and design difficulties.

The present invention has been made in order to solve the above problems, a switch that detects the locking completion time and the unlocking completion time of the lid to stop the operation of the motor by the controller accurately while the electronic switch is very strong against heat and humidity By changing to, the locking and unlocking of the lid is made stable, thus preventing the occurrence of a safety accident by preventing the malfunction and preventing the use of a separate structure to protect the switch from heat and humidity. As there is no need to increase the manufacturing cost and design difficulties, the purpose is to solve.

According to an aspect of the present invention for achieving the above object, a rotating member that is rotated by the rotational force of the power generating member, a plurality of moving members reciprocating horizontally by the rotational movement of the rotating member, and the end of the moving member In the electric pressure cooker comprising a locking piece which is provided in the oven according to the moving direction of the moving member or the locking is released, the magnet provided in the moving member, and provided in place opposite to the magnet is provided with the magnet of the magnet And a controller for controlling driving of the power generating member according to an output waveform output when the first lead switch and the second lead switch are in an on state. Lid locking and unlocking state detection device of an electric pressure cooker is provided.

1 is a front view showing a part of the electric pressure cooker with a conventional lid locking and unlocking state detection device

Figure 2a is a plan view showing a portion of a conventional electric pressure cooker having a lid locking and unlocking state detection device, the state before the lid is locked

Figure 2b is a plan view showing a part of the electric pressure cooker having a conventional lid locking and unlocking state detection device, the state after the lid is locked

3 is a cross-sectional view taken along line II of FIG. 2A.

4 is a cross-sectional view taken along the line II-II of FIG. 2B.

Figure 5 is a plan view showing in detail the limit switch constituting the conventional lid locking and unlocking state detection device

Figure 6a is a plan view showing a part of the electric pressure cooker having a lid lock and unlocking state detection device of the present invention, the state before the lid is locked

Figure 6b is a plan view showing a part of the electric pressure cooker with a lid lock and unlocking state detection device of the present invention, the state after the lid is locked

FIG. 7 is a cross-sectional view of the main line III-III of FIG. 6A. FIG.

8 is a cross-sectional view taken along line IV-IV of FIG. 6B.

Figure 9a is an embodiment showing the relationship between the magnet and the first and second lead switch constituting the lid locking and unlocking state detection device of the present invention

Figure 9b is another embodiment showing the relationship between the magnet and the first and second lead switch constituting the lid locking and unlocking state detection device of the present invention

10A is a waveform diagram illustrating operating characteristics of a first lead switch and a second lead switch in the state of FIG. 9A.

FIG. 10B is a waveform diagram illustrating operation characteristics of the first lead switch and the second lead switch in the state of FIG. 9B.

FIG. 11A is a waveform diagram illustrating outputs of a first lead switch and a second lead switch in the FIG. 9A state; FIG.

FIG. 11B is a waveform diagram illustrating outputs of the first lead switch and the second lead switch in the FIG. 9B state; FIG.

Explanation of symbols for main parts of the drawings

101. Motor 102. Rotating member

103. Rack 104. Pinion

105. Moving member 106. Locking piece

107. Magnet 108. First lead switch

109. Second lead switch

Hereinafter, the present invention will be described in more detail with reference to the attached FIGS. 6 to 8 as an embodiment.

6A and 6B are a plan view showing a part of an electric pressure cooker having a lid locking and unlocking state detecting device according to the present invention, and FIG. 7 is a cross-sectional view of the main line of III-III of FIG. 6A, and FIG. 6-b is a cross-sectional view taken along the line IV-IV of the present invention, in which the motor 101 is attached to the upper hot plate 8 constituting the lid B so as to be exposed over the inner cover 7, and the motor 101 is mounted on the motor 101. The rotating member 102 is axially coupled to rotate by receiving the generated driving force, and a rack 103 is formed on the outer circumferential surface of the rotating member, and the upper hot plate is engaged with the rack 103 formed on the rotating member 102. The plurality of pinions 104 are hinged to rotate by receiving the rotational force of the rotating member 102 through the rack 103, and the upper hot plate 8 receives a rotational force of the pinion 104 to move horizontally in and outward. Two moving members 105, each of the moving members 105 At the end, in the state in which the movable member 105 is horizontally moved inward as the rotary member 102 is rotated, it is caught by the latching jaw 2a formed in the oven 2 and the movable member 105 is horizontally moved outward. The locking piece 106 is formed so as not to be caught by the latching jaw 2a formed in the oven 2, the magnet 107 is fixed to each of the moving members 105, and the moving member is placed in place of the inner cover 7. The first lead switch 108 and the second lead switch 109 are operated by the magnetic force of the magnet 107 to stop the driving of the motor 101 by the controller when the 105 is moved to the required distance inward and outward. Attach.

The first lead switch 108 and the second lead switch 109 are positioned in a direction perpendicular to the magnet 107 fixed to the moving member 105, respectively, so that the motor 101 can be accurately stopped by the controller. do.

On the other hand, in order to allow each movable member 105 to move horizontally inward and outward under the rotational force of the pinion 104, the first long hole 110 is formed in the middle of the respective movable members 105 in the longitudinal direction and the upper portion thereof. The guide plate 111 is formed in the hot plate 8 to be fitted into the first long holes 110 formed in the respective moving members 105, and the first long holes 110 and the inner end of each of the movable members 105 are formed. The second long hole 112 is formed in the direction perpendicular to the pinion 104, and the pinion 104 fixes the eccentric pin 113 to be fitted into the second long hole 112 formed in the respective moving members 105.

Referring to the operation of the present invention configured as described above is as follows.

Until the user selects the cooking mode with the lid (B) closed, the movable member 105 installed on the upper heating plate 8 to be horizontally movable left and right under the rotational force of each pinion 104 is horizontally outward. In this case, the locking piece 106 formed at the outer end of each moving member is caught on the upper locking jaw 2a of the oven 2 constituting the main body A as shown in FIGS. 6A and 7. As a result, the lid B is not locked to the main body A.

In this state, when the user selects the cooking mode, the motor 101 exposed to the inner cover 7 attached to the upper heating plate 8 constituting the lid B is driven under the control signal of the controller, and thus the shaft is mounted on the motor. The combined rotary member 102 is rotated and the rotational force is transmitted to each pinion 104 hinged to the upper hot plate 8 through the rack 103 formed on the outer circumferential surface of the rotating member so that each pinion rotates. At this time, the guide pin formed in the upper hot plate 8 as the first long hole 110 formed in the longitudinal direction in the middle of each of the movable members 105, which is horizontally movable in and outward on the upper hot plate 8 ( 111 is inserted into the second end hole 112 formed in a direction orthogonal to the first long hole 110 at the inner end of each of the moving member 105, the eccentric pin 113 is fixed to the pinion (104) ) Is inserted into each of the movable member 105 to each pinion ( Receive the rotational force of 104 and move horizontally inward.

In this manner, the moment when the inner horizontal movement of each of the movable members 14 horizontally moved inwardly is completed (the moment when the eccentric pin 113 fixed to the respective movable members 105 is positioned at the innermost side), the respective movable members 105 The magnet 107 is fixed to the center is located in the center of the first lead switch 108 attached to the inner cover (7), in which case the first lead switch 108 is perpendicular to the magnet 107 In consideration of being located in the direction, the first lead switch 108 is temporarily turned off, and the controller senses this time point to stop the driving of the motor 101.

On the other hand, in the state that the inner horizontal movement of each moving member 105 by the above action is completed, the locking piece 106 formed on the outer end of each moving member 105 is the main body (A) as shown in Figs. Since the upper locking jaw (2a) of the constituent oven 2 is caught, the lid (B) is eventually locked to the main body (A) so that the lid (B) does not open even when the pressure rises during cooking.

In addition, when cooking is completed, the solenoid (not shown) operates to completely discharge the steam inside the main body A. When the pressure according to the discharge of the steam becomes less than a predetermined pressure, the motor 101 is driven again by receiving a control signal from the controller. The rotating member 102 axially coupled to the motor also rotates under the driving force of the motor 101, and at the same time, each pinion 104 rotates under the rotational force of the rotating member, thereby moving each of the moving members (horizontally moved inwards). 105) moves horizontally outward again.

In this manner, the moment when the horizontal movement of the outside of each moving member 105 is completed (the moment when the eccentric pin 113 fixed to each moving member 105 is located at the outermost side), the magnet fixed to each of the moving members 105 Since the second lead switch 107 is located at the center of the second lead switch 109 attached to the inner cover 7, the second lead switch is momentarily turned off, and the controller senses this point to drive the motor 101. In this case, the locking piece 106 formed at the outer end of each moving member 105 is not caught by the upper locking jaw 2a of the oven 2 constituting the main body A. Of the main body A is released.

Then, as the first lead switch 108 and the second lead switch 109 are positioned at right angles with the magnet 107 fixed to the moving member 105 as shown in FIG. 9A, the magnet is first and second leads. When the controller detects a signal when it is located at the center of the switch 108, 109 and stops the driving of the motor 101 in more detail, it will be described below.

When the moving member 105 is moved horizontally, the magnet 107 fixed to the moving member is gradually approached to the first lead switch 108 and the second lead switch 109 which are a kind of sensor. The two-lead switch 108 and 109 exhibit an operating waveform as shown in FIG. 10A as the magnet 107 approaches.

That is, while the magnet 107 is in proximity to the first and second lead switches 108 and 109, the first and second lead switches are in an off state and turned on from the moment when the magnetic force of the magnet 107 is applied to either side. Then the magnetic force of the magnet 107 is equally applied to both poles of each of the reed switches 108 and 109 at any moment when the magnet is located at the center of each of the reed switches 108 and 109. In the first and second lead switches, an output waveform that is turned off momentarily is shown as shown in FIG. 11A, and the controller reads a time point at which the output waveform is turned off again in an on state among the output waveforms to control the driving of the motor 101. Is done correctly.

Meanwhile, in the present invention, the first and second lead switches 108 and 109 attached to the inner cover 7 are not positioned at right angles with the magnet 107 fixed to the moving member 105, and are vertical as shown in FIG. 9B. Even if they are positioned side by side in the same state, there is no big problem. However, when the first and second lead switches 108 and 109 are positioned in this way, the magnets 107 are first and second in accordance with the movement of the movable member 105. When the proximity to the reed switch 108, 109 shows the operating waveform as shown in Figure 10b, in this case, while the magnet 107 is close to the first and second lead switch 108, 109, the 1.2 lead switch Is in the off state, and while the magnetic force of the magnet 107 throws at any point, the first and second lead switches 108 and 109 continuously display their output waveforms as shown in FIG. The controller reads the moment the on of the output waveform starts, and then Since the driving of the motor 101 is controlled after the time is not the stop of the motor is often not made exactly.

Therefore, when the lid B is locked or unlocked in accordance with the movement of the movable member 105 among the components of the present invention, the first and second lead switches 108 for stopping the driving of the motor 101 at that time. 109 is preferably attached to be positioned in a direction perpendicular to the magnet 107 fixed to the moving member 105 as shown in Figure 9a.

As described above, according to the present invention, first, when the rotating member rotates according to the driving of the motor, each moving member receives the rotational force of the rotating member through the pinion and horizontally moves the lid to lock the lid to the main body or lock the main body of the lid. Since the number of the movable member can be increased to several as necessary, the locking of the lid is more perfect when cooking, and thus the safety is secured. Second, the rotational force of the rotating member rotated by the driving force of the motor Since the pinion, which is an intermediate medium, is transmitted to each moving member, the pinion can increase the torque even when the torque of the motor is small, especially considering that the pressure inside the main body maintains a constant pressure when the lid is unlocked. Therefore, the movement of each moving member is made smoothly and using the motor of the small torque As a result, manufacturing cost is reduced and assembly performance is improved.The switch that stops the motor by detecting the completion state of the moving member is a reed switch that is resistant to moisture and has low thermal strain, so that switching malfunction does not occur when used for a long time. There is.

Claims (3)

A rotating member that is rotated by the rotational force of the power generating member, a plurality of moving members that reciprocate horizontally by the rotational movement of the rotating member, and are provided at the end of the moving member and placed in an oven according to the moving direction of the moving member. In the electric pressure cooker consisting of a locking piece that is caught or released is, the magnet provided in the moving member, A first lead switch and a second lead switch provided at a position opposite to the magnet and turned on while the magnet of the magnet is applied; Lid locking and unlocking state sensing device of the electric pressure cooker, characterized in that the controller configured to control the driving of the power generating member according to the output waveform output when the first and second lead switch is in the on state . The method of claim 1, A lid automatic locking device of an electric pressure cooker, characterized in that the first lead switch and the second lead switch is located in a direction perpendicular to the magnet. The method of claim 1, A lid automatic locking device for an electric pressure cooker, characterized in that the first lead switch and the second lead switch is located in the same direction as the magnet.