Door interlock assembly and cooking device equipped with the door interlock assembly

Abstract

A door interlock assembly and cooking equipment, a second micro switch, a pull rod and a first micro switch are sequentially installed on a bracket from top to bottom, the pull rod moves inward to trigger the first micro switch and the second micro switch, and the pull rod has a tendency to reset outward under the action of a first elastic member, characterized in that: an active rod and a limit rod are also installed on the bracket, the active rod moves inward to drive the limit rod to release the limit on the pull rod and make the pull rod move inward, the active rod maintains a tendency to reset outward under the action of the second elastic member, and the limit rod maintains a tendency to move in the opposite direction under the action of a third elastic member. The door interlock assembly of the cooking equipment uses the structure of the limit rod to control the movement of the pull rod, only when the active rod moves to the innermost position, the pull rod can move inward and the micro switch can be closed, thereby improving the safety of use, and in the process of closing the door assembly, the door body first squeezes the active rod and then squeezes the pull rod, and there is no need to add structure to the door assembly.

Description

Technical Field

[0001] The invention relates to cooking equipment, in particular to a door interlocking assembly and cooking equipment equipped with the door interlocking assembly. Background Art

[0002] In existing kitchen appliances such as microwave ovens, electric steamers and electric ovens, the door opening method is generally designed to be a sliding door, and for this door opening method, there are corresponding door interlock components. The existing conventional door interlock components generally include a door body and a box front plate that matches the door body, a door hook is installed on the door body, a door interlock bracket is installed on the box front plate, and a micro switch triggered by the door hook is installed on the door interlock bracket. For example, the "Universal Microwave Oven Door Interlocking Mechanism" disclosed in the Chinese utility model patent with patent number ZL 201020545967.5 (authorization announcement number CN201925981U) includes a switch seat, a door hook and a front plate. Multiple switches can be placed on the switch seat, and an action key for operating the switch is provided at the position corresponding to each switch. The door hook is provided on the oven door of the microwave oven and is combined with or disengaged from the switch seat as the oven door is opened or closed. The door hook has at least one hook portion for triggering the switches by touching the action keys, and the front plate is used to fix the switch seat on the cavity of the microwave oven.

[0003] The door interlock of existing cooking equipment with microwave function is connected by squeezing the convex ribs on the door assembly. Since the microwave function can be activated after the interlock assembly is connected, there is a situation where the user accidentally activates the microwave. Since microwaves are very harmful to the human body, this interlock connection method has such a risk. In addition, due to the requirements of safety regulations, when the product closes the door and prepares to start working, the first high-voltage switch must be connected first, and then the second high-voltage switch; when the product is cooked and the user opens the door, the second high-voltage switch must be disconnected first, and then the first high-voltage switch must be disconnected. Otherwise, if the order of the two high-voltage switches is wrong, the product will automatically start the protection program and blow up the fuse on the electric control panel to prevent the product from working. At the same time, for products with microwave functions, according to safety regulations, there must be at least one high-voltage switch that cannot be touched by fingers. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a door interlock assembly with a simple structure and high safety performance in view of the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a cooking device with a simple door assembly structure and high safety performance in view of the above-mentioned existing technical status.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the door interlock assembly includes a bracket, on which a second microswitch, a pull rod and a first microswitch are installed in sequence from top to bottom, the pull rod can trigger the first microswitch and the second microswitch when it moves inward, and the pull rod has a tendency to reset outward after moving inward under the action of the first elastic member, and is characterized in that: an active rod and a limit rod are also installed on the bracket, the active rod is located below the first microswitch, the active rod can drive the limit rod to release the limit on the pull rod when it moves inward and make the pull rod move inward, the active rod moving inward maintains a tendency to reset outward under the action of the second elastic member, and the limit rod moving under the drive of the active rod maintains a tendency to move in the opposite direction under the action of the third elastic member.

[0007] In order to ensure that the first microswitch and the second microswitch can be closed and opened sequentially, a first contact is provided at the top of the first microswitch, a second contact is provided at the bottom of the second microswitch, a first touch block for triggering the first contact is provided at the bottom of the pull rod, and a second touch block for triggering the second contact is provided at the top of the pull rod, and the pull rod triggers the first microswitch and the second microswitch in sequence during the inward movement, and disconnects the second microswitch and the first microswitch in sequence during the outward resetting process.

[0008] The first elastic member can have a variety of structures. Preferably, the bracket is provided with a horizontally distributed first mounting column, the pull rod is provided with a second mounting column corresponding to the first mounting column, the first elastic member is a first spring, the inner end of the first spring is sleeved on the first mounting column, and the outer end of the first spring is sleeved on the second mounting column. In this way, after the pull rod moves inward, the first spring is compressed, thereby exerting an outward elastic force on the pull rod, thereby keeping the pull rod with a tendency to return outward.

[0009] In order to make the pull rod move more smoothly, a guide block for guiding the movement of the pull rod is provided on the bracket.

[0010] The second elastic member can have a variety of installation structures. Preferably, the outer end of the active rod has a limiting protrusion, the bracket is provided with a fixing plate, the active rod passes through the fixing plate and the limiting protrusion is located on the outer side of the fixing plate, the second elastic member is a second spring sleeved on the active rod, the outer end of the second spring abuts against the limiting protrusion, the inner end of the second spring abuts against the fixing plate, the active rod extends outward from the bracket in the outward reset state, and the limiting protrusion is arranged in the bracket. In this way, after the active rod moves inward, the second spring is compressed, thereby exerting an outward elastic force on the active rod, thereby keeping the active rod with a tendency to reset outward.

[0011] In order to make the active rod move more smoothly, a support block for supporting the active rod is installed on the bracket, and the support block is located on the inner side of the fixing plate.

[0012] The third elastic member can have a variety of installation structures. Preferably, a fixing frame for accommodating the limit rod is installed on the bracket, and the third elastic member is a third spring installed in the fixing frame. The upper end of the third spring abuts against the limit rod, and the lower end of the third spring abuts against the fixing frame. In this way, after the limit rod moves downward, the third spring is compressed, thereby exerting an upward elastic force on the limit rod, thereby keeping the limit rod with a tendency to reset upward.

[0013] In order to enable the active rod to drive the limit rod to move downward during its inward movement, a guide surface inclined outward from top to bottom is formed on the outer side surface of the limit rod, and a limit groove connected with the guide surface is also formed on the limit rod. The limit groove is located above the guide surface. When the active rod is reset outward, the limit rod is in the highest position and the guide surface corresponds to the inner end of the active rod. When the active rod is inward to the bottom, the limit rod is in the lowest position and the active rod is locked in the limit groove.

[0014] In order to release the limit on the pull rod after the limit rod moves downward, a step is formed on the top of the limit rod. When the limit rod is in the highest position, the inner end of the pull rod abuts against the outer side wall of the limit rod. When the limit rod is in the lowest position, the inner end of the pull rod extends inwardly onto the step.

[0015] In order to position the first micro switch and the second micro switch on the bracket, a positioning column is provided on the bracket, and the first micro switch and the second micro switch are installed on the corresponding positioning column.

[0016] Further preferably, the pull rod and the active rod are both arranged horizontally, and the limit rod is arranged vertically and is located inside the pull rod and the active rod. In this way, the pull rod and the active rod both maintain horizontal movement, and the limit rod maintains vertical movement.

[0017] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: the cooking device equipped with a door interlock assembly comprises an inner pot, a front plate is installed on the front side of the inner pot, and a door assembly is installed on the front plate, and is characterized in that: the bracket of the door interlock assembly is installed on the outer wall of the inner pot, and a socket corresponding to the pull rod is opened on the front plate, the front end portion of the active rod extends forward from the front plate, and the protruding portion of the active rod is located below the socket, and a convex column is provided on the inner side wall of the door assembly. In the process of the door assembly closing upward, the inner side wall of the door assembly first presses the active rod to move the active rod inward, and then the convex column is inserted into the socket and presses the pull rod to move the pull rod inward.

[0018] Compared with the prior art, the advantages of the present invention are: the active rod of the door interlock assembly of the cooking equipment moves inward to drive the limit rod to move, and then the limit rod releases the limit on the pull rod to allow the pull rod to move inward, that is, the structure of the limit rod is used to control the movement of the pull rod. Only when the active rod moves to the innermost position can the pull rod move inward and the micro switch can be closed, thereby improving the safety of users using the machine. The active rod is located below the pull rod. During the closing process of the door assembly, the door body first squeezes the active rod and then squeezes the pull rod. There is no need to add structure to the door assembly, making the door body structure simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a door interlock assembly according to an embodiment of the present invention;

[0020] Figure 2 It is a partial structural schematic diagram of a cooking device according to an embodiment of the present invention with the door open;

[0021] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0022] Figure 4 It is a partial structural schematic diagram of a cooking device according to an embodiment of the present invention when the door is closed;

[0023] Figure 5 for Figure 4 A magnified schematic diagram of part B;

[0024] Figure 6 A schematic diagram of the structure of a pull rod according to an embodiment of the present invention;

[0025] Figure 7 A schematic structural diagram of an active rod according to an embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the structure of a limit rod according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 5 As shown, the door interlock assembly of this embodiment includes a bracket 1, a positioning column 16 is provided on the bracket 1, a first micro switch 2 and a second micro switch 3 are installed on the corresponding positioning column 16, the first micro switch 2 is a first high-voltage switch, and the second micro switch 3 is a second high-voltage switch. Figure 1 The direction indicated by the middle arrow C is the forward direction, and the first micro switch 2 is located in front of and below the second micro switch 3. A first contact 21 is provided at the top of the first micro switch 2, and a second contact 31 is provided at the bottom of the second micro switch 3.

[0029] A horizontally distributed pull rod 4 that can move forward and backward is also installed on the bracket 1, and a guide block 12 for guiding the movement of the pull rod 4 is installed on the bracket 1. The pull rod 4 is located between the first micro switch 2 and the second micro switch 3. Figure 6 As shown, the bottom of the pull rod 4 is provided with a first bumper 41 for triggering the first contact 21, and the top of the pull rod 4 is provided with a second bumper 42 for triggering the second contact 31. The pull rod 4 sequentially triggers the first micro switch 2 and the second micro switch 3 during the inward (i.e. backward) movement, and sequentially disconnects the second micro switch 3 and the first micro switch 2 during the outward (i.e. forward) reset.

[0030] In this embodiment, a first mounting column 11 is provided on the bracket 1. Figure 6 As shown, a second mounting post 43 corresponding to the first mounting post 11 is provided on the pull rod 4, the first spring 7 constitutes a first elastic member, the inner end (i.e., the rear end) of the first spring 7 is sleeved on the first mounting post 11, and the outer end (i.e., the front end) of the first spring 7 is sleeved on the second mounting post 43. After the pull rod 4 moves inward, the first spring 7 is compressed, so that the pull rod 4 has a tendency to return outward.

[0031] The bracket 1 is provided with an active rod 5 which is horizontally distributed and can move forward and backward. The bracket 1 is provided with a fixing plate 13 and a support block 14. The support block 14 is located on the inner side (i.e., the rear side) of the fixing plate 13. The fixing plate 13 is provided with a through hole for the active rod 5 to pass through. The fixing plate 13 and the support block 14 both support and guide the active rod 5 so that the active rod 5 can move smoothly. Figure 7 As shown, the outer end of the active rod 5 has a limiting protrusion 51, and the limiting protrusion 51 is located on the outer side (i.e., the front side) of the fixing plate 13. The second spring 8 constitutes a second elastic member, and the second spring 8 is sleeved on the active rod 5. The outer end of the second spring 8 abuts against the limiting protrusion 51, and the inner end of the second spring 8 abuts against the fixing plate 13. The front end of the active rod 5, i.e., the front part of the front side of the limiting protrusion 51, forms a protruding portion 52, and the front end of the protruding portion 52 forms an active rod sleeve 53. When the active rod 5 is in the outward reset state, the protruding portion 52 protrudes outward from the bracket 1, and the limiting protrusion 51 is arranged in the bracket 1.

[0032] A fixing frame 15 is mounted on the bracket 1, and a limiting rod 6 and a third spring 9 are mounted in the fixing frame 15. The third spring 9 constitutes a third elastic member, and the upper end of the third spring 9 abuts against the limiting rod 6, and the lower end of the third spring 9 abuts against the fixing frame 15. When the limiting rod 6 moves downward, the third spring 9 is compressed, and under the elastic force of the third spring 9, the limiting rod 6 maintains a tendency to return upward.

[0033] like Figure 8As shown, the outer side of the limit rod 6 is formed with a guide surface 61 that is inclined from top to bottom and outward, and the limit rod 6 is also formed with a limit groove 62 that is connected to the guide surface. The limit groove 62 is located above the guide surface 61, and a step 63 is formed on the top of the limit rod 6. Figure 1 As shown, when the active rod 5 is reset outward, the active rod 5 is completely moved to the outside of the limit rod 6, the limit rod 6 is at the highest position and the guide surface 61 corresponds to the inner end of the active rod 5, the inner end of the pull rod 4 abuts against the outer side wall of the limit rod 6, and the limit rod 6 prevents the pull rod 4 from moving inward. Figure 5 As shown, when the active rod 5 is inwardly extended to the bottom, the limit rod 6 is in the lowest position and the active rod 5 is locked in the limit groove 62, and the pull rod corresponds to the step 63 of the limit rod 6. Under the action of external force, the pull rod 4 moves inward, and the inner end of the pull rod 4 extends inward onto the step 63. At this time, the first spring 7, the second spring 8 and the third spring 9 are all in a compressed state.

[0034] The cooking device of this embodiment is a cooking device with microwave function, such as a microwave oven, a steam-microwave all-in-one machine, a steam-bake-microwave all-in-one machine, etc., which includes an inner pot 100, a front plate 101 is installed on the front side of the inner pot, a door assembly 102 is installed on the front plate 101, a bracket 1 of the door interlock assembly is installed on the right outer side wall of the inner pot 100, a plug hole 103 corresponding to the pull rod 4 is opened on the front plate 101, and the extension part 52 of the active rod 5 extends forward from the front plate 10, and the extension part 52 is located below the plug hole 103. A convex column 104 matching with the pull rod 4 is provided on the inner side wall of the door assembly 102.

[0035] The action process of the door interlock structure is as follows:

[0036] When closing the door, first, the inner side wall of the door assembly 102 first presses the active rod sleeve 53 to make the active rod 5 move inward, and the inward movement of the active rod 5 drives the limit rod 6 to move downward. After the limit rod 6 moves downward, until the active rod 5 is limited in the limit groove 62 of the limit rod 6, at this time, the limit rod 6 releases the limit on the pull rod 4, so that during the further closing of the door, the convex column 104 of the door assembly 102 can be smoothly inserted into the insertion hole 103 and press the pull rod 4 inward, driving the pull rod 4 to move inward. During the inward movement of the pull rod 4, the first micro switch 2 and the second micro switch 3 are triggered and closed successively, meeting the safety requirements.

[0037] When opening the door, first, under the action of the first spring 7, the pull rod 4 is reset forward; then, under the action of the second spring 8, the active rod 5 is reset forward until the active rod 5 moves completely to the outside of the limit rod 6; finally, under the action of the third spring 9, the limit rod 6 is reset upward to prevent the pull rod 4 from moving inward. In addition, during the process of the pull rod 4 being reset forward, the second micro switch 3 and the first micro switch 2 are disconnected successively.

Claims

1. A door interlock assembly, comprising a bracket (1), on which a second micro switch (3), a pull rod (4) and a first micro switch (2) are sequentially mounted from top to bottom, wherein the pull rod (4) can sequentially trigger the first micro switch (2) and the second micro switch (3) when it moves inward, and the pull rod (4) has a tendency to return outward under the action of a first elastic member after moving inward, and is characterized in that: An active rod (5) and a limit rod (6) are also mounted on the bracket (1). The active rod (5) is located below the first micro switch (2). The inward movement of the active rod (5) can drive the limit rod (6) to release the limit on the pull rod (4) and make the pull rod (4) move inward. The active rod (5) moving inward has a tendency to return outward under the action of the second elastic member. The limit rod (6) moving under the action of the active rod (5) has a tendency to return in the opposite direction under the action of the third elastic member. In order to adjust the movement trend, the pull rod (4) and the active rod (5) are both arranged horizontally, the limit rod (6) is arranged vertically and is located on the inner side of the pull rod (4) and the active rod (5), the outer side surface of the limit rod (6) is formed with a guide surface (61) inclined outward from top to bottom, and a limit groove (62) connected with the guide surface is also formed on the limit rod (6), the limit groove (62) is located above the guide surface (61), and a step (63) is formed on the top of the limit rod (6).

2. The door interlock assembly according to claim 1, characterized in that: The first microswitch (2) is provided with a first contact (21) at the top, the second microswitch (3) is provided with a second contact (31) at the bottom, the pull rod (4) is provided with a first contact block (41) for triggering the first contact at the bottom, and the pull rod (4) is provided with a second contact block (42) for triggering the second contact at the top, and the pull rod (4) sequentially triggers the first microswitch (2) and the second microswitch (3) during the process of moving inward, and sequentially disconnects the second microswitch (3) and the first microswitch (2) during the process of resetting outward.

3. The door interlock assembly according to claim 1, characterized in that: A first mounting column (11) is horizontally arranged on the bracket (1), a second mounting column (43) corresponding to the first mounting column is arranged on the pull rod (4), the first elastic member is a first spring (7), the inner end of the first spring (7) is sleeved on the first mounting column (11), and the outer end of the first spring (7) is sleeved on the second mounting column (43).

4. The door interlock assembly according to claim 1, characterized in that: A guide block (12) for guiding the movement of the pull rod (4) is provided on the bracket (1).

5. The door interlock assembly according to claim 1, characterized in that: The outer end of the active rod (5) has a limiting protrusion (51); a fixing plate (13) is provided on the bracket (1); the active rod (5) passes through the fixing plate (13) and the limiting protrusion (51) is located outside the fixing plate (13); the second elastic member is a second spring (8) sleeved on the active rod (5); the outer end of the second spring (8) abuts against the limiting protrusion (51); the inner end of the second spring (8) abuts against the fixing plate (13); the active rod (5) extends outward from the bracket (1) in an outward resetting state and the limiting protrusion (51) is arranged inside the bracket (1).

6. The door interlock assembly according to claim 5, characterized in that: A support block (14) for supporting the active rod (5) is installed on the bracket (1), and the support block (14) is located on the inner side of the fixing plate (13).

7. The door interlock assembly according to claim 1, characterized in that: A fixing frame (15) for accommodating a limiting rod (6) is installed on the bracket (1); the third elastic member is a third spring (9) installed in the fixing frame (15); the upper end of the third spring (9) abuts against the limiting rod (6); and the lower end of the third spring (9) abuts against the fixing frame (15).

8. The door interlock assembly according to claim 7, characterized in that: When the active rod (5) is in the outward reset state, the limit rod (6) is in the highest position and the guide surface (61) corresponds to the inner end of the active rod (5); when the active rod (5) is in the inward reset state, the limit rod (6) is in the lowest position and the active rod (5) is locked in the limit groove (62).

9. The door interlock assembly according to claim 8, characterized in that: When the limiting rod (6) is in the highest position, the inner end of the pull rod (4) abuts against the outer side wall of the limiting rod (6); when the limiting rod (6) is in the lowest position, the inner end of the pull rod (4) extends inwardly onto the step (63).

10. The door interlock assembly according to claim 1, characterized in that: A positioning column (16) is provided on the bracket (1), and the first micro switch (2) and the second micro switch (3) are mounted on the corresponding positioning column (16).

11. A cooking device equipped with the door interlock assembly according to any one of claims 1 to 10, comprising an inner pot (100), a front plate (101) being installed on the front side of the inner pot, and a door assembly (102) being installed on the front plate, characterized in that: The bracket (1) of the door interlock assembly is installed on the outer wall of the inner liner (100), and a socket (103) corresponding to the pull rod (4) is opened on the front plate (101). The front end of the active rod (5) extends forward from the front plate (101), and the protruding portion (52) of the active rod (5) is located below the socket (103). A convex column (104) is provided on the inner wall of the door assembly (102). When the door assembly (102) is closed upward, the inner wall of the door assembly (102) first presses the active rod (5) to move the active rod inward, and then the convex column (104) is inserted into the socket (103) and presses the pull rod (4) to move the pull rod (4) inward.

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