A door lock for a domestic appliance

Abstract

The utility model provides a kind of household appliance door lock, be provided with bolt, locking portion and spacing assembly, locking portion includes shell, engaging piece, first displacement piece, second displacement piece, first elastic member and second elastic member, engaging piece is connected with first displacement piece, second displacement piece is slidably connected with shell inner wall, first displacement piece is slidably connected with second displacement piece, first elastic member is arranged between first displacement piece and second displacement piece and two ends respectively abut first displacement piece and second displacement piece, second elastic member is arranged inside shell and is connected with second displacement piece, so that second displacement piece always has the tendency of being retracted into gap, spacing assembly includes electromagnetic relay, passes and is equipped with block, spring and limit block. When power off, pull cabinet door in outside, bolt drives engaging piece, first displacement piece and second displacement piece overcome the force of second elastic member and move outward, thus, realize normal state can open and close door and meet the demand of needing to open door under emergency state.

Description

Technical Field

[0001] This utility model relates to the field of household appliances, and in particular to a door lock for household appliances. Background Technology

[0002] Some household appliances typically have an appliance body, such as a dishwasher, within which a product handling chamber is formed. A door is mounted on the appliance body to pivot about a horizontal axis; the door is used to close the entry opening to the product handling chamber. During operation of the appliance, the door should be securely locked to prevent products being processed within the chamber from escaping from the machine and potentially endangering people standing nearby. Therefore, a door lock is usually provided to keep the door closed.

[0003] For example, patent CN119791546A provides an automatic locking and unlocking device, including a bolt, a lock housing, a telescopic assembly, and a locking assembly. The lock housing has a notch, and the telescopic assembly is located inside the locking housing. It has a telescopic end that can extend or retract relative to the notch. The locking assembly includes a locking housing, a limiting member, and two bolt arms that can move relative to each other. The locking housing is connected to the telescopic end, one end of each bolt arm is hinged to the locking housing, and both ends of the limiting member are connected to the other ends of the bolt arms to restrict their opposite movement. When unlocking is required, the telescopic assembly pushes the locking assembly out of the lock housing, and the bolt moves relative to the lock housing under the action of the locking assembly, thus unlocking. When locking is required, the bolt is manually pushed into the locking assembly, which is currently outside the lock housing. The telescopic assembly pulls the locking assembly and the bolt back into the lock housing, thereby completing the locking action.

[0004] The above-mentioned automatic switch locking device has the following problem: when the power is off, the telescopic component is not powered and cannot be unlocked. Utility Model Content

[0005] In view of this, it is necessary to provide a door lock for household appliances that can meet the unlocking needs in the event of a power outage.

[0006] This utility model provides a door lock for household appliances, including: bolt, The locking part includes a housing, a locking member, a first displacement member, a second displacement member, a first elastic member, and a second elastic member. The housing has a notch communicating with its interior. The locking member is connected to the first displacement member. The second displacement member is slidably connected to the inner wall of the housing. The first displacement member and the second displacement member are slidably connected. The first elastic member is located between the first and second displacement members, with its two ends abutting against the first and second displacement members respectively. The second elastic member is located inside the housing and connected to the second displacement member, so that the second displacement member always tends to retract relative to the notch. The limiting component includes an electromagnetic relay, a through block, a spring, and a limiting block. The electromagnetic relay is fixed inside the housing and has a telescopic end. The through block is fixed on the telescopic end of the electromagnet. The spring is sleeved on the telescopic end and its two ends abut against the electromagnetic relay and the through block, respectively. The limiting block is rotatably mounted on the second displacement member. One end of the limiting block forms a snap-fit ​​end, and the other end passes through the through block along the sliding direction of the second displacement member. When the telescopic end is extended to its maximum state and the first displacement member moves relative to the second displacement member to be close to the limiting block, the snap-fit ​​end snaps into the first displacement member. When the telescopic end is retracted to its minimum state, the snap-fit ​​end disengages from the first displacement member.

[0007] In other embodiments, a protrusion corresponding to the limiting block is formed on the side of the first displacement member near the limiting block, the side of the protrusion away from the door bolt is bent towards the door bolt to form an arc surface, and the side of the protrusion facing the door bolt forms a snap-fit ​​surface perpendicular to the sliding direction of the first displacement member.

[0008] In other embodiments, the second displacement member is strip-shaped, with its bottom surface slidably connected to the interior of the housing and its top surface slidably contacting the first displacement member.

[0009] In other embodiments, the top surface of the second displacement member is provided with a plurality of pairs of opposing limiting plates, and the spacing between each pair of limiting plates matches the width of the first displacement member.

[0010] In other embodiments, the drive assembly includes a torsion spring, a sector gear, and a rack. The rack is fixed to one side of the second displacement member. The sector gear is rotatably connected to the inner wall of the housing and meshes with the rack. One end of the torsion spring is fixed to the inner wall of the housing, and the other end is fixed to the sector gear. The torsion spring applies a force to the sector gear to cause the sector gear to rotate and the teeth of the sector gear to face away from the notch.

[0011] In other embodiments, the housing includes an upper snap-fit ​​body and a lower snap-fit ​​body, the upper snap-fit ​​body and the lower snap-fit ​​body together form an accommodating space inside, the displacement component is disposed in the accommodating space, an upper notch is provided at the connection between the upper snap-fit ​​body and the lower snap-fit ​​body, and a lower notch is provided at the connection between the lower snap-fit ​​body and the upper snap-fit ​​body, the lower notch and the upper notch are spliced ​​together to form the notch.

[0012] In other embodiments, the inner wall of the housing is provided with a sliding groove to guide the engaging member to rotate relative to the housing, and the edge of the engaging member engages with the sliding groove.

[0013] In other embodiments, the groove includes a first portion disposed in a horizontal direction and a second portion that curves upward relative to the horizontal surface, the first portion and the second portion being sequentially connected in the direction toward the bolt.

[0014] In other embodiments, the engaging member includes an engaging body and a pair of engaging arms. The engaging body is hinged to the first displacement member, and the engaging arms are fixed to the side of the engaging body facing the bolt. The pair of engaging arms are spaced apart, forming a gap that matches the bolt.

[0015] In other embodiments, a triggering component and an electric switch are also included. The electric switch is used to detect the state of the bolt assembly and the engaging member. The triggering component is movably disposed within the housing and is capable of actuating the electric switch when the bolt is in the locked position.

[0016] The beneficial effects of this utility model are as follows: In this utility model, a bolt, a locking part, and a limiting assembly are provided. The locking part includes a housing, a locking member, a first displacement member, a second displacement member, a first elastic member, and a second elastic member. The housing has a notch communicating with its interior. The locking member is connected to the first displacement member. The second displacement member is slidably connected to the inner wall of the housing. The first displacement member and the second displacement member are slidably connected. The first elastic member is located between the first displacement member and the second displacement member, with its two ends abutting against the first displacement member and the second displacement member respectively. The second elastic member is located inside the housing and connected to the second displacement member, so that the second displacement member always has a relative position to the notch. The limiting component, which is designed to prevent the door from retracting, includes an electromagnetic relay, a through-hole block, a spring, and a limiting block. The electromagnetic relay is fixed inside the housing and has a telescopic end. The through-hole block is fixed to the telescopic end of the electromagnet. The spring is sleeved on the telescopic end, with its two ends abutting against the electromagnetic relay and the through-hole block, respectively. The limiting block is rotatably mounted on the second displacement member. One end of the limiting block forms a locking end, and the other end passes through the through-hole block along the sliding direction of the second displacement member. When the telescopic end is extended to its maximum state, the locking end engages with the first displacement member. When the telescopic end is retracted to its minimum state, the locking end disengages from the first displacement member. When power is off, the electromagnetic relay cannot drive the locking end to disengage from the first displacement member, but the door needs to be opened, the cabinet door is pulled from the outside. The door bolt drives the locking member, the first displacement member, and the second displacement member to move outward against the force of the second elastic member. Thus, the door can be opened and closed under normal conditions and meets the need to open the door in an emergency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the household appliance door lock in this utility model; Figure 2 This is a schematic diagram of the structure of the household appliance door lock with the upper latch removed in this utility model; Figure 3 A cross-sectional schematic diagram of a door lock for a household appliance; Figure 4 This is a schematic diagram of the structure of the household appliance door lock of this utility model, after removing the upper and lower locking bodies; Figure 5 This is a schematic diagram of the household appliance door lock from another angle after removing the upper and lower locking bodies; Wherein: 1-door bolt, 11-bolt body; 2-Locking part, 21-Housing shell, 211-Notch, 212-Upper locking body, 213-Lower locking body, 214-Slide groove, 214a-First part, 214b-Second part, 22-Locking element, 221-Activating body, 222-Activating arm 222, 23-First displacement element, 231-Protrusion, 24-Second displacement element, 241-Limiting piece, 25-First elastic element, 26-Drive assembly, 261-Torsion spring, 262-Sector gear, 263-Rack; 3-Locking component, 31-Electromagnetic relay, 32-Through block, 33-Second elastic element, 34-Limit block; 4-Triggering component, 41-Abutting rod, 42-Triggering element, 43-Abutting spring; 5-Electric switch. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figure 1-5As shown, an embodiment of this utility model provides a door lock for a household appliance, comprising: a bolt 1, a locking part 2, and a limiting component 3. The locking part 2 includes a housing 21, a locking member 22, a first displacement member 23, a second displacement member 24, a first elastic member 25, and a driving component 26. A notch 211 is formed in the housing 21. The locking member 22 is connected to the first displacement member 23. The second displacement member 24 is slidably connected to the inner wall of the housing 21. The first displacement member 23 and the second displacement member 24 are slidably connected. The first elastic member 25 is disposed between the first displacement member 23 and the second displacement member 24, with its two ends abutting against the first displacement member 23 and the second displacement member 24 respectively. The driving component 26 is disposed inside the housing 21 and connected to the second displacement member 24, so that the second displacement member 24 always has a tendency to retract relative to the notch 211. The limiting component 3 includes an electromagnetic relay 31, a through block 32, a second elastic element 33, and a limiting block 34. The electromagnetic relay 31 is fixed inside the housing 21 and has a telescopic end. The through block 32 is fixed on the telescopic end of the electromagnet 31. The second elastic element 33 is sleeved on the telescopic end and its two ends abut against the electromagnetic relay 31 and the through block 32, respectively. The limiting block 34 is rotatably disposed on the second displacement element 24. One end of the limiting block 34 forms a snap-fit ​​end, and the other end passes through the through block 32 along the sliding direction of the second displacement element 24. When the telescopic end is extended to its maximum state and the first displacement element 23 moves relative to the second displacement element 24 to be close to the limiting block 34, the snap-fit ​​end snaps into the first displacement element 23. When the telescopic end is retracted to its minimum state, the snap-fit ​​end disengages from the first displacement element 23.

[0021] In use, the bolt 1 and the locking part 2 are fixed to the cabinet door and cabinet body respectively. Under normal conditions, the drive assembly 26 keeps the second displacement member 24 retracted inside the housing 21. When the cabinet door is closed, the bolt 1 moves closer to the locking part 2 and engages with the engaging member 22, pushing the engaging member 22 and the first displacement member 23 into the housing 21. The first displacement member 23 engages with the locking end, limiting the movement of the first displacement member 23 and the engaging member 22, thus locking the door. When the door is to be opened, the telescopic end of the electromagnetic relay 31 retracts to its minimum state, and the locking end engages with the locking part 24. When the first displacement member 23 disengages from the latch, the first elastic member 25 pushes the first displacement member 23 to move relative to the second displacement member 24, thereby causing the door bolt 1 to extend from the notch 211, thus opening the door. However, in abnormal conditions (e.g., when the electromagnetic relay 31 cannot drive the latching end to disengage from the first displacement member 23 during a power outage), if the door needs to be opened, pulling the cabinet door from the outside causes the door bolt 1 to move outward against the force of the drive assembly 26, along with the latching member 22, the first displacement member 23, and the second displacement member 24. At this time, the limiting block 34 slides relative to the through block 32, following the second displacement member 24. Thus, the door can be opened and closed under normal conditions and meets the need to open the door in an emergency.

[0022] In this utility model, a bolt, a locking part, and a limiting assembly are provided. The locking part includes a housing, a locking member, a first displacement member, a second displacement member, a first elastic member, and a second elastic member. The housing has a notch communicating with its interior. The locking member is connected to the first displacement member. The second displacement member is slidably connected to the inner wall of the housing. The first displacement member and the second displacement member are slidably connected. The first elastic member is located between the first displacement member and the second displacement member, with its two ends abutting against the first displacement member and the second displacement member respectively. The second elastic member is located inside the housing and connected to the second displacement member, so that the second displacement member always has a relative position to the notch. The limiting component, which is designed to prevent the door from retracting, includes an electromagnetic relay, a through-hole block, a spring, and a limiting block. The electromagnetic relay is fixed inside the housing and has a telescopic end. The through-hole block is fixed to the telescopic end of the electromagnet. The spring is sleeved on the telescopic end, with its two ends abutting against the electromagnetic relay and the through-hole block, respectively. The limiting block is rotatably mounted on the second displacement member. One end of the limiting block forms a locking end, and the other end passes through the through-hole block along the sliding direction of the second displacement member. When the telescopic end is extended to its maximum state, the locking end engages with the first displacement member. When the telescopic end is retracted to its minimum state, the locking end disengages from the first displacement member. When power is off, the electromagnetic relay cannot drive the locking end to disengage from the first displacement member, but the door needs to be opened, the cabinet door is pulled from the outside. The door bolt drives the locking member, the first displacement member, and the second displacement member to move outward against the force of the second elastic member. Thus, the door can be opened and closed under normal conditions and meets the need to open the door in an emergency.

[0023] Specifically, the bolt 1 includes a carrier plate and a bolt body 11. The bolt body 11 is fixed to the carrier plate, and the engaging member 22 can engage the bolt body 11 from the top to restrict the movement of the bolt body 11 relative to the locking part 2. In use, the carrier plate is fixed to one component, the locking part 2 is fixed to another component, and the engaging member 22 engages with the bolt body 11 to lock the two components. When the engaging member 22 disengages from the bolt body 11, the two components can be separated relative to each other.

[0024] The plug body 11 can take various shapes. In some feasible embodiments, the plug body 11 is cuboid. In some feasible embodiments, the plug body 11 is triangular prism; in some feasible embodiments, the plug body 11 is cylindrical.

[0025] In this embodiment, the bolt body 11 is spindle-shaped, and both the end of the bolt body 11 near the locking part 2 and the end away from the locking part 2 have a tapered surface.

[0026] Specifically, the housing 21 includes an upper snap-fit ​​body 212 and a lower snap-fit ​​body 213. The upper snap-fit ​​body 212 and the lower snap-fit ​​body 213 together form an accommodating space inside the housing. The first displacement member 23 and the second displacement member 24 are disposed in the accommodating space. An upper notch is provided at the connection between the upper snap-fit ​​body 212 and the lower snap-fit ​​body 213. A lower notch is provided at the connection between the lower snap-fit ​​body 213 and the upper snap-fit ​​body 212. The lower notch and the upper notch are spliced ​​together to form the notch 211. The snap-fit ​​member 22 can be retracted or extended relative to the notch 211.

[0027] Furthermore, the inner wall of the housing 21 is provided with a sliding groove 214 to guide the engaging member 22 to rotate relative to the housing 21, and the edge of the engaging member 22 engages with the sliding groove 214. When the engaging member 22 moves relative to the housing 21, the sliding groove 214 guides the engaging member 22 to rotate relative to the housing 21.

[0028] Specifically, the slide 214 includes a first part 214a arranged in the horizontal direction and a second part 214b that curves upward relative to the horizontal surface. The first part 214a and the second part 214b are sequentially connected in the direction toward the bolt 1. When the engaging member 22 is in the first part 214a, the engaging member 22 engages with the bolt 1. When the engaging member 22 is in the second part 214b, the engaging member 22 is separated from the bolt 1.

[0029] It should be noted that the first part 214a and the second part 214b can be disposed on the inner wall of the upper notch or on the inner wall of the lower notch. However, in this embodiment, the first part 214a and the second part 214b are respectively divided into upper and lower parts, one part is disposed on the inner wall of the upper notch and the other part is disposed on the inner wall of the lower notch. When the upper snap-fit ​​body 212 and the lower snap-fit ​​body 213 are engaged, the two parts surround to form the first part 214a and the second part 214b.

[0030] Specifically, the engaging component 22 includes an engaging body 221 and a pair of engaging arms 222. The engaging body 221 is hinged to the first displacement component 23, and the engaging arms 222 are fixed to the side of the engaging body 221 facing the bolt 1. The pair of engaging arms 222 are spaced apart, forming a gap that matches the bolt 1. In use, the engaging body 221 extends out relative to the housing 21, and the sliding groove 214 guides the engaging body 221 to flip upward, disengaging the engaging arms 222 from both sides of the bolt 1. When the engaging body 221 retracts relative to the housing 21, the sliding groove 214 guides the engaging body 221 to flip downward, causing the engaging arms 222 to fall from both sides of the bolt 1 and engage with the bolt 1.

[0031] Specifically, a protrusion 231 corresponding to the limiting block 34 is formed on the side of the first displacement member 23 near the limiting block 34.

[0032] Furthermore, the side of the protrusion 231 facing away from the bolt 1 is bent towards the bolt 1 to form an arc surface, and the side of the protrusion 231 facing the bolt 1 forms a locking surface perpendicular to the sliding direction of the first displacement member 23. In use, when the cabinet door is pushed to close, the first displacement member 23 slides into the housing 21. The side of the protrusion 231 facing away from the bolt 1 first contacts the locking end of the limiting block 34. Since it is an arc surface, after the limiting block 34 is pushed to rotate relative to the second displacement member 23, the locking end and the locking surface lock together, thereby forming a relative lock between the first displacement member 23 and the second displacement member 23.

[0033] Furthermore, the second displacement member 24 is strip-shaped, the bottom surface of the second displacement member 24 is slidably connected to the inside of the housing 21, and the top surface of the second displacement member 24 is in slidable contact with the first displacement member 23.

[0034] Furthermore, the top surface of the second displacement member 24 is provided with a plurality of pairs of opposing limiting pieces 241, the spacing between each pair of limiting pieces 241 matching the width of the first displacement member 23. In use, the first displacement member 23 is embedded between the limiting pieces 241, the limiting pieces 241 limiting the width of the first displacement member 23 so that the first displacement member 23 can only move relative to the second displacement member 24 along the length direction.

[0035] Furthermore, a first abutting surface is provided on the bottom surface of the displacement member 23, and a second abutting surface is provided on the top surface of the second displacement member 24. One end of the first elastic member 25 is embedded in the first abutting surface, and the other end is embedded in the second abutting surface.

[0036] The drive assembly 26 includes a torsion spring 261, a sector gear 262, and a rack 263. The rack 263 is fixed to one side of the second displacement member 24. The sector gear 262 is rotatably connected to the inner wall of the housing 21 and meshes with the rack 263. One end of the torsion spring 261 is fixed to the inner wall of the housing 21, and the other end is fixed to the sector gear 262. The torsion spring 261 applies a force to the sector gear 262, causing the sector gear 262 to rotate and its teeth to face away from the notch 211. Because of the force of the torsion spring 261, the teeth of the sector gear 262 face away from the notch 211, thereby causing the second displacement member 24 to always have a tendency to move into the housing 21.

[0037] Furthermore, the household appliance door lock also includes a triggering component 4 and an electric switch 5. The electric switch 5 is used to detect the state of the bolt assembly 1 and the engaging member 22. The triggering component 4 is movably disposed within the housing 21. The triggering component 4 can actuate the electric switch 5 when the bolt body 11 is in the locked position.

[0038] Furthermore, a button is provided on the surface of the electric switch 5. When the bolt body 11 is in the locked position, pushing the triggering component 4 can disengage it from the button to trigger the electric switch 5.

[0039] Furthermore, the triggering component 4 includes an abutment rod 41, a trigger element 42, and an abutment spring 43. The abutment rod 41 is movably disposed within the housing 21. One end of the abutment spring 43 is fixed to the inner wall of the housing 21, and the other end abuts against the trigger element 42. The abutment spring 43 allows the trigger element 42 to be elastically connected to the housing 21. One end of the abutment rod 41 has an abutment end that abuts against the bolt 11. The trigger element 42 is pivotally connected to the housing 21, with one end hinged to the abutment rod 41 and the other end being a free end. When the bolt 11 abuts against the abutment rod 41, it pushes the abutment rod 41 to move, thereby causing the trigger element 42 to rotate relative to the housing 21, disengaging the trigger element 42 from the button on the surface of the electric switch 5, thus triggering the electric switch 5.

[0040] To facilitate engagement between the bolt 11 and the abutment rod 41, the bolt 11 is formed with a pointed tip facing the locking part 2. The tip of the thin rod can pass through the gap of the engaging member 22 and abut against the end of the abutment rod 251.

[0041] The beneficial effects of this utility model are: In this utility model, a bolt, a locking part, and a limiting assembly are provided. The locking part includes a housing, a locking member, a first displacement member, a second displacement member, a first elastic member, and a second elastic member. The housing has a notch communicating with its interior. The locking member is connected to the first displacement member. The second displacement member is slidably connected to the inner wall of the housing. The first displacement member and the second displacement member are slidably connected. The first elastic member is located between the first displacement member and the second displacement member, with its two ends abutting against the first displacement member and the second displacement member respectively. The second elastic member is located inside the housing and connected to the second displacement member, so that the second displacement member always has a relative position to the notch. The limiting component, which is designed to prevent the door from retracting, includes an electromagnetic relay, a through-hole block, a spring, and a limiting block. The electromagnetic relay is fixed inside the housing and has a telescopic end. The through-hole block is fixed to the telescopic end of the electromagnet. The spring is sleeved on the telescopic end, with its two ends abutting against the electromagnetic relay and the through-hole block, respectively. The limiting block is rotatably mounted on the second displacement member. One end of the limiting block forms a locking end, and the other end passes through the through-hole block along the sliding direction of the second displacement member. When the telescopic end is extended to its maximum state, the locking end engages with the first displacement member. When the telescopic end is retracted to its minimum state, the locking end disengages from the first displacement member. When power is off, the electromagnetic relay cannot drive the locking end to disengage from the first displacement member, but the door needs to be opened, the cabinet door is pulled from the outside. The door bolt drives the locking member, the first displacement member, and the second displacement member to move outward against the force of the second elastic member. Thus, the door can be opened and closed under normal conditions and meets the need to open the door in an emergency.

[0042] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the module or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model.

Claims

1. A door lock for household appliances, characterized in that, include: bolt, The locking part includes a housing, a locking member, a first displacement member, a second displacement member, a first elastic member, and a second elastic member. The housing has a notch communicating with its interior. The locking member is connected to the first displacement member. The second displacement member is slidably connected to the inner wall of the housing. The first displacement member is slidably connected to the second displacement member. The first elastic member is located between the first displacement member and the second displacement member and its two ends abut against the first displacement member and the second displacement member, respectively. The second elastic member is located inside the housing and is connected to the second displacement member, so that the second displacement member always has a tendency to retract relative to the notch. as well as The limiting component includes an electromagnetic relay, a through block, a spring, and a limiting block. The electromagnetic relay is fixed inside the housing and has a telescopic end. The through block is fixed on the telescopic end of the electromagnet. The spring is sleeved on the telescopic end and its two ends abut against the electromagnetic relay and the through block, respectively. The limiting block is rotatably mounted on the second displacement member. One end of the limiting block forms a snap-fit ​​end, and the other end passes through the through block along the sliding direction of the second displacement member. When the telescopic end is extended to its maximum state and the first displacement member moves relative to the second displacement member to be close to the limiting block, the snap-fit ​​end snaps into the first displacement member. When the telescopic end is retracted to its minimum state, the snap-fit ​​end disengages from the first displacement member.

2. The household appliance door lock as described in claim 1, characterized in that, A protrusion corresponding to the limiting block is formed on the side of the first displacement member near the limiting block. The side of the protrusion away from the door bolt is bent towards the door bolt and forms an arc surface. The side of the protrusion facing the door bolt forms a locking surface perpendicular to the sliding direction of the first displacement member.

3. The household appliance door lock as described in claim 2, characterized in that, The second displacement member is strip-shaped, with its bottom surface slidably connected to the inside of the housing and its top surface slidably contacting the first displacement member.

4. The household appliance door lock as described in claim 3, characterized in that, The top surface of the second displacement member is provided with a plurality of pairs of opposing limiting plates, and the spacing between each pair of limiting plates matches the width of the first displacement member.

5. The household appliance door lock as described in claim 1, characterized in that, The drive assembly includes a torsion spring, a sector gear, and a rack. The rack is fixed to one side of the second displacement member. The sector gear is rotatably connected to the inner wall of the housing and meshes with the rack. One end of the torsion spring is fixed to the inner wall of the housing, and the other end is fixed to the sector gear. The torsion spring applies a force to the sector gear to make the sector gear rotate and the toothed portion of the sector gear face away from the notch.

6. The household appliance door lock as described in claim 1, characterized in that, The housing includes an upper snap-fit ​​body and a lower snap-fit ​​body. The upper snap-fit ​​body and the lower snap-fit ​​body together form an accommodating space inside the housing. The displacement component is disposed in the accommodating space. An upper notch is provided at the connection between the upper snap-fit ​​body and the lower snap-fit ​​body, and a lower notch is provided at the connection between the lower snap-fit ​​body and the upper snap-fit ​​body. The lower notch and the upper notch are spliced ​​together to form the notch.

7. The household appliance door lock as described in claim 1, characterized in that, The inner wall of the housing is provided with a sliding groove to guide the engaging member to rotate relative to the housing, and the edge of the engaging member engages with the sliding groove.

8. The household appliance door lock as described in claim 7, characterized in that, The slide includes a first portion arranged in a horizontal direction and a second portion that curves upward relative to the horizontal surface, the first portion and the second portion being sequentially connected in the direction toward the bolt.

9. The household appliance door lock as described in claim 1 or 8, characterized in that, The engaging component includes an engaging body and a pair of engaging arms. The engaging body is hinged to the first displacement member, and the engaging arms are fixed to the side of the engaging body facing the bolt. The pair of engaging arms are spaced apart, forming a gap that matches the bolt.

10. The household appliance door lock as described in claim 1, characterized in that, It also includes a triggering component and an electric switch, the electric switch being used to detect the state of the bolt assembly and the engaging member, the triggering component being movably disposed within the housing, the triggering component being able to actuate the electric switch when the bolt body is in the locked position.

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