Door lock of dish washing machine
By combining a locking wheel and a positioning block with a wax motor, a simplified door lock design for the dishwasher is achieved, solving the problems of complex structure and high cost in existing technologies and realizing a reliable automatic door opening function.
Patent Information
- Application Number
- CN202423113055.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing dishwasher door locks are complex and costly, and the automatic door opening function requires additional push rods and complex actuators, which affects aesthetics and space utilization.
The door opens and closes by using a combination of locking wheel, positioning block and micro switch. The door opens and closes automatically by rotating the locking tongue and locking wheel. The door opens automatically by combining with wax motor, which simplifies the structure and reduces costs.
It achieves a simplified design for dishwasher door locks, reduces product costs, occupies little space, is reliable, and has an automatic door opening function.
Smart Images
Figure CN223614786U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dishwashers, and particularly to a dishwasher door lock. Background Technology
[0002] To ensure the sealing and safety of the dishwasher during the washing process, dishwashers are generally equipped with a door lock mechanism to lock the door. This mechanism includes a lock body assembly and a sliding latch that inserts into the lock body assembly. In existing technologies, to achieve the difference between opening and closing force, a long, wide, and bulky latch needs to be installed on the door, affecting its aesthetics and occupying considerable installation space. To ensure the microswitch is released when the door is closed and pressed when the door is open, allowing the electronic control system to detect the door's open / closed status, a linkage and spring structure are required, increasing product cost. To provide an automatic door opening function, an electric push rod structure needs to be added outside the door lock to push the dishwasher door open to improve drying efficiency, increasing product complexity and cost. Furthermore, directly pushing the door open requires a long push rod stroke, necessitating the use of complex actuators such as wax motors or extra-long wax motors, which also increases product cost. Utility Model Content
[0003] This utility model discloses a dishwasher door lock to address the shortcomings of existing technologies.
[0004] To solve the above problems, the technical solution of this utility model is:
[0005] A dishwasher door lock includes a housing and a latch. The housing has a rotatable locking wheel, and the latch is mounted on the dishwasher door. The housing has a positioning block. One side of the locking wheel has a U-shaped first notch for accommodating the latch, and the other side has a second notch and a third notch. One side of the positioning block has a positioning protrusion. As the locking wheel rotates, the positioning protrusion falls into the second notch and the third notch, respectively. The latch has a first arc surface and a second arc surface, which are located on the same circumference. The diameter of this circle is smaller than the width between the two parallel surfaces of the U-shaped groove of the first notch.
[0006] The positioning block has a positioning guide inclined side one and a positioning guide inclined side two.
[0007] A micro switch is mounted on the outer edge of the locking wheel. The outer edge has a second contact surface and a third contact surface. When the positioning protrusion is located in the second notch, the sensing roller of the micro switch contacts the second contact surface. When the positioning protrusion is located in the third notch, the sensing roller of the micro switch contacts the third contact surface. The distances from the second contact surface and the third contact surface to the rotation axis of the locking wheel are different.
[0008] The second notch and the first contact surface near the second notch are arc-shaped surfaces.
[0009] A guide edge is provided extending outward from the U-shaped opening of the first notch.
[0010] A compression spring is provided on the other side of the positioning block, and the positioning protrusion contacts the outer surface of the locking wheel under the elastic force of the compression spring.
[0011] The positioning block is provided with a rotating arm, which has a rotating shaft, and the positioning block can rotate around the rotating shaft.
[0012] A torsion spring is installed at the rotation axis of the rotating arm.
[0013] The outer shell is equipped with a push block, which is driven by a wax motor. The positioning block and the push block are perpendicular to each other in the direction of movement. The push block has a push guide inclined edge. Under the push action of the push block, the push guide inclined edge can slide on the positioning guide inclined edge, thereby pushing the positioning block to move. A tension spring is installed on the outer contour of the locking wheel. The other end of the tension spring is fixed to the outer shell. When the positioning protrusion is located in the second notch, the tension spring is in a stretched state. The tension of the tension spring when the positioning protrusion is located in the second notch is less than the tension when the positioning protrusion is located in the third notch.
[0014] The beneficial effects of this utility model are: the opening and closing functions of the dishwasher are realized through the movement of the locking wheel and the locking tongue. Moreover, the combined mechanism is small in size, has small parts, simple and reliable structure, large fastening capacity, reliable locking, and occupies little space. It can also adopt an automatic door opening function on the original structure, reducing the additional cost increase brought by the new function. The mechanism is low in cost and more reliable in function. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the structure of this utility model;
[0017] Figure 3 This is a schematic diagram of the structure of this utility model;
[0018] Figure 4 This is a schematic diagram of the lock wheel of this utility model;
[0019] Figure 5 This is a schematic diagram of the structure of this utility model;
[0020] Figure 6 This is a schematic diagram of the structure of this utility model;
[0021] Figure 7 This is a schematic diagram of the structure of this utility model;
[0022] Figure 8 This is a schematic diagram of the structure of this utility model;
[0023] Figure 9 In this utility model Figure 1 Enlarged view of a portion of point A in the middle;
[0024] In the diagram: 1-Outer shell, 2-Locking wheel, 3-Positioning block, 4-Compression spring, 5-Locking tongue, 6-Push block, 7-Tension spring, 8-Torsion spring, 81-Motor, 82-Micro switch, 9-Dishwasher door, 20-Rotation axis, 21-First notch, 22-Second notch, 23-Third notch, 25-Second contact surface, 26-Third contact surface, 27-Guide edge, 51-First arc surface, 52-Second arc surface, 31-Positioning protrusion, 32-Positioning guide bevel one, 35-Positioning guide bevel two, 33-Rotating arm, 34-Rotating shaft, 62-Push guide bevel. Detailed Implementation
[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. In order to make the purpose, technical solution and advantages of this utility model clearer, the technical solution of this utility model will be described in detail below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of this utility model.
[0026] Example 1: The dishwasher door can be opened manually, see attached... Figure 1-4 This utility model includes a housing 1 and a locking tongue 5. A rotatable locking wheel 2 is installed on the housing 1, and the locking tongue 5 is installed on the dishwasher door 9. A positioning block 3 is installed on the housing 1. A U-shaped first notch 21 that can accommodate the locking tongue 5 is provided on one side of the locking wheel 2, and a second notch 22 and a third notch 23 are provided on the other side. A positioning protrusion 31 is provided on one side of the positioning block 3. As the locking wheel 2 rotates, the positioning protrusion 31 can fall into the second notch 22 and the third notch 23 respectively. The locking tongue 5 has a first arc surface 51 and a second arc surface 52. The first arc surface 51 and the second arc surface 52 are located on the same circumference, and the diameter of the circle is smaller than the width between the two parallel surfaces of the U-shaped groove of the first notch 21.
[0027] A micro switch 82 is mounted on the outer edge of the locking wheel 2. The outer edge has a second contact surface 25 and a third contact surface 26. When the positioning protrusion 31 is located in the second notch 22, the sensing roller of the micro switch 82 contacts the second contact surface 25. When the positioning protrusion 31 is located in the third notch 23, the sensing roller of the micro switch 82 contacts the third contact surface 26. The distances from the second contact surface 25 and the third contact surface 26 to the rotation axis 20 of the locking wheel 2 are different.
[0028] The positioning block 3 has a positioning guide inclined side 1 32 and a positioning guide inclined side 2 35.
[0029] The second notch 22 and the first contact surface 24 near the second notch are arc-shaped surfaces.
[0030] A guide edge 27 is provided extending outward from the U-shaped opening of the first notch 21.
[0031] A compression spring 4 is provided on the other side of the positioning block 3, and the positioning protrusion 31 contacts the outer surface of the wheel body of the locking wheel 2 under the elastic force of the compression spring 4.
[0032] When the door is closed, the latch 5 moves into the first notch 21 of the lock wheel 2, pushing the lock wheel 2 to rotate counterclockwise. Due to the cam engagement, the lock wheel 2 pushes the positioning block 3 to move to the left, compressing the compression spring 4. After passing the point of maximum radius, the positioning block 3 is reset to the right by the compression spring 4, so that the lock wheel 2 and the latch 5 move to the closed position.
[0033] When the door is closed, the locking wheel 2 rotates to the closed position, the positioning block 3 resets, and cooperates with the third notch 23 on the left side of the locking wheel 2 to provide locking force to the locking wheel 2 and fix the locking tongue 5 in the closed position. At this time, the radius of the locking wheel 2 in the direction of the micro switch 82 changes, causing the micro switch 82 to be in a changing state. The electronic control system can therefore detect the closed state of the door. When the user opens the door, the door pulls the locking tongue 5 outward, causing the locking wheel 2 to rotate clockwise, and the movement is the opposite of the above process.
[0034] Example 2: Figure 8 The positioning block 3 can also rotate under the dual action of the rotating arm 33 and the compression spring 4. The compression spring 4 provides thrust. The positioning block 3 is provided with a rotating arm 33, and the rotating arm 33 has a rotating shaft 34. The positioning block 3 can rotate around the rotating shaft 34.
[0035] Example 3: Figure 9 A torsion spring 8 is installed at the rotation shaft 34 of the rotating arm 33.
[0036] Example 4: The dishwasher can open its door automatically, using a wax motor 81 driven by a mechanism to achieve the opening of the door, such as... Figure 5-7 The outer shell 1 is equipped with a push block 6, which is pushed by a wax motor 81. The positioning block 3 and the push block 6 are perpendicular to each other in the direction of movement. The positioning block 3 has a positioning guide inclined edge 32, and the push block 6 has a pushing guide inclined edge 62. The pushing guide inclined edge 62 can slide on the positioning guide inclined edge 32 under the pushing action of the push block 6, thereby pushing the positioning block 3 to move. A tension spring 7 is installed on the outer contour of the locking wheel 2. The other end of the tension spring 7 is fixed to the outer shell 1. When the positioning protrusion 31 is located in the second notch 22, the tension spring 7 is in a stretched state. The tension of the tension spring 7 when the positioning protrusion 31 is located in the second notch 22 is less than the tension when the positioning protrusion 31 is located in the third notch 23.
[0037] The angle between the positioning guide hypotenuse 32 and the moving direction of the positioning block 3 is 45 degrees.
[0038] When an automatic door opening function is required, a wax motor 81, a push block 6, and a tension spring 7 need to be installed. The wax motor 81 is an electric actuator with a telescopic rod that extends when energized. The push block 6 is fixed to the telescopic rod of the wax motor 81. One end of the tension spring 7 is fixed to the lock wheel 2, and the other end is fixed to the outer casing 1. When the door is closed, the tension spring 7 is in a stretched state, providing preload to the lock wheel.
[0039] When the door opens automatically, the wax motor 81 push rod extends, the push block 6 moves forward, and pushes the positioning block 3 to slide to the left, causing the lock wheel 2 to lose its limit position. Under the tension of the tension spring 7 or the force from the opening direction of the latch 5, the lock wheel 2 rotates clockwise, causing the latch 5 to disengage, and the door opens automatically. After the wax motor 81 is de-energized, it returns to its original position, and the door lock returns to normal operation. When no power is supplied, the door lock is identical to its basic state and has normal manual opening and closing functions.
[0040] The above description is merely a specific embodiment of this utility model, but the protection scope 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 protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims. It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately. Furthermore, various different embodiments of this utility model can also be arbitrarily combined, as long as they do not violate the spirit of this utility model, they should also be considered as the content disclosed by this utility model.
Claims
1. A dishwasher door lock, comprising a housing and a latch, wherein a rotatable locking wheel is mounted on the housing, and the latch is mounted on the dishwasher door, characterized in that: The outer casing is equipped with a positioning block. One side of the locking wheel is provided with a U-shaped first notch that can accommodate the locking tongue, and the other side is provided with a second notch and a third notch. One side of the positioning block is provided with a positioning protrusion. As the locking wheel rotates, the positioning protrusion can fall into the second notch and the third notch respectively. The locking tongue has a first arc surface and a second arc surface. The first arc surface and the second arc surface are located on the same circumference. The diameter of the circle is smaller than the width between the two parallel surfaces of the U-shaped groove of the first notch.
2. The dishwasher door lock according to claim 1, characterized in that: The positioning block has a positioning guide inclined side one and a positioning guide inclined side two.
3. The dishwasher door lock according to claim 1, characterized in that: A micro switch is mounted on the outer edge of the locking wheel. The outer edge has a second contact surface and a third contact surface. When the positioning protrusion is located in the second notch, the sensing roller of the micro switch contacts the second contact surface. When the positioning protrusion is located in the third notch, the sensing roller of the micro switch contacts the third contact surface. The distances from the second contact surface and the third contact surface to the rotation axis of the locking wheel are different.
4. The dishwasher door lock according to claim 1, characterized in that: The second notch and the first contact surface near the second notch are arc-shaped surfaces.
5. The dishwasher door lock according to claim 1, characterized in that: A guide edge is provided extending outward from the U-shaped opening of the first notch.
6. The dishwasher door lock according to claim 1, characterized in that: A compression spring is provided on the other side of the positioning block, and the positioning protrusion contacts the outer surface of the locking wheel under the elastic force of the compression spring.
7. The dishwasher door lock according to claim 1, characterized in that: The positioning block is provided with a rotating arm, and the rotating arm has a rotating shaft, so that the positioning block can rotate around the rotating shaft.
8. The dishwasher door lock according to claim 7, characterized in that: A torsion spring is installed at the rotation axis of the rotating arm.
9. The dishwasher door lock according to claim 1, characterized in that: The outer shell is equipped with a push block, which is driven by a wax motor. The positioning block and the push block are perpendicular to each other in the direction of movement. The push block has a push guide inclined edge. Under the push action of the push block, the push guide inclined edge can slide on the positioning guide inclined edge, thereby pushing the positioning block to move. A tension spring is installed on the outer contour of the locking wheel. The other end of the tension spring is fixed to the outer shell. When the positioning protrusion is located in the second notch, the tension spring is in a stretched state. The tension of the tension spring when the positioning protrusion is located in the second notch is less than the tension when the positioning protrusion is located in the third notch.