Door lock of dish washing machine

Abstract

The invention discloses a dish-washing machine door lock which comprises a shell and a spring bolt, a rotatable lock wheel is installed on the shell, the spring bolt is installed on a dish-washing machine door body, and the dish-washing machine door lock is characterized in that a positioning block is installed on the shell, a U-shaped first notch capable of containing the spring bolt is formed in one side of the lock wheel, and a second notch and a third notch are formed in the other side of the lock wheel; a positioning protrusion is arranged on one side of the positioning block and can fall into the second notch and the third notch respectively along with rotation of the lock wheel, the spring bolt is provided with a first arc surface and a second arc surface, and 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 faces of the U-shaped groove of the first notch.

Description

Technical Field

[0001] The present invention relates to the field of dishwashers, and in particular to a dishwasher door lock. Background Art

[0002] In order to ensure the sealing performance and safety performance of the dishwasher during the washing process, the dishwasher is generally provided with a door lock mechanism for locking the machine door. The door lock mechanism specifically includes a lock body assembly and a lock tongue that can be slidably inserted in the lock body assembly. In the prior art, in order to achieve the difference between the door opening force and the door closing force, it is necessary to install a longer, wider and larger lock tongue on the door body, which affects the appearance of the door body and occupies more installation space. In order to ensure that the micro switch is released in the closed state and the micro switch is pressed in the open state so that the electronic control system can detect the open and close state of the door, it is necessary to add a connecting rod and a compression spring structure, which increases the product cost. When providing an automatic door opening function, it is necessary to add an electric push rod structure in addition to the door lock to push the dishwasher door open to improve the drying effect, which increases the complexity and cost of the product. In addition, directly pushing the door open requires the push rod to have a longer pushing stroke, and it is necessary to use complex actuators such as wax motors or extra-long wax motors, which also increases the cost of the product. Summary of the invention

[0003] The invention discloses a dishwasher door lock, which is used to solve the deficiencies of the prior art.

[0004] To solve the above problems, the technical solution of the present invention is:

[0005] A dishwasher door lock comprises a shell and a lock tongue, wherein a rotatable lock wheel is mounted on the shell, and the lock tongue is mounted on the dishwasher door body, wherein a positioning block is mounted on the shell, wherein a first U-shaped notch capable of accommodating the lock tongue is arranged on one side of the lock wheel, and a second notch and a third notch are arranged on the other side, wherein a positioning protrusion is arranged on one side of the positioning block, and the positioning protrusion can fall into the second notch and the third notch respectively as the lock wheel rotates, and wherein a first arc surface and a second arc surface are arranged on the lock tongue, wherein the first arc surface and the second arc surface 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.

[0006] The positioning block has a first positioning guide bevel and a second positioning guide bevel.

[0007] A micro switch is contact-mounted on the outer edge of the lock wheel, and 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 lock wheel are different.

[0008] The first contact surface on the second notch and close to the second notch is an arc-shaped surface.

[0009] A guide edge is provided extending outward from the U-shaped opening of the first notch.

[0010] A compression spring is arranged on the other side of the positioning block, and the positioning protrusion contacts the outer surface of the wheel body of the locking wheel under the elastic force of the compression spring.

[0011] The positioning block is provided with a rotating arm, the rotating arm is provided with a rotating shaft, and the positioning block can rotate around the rotating shaft.

[0012] A torsion spring is installed at the rotating shaft of the rotating arm.

[0013] A push block is installed on the shell, and the push block is pushed by a wax motor. The positioning block and the push block are perpendicular to each other in moving direction. The push block is provided with a pushing guide bevel. The pushing guide bevel can slide on the positioning guide bevel under the pushing action of the push block, thereby pushing the positioning block to move. A tension spring is installed on the outer contour of the locking wheel, and the other end of the tension spring is fixed on the shell. When the positioning protrusion is located in the second notch, the tension spring is in a stretched state. The tension force of the tension spring when the positioning protrusion is located in the second notch is less than the tension force when the positioning protrusion is located in the third notch.

[0014] The beneficial effects of the present invention are as follows: the door opening and closing functions of the dishwasher are realized through the movement of the locking wheel and the locking tongue, and the combined mechanism has a small size, small parts, a simple and reliable structure, a large buckling amount, reliable locking, and occupies less space. The automatic door opening function can be adopted on the original structure to reduce the increase in additional costs brought about by the new function. The mechanism has low cost and more reliable functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the locking wheel of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the present invention;

[0020] Figure 6 It is a structural schematic diagram of the present invention;

[0021] Figure 7 It is a structural schematic diagram of the present invention;

[0022] Figure 8 It is a structural schematic diagram of the present invention;

[0023] Fig. 9 For the present invention Figure 1 A partial enlarged schematic diagram in the middle;

[0024] In the figure: 1-housing, 2-lock wheel, 3-positioning block, 4-compression spring, 5-lock 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 edge 1, 35-positioning guide bevel edge 2, 33-rotating arm, 34-rotating axis, 62-pushing guide bevel edge. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other implementation modes obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0026] Embodiment 1: The dishwasher can be opened manually. Figure 1-4 The present invention comprises a shell 1 and a lock tongue 5, a rotatable lock wheel 2 is mounted on the shell 1, and the lock tongue 5 is mounted on the dishwasher door body 9, a positioning block 3 is mounted on the shell 1, a U-shaped first notch 21 capable of accommodating the lock tongue 5 is arranged on one side of the lock wheel 2, and a second notch 22 and a third notch 23 are arranged on the other side, a positioning protrusion 31 is arranged on one side of the positioning block 3, and the positioning protrusion 31 can fall into the second notch 22 and the third notch 23 respectively as the lock wheel 2 rotates, and a first arc surface 51 and a second arc surface 52 are provided on the lock tongue 5, and 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 contact-mounted on the outer edge of the lock wheel 2, and 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 lock wheel 2 are different.

[0028] The positioning block 3 has a first positioning guide bevel 32 and a second positioning guide bevel 35 .

[0029] The second notch 22 and the first contact surface 24 close to one side of 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 disposed on the other side of the positioning block 3 , and the positioning protrusion 31 is in contact with the outer surface of the wheel body of the locking wheel 2 under the elastic force of the compression spring 4 .

[0032] When closing the door, the lock tongue 5 moves into the first notch 21 of the lock wheel 2, pushing the lock wheel 2 to rotate counterclockwise. Due to the cooperation of the cam, the lock wheel 2 pushes the positioning block 3 to move to the left, compressing the compression spring 4. After passing the maximum radius point, the positioning block 3 is reset to the right by the compression spring 4, so that the lock wheel 2 and the lock tongue 5 move to the door closing position.

[0033] When the door is closed, the lock wheel 2 rotates to the door closing position, and the positioning block 3 is reset, cooperating with the third notch 23 on the left side of the lock wheel 2 to provide locking force for the lock wheel 2 and fix the lock tongue 5 in the door closing position. At this time, the radius of the lock wheel 2 in the direction of the micro switch 82 changes, so that the micro switch 82 is in a changing state, and the electronic control system can therefore detect the closed state of the door body. When the user opens the door, the door body pulls the lock tongue 5 outward, causing the lock wheel 2 to rotate clockwise, and the movement is opposite to the above process.

[0034] Embodiment 2: as Figure 8 The positioning block 3 can also be rotated by the dual action of the rotating arm 33 and the compression spring 4, and the compression spring 4 provides thrust. A rotating arm 33 is provided on the positioning block 3, and a rotating shaft 34 is provided on the rotating arm 33. The positioning block 3 can rotate around the rotating shaft 34.

[0035] Embodiment 3: Fig. 9 A torsion spring 8 is installed at the rotating shaft 34 of the rotating arm 33.

[0036] Embodiment 4: The dishwasher can open the door automatically by using the wax motor 81 through the driving mechanism to open the door. Figure 5-7 A push block 6 is installed on the shell 1, and the push block 6 is pushed by the wax motor 81. The positioning block 3 and the push block 6 are perpendicular to each other in the moving direction. The positioning block 3 has a positioning guide bevel 32, and the push block 6 has a pushing guide bevel 62. The pushing guide bevel 62 can slide on the positioning guide bevel 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 lock wheel 2, and the other end of the tension spring 7 is fixed on the 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 included angle between the positioning guide bevel 32 and the moving direction of the positioning block 3 is 45 degrees.

[0038] When the automatic door opening function is required, the wax motor 81, the push block 6 and the tension spring 7 need to be installed. The wax motor 81 is an electric actuator with a telescopic rod. The telescopic rod extends after power is turned on. 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 housing 1. When the door is closed, the tension spring 7 is in a stretched state to provide pre-tension for the lock wheel.

[0039] When the door is opened automatically, the push rod of the wax motor 81 extends, the push block 6 moves forward, and the positioning block 3 slides to the left, causing the lock wheel 2 to lose its limit. Under the tension of the tension spring 7 or the force from the lock tongue 5 in the door opening direction, the lock wheel 2 rotates clockwise to make the lock tongue 5 come out, and the door body opens automatically. After the wax motor 81 is powered off, it returns to its original position, and the door lock returns to its normal state. When it is not powered on, the door lock is the same as the basic state, and has the normal manual door opening and closing function.

[0040] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further explain various possible combinations. In addition, the various different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A dishwasher door lock, comprising a housing and a lock tongue, wherein a rotatable lock wheel is mounted on the housing, and the lock tongue is mounted on the dishwasher door body, characterized in that: A positioning block is installed on the shell, a U-shaped first notch that can accommodate a lock tongue is provided on one side of the lock wheel, and a second notch and a third notch are provided on the other side. A positioning protrusion is provided on one side of the positioning block. As the lock wheel rotates, the positioning protrusion can fall into the second notch and the third notch respectively. The lock tongue has a first arc surface and a second arc surface, and the first arc surface and the second arc surface 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.

2. The dishwasher door lock according to claim 1, characterized in that: The positioning block has a first positioning guide bevel and a second positioning guide bevel.

3. The dishwasher door lock according to claim 1, characterized in that: A micro switch is contact-mounted on the outer edge of the lock wheel, and 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 lock wheel are different.

4. The dishwasher door lock according to claim 1, characterized in that: The first contact surface on the second notch and close to the second notch is an arc-shaped surface.

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 arranged on the other side of the positioning block, and the positioning protrusion contacts the outer surface of the wheel body 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, the rotating arm is provided with a rotating shaft, and 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 rotating shaft of the rotating arm.

9. The dishwasher door lock according to claim 1, characterized in that: A push block is installed on the shell, and the push block is pushed by a wax motor. The positioning block and the push block are perpendicular to each other in moving direction. The push block is provided with a pushing guide bevel. The pushing guide bevel can slide on the positioning guide bevel under the pushing action of the push block, thereby pushing the positioning block to move. A tension spring is installed on the outer contour of the locking wheel, and the other end of the tension spring is fixed on the shell. When the positioning protrusion is located in the second notch, the tension spring is in a stretched state. The tension force of the tension spring when the positioning protrusion is located in the second notch is less than the tension force when the positioning protrusion is located in the third notch.

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