Household appliance

Abstract

The utility model relates to a household appliance which comprises a box body with an opening in the front side. The dish rack is arranged in the box body; the guide rails extend in the front-and-back direction and can move front and back to enter and exit from the box body, the two guide rails are arranged on the left side and the right side of the dish rack respectively, and the guide rails and the dish rack can be relatively fixed in the front-and-back direction; in the state that the guide rail moves to the position close to the front limit position, the guide rail inclines downwards from back to front, the component force of gravity provides a part of pull-out force, namely assisting force with a certain inclination, and therefore labor can be saved when the dish rack continues to be pulled outwards.

Description

Technical Field

[0001] The utility model relates to a household appliance. Background Art

[0002] Household appliances such as washing machines and disinfection cabinets have greatly facilitated people's lives. In the prior art, household appliances have an inner cavity, which contains a dish rack for placing tableware. To facilitate placing and removing tableware from the dish rack, the dish rack needs to be able to be pulled back and forth.

[0003] For example, in the Chinese utility model patent application CN202321296206.4 (publication number CN219846471U), entitled "A Guide Rail Structure for Household Appliances and Household Appliances," the guide rail structure includes an axle, a guide rail, and a roller. Along the axial extension direction of the axle, the longitudinal cross-section of each portion of the outer peripheral wall of the roller has a straight section, and a first D-shaped gap is formed between the straight section and the corresponding position of the inner peripheral wall of the guide rail. The presence of the first gap reduces the contact area between the outer peripheral wall of the roller and the inner peripheral wall of the guide rail, thereby reducing the friction between the two, resulting in smoother and more labor-saving pushing and pulling of the guide rail, satisfying the user experience.

[0004] This patent reduces the contact area between the outer wall of the roller and the inner wall of the guide rail to make the guide rail move smoothly. However, since the bowl rack is heavy when tableware is placed on it, a large force is still required to pull the bowl rack, so further improvement is needed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a household appliance which can push and pull a bowl rack with relatively less effort in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a household appliance comprising

[0007] Box, open front;

[0008] A bowl rack is arranged in the box;

[0009] The guide rails extend in the front-to-back direction and can move forward and backward to enter and exit the box body. There are two guide rails and they are respectively arranged on the left and right sides of the bowl rack. The guide rails can be relatively fixed with the bowl rack in the front-to-back direction.

[0010] The invention is characterized in that when the guide rail moves to a position close to the front limit, the guide rail tilts downward from rear to front.

[0011] In order to make the guide rail reach the tilted state, the guide rail is provided with a guide groove extending in the front and rear directions, and the guide rail is correspondingly provided with a roller assembly, which includes

[0012] The wheel axle is relatively fixed in the box, and the wheel axle extends in the left and right directions;

[0013] A roller is embedded in the guide groove and can generate relative displacement with the guide rail in the front-back direction. The roller is sleeved on the wheel axle and can rotate around the axis of the wheel axle;

[0014] Each guide rail is equipped with two groups of roller assemblies which are spaced apart in the front-to-back direction. The axis of the wheel axle of the roller assembly at the rear side is higher than the axis of the wheel axle of the roller assembly at the front side.

[0015] To reduce friction between the guide rail and the roller, an inner sleeve is positioned between the axle and the roller. Rotatable balls are positioned between the inner sleeve and the roller. Multiple balls are spaced circumferentially around the inner sleeve. As the guide rail moves, the roller rotates, creating rolling friction between the roller and the inner sleeve via the balls. This reduces friction, allowing the roller to rotate more smoothly, reducing friction with the guide rail and enabling smoother sliding of the guide rail.

[0016] In order to position the ball, a first arc-shaped groove is provided on the outer peripheral wall of the inner sleeve, which is recessed toward the axis of the wheel axle, and a second arc-shaped groove is provided on the inner peripheral wall of the roller, which is arched away from the axis of the wheel axle. The first arc-shaped groove is for partially embedding the ball, and the second arc-shaped groove is for partially embedding the ball.

[0017] Preferably, the radius of the first arcuate groove is R1, the radius of the ball is r, R1>r, and the center of the first arcuate groove is located outside the center of the ball, so that the contact area between the ball and the first arcuate groove is small, reducing rotational friction.

[0018] Preferably, the radius of the second arcuate groove is R2, the radius of the ball is r, R2>r, and the center of the second arcuate groove is located inside the center of the ball. In this way, the contact area between the ball and the second arcuate groove is small, reducing rotational friction.

[0019] Preferably, a positioning sleeve is provided between the inner sleeve and the roller. The centerline of the positioning sleeve aligns with the axis of the wheel axle, and the positioning sleeve is fixed relative to the roller. The positioning sleeve is provided with a plurality of positioning holes along its circumference, into which the balls are placed in a one-to-one correspondence. The positioning sleeve evenly separates the balls, ensuring smooth rotation of the roller, and serves to position the balls, preventing them from straying from the roller or inner sleeve and affecting the normal rotation of the roller assembly.

[0020] In order to fix the positioning sleeve relative to the roller, the positioning sleeve can be welded to the roller, or a circle of ribs can be provided on the outer peripheral wall of the positioning sleeve, and when the positioning sleeve is located between the roller and the inner sleeve, the ribs have an interference fit with the inner peripheral wall of the roller; or a circle of ribs can be provided on the inner peripheral wall of the roller, and when the positioning sleeve is located between the roller and the inner sleeve, the ribs have an interference fit with the roller.

[0021] Preferably, each of the positioning holes passes through the end wall of one end of the positioning sleeve to form an entrance, and the ball enters the positioning hole from the entrance, and the entrance of the positioning hole is a cone with a gradually decreasing diameter along the direction in which the ball enters the positioning hole. The cone-shaped structure serves as a guide, making it easier to place the ball in the corresponding positioning hole.

[0022] In order to allow the bowl rack to have a larger moving range and be able to move outside the box, a rotatable sliding member is provided above and / or below the guide rail, the rotation axis of the sliding member extends in the left and right directions, and the sliding member slides in cooperation with the guide rail. The sliding member is installed on the bowl rack, and both ends of the guide rail are provided with a positioning portion that can resist the sliding member.

[0023] The household appliance may be a disinfection cabinet, or may be a washing machine capable of washing tableware and / or fruits and vegetables.

[0024] Compared with the existing technology, the advantages of the present invention are as follows: when the guide rail is moved to a position near the front limit, the guide rail is tilted from the back to the front and downward, so it will be more difficult to pull the bowl rack out at the beginning. However, when the guide rail is tilted from the back to the front and downward, the component force of gravity provides part of the pulling force, that is, there is an inclined assist, which makes it easier to continue pulling the bowl rack out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0026] Figure 2 for Figure 1 sectional view of

[0027] Figure 3 for Figure 2 A magnified view of point A;

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the bowl rack, guide rail, sliding member and roller assembly (the bowl rack is located at the rear limit position);

[0029] Figure 5 for Figure 1 Schematic diagram of the structure of the bowl rack, guide rail, sliding member and roller assembly (the bowl rack is located at the front limit position);

[0030] Figure 6 This is a cross-sectional view of the roller assembly of Example 2 of the present utility model;

[0031] Figure 7 for Figure 6 Schematic diagram of the structure of the positioning sleeve. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0033] Example 1

[0034] like Figures 1 to 5 As shown, the household appliance of this preferred embodiment is a washing machine capable of washing dishes and / or fruits and vegetables. Of course, the household appliance can also be a disinfection cabinet.

[0035] The household appliance comprises a housing 1 , a bowl rack 2 , a guide rail 3 and a roller assembly 4 .

[0036] The front side of the box body 1 is open, and the guide rail 3 extends in the front-to-back direction. The guide rail 3 and the bowl rack 2 can both move back and forth to enter and exit the box body 1. A sliding member 21 is provided above and / or below the guide rail 3. The sliding member 21 can be rotatably mounted on the bowl rack 2. The rotation axis of the sliding member 21 extends in the left-right direction, and the sliding member 21 slides in cooperation with the guide rail 3. Both ends of the guide rail 3 are provided with a positioning portion 31 that can abut against the sliding member 21.

[0037] When the slider 21 is not in contact with the positioning portion 31, the slider 21 slides along the guide rail 3. In this case, the guide rail 3 does not move, and only the dish rack 2 moves. When the slider 21 is in contact with the positioning portion 31, the slider 21 and the guide rail 3 are relatively fixed in the forward or backward direction. In this case, the guide rail 3 and the dish rack 2 move synchronously, and the dish rack 2 is relatively fixed in the front-to-back direction relative to the guide rail 3. This coordination between the guide rail 3 and the dish rack 2 allows the dish rack 2 to have a longer movement trajectory.

[0038] The roller assembly 4 includes an axle 41 and a roller 42 . Guide rails 3 and roller assemblies 4 are provided on both sides of the bowl rack 2 . Sliders 21 that can slide with the guide rails 3 are provided on both sides of the bowl rack 2 .

[0039] The axle 41 is relatively fixedly positioned within the housing 1 and extends in the left-right direction. In this embodiment, a through-hole is provided on the side wall of the housing 1, through which one end of the axle 41 passes and is fixedly connected with a screw 47. A reinforcing plate 43 is provided on the housing 1 at the through-hole. Preferably, the reinforcing plates 43 are provided on both the outer and inner walls of the housing 1.

[0040] The guide rail 3 has a guide groove 32 extending in the front-to-back direction. A roller 42 is embedded in the guide groove 32 and can move relative to the guide rail 3 in the front-to-back direction. The roller 42 is mounted on the axle 41 and can rotate about the axis of the axle 41. The ends of the guide groove 32 are closed to limit the travel of the guide rail 3. As the roller 42 rotates about the axle 41, the guide rail 3 moves back and forth, and the friction between the roller 42 and the axle 41 is relatively low.

[0041] In this embodiment, each guide rail 3 is equipped with two groups of roller assemblies 4, which are spaced apart in the front-to-back direction. The axis of the wheel axle 41 of the roller assembly 4 located on the rear side is higher than the axis of the wheel axle 41 of the roller assembly 4 located on the front side, so that when the guide rail 3 moves to a position adjacent to the rear limit, the guide rail 3 tilts downward from front to rear, and when the guide rail 3 moves to a position adjacent to the front limit, the guide rail 3 tilts downward from rear to front.

[0042] The advantage of this design is that it will be more laborious when pulling the bowl rack 2 outward at the beginning, but because there is a height difference between the two wheel axles 41, when the guide rail 3 moves to the position near the front limit, the guide rail 3 tilts downward from the back to the front, and the component force of gravity provides a part of the pulling force, that is, there is an inclined assist, which makes it easier to pull the bowl rack 2 outward. Similarly, when the guide rail 3 moves to the position near the rear limit, the center of the bowl rack 2 passes the roller assembly 4 on the rear side. At this time, the force direction changes, and pushing the bowl rack 2 inward will also be easier.

[0043] Example 2

[0044] like Figure 6 、 7 As shown, the difference between Example 2 and Example 1 is that the roller assembly 4 of this embodiment further includes an inner sleeve 44 , a positioning sleeve 45 and a ball 46 .

[0045] An inner sleeve 44 is provided between the axle 41 and the roller 42 , and a rotatable ball 46 is provided between the inner sleeve 44 and the roller 42 . There are a plurality of balls 46 , which are spaced apart along the circumference of the inner sleeve 44 .

[0046] Specifically, a positioning sleeve 45 is provided between the inner sleeve 44 and the roller 42. The positioning sleeve 45 is fixed relative to the roller 42. The positioning sleeve 45 is provided with a plurality of positioning holes 451 along its circumference, into which the balls 46 are placed in a one-to-one correspondence. Each positioning hole 451 passes through the end wall of one end of the positioning sleeve 45 to form an entrance 452. The balls 46 enter the positioning holes 451 through the entrance 452. The entrance 452 of the positioning holes 451 is tapered in a gradually decreasing diameter along the direction in which the balls 46 enter the positioning holes 451. The tapered structure serves as a guide, facilitating the placement of the balls 46 in the corresponding positioning holes 451. The positioning sleeve 45 evenly separates the balls 46, ensuring smooth rotation of the roller 42. It also serves to position the balls 46, preventing them from deviating from the roller 42 or the inner sleeve 44 and affecting the normal rotation of the roller assembly 4.

[0047] The positioning sleeve 45 and the roller 42 can be welded together, or a circle of ribs 453 can be provided on the outer peripheral wall of the positioning sleeve 45. The ribs 453 are preferably made of a flexible material. When the positioning sleeve 45 is located between the roller 42 and the inner sleeve 44, the ribs 453 have an interference fit with the inner peripheral wall of the roller 42; or, a circle of ribs 453 can be provided on the inner peripheral wall of the roller 42. When the positioning sleeve 45 is located between the roller 42 and the inner sleeve 44, the ribs 453 have an interference fit with the roller 42.

[0048] A first arcuate groove 441 is provided on the outer peripheral wall of the inner sleeve 44 and is recessed toward the axis of the wheel axle 41 . A second arcuate groove 421 is provided on the inner peripheral wall of the roller 42 and is arched away from the axis of the wheel axle 41 . The first arcuate groove 441 is partially embedded in the ball 46 , and the second arcuate groove 421 is partially embedded in the ball 46 .

[0049] The radius of the first arcuate groove 441 is R1, and the radius of the ball 46 is r, where R1>r. The center of the first arcuate groove 441 is located outside the center of the ball 46, where "outside" refers to a direction away from the axis of the axle 41. This reduces the contact area between the ball 46 and the first arcuate groove 441, thereby reducing rotational friction.

[0050] The radius of the second arcuate groove 421 is R2, and the radius of the ball 46 is r, where R2>r. The center of the second arcuate groove 421 is located inward of the center of the ball 46, where "inward" refers to the direction closer to the axis of the axle 41. This reduces the contact area between the ball 46 and the second arcuate groove 421, thereby reducing rotational friction.

[0051] When the guide rail 3 moves, the roller 42 rotates, and rolling friction is formed between the roller 42 and the inner sleeve 44 through the ball 46. The friction is small, so that the roller 42 rotates more smoothly, reducing the friction between the roller 42 and the guide rail 3, so that the guide rail 3 can slide smoothly, further making it easier to push and pull the bowl rack 2.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A household appliance comprising The box body (1) is open at the front; A bowl rack (2) is arranged in the box (1); A guide rail (3) extends in the front-to-back direction and can move forward and backward to enter and exit the box (1); there are two guide rails (3) and they are respectively arranged on the left and right sides of the bowl rack (2); the guide rails (3) can be relatively fixed to the bowl rack (2) in the front-to-back direction; It is characterized by: When the guide rail (3) moves to a position close to the front limit, the guide rail (3) tilts downward from the rear to the front.

2. The household appliance according to claim 1, wherein: The guide rail (3) is provided with a guide groove (32) extending in the front-back direction. The guide rail (3) is correspondingly provided with a roller assembly (4). The roller assembly (4) includes The wheel axle (41) is relatively fixedly located in the box (1), and the wheel axle (41) extends in the left-right direction; A roller (42) is embedded in the guide groove (32) and can generate relative displacement with the guide rail (3) in the front-rear direction. The roller (42) is sleeved on the wheel shaft (41) and can rotate around the axis of the wheel shaft (41); Each guide rail (3) is equipped with two groups of roller assemblies (4) which are spaced apart in the front-to-back direction, and the axis of the wheel axle (41) of the roller assembly (4) located at the rear side is higher than the axis of the wheel axle (41) of the roller assembly (4) located at the front side.

3. The household appliance according to claim 2, wherein: An inner sleeve (44) sleeved on the wheel axle (41) is provided between the wheel axle (41) and the roller (42). Rotatable balls (46) are provided between the inner sleeve (44) and the roller (42). A plurality of balls (46) are provided and spaced apart along the circumference of the inner sleeve (44).

4. The household appliance according to claim 3, wherein: The outer peripheral wall of the inner sleeve (44) is provided with a first arc-shaped groove (441) that is recessed toward the axis of the wheel shaft (41), and the inner peripheral wall of the roller (42) is provided with a second arc-shaped groove (421) that is arched away from the axis of the wheel shaft (41). The first arc-shaped groove (441) is for partially embedding the ball (46), and the second arc-shaped groove (421) is for partially embedding the ball (46).

5. The household appliance according to claim 4, characterized in that: The radius of the first arc-shaped groove (441) is R1, the radius of the ball (46) is r, R1>r, and the center of the first arc-shaped groove (441) is located outside the center of the ball (46).

6. The household appliance according to claim 4, wherein: The radius of the second arc-shaped groove (421) is R2, the radius of the ball (46) is r, R2>r, and the center of the second arc-shaped groove (421) is located inside the center of the ball (46).

7. The household appliance according to claim 3, wherein: A positioning sleeve (45) is further provided between the inner sleeve (44) and the roller (42). The center line of the positioning sleeve (45) is in the same extension direction as the axis of the wheel shaft (41). The positioning sleeve (45) is fixed relative to the roller (42). The positioning sleeve (45) is provided with a plurality of positioning holes (451) along its circumference for the balls (46) to be placed therein in a one-to-one correspondence.

8. The household appliance according to claim 7, wherein: Each positioning hole (451) passes through the end wall of one end of the positioning sleeve (45) to form an entrance (452), and the ball (46) enters the positioning hole (451) from the entrance (452), and the entrance (452) of the positioning hole (451) is tapered with a gradually decreasing diameter along the direction in which the ball (46) enters the positioning hole (451).

9. The household appliance according to any one of claims 1 to 8, characterized in that: A rotatable sliding member (21) is provided above and / or below the guide rail (3), the rotation axis of the sliding member (21) extends in the left-right direction, and the sliding member (21) and the guide rail (3) are slidably matched, the sliding member (21) is installed on the bowl rack (2), and both ends of the guide rail (3) are provided with positioning portions (31) that can abut against the sliding member (21).

10. The household appliance according to any one of claims 1 to 8, characterized in that: The household appliance is a washing machine capable of washing dishes and / or fruits and vegetables.

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