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; the rolling wheel assembly comprises a wheel shaft and is located in the box body, and the wheel shaft extends in the left-right direction; the rolling wheel is embedded in the guide groove, can generate relative displacement with the guide rail in the front-back direction, and is arranged on the wheel shaft in a sleeving manner and can rotate around the axis of the wheel shaft; each guide rail is provided with two sets of roller assemblies which are arranged at intervals in the front-back direction, the wheel shaft of at least one set of roller assemblies can move, and therefore the wheel shaft of one set of roller assemblies can move till the axis of the wheel shaft of the other set of roller assemblies is located above or below the axis of the wheel shaft of the other set of roller assemblies. And the dish rack is labor-saving to push and pull.

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] Roller assembly, including

[0011] The wheel axle is located in the box body and extends in the left and right directions;

[0012] A roller is embedded in the guide groove and can generate relative displacement with the guide rail in the front-rear direction. The roller is sleeved on the wheel axle and can rotate around the axis of the wheel axle.

[0013] It is characterized in that each guide rail is equipped with two groups of roller assemblies which are spaced apart in the front-to-back direction, and the axles of at least one group of roller assemblies can move, so that the axles of one group of roller assemblies can move until their axes are located above or below the axes of the axles of the other group of roller assemblies.

[0014] In order to enable the wheel axle to move, one of the wheel axles is connected to a drive rod, and the drive rod is driven and connected to the driving member so that the drive rod can rotate around its axis. The drive rod extends in the left and right directions, and the axis of the drive rod and the axis of the wheel axle are at different heights.

[0015] Preferably, the axle of the roller assembly located at the rear side is connected to the driving rod, and the axle of the roller assembly located at the front side is fixed relative to the box.

[0016] In the above solution, the driving member is a motor and is located outside the box. One end of the driving rod passes through the box and is connected to the motor, and the other end is connected to the corresponding wheel axle. The driving member does not occupy the space inside the box.

[0017] Preferably, when the guide rail is moving forward, the axle of the roller assembly at the rear side is higher than the axle of the roller assembly at the front side, and when the guide rail is moving backward, the axle of the roller assembly at the rear side is lower than the axle of the roller assembly at the front side. In this way, when the guide rail moves forward, the guide rail tilts downward from back to front, and the component force of gravity provides a portion of the pulling force, that is, there is a sloping assist, making it easier to pull the dish rack outward. Similarly, when the guide rail moves backward, the guide rail tilts downward from front to back, and there is also a sloping assist, making it easier to push the dish rack inward.

[0018] 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.

[0019] In order to position the ball, a first arc-shaped groove is provided on the outer peripheral wall of the inner sleeve and is recessed toward the axis of the wheel axle. A second arc-shaped groove is provided on the inner peripheral wall of the roller and is arched toward the axis away from 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.

[0020] 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.

[0021] 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.

[0022] 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. The positioning sleeve is fixed relative to the roller and has multiple positioning holes along its circumference for the balls to be positioned in one-to-one correspondence. The positioning sleeve evenly spaces the balls, ensuring smooth rotation of the roller and positioning the balls to prevent them from straying from the roller or inner sleeve and affecting the normal rotation of the roller assembly.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] The household appliance may be a disinfection cabinet, or may be a washing machine capable of washing tableware and / or fruits and vegetables.

[0027] Compared with the prior art, the advantages of the present invention are as follows: the present invention enables the axle of one group of roller assemblies to be movable so that its axis is above or below the axis of the axle of the other group of roller assemblies, thereby allowing the guide rail to be in an inclined state. When pushing and pulling the bowl rack, the guide rail is tilted so that gravity has a forward or backward component, making pushing and pulling the bowl rack effortless. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0029] Figure 2 for Figure 1 (cut from the rear side of the roller assembly);

[0030] Figure 3 for Figure 2 A magnified view of point A;

[0031] Figure 4 for Figure 3 Schematic diagram of the structure of the wheel axle and the driving rod;

[0032] Figure 5 for Figure 1 (cut from the front side of the roller assembly);

[0033] Figure 6 for Figure 5 Enlarged view of point B;

[0034] Figure 7 It is a structural diagram of the bowl rack in the rear limit position;

[0035] Figure 8 This is a structural diagram of the bowl rack in the front limit position;

[0036] Figure 9 A cross-sectional view of the front roller assembly of Example 2 of the present utility model;

[0037] Figure 10 for Figure 9 Schematic diagram of the structure of the positioning sleeve. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0039] Example 1

[0040] like Figures 1 to 8 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.

[0041] The household appliance comprises a housing 1 , a bowl rack 2 , a guide rail 3 and a roller assembly 4 .

[0042] 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.

[0043] 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 travel range.

[0044] like Figures 6 to 8 As shown, the roller assembly 4 includes an axle 41 and a roller 42. The axle 41 is located in the box body 1 and extends in the left and right directions. Guide rails 3 and roller assemblies 4 are provided on the left and right sides of the bowl rack 2, and sliding parts 21 that can slide with the guide rails 3 are provided on the left and right sides of the bowl rack 2.

[0045] 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.

[0046] 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 axles 41 of at least one group of roller assemblies 4 can move, so that the axles 41 of one group of roller assemblies 4 can move until their axes are above or below the axes of the axles 41 of the other group of roller assemblies 4.

[0047] Specifically, one of the axles 41 is connected to a drive rod 44 rotatably mounted on the box body 1, and the drive rod 44 is driven and connected to a drive member 45, so that the drive rod 44 can rotate around its axis. The drive rod 44 extends in the left and right directions, and the axis of the drive rod 44 and the axis of the axle 41 are at different heights.

[0048] In this embodiment, the axle 41 of the roller assembly 4 at the rear side is connected to the driving rod 44, and the axle 41 of the roller assembly 4 at the front side is fixed relative to the housing 1. In this way, when the guide rail 3 moves forward, the axle 41 of the roller assembly 4 at the rear side is higher than the axle 41 of the roller assembly 4 at the front side, and the guide rail 3 tilts downward from the rear to the front. The component force of gravity provides a part of the pulling force, that is, there is a gradient assist, which makes it easier to pull the dish rack 2 outward; when the guide rail 3 moves backward, the axle 41 of the roller assembly 4 at the rear side is lower than the axle 41 of the roller assembly 4 at the front side, and the guide rail 3 tilts downward from the front to the rear. At this time, there is also a gradient assist, which makes it easier to push the dish rack 2 back inward.

[0049] The driving member 45 is a motor and is located outside the box 1. One end of the driving rod 44 passes through the box 1 and is connected to the motor, and the other end is connected to the corresponding wheel axle 41. The driving member 45 does not occupy the space inside the box 1.

[0050] In this embodiment, the side walls of the box body 1 are provided with through holes at the corresponding rear roller assembly 4 and the front roller assembly 4, and the outer side and / or inner side of the through holes are provided with reinforcing plates 40. For the rear roller assembly 4, the driving rod 44 passes through the corresponding through hole and is connected to the driving member 45; for the front roller assembly 4, the wheel axle 41 passes through the corresponding through hole and is fixedly connected with the screw 43.

[0051] Example 2

[0052] like Figure 9 、 10 As shown, the difference between Example 2 and Example 1 is that the roller assembly 4 of this embodiment further includes an inner sleeve 46 , a positioning sleeve 47 and a ball 48 .

[0053] An inner sleeve 46 is provided between the axle 41 and the roller 42 , and a rotatable ball 48 is provided between the inner sleeve 46 and the roller 42 . There are a plurality of balls 48 , which are spaced apart along the circumference of the inner sleeve 46 .

[0054] Specifically, a positioning sleeve 47 is provided between the inner sleeve 46 and the roller 42. The centerline of the positioning sleeve 47 is aligned with the axis of the axle 41, and the positioning sleeve 47 is fixed relative to the roller 42. The positioning sleeve 47 is provided with a plurality of positioning holes 471 along its circumference, into which the balls 48 are placed in a one-to-one correspondence. Each positioning hole 471 extends through the end wall of one end of the positioning sleeve 47 to form an entrance 472. The balls 48 enter the positioning holes 471 through the entrance 472. The entrance 472 of the positioning holes 471 is tapered in a gradually decreasing diameter as the balls 48 enter the positioning holes 471. The tapered structure serves as a guide, facilitating the placement of the balls 48 in the corresponding positioning holes 471. The positioning sleeve 47 evenly spaces the balls 48, ensuring smooth rotation of the roller 42. The positioning sleeve 47 also positions the balls 48, preventing them from deviating from the roller 42 or the inner sleeve 46 and affecting the normal rotation of the roller assembly 4.

[0055] The positioning sleeve 47 and the roller 42 may be welded together, or a circle of ribs 473 may be provided on the outer peripheral wall of the positioning sleeve 47, and when the positioning sleeve 47 is located between the roller 42 and the inner sleeve 46, the ribs 473 and the inner peripheral wall of the roller 42 have an interference fit; or a circle of ribs 473 may be provided on the inner peripheral wall of the roller 42, and when the positioning sleeve 47 is located between the roller 42 and the inner sleeve 46, the ribs 473 and the roller 42 have an interference fit.

[0056] A first arcuate groove 461 is provided on the outer peripheral wall of the inner sleeve 46 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 toward the axis away from the wheel axle 41. The first arcuate groove 461 is partially embedded in the ball 48, and the second arcuate groove 421 is partially embedded in the ball 48.

[0057] The radius of the first arcuate groove 461 is R1, and the radius of the ball 48 is r, where R1>r. The center of the first arcuate groove 461 is located outside the center of the ball 48, with "outside" referring to a direction away from the axis of the axle 41. This reduces the contact area between the ball 48 and the first arcuate groove 461, thereby reducing rotational friction.

[0058] The radius of the second arcuate groove 421 is R2, and the radius of the ball 48 is r, where R2>r. The center of the second arcuate groove 421 is located inside the center of the ball 48, with "inside" referring to the direction closer to the axis of the axle 41. This reduces the contact area between the ball 48 and the second arcuate groove 421, thereby reducing rotational friction.

[0059] When the guide rail 3 moves, the roller 42 rotates, and rolling friction is formed between the roller 42 and the inner sleeve 46 through the ball 48. The friction force 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.

[0060] What is shown in the figure is a cross-sectional view of the front roller assembly 4 . The rear roller assembly 4 can also adopt this structure, except that its wheel axle 41 needs to be connected to the driving rod 44 .

[0061] 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; Roller assembly (4), including A wheel axle (41) is 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); It is characterized by: 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 wheel axles (41) of at least one group of roller assemblies (4) are movable, so that the wheel axles (41) of one group of roller assemblies (4) can be moved until their axes are located above or below the axes of the wheel axles (41) of the other group of roller assemblies (4).

2. The household appliance according to claim 1, wherein: One of the wheel axles (41) is connected to a driving rod (44), and the driving rod (44) is drivingly connected to a driving member (45), so that the driving rod (44) can rotate around its axis. The driving rod (44) extends in a left-right direction, and the axis of the driving rod (44) and the axis of the wheel axle (41) are at different heights.

3. The household appliance according to claim 2, wherein: The wheel shaft (41) of the roller assembly (4) located at the rear side is connected to the driving rod (44), and the wheel shaft (41) of the roller assembly (4) located at the front side is fixed relative to the box body (1).

4. The household appliance according to claim 1, wherein: When the guide rail (3) moves forward, the wheel axle (41) of the roller assembly (4) at the rear side is higher than the wheel axle (41) of the roller assembly (4) at the front side; when the guide rail (3) moves backward, the wheel axle (41) of the roller assembly (4) at the rear side is lower than the wheel axle (41) of the roller assembly (4) at the front side.

5. The household appliance according to any one of claims 1 to 4, characterized in that: An inner sleeve (46) sleeved on the wheel axle (41) is provided between the wheel axle (41) and the roller (42). Rotatable balls (48) are provided between the inner sleeve (46) and the roller (42). A plurality of balls (48) are provided and spaced apart along the circumference of the inner sleeve (46).

6. The household appliance according to claim 5, characterized in that: The outer peripheral wall of the inner sleeve (46) is provided with a first arc-shaped groove (461) 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 (461) is for partially embedding the ball (48), and the second arc-shaped groove (421) is for partially embedding the ball (48).

7. The household appliance according to claim 6, characterized in that: The radius of the first arcuate groove (461) is R1, the radius of the ball (48) is r, R1>r, and the center of the first arcuate groove (461) is located outside the center of the ball (48); the radius of the second arcuate groove (421) is R2, the radius of the ball (48) is r, R2>r, and the center of the second arcuate groove (421) is located inside the center of the ball (48).

8. The household appliance according to claim 5, wherein: A positioning sleeve (47) is further provided between the inner sleeve (46) and the roller (42). The center line of the positioning sleeve (47) is in the same extension direction as the axis of the wheel shaft (41). The positioning sleeve (47) is fixed relative to the roller (42). The positioning sleeve (47) is provided with a plurality of positioning holes (471) along its circumference for the balls (48) to be placed therein in a one-to-one correspondence.

9. The household appliance according to any one of claims 1 to 4, characterized in that: A 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 a positioning portion (31) that can abut against the sliding member (21).

10. The household appliance according to any one of claims 1 to 4, characterized in that: The household appliance is a washing machine capable of washing dishes and / or fruits and vegetables.

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