A washing machine damping balance integrated injection molding part with pre-positioning buffer structure

Abstract

The utility model discloses a kind of washing machine damping balance integrated injection molding parts with pre-positioning buffer structure, comprising: main body injection base, pre-positioning boss, buffer groove, damping support rib, balance counterweight cavity, installation positioning hole, connecting buckle, anti-skid line, drainage guide groove and edge reinforcing rib, wherein: main body injection base is plate structure;Pre-positioning boss is arranged on the central surface of main body injection base.The utility model compared with prior art, the beneficial effects of the utility model are: the main body injection base, pre-positioning boss, buffer groove, damping support rib, balance counterweight cavity, installation positioning hole, connecting buckle, anti-skid line, drainage guide groove and edge reinforcing rib of the present device are all one injection molding process one forming, material selects polypropylene (PP) or thermoplastic elastomer (TPE) modified composite material, with good impact resistance, fatigue resistance and dimensional stability.

Description

Technical Field

[0001] This utility model relates to the technical field of washing machine parts, specifically to an integrated injection molded part for vibration reduction and balancing of a washing machine with a pre-positioning buffer structure. Background Technology

[0002] Washing machines generate significant vibrations and unbalanced forces during high-speed spin-drying. To ensure operational stability, vibration damping and balancing devices are typically required. Current washing machines often employ counterweights, springs, or dampers to suppress vibrations and achieve drum balance. Some designs integrate vibration damping and balancing functions into a single injection-molded component, simplifying assembly and improving structural compactness. These integrated injection-molded components are generally installed at the bottom or side of the washing machine's outer drum. Through the synergistic effect of their mass distribution and elastic properties, they absorb vibration energy and compensate for unbalanced moments caused by eccentric clothing.

[0003] However, existing integrated injection molded parts lack an effective pre-positioning structure during installation, which requires repeated adjustments to align the position with the fixed holes or mating surfaces during assembly, affecting assembly efficiency. At the same time, during transportation or initial operation, the injection molded parts and the outer barrel may have rigid contact due to the lack of buffering, which may lead to local stress concentration or abnormal noise. Therefore, there is still room for improvement in terms of assembly convenience and operational stability. Utility Model Content

[0004] The purpose of this invention is to provide an integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated injection-molded washing machine vibration damping and balancing component with a pre-positioning buffer structure, comprising: a main injection-molded base, a pre-positioning boss, a buffer groove, a vibration damping support rib, a balance counterweight cavity, a mounting positioning hole, a connecting buckle, anti-slip texture, a drainage guide groove, and edge reinforcing ribs, wherein: The main injection molding base has a plate-like structure; a pre-positioning boss is located in the center of the upper surface of the main injection molding base; a buffer groove is opened on the upper surface of the main injection molding base and surrounds the pre-positioning boss; a vibration damping support rib is located on the lower surface of the main injection molding base; a balance counterweight cavity is located inside the main injection molding base; mounting positioning holes are opened in the corner areas of the main injection molding base; connecting buckles are located on the sides of the main injection molding base; anti-slip texture is located on the upper surface of the main injection molding base; a drainage guide groove is opened at the edge of the lower surface of the main injection molding base; and edge reinforcing ribs are set along the outer contour of the main injection molding base.

[0006] Preferably, the buffer grooves are elliptical or waist-shaped recesses, and there are four, six or eight of them, arranged in a ring array around the prepositioned boss.

[0007] Preferably, the vibration damping support ribs are arranged radially or in a grid pattern, with a triangular or trapezoidal cross-section and a height of four to seven millimeters.

[0008] Preferably, the counterweight cavity is a closed or semi-closed cavity located near the center of gravity of the main injection-molded base, with a cavity wall thickness of two to five millimeters.

[0009] Preferably, the connecting buckle includes an elastic arm and a hook. One end of the elastic arm is integrally connected to the side wall of the main injection-molded base, and the other end is bent upward to form a hook facing the center.

[0010] Preferably, the anti-slip texture is a wave-shaped, diamond-shaped, or dot-matrix raised pattern, with a raised height of 0.3 mm to 0.8 mm, covering more than 60% of the upper surface area.

[0011] Preferably, the drainage channel has a U-shaped or V-shaped cross section, a depth of 1.5 mm to 3 mm, a width of 3 mm to 6 mm, and a drainage outlet that connects to the lowest point of the main injection molding base.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: The main injection-molded base, pre-positioning boss, buffer groove, vibration-damping support rib, balance counterweight cavity, mounting positioning hole, connecting buckle, anti-slip texture, drainage guide groove, and edge reinforcing ribs are all formed in one injection molding process. The material used is polypropylene (PP) or thermoplastic elastomer (TPE) modified composite material, which has good impact resistance, fatigue resistance, and dimensional stability. The position, quantity, size, and interrelationship of each structural feature have been optimized through finite element simulation to ensure optimal vibration reduction and balance while meeting strength requirements. The overall dimensions of the injection-molded parts are adapted to the washing machine model, with a length range of 150 mm to 300 mm and a width range of 100 mm to 250 mm. The height of the pre-positioning boss matches the depth of the outer drum positioning hole, with a tolerance controlled within ±0.2 mm. The depth of the buffer groove and the height of the vibration-damping support rib are designed according to the expected load spectrum to ensure no plastic deformation occurs at maximum operating speed. The maximum deflection of the elastic arm of the connecting buckle during assembly shall not exceed 80% of its material yield strength, ensuring long-term reliability. Attached Figure Description

[0013] Figure 1 This is a top view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model from a bottom view; Figure 3 This is a schematic diagram of the internal structure of the injection-molded base of the main body of this utility model.

[0014] In the figure: 1. Main injection molded base; 2. Pre-positioning boss; 3. Buffer groove; 4. Vibration damping support rib; 5. Balance counterweight cavity; 6. Mounting positioning hole; 7. Connecting buckle; 8. Anti-slip texture; 9. Drainage guide channel; 10. Edge reinforcing rib. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1 to 3 One embodiment of this utility model is a washing machine vibration damping and balancing integrated injection molded part with a pre-positioning buffer structure, comprising: a main injection molding base 1, a pre-positioning boss 2, a buffer groove 3, a vibration damping support rib 4, a balance counterweight cavity 5, a mounting positioning hole 6, a connecting buckle 7, anti-slip texture 8, a drainage guide groove 9, and an edge reinforcing rib 10.

[0017] The main injection molding base 1 constitutes the basic load-bearing structure of the entire injection molded part. It is approximately rectangular in shape, with its upper surface serving as the support surface that contacts the bottom of the washing machine's outer drum, and its lower surface as the mounting surface that mates with the washing machine's base. The thickness of the main injection molding base 1 ranges from five millimeters to twelve millimeters, with localized thickening or thinning designs depending on the stress area to balance strength and material conservation. Edge reinforcing ribs 10 are provided at each of the four corners of the main injection molding base 1. These ribs extend along the outer contour of the main injection molding base 1, have a trapezoidal cross-section, and a height of three to six millimeters. They are used to enhance the overall structural rigidity and prevent warping deformation during the injection molding process.

[0018] A pre-positioning boss 2 is provided in the central area of ​​the upper surface of the main injection molding base 1. The pre-positioning boss 2 is a cylindrical protrusion with a flat top end face, a diameter of 20 mm to 35 mm, and a height of 5 mm to 8 mm. The central axis of the pre-positioning boss 2 is perpendicular to the upper surface of the main injection molding base 1. It is used to insert into the corresponding positioning hole at the bottom of the washing machine outer drum during assembly to achieve initial alignment and avoid subsequent bolt failure or buckle failure due to misalignment. The outer peripheral wall of the pre-positioning boss 2 is chamfered to facilitate guidance during insertion.

[0019] Multiple buffer grooves 3 are formed on the upper surface of the main injection molding base 1 around the pre-positioned boss 2. The buffer grooves 3 are arranged in a ring array, each being an elliptical or waist-shaped recess with a depth of two to four millimeters and extending radially along its length. The bottom wall thickness of the buffer groove 3 is thinner than other areas of the main injection molding base 1, forming a flexible area that undergoes elastic deformation when subjected to impact loads from the outer cylinder, absorbing some vibration energy and reducing the vibration amplitude transmitted to the base. The number of buffer grooves 3 is four, six, or eight, evenly distributed to ensure force symmetry.

[0020] Multiple vibration-damping support ribs 4 are provided on the lower surface of the main injection-molded base 1. These ribs are arranged radially or in a grid pattern, extending from the central area outwards. They have triangular or trapezoidal cross-sections and a height of four to seven millimeters. The top of each vibration-damping support rib 4 is integrally connected to the lower surface of the main injection-molded base 1, while the bottom is a free end for contacting the corresponding support surface of the washing machine base. When the washing machine vibrates vertically during operation, the vibration-damping support ribs 4 bend and deform. The inherent damping characteristics of the material dissipate the vibration energy, and the structural layout disperses stress concentration, preventing localized cracking.

[0021] The main injection molding base 1 has at least one counterweight cavity 5 inside. The counterweight cavity 5 is a closed or semi-closed cavity structure located near the center of gravity of the main injection molding base 1. The cavity shape is circular, square, or polygonal, and the cavity wall thickness is two to five millimeters. After injection molding, metal particles, high-density resin, or liquid counterweight material can be filled into the counterweight cavity 5 through the injection port. After curing, this creates a localized increase in mass, used to adjust the mass distribution of the entire injection molded part, so that the centrifugal forces generated under rotational conditions cancel each other out, thereby reducing overall machine shaking. The injection port of the counterweight cavity 5 is sealed by heat sealing or by embedding a sealing plug after filling.

[0022] Mounting and positioning holes 6 are respectively provided at the four corners of the main injection molding base 1. The mounting and positioning holes 6 are through holes with a diameter of eight to twelve millimeters, used to pass bolts or screws to fix the injection molded part to the washing machine base. The edges of the mounting and positioning holes 6 are provided with countersunk structures or chamfers to facilitate the fit of the fastener heads. Some mounting and positioning holes 6 have internal threads on their inner walls, which can be directly screwed into the screws, eliminating the need for nuts.

[0023] Multiple connecting clips 7 are provided on the side of the main injection-molded base 1. Each connecting clip 7 consists of an elastic arm and a hook. One end of the elastic arm is integrally connected to the side wall of the main injection-molded base 1, and the other end extends outward and bends upward to form a hook. The hook face faces the center of the main injection-molded base 1 and is used to engage with the corresponding slot on the washing machine base during assembly, enabling quick, tool-free installation. Two to four connecting clips 7 are symmetrically arranged on opposite sides to ensure stability after assembly. The elastic arm is 10 to 20 millimeters long and 1.5 to 3 millimeters thick, ensuring sufficient elasticity and reset capability.

[0024] On the upper surface of the main injection-molded base 1, excluding the pre-positioning boss 2 and the buffer groove 3, anti-slip texture 8 is provided. The anti-slip texture 8 is a continuous wave-shaped, diamond-shaped, or dot-matrix raised pattern, with a raised height of 0.3 mm to 0.8 mm, covering an area of ​​more than 60% of the total area of ​​the upper surface. The anti-slip texture 8 increases the coefficient of friction with the bottom of the washing machine's outer drum, preventing relative slippage during transportation or operation.

[0025] A drainage channel 9 is formed on the lower surface edge of the main injection molding base 1. The drainage channel 9 extends along the circumference or a partial arc of the main injection molding base 1, with a U-shaped or V-shaped cross-section, a depth of 1.5 mm to 3 mm, and a width of 3 mm to 6 mm. The drainage channel 9 connects to the lowest point of the main injection molding base 1 and is provided with a drainage outlet to guide any condensate or splash water that may accumulate to a designated path for discharge, preventing moisture retention that could lead to mold growth or corrosion of metal parts.

[0026] The edge reinforcing ribs 10 are located not only at the four corners of the main injection molding base 1, but also extend continuously along the long and short sides, forming a closed or semi-closed frame structure. The outer sidewall of the edge reinforcing rib 10 is flush with the sidewall of the main injection molding base 1, while the inner sidewall slopes towards the center, forming a reinforcing slope. This structure not only improves the bending resistance of the edges, but also facilitates mold demolding.

[0027] In the actual assembly process, the injection-molded part of this utility model is first placed in the predetermined installation position of the washing machine base. The connecting buckle 7 is aligned with the slot on the base, and pressed down to make the hook embed into the slot, completing the initial fixation. Then, the pre-positioning boss 2 is inserted into the positioning hole at the bottom of the outer drum to achieve precise alignment of the upper and lower parts. Next, the bolt is passed through the mounting positioning hole 6 and tightened to complete the final fastening. When the washing machine is spinning, the vibration of the outer drum is transmitted through the main injection-molded base 1. The buffer groove 3 undergoes local elastic compression, and the vibration damping support rib 4 undergoes bending deformation. The two work together to dissipate vibration energy. At the same time, the counterweight material in the balance counterweight cavity 5 dynamically adjusts the mass distribution according to the rotation direction to suppress the generation of unbalanced torque. The anti-slip texture 8 ensures that there is no relative displacement between the outer drum and the injection-molded part. The drainage guide 9 drains any possible moisture in time to maintain a dry internal environment.

[0028] The main injection-molded base 1, pre-positioning boss 2, buffer groove 3, vibration damping support rib 4, balance counterweight cavity 5, mounting positioning hole 6, connecting buckle 7, anti-slip texture 8, drainage guide groove 9, and edge reinforcing rib 10 are all molded in one piece using the same injection molding process. The material is polypropylene (PP) or thermoplastic elastomer (TPE) modified composite material, which has good impact resistance, fatigue resistance, and dimensional stability. The position, quantity, size, and interrelationship of each structural feature have been optimized through finite element simulation to ensure optimal vibration damping and balance while meeting strength requirements.

[0029] The overall dimensions of the injection-molded parts are adapted to the washing machine model, with a length ranging from 150 mm to 300 mm and a width ranging from 100 mm to 250 mm. The height of the pre-positioning boss 2 matches the depth of the outer drum positioning hole, with a tolerance controlled within ±0.2 mm. The depth of the buffer groove 3 and the height of the vibration damping support rib 4 are designed according to the expected load spectrum to ensure no plastic deformation occurs at maximum operating speed. The maximum deflection of the elastic arm of the connecting buckle 7 during assembly does not exceed 80% of its material yield strength, ensuring long-term reliability.

[0030] During the injection molding process, cooling water channels are provided in the areas of the mold cavity corresponding to the buffer groove 3 and the vibration damping support rib 4 to control the local cooling rate and reduce internal stress; the injection port of the balance counterweight cavity 5 avoids the high stress area to prevent it from becoming a crack source; the mold surface of the anti-slip texture 8 is treated by sandblasting or etching to ensure replication accuracy; the corners of the edge reinforcing rib 10 adopt a large rounded corner transition to avoid stress concentration.

[0031] The injection-molded part is typically installed between the bottom of the outer drum and the base bracket in the washing machine. It is screwed to the base through four mounting positioning holes 6, while the connecting clips 7 on both sides engage with the side walls of the base, forming a double fixation. The pre-positioning boss 2 mates with the metal positioning sleeve at the bottom of the outer drum, with the gap controlled between 0.1 mm and 0.3 mm, ensuring smooth assembly while limiting radial displacement. The free end of the vibration damping support rib 4 has an initial gap of 0.5 mm to 1.5 mm between it and the base support surface. It is not under stress when static, and only contacts and participates in vibration damping when the vibration amplitude exceeds the threshold, extending its service life.

[0032] The outlet of the drain channel 9 faces the drain hole of the washing machine base to ensure smooth water drainage and prevent backflow into the injection molded parts. The pattern density of the anti-slip texture 8 is higher in the area near the pre-positioned boss 2 to enhance the friction in key contact areas. The balance counterweight cavity 5 can be filled with counterweight material or with materials of different densities to accommodate different unbalanced masses, depending on the needs of different models.

[0033] All structural features are parametrically designed using 3D modeling software, and mold flow analysis is used to verify the uniformity of filling, warpage, and weld line location, ensuring a yield rate of over 98% for injection molded parts. Finished injection molded parts must pass drop tests, fatigue tests, and high / low temperature cycling tests to verify their structural integrity and functional stability under various operating conditions.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vibration damping and balancing integrated injection molded part for a washing machine with a pre-positioning buffer structure, characterized in that, include: The main injection-molded base (1), pre-positioning boss (2), buffer groove (3), vibration damping support rib (4), counterweight cavity (5), mounting positioning hole (6), connecting buckle (7), anti-slip texture (8), drainage guide groove (9), and edge reinforcing rib (10), wherein: The main injection molding base (1) has a plate-like structure; the prepositioning boss (2) is located in the center of the upper surface of the main injection molding base (1); the buffer groove (3) is opened on the upper surface of the main injection molding base (1) and surrounds the prepositioning boss (2); the vibration damping support rib (4) is located on the lower surface of the main injection molding base (1); the balance counterweight cavity (5) is located inside the main injection molding base (1); the mounting positioning hole (6) is opened in the corner area of ​​the main injection molding base (1); the connecting buckle (7) is located on the side of the main injection molding base (1); the anti-slip texture (8) is located on the upper surface of the main injection molding base (1); the drainage guide groove (9) is opened on the edge of the lower surface of the main injection molding base (1); the edge reinforcing rib (10) is set along the outer contour of the main injection molding base (1).

2. The integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure according to claim 1, characterized in that: The buffer groove (3) is an elliptical or waist-shaped recess, and there are four, six or eight of them, which are arranged in a ring array around the prepositioned boss (2).

3. The integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure according to claim 1, characterized in that: The vibration damping support ribs (4) are arranged radially or in a grid pattern, with a triangular or trapezoidal cross section and a height of four to seven millimeters.

4. The integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure according to claim 1, characterized in that: The counterweight cavity (5) is a closed or semi-closed cavity located near the center of gravity of the main injection molding base (1), with a cavity wall thickness of two to five millimeters.

5. The integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure according to claim 1, characterized in that: The connecting buckle (7) includes an elastic arm and a hook. One end of the elastic arm is integrally connected to the side wall of the main injection molding base (1), and the other end is bent upward to form a hook facing the center.

6. The integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure according to claim 1, characterized in that: The anti-slip texture (8) is a wave-shaped, rhomboid, or dot-matrix raised pattern with a raised height of 0.3 mm to 0.8 mm, covering more than 60% of the upper surface area.

7. The integrated injection molded part for vibration damping and balancing of a washing machine with a pre-positioning buffer structure according to claim 1, characterized in that: The drainage channel (9) has a U-shaped or V-shaped cross section, a depth of 1.5 mm to 3 mm, a width of 3 mm to 6 mm, and a drainage outlet connected to the lowest point of the main injection molding base (1).

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