WO2018049806A1

WO2018049806A1 - Method for optimizing arrangement of strengthening rib of side plate, side plate, and washing machine having the side plate

Info

Publication number: WO2018049806A1
Application number: PCT/CN2017/078607
Authority: WO
Inventors: 杨阳; 韩雷; 黄浩钦; 陈楠; 范兴发
Original assignee: 珠海格力电器股份有限公司
Priority date: 2016-09-19
Filing date: 2017-03-29
Publication date: 2018-03-22
Also published as: CN106283544B; CN106283544A

Abstract

The invention relates to the field of washing machines. Provided are a method for optimizing an arrangement of strengthening ribs of a side plate, a side plate, and a washing machine having the side plate. The invention aims to provide an optimization method for obtaining an optimal strengthening rib layout, a side plate having an improved natural frequency characteristic and high rigidity, and a washing machine having low vibration amplitude and noise. The method for optimizing an arrangement of strengthening ribs of a side plate comprises: performing modal analysis on a model of a side plate; performing topography optimization on the side plate to reinforce a rib layout and obtain an optimized side plate model having the optimal arrangement of strengthening ribs; and performing verification to determine whether the optimized side plate model meets design requirements. Applying a side plate obtained by the above method in a washing machine solves problems of insufficient static and dynamic rigidity and resonance, and effectively mitigates a problem in which distortion of a side plate occurs in a process of delivering a washing machine or when a washing machine falls over.

Description

Optimization method for edge plate rib distribution, edge plate and washing machine having the same

Related application

The present invention claims the priority of the Chinese patent application entitled "Side plate rib distribution optimization method, side plate and washing machine having the side plate" which is applied for on September 19, 2016, and the application number is 201610834690.X. This is incorporated by reference in its entirety.

Technical field

The invention relates to the field of washing machines, in particular to a method for optimizing the distribution of side ribs, a side plate and a washing machine having the same.

Background technique

When the washing machine is working, especially when it is dehydrating, the cylinder rotates at a high speed, which is easy to cause the vibration displacement of the side plate to be too large, exceeding the requirements of the national standard. When the side plate fixed frequency and the highest dehydration speed are close to the vibration excitation frequency point of the washing machine suspension system, that is, it is basically in the resonance point area, it will cause large vibration. Generally, the washing machine side plate fixed frequency is about +-5 Hz at the vibration excitation frequency point of the washing machine suspension system, that is, the side plate solid frequency is at least lower than the vibration excitation frequency point 5 Hz, or the side plate solid frequency is at least higher than the vibration excitation frequency point 5 Hz, so The side plates are required to have a suitable solid frequency to avoid resonance and require sufficient static stiffness, dynamic stiffness and good resistance to deformation.

At present, the shape of the side plate of the washing machine is mostly processed by pressing to form the ribs to strengthen the rigidity of the side slab. However, the traditional squash rib distribution mainly depends on experience. Under normal circumstances, the gluten distribution obtained by experience sometimes cannot meet the requirements. The design requirements, sometimes meeting the design requirements, are not optimal for the rib layout, and there is a certain amount of reinforcement for the edge plate stiffness.

Summary of the invention

Based on this, it is necessary to provide a method for optimizing the distribution of the side squeezing ribs and the method for optimizing the distribution of the ribs according to the edge squeezing ribs. A highly rigid side panel with an optimal rib layout and a washing machine using this side panel.

A side panel comprising a main panel and a pressing rib disposed on the main panel, wherein the pressing rib comprises an upper pressing rib, a middle pressing rib and a lower pressing rib; the upper pressing rib comprises a vertical center line about the main panel Two sets of upper ribs are arranged symmetrically, and each set of upper ribs is inclined along the diagonal direction of the main panel, and each set of upper ribs includes a plurality of strip-shaped upper ribs arranged in parallel; the middle rib includes symmetry a graphic pressing rib, the symmetry line of the symmetrical graphic pressing rib coincides with a vertical center line of the main panel; the lower pressing rib comprises two sets of downward rib pressing symmetrically arranged about a vertical center line of the panel, and each set of lower rib pressing ribs It is inclined along the diagonal direction of the main panel, and each set of lower pressing ribs includes a plurality of strip-shaped lower pressing ribs arranged in parallel.

In one embodiment, each set of lower ribs comprises four strip-shaped lower ribs, one of the two sets of lower ribs between the top of the strip-shaped lower ribs and the bottommost strip The top ends of the ribs are connected by curved transverse ribs.

In one embodiment, each set of upper ribs includes two strip-shaped upper ribs.

In one embodiment, the symmetrical pattern pressing rib of the middle pressing rib is a diamond rib, and the concentric first curved intermediate rib is connected at the lower corner of the diamond rib.

In one embodiment, the symmetrical graphic pressing rib of the middle pressing rib is a circular rib, and the second curved rib is respectively disposed above and below the circular rib with two second curved crosses concentric with the circular pressing rib Reinforcement.

In one embodiment, the symmetrical graphic rib of the middle rib is a circular rib, and each set of upper ribs of the upper rib includes four strip-shaped upper ribs, and two sets of upper ribs Between the top of the top ribs at the top and the top of the ribs at the bottom, respectively, are connected by curved transverse ribs, the upper ribs and the lower ribs being horizontal with respect to the main panel The center line is symmetrically set.

A method for optimizing the distribution of side squeezing ribs, comprising the steps of:

(a) Perform modal analysis on the original model of the edge plate to obtain the first-order fixed frequency f10 and the second-order fixed frequency f20 of the original model of the edge plate;

(b) Optimizing the shape of the rib layout on the side plate, obtaining the rib deformation distribution map and the first-order fixed frequency f11 and the second-order fixed frequency f21 after the topography optimization;

(c) processing the deformation map of the rib deformation into a geometric figure, and performing secondary treatment according to the requirements of the material forming process to obtain an edge plate optimization model with an optimal rib distribution;

(d) Verification of the effect of the edge plate optimization model. Under the constraint of the assembly state of the box, the modal analysis of the edge plate optimization model is carried out to obtain the first-order fixed frequency f12 of the edge plate optimization model, and the edge plate. The original model is compared with the first-order fixed frequency f22 under the constraint of the assembly state of the box. If the design requirements are met, the optimization is ended. If the design requirements are not met, the step (b) is returned.

In one embodiment, the modal analysis is performed by the HyperMesh software in the step (a).

In one embodiment, the topography is optimized in step (b) by OptiStruct software.

In one embodiment, in step (b), the design area and the non-design area of the original model of the side panel are divided, and the parameters of the reinforcement rib and the reinforcement method are set, and the first step is fixed under the constraint of the single edge plate. The frequency is maximized to optimize the target, and the original model of the sideboard is reinforced.

In one embodiment, the non-designed area is a side panel bending zone and a screw mounting zone.

A side panel comprising a main panel and a pressing rib disposed on the main panel, wherein the shape of the pressing rib is obtained by the above-mentioned optimization method of the rib pressing distribution.

A washing machine comprising the above-mentioned side panels.

The edge plate has the optimal rib layout, and the solid frequency characteristics and the rigidity are improved, and the static rigidity, the dynamic stiffness and the resonance problem of the washing machine side plate are solved, the vibration of the washing machine side plate is reduced, and the washing machine side plate vibrates. Improvement zone The noise level of the washing machine has been improved, and the static rigidity and dynamic stiffness of the washing machine are improved, so that the problem of the deformation of the side plate during the transportation of the product and the falling of the product is well improved.

The above-mentioned method for optimizing the distribution of the side squeezing ribs optimizes the distribution of the ribs of the slab by the morphological optimization technique, breaks the limitation of the reinforced rib distribution by empirical design, reduces the judgment error caused by human factors, and can effectively obtain the edge. The optimal rib layout of the plate increases the rigidity of the slab and meets the requirements of the deviation from the resonance zone.

DRAWINGS

In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

1 is a schematic structural view of an original model of a side panel according to the present invention;

2 is a distribution diagram of deformation of a rib obtained in the step (b) of the method for optimizing the distribution of the side squeezing ribs of the present invention;

3 is a schematic structural view of a side panel A in a side panel of the present invention;

4 is a schematic structural view of a side panel B in a side panel of the present invention;

Figure 5 is a schematic view showing the structure of the side panel C in the side panel of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

As shown in Fig. 1, it is a primary side plate model provided with vertical reinforcing ribs.

The method for optimizing the edge rib distribution of the invention comprises the following steps:

(a) modal analysis of the original model of the edge plate by HyperMesh software, the first-order fixed frequency f10 and the second-order fixed frequency f20 of the original model of the edge plate are obtained;

(b) dividing the design area and the non-design area of the original model of the side panel, the design area is the main plane area of the panel, the non-design area is the side edge bending edge and the screw installation area; and the parameters of the reinforcement rib and the reinforcement method are set, The structural parameters are: rib height 5mm, rib width 5mm～30mm, stamping angle 45°～60°, rib pattern distribution is symmetric distribution of inner concave ribs; under the constraint of single side plate, the first step solid frequency maximization is the optimization target Through the OptiStruct software, the shape optimization of the rib layout of the edge plate is obtained, and the rib deformation distribution map as shown in FIG. 2 and the first-order fixed frequency f11 and the second-order fixed frequency f21 after the topography optimization are obtained;

(c) processing the embossed deformation distribution cloud image into a geometric figure, and performing secondary pattern processing according to the material forming process requirement to obtain an edge plate optimization model with an optimal rib distribution;

When judging whether the design requirement is met in the step (d), the first-order fixed-frequency f10 and the second-order fixed-frequency f20 of the original model of the edge plate and the first-order fixed-frequency f11 and the second-order optimized by the topography respectively are required. Corresponding to the comparison of the fixed frequency f21 and the constraint of the assembly state of the box, comparing the first-order fixed frequency f12 of the edge plate optimization model with the first-order fixed frequency f13 of the original model of the edge plate under the constraint of the assembly state of the box, To determine whether the stiffness of the edge panel is optimized. At the same time, it is necessary to compare the first solid frequency of the edge plate optimization model under the constraint of the assembly state of the box with the vibration excitation frequency point of the washing machine suspension system to determine whether the edge plate optimization model satisfies the vibration requirement. The first fixed frequency f11 and the second fixed frequency f21 of the edge plate optimized by the shape of the single edge are larger, and the first fixed frequency f12 is larger under the constraint of the assembly state of the side plate. The stiffness of the edge plate optimization model is improved; the first solid frequency of the edge plate optimization model is not in the resonance region of the vibration of the washing machine system under the constraint of the assembly state of the box, and the vibration requirement is satisfied; only the rigidity and vibration of the edge plate satisfy the requirements. When the design requirements are met.

A side panel comprises a main panel and a pressing rib disposed on the main panel, and the shape of the pressing rib is obtained by the above-mentioned optimization method of the rib pressing distribution.

In one embodiment, as shown in FIG. 3, a schematic view of the rib shape of the side panel A is shown. The rib of the side panel A includes an upper rib, a middle rib and a lower rib; the upper rib includes two sets of upper ribs symmetrically arranged about a vertical center line of the main panel, and each set of upper ribs along the main panel The angle direction is inclined, each set of upper ribs includes two strip-shaped upper ribs 110 arranged in parallel; the middle ribs include diamond-shaped ribs 210, it should be noted that the diamond-shaped ribs 210 are monolithic. In the form of ribs, the symmetry line of the diamond rib 210 coincides with the vertical center line of the main panel, and the concentric first curved intermediate rib 220 is connected at the lower corner of the diamond rib 210; the lower rib includes the panel vertical Two sets of lower ribs are arranged symmetrically on the center line, and each set of lower ribs is inclined along the diagonal direction of the main panel, and each set of lower ribs includes four strip-shaped lower ribs 310 arranged in parallel, two groups under Among the diagonal ribs, between the top end of the strip-shaped lower ribs at the top and the top end of the strip-shaped lower ribs at the bottom are respectively connected by the curved lower ribs 320.

According to the washing machine, the highest dehydration speed is 1400 rpm/23.33 Hz, that is, the vibration excitation frequency point of the washing machine suspension system is 23.33 Hz. Generally, the washing machine side plate fixed frequency is lower than 18.33 Hz or higher than 28.33 Hz. Under the constraint of a single edge plate, the first-order fixed frequency f10 of the original model of the edge plate is 15.97 Hz and the second-order fixed frequency f20 is 28.11 Hz, while the first-order fixed frequency f11 after the topography optimization rises to 21.817 Hz and the first The second-order fixed-frequency f21 rises to 34.065Hz, and the shape-optimized edge-plate solid-frequency is improved by nearly 6Hz compared with the original model of the edge plate, and the stiffness of the edge plate is improved. Under the constraint of the assembly state, the first-order fixed frequency f22 of the original model of the edge plate is 28.7 Hz, and the first-order fixed frequency f12 of the edge plate A is modally analyzed and rises to 32.5 Hz. The stiffness is improved, and the first-order solid-frequency frequency is much higher than the vibration excitation frequency point of the washing machine suspension system of 23.33 Hz. The rigidity of the side panel A is increased, and is far away from the resonance range of the suspension system, and meets the design requirements of the side panel when the washing machine is in operation.

When the reinforced method is changed in the optimization method of the edge plate rib distribution, the symmetrical distribution of the inner rib is replaced by the central area as the radiation. When the rib-like shape + the symmetrical symmetrically distributed concave ribs are optimized by the graphic processing design, the side plate B shown in FIG. 4 and the side plate C shown in FIG. 5 are produced, and the side plate C is based on the side plate B. Derivative optimization layout based on factors such as molding process and cost.

As shown in Fig. 4, the upper pressing rib and the lower pressing rib of the side panel B are respectively the same as the upper pressing rib and the lower pressing rib of the side panel optimization model A, and the upper pressing rib includes two sets of upward slanting symmetrically about the vertical center line of the main panel. The ribs are arranged obliquely along the diagonal direction of the main panel, and each set of upper ribs includes two strip-shaped upper ribs 111 arranged in parallel; the lower ribs include symmetrical settings about the vertical centerline of the panel The two sets of lower ribs are slanted along the diagonal direction of the main panel. Each set of lower ribs includes four strip-shaped lower ribs 311 arranged in parallel, and two sets of lower ribs Between the top of the upper strip-shaped lower ribs and the top of the lowermost strip-shaped ribs are respectively connected by curved lower pressing ribs 321 . The difference is that the middle pressing rib of the side plate B includes the circular pressing rib 211. It should be noted that the circular pressing rib 211 is also in the form of a single piece of embossing, and the symmetrical line of the circular pressing 211 and the main panel are vertical. The straight center lines are coincident, and two second curved intermediate pressing ribs 221 concentric with the circular pressing ribs are respectively disposed above and below the circular pressing ribs 211.

As shown in FIG. 5, the symmetrical pattern pressing rib of the middle rib of the side plate C is also a circular rib, and each set of upper ribs of the upper rib includes four strip-shaped upper ribs 112, and two sets of embossing Between the top of the ribs on the top of the ribs and the top of the ribs on the bottom of the ribs are respectively connected by the curved upper ribs 122, and the lower ribs and the lower part of the side plates A are pressed. The ribs are the same, that is, the lower ribs include two sets of lower ribs symmetrically arranged about the vertical center line of the panel, and each set of lower ribs is inclined along the diagonal direction of the main panel, and each set of lower ribs includes parallel arrangement Four strip-shaped lower pressing ribs 312, between the two sets of lower oblique ribs at the top of the strip-shaped lower pressing ribs and between the topmost strip-shaped lower ribs respectively 322 connection. The upper pressing rib of the side panel C and the lower pressing rib are symmetrically arranged with respect to the horizontal center line of the main panel.

Finally, the side panel is verified and analyzed. Since the side panel C is derived from the side panel B and the shape is substantially similar, it can be verified by the side panel B as a representative.

Table 1 Comparison of the fixed frequency characteristics of different side plates under the constraint of the assembly state of the box

As shown in Table 1, under the constraint of the assembly state of the box, the modal analysis of the original model of the side panel, the edge panel A and the edge panel B can be used to obtain the edge panel A and the edge panel B in different mode modes. The fixed frequency characteristics are higher than the original model of the side plate, and the fixed frequency characteristics of the side plate A and the side plate B are improved.

A washing machine of the present invention comprises the side panel A or the side panel B or the side panel C as described above.

The above-mentioned edge plate obtains the optimal rib layout through the edge plate rib distribution optimization method, and improves the solid frequency characteristics and rigidity, and solves the static stiffness, dynamic stiffness shortage and resonance problem of the washing machine side plate. Washing machine using this sideboard, not only The vibration problem of the washing machine side plate is solved, and the vibration of the washing machine side plate improves the noise level of the washing machine, and the static rigidity and dynamic rigidity of the washing machine side plate increase, so that the washing machine is deformed during product transportation and product falling. The problem has been improved very well.

It is apparent that the above-described embodiments are merely illustrative of the examples, and are not intended to limit the embodiments. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

A side panel comprising a main panel and a pressing rib disposed on the main panel, wherein the pressing rib comprises an upper pressing rib, a middle pressing rib and a lower pressing rib; the upper pressing rib comprises a vertical center line about the main panel Two sets of upper ribs are arranged symmetrically, and each set of upper ribs is inclined along the diagonal direction of the main panel, and each set of upper ribs includes a plurality of strip-shaped upper ribs arranged in parallel; the middle rib includes symmetry a graphic pressing rib, the symmetry line of the symmetrical graphic pressing rib coincides with a vertical center line of the main panel; the lower pressing rib comprises two sets of downward rib pressing symmetrically arranged about a vertical center line of the panel, and each set of lower rib pressing ribs It is inclined along the diagonal direction of the main panel, and each set of lower pressing ribs includes a plurality of strip-shaped lower pressing ribs arranged in parallel.
The side panel according to claim 1, wherein each of the sets of downward ribs comprises four strip-shaped lower ribs, and the top of the two sets of lower ribs is at the top of the strip-shaped lower ribs. Between the top and the bottom of the lower ribs at the bottom, respectively, the curved ribs are connected by arcs.
The side panel according to claim 1, wherein each of the sets of upper ribs comprises two strip-shaped upper ribs.
The side plate according to claim 1, wherein the symmetrical pattern pressing rib of the middle pressing rib is a diamond rib, and the two lower concentric first curved ribs are connected at a lower corner of the diamond rib. .
The side plate according to claim 1, wherein the symmetrical graphic pressing rib of the middle pressing rib is a circular rib, and the circular rib is respectively provided with two concentrics with the circular pressing rib above and below The second curved shape is transversely pressed.
The side plate according to claim 1, wherein the symmetrical pattern pressing rib of the middle pressing rib is a circular rib, and each set of upper rib pressing rib of the upper pressing rib comprises four strip-shaped upper ribs Between the top of the two sets of upper ribs, the top of the upper ribs and the top of the lower ribs are respectively connected by curved transverse ribs, the upper ribs and The lower ribs are symmetrically placed about the horizontal centerline of the main panel.
A method for optimizing the distribution of side squeezing ribs, comprising the steps of:

(a) Perform modal analysis on the original model of the edge plate to obtain the first-order fixed frequency f10 and the second-order fixed frequency f20 of the original model of the edge plate;

(b) Optimizing the shape of the rib layout on the side plate, obtaining the rib deformation distribution map and the first-order fixed frequency f11 and the second-order fixed frequency f21 after the topography optimization;

(c) processing the deformation map of the rib deformation into a geometric figure, and performing secondary treatment according to the requirements of the material forming process to obtain an edge plate optimization model with an optimal rib distribution;

(d) Verification of the effect of the edge plate optimization model. Under the constraint of the assembly state of the box, the modal analysis of the edge plate optimization model is carried out to obtain the first-order fixed frequency f12 of the edge plate optimization model, and the edge plate. The original model is compared with the first-order fixed frequency f22 under the constraint of the assembly state of the box. If the design requirements are met, the optimization is ended. If the design requirements are not met, the step (b) is returned.
The edge plate rib distribution optimization method according to claim 7, wherein the modal analysis is performed by the HyperMesh software in the step (a).
The edge plate rib distribution optimization method according to claim 8, wherein the step (b) is passed Topography optimization with OptiStruct software.
The edge plate rib distribution optimization method according to claim 9, wherein in the step (b), the design area and the non-design area of the original model of the side slab are divided, and the parameters of the rib and the reinforced manner are set. Under the constraint of a single edge plate, the first step of the solid frequency is maximized as the optimization target, and the original model of the edge plate is reinforced.
The edge plate rib distribution optimization method according to claim 10, wherein the non-design area is a side plate bending area and a screw mounting area.
A side panel comprising a main panel and a rib provided on the main panel, wherein the shape of the rib is obtained by the edge rib distribution optimization method according to any one of claims 7-11.
A washing machine comprising the side panel according to any one of claims 1-6 and 12.