Design method of washing machine outer barrel with notch and washing machine

Abstract

The design method is characterized by comprising the following steps that firstly, the notch is formed in at least one side of the outer barrel in the width direction of a machine shell of the washing machine; the tangent plane is parallel to the side face of the machine shell and externally tangent to the inner cylinder; 3, applying loads in three directions of the upper edge, the center and the lower edge of the tangent plane, and simulating to obtain the deformation of the inner drum of the washing machine under the acting force of the loads in the three directions; 4, intersecting the inner barrel with the outer barrel under different deformation amounts to obtain three closed curves; 5, an envelope line is drawn, the three closed curves are internally tangent to the envelope line, and the shape of the minimum notch of the outer barrel is obtained. The method has the advantages that the envelope line shape of the notch of the outer barrel is determined by adopting a method of firstly supplementing and then cutting in combination with simulation software and three-dimensional modeling software, the notch shape of the outer barrel with the minimum perimeter can be obtained, and the strength of the notch of the outer barrel is guaranteed.

Description

Technical Field

[0001] The invention relates to a method for designing an outer barrel of a washing machine, in particular to a method for designing an outer barrel of a washing machine with a cutout and a washing machine. Background Art

[0002] In the prior art, the overall dimensions (length, width and height) of a drum washing machine cannot exceed a certain range due to the installation space in the user's home. A larger inner drum volume plays an important role in improving the washing and drying effects. Therefore, how to obtain a larger inner drum diameter under a fixed washing machine casing size and thus increase the inner drum volume has always been the research direction of the industry.

[0003] The Chinese utility model "A washing machine outer barrel and a drum washing machine using the outer barrel" with the patent number 202222649579.7 previously applied by me discloses a washing machine with an outer barrel cutout, wherein the outer barrel of the washing machine is provided with a cutout on at least one side along the width direction of the washing machine casing, and the cutout is provided with an end cover that can close the cutout, and the end cover is flexibly connected to the outer barrel. The advantage of the utility model is that the outer barrel is cut out with a cutout, so that the size of the outer barrel in the width direction of the casing can be expanded to be equal to the width of the casing, so that the diameter of the inner barrel can be increased to the maximum extent without changing the casing size of the washing machine, and the volume of the inner barrel can be increased, so as to achieve a small volume and a large capacity, and improve the washing and drying effect.

[0004] In order to increase the capacity of the inner cylinder, the above patent adopts the method of opening holes on both sides of the outer cylinder, so that the original safety gaps between the inner cylinder and the outer cylinder and between the outer cylinder and the box body are converted into only a safety gap between the inner cylinder and the box body.

[0005] However, opening holes on both sides of the outer barrel will weaken the strength of the entire outer barrel, causing disturbances in the inner barrel and increased vibration of the outer barrel. In more serious cases, it will even damage the outer barrel. Therefore, the shape and size range of the openings on both sides of the outer barrel are of great significance to the strength of the outer barrel and the mutual influence between the outer barrel and the shell. How to open the cutouts on both sides of the outer barrel is one of the problems that this type of washing machine needs to solve urgently. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a design method for a washing machine outer drum with a minimum cutout while ensuring the strength of the outer drum in view of the above-mentioned existing technical status.

[0007] The second technical problem to be solved by the present invention is to provide a washing machine manufactured by adopting the design method of the washing machine outer drum with a cutout according to the above-mentioned prior art status.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a method for designing a washing machine outer barrel with a cutout, characterized in that the method for designing a washing machine outer barrel comprises the following steps:

[0009] Step 1: Design the outer barrel of the washing machine to have a cutout on at least one side along the width direction of the casing of the washing machine, and the cutout forms a section;

[0010] Step 2: the cut surface is tangent to the outer wall of the inner cylinder, and the cut surface is parallel to the side surface of the casing;

[0011] Step 3: applying loads to the inner drum in three directions, namely, the upper edge, the center and the lower edge of the section, and simulating to obtain the deformation of the inner drum of the washing machine when the loads act on the inner drum in the three directions;

[0012] Step 4, intersecting the inner cylinder geometric bodies under different deformation amounts with the section planes respectively to obtain three closed curves;

[0013] Step 5: Using the three closed curves in step 4 as a curve family, draw an envelope line so that the three closed curves are all inscribed in the envelope line. This envelope line is the minimum cutout shape of the outer barrel.

[0014] In order to improve the strength of the outer drum so that it can match the maximum load force, preferably, the load in step 3 is the maximum centrifugal force that the inner drum is subjected to when the washing machine is in the dehydration condition. The washing machine is subjected to the maximum load when dehydrating, and using this as the force for applying the load, the maximum limit value of the outer drum strength design can be obtained.

[0015] In order to further improve and optimize the strength of the outer barrel design, as a further preferred embodiment, the step 5 further includes the following strength verification method:

[0016] Step 6: The outer barrel is in a complete state without any cuts, and the centrifugal force of the inner barrel during dehydration is used as the load to obtain a preset maximum stress δmax that the outer barrel can withstand;

[0017] Step 7, after the outer barrel is cut according to the minimum cut shape obtained in step 4, the centrifugal force during dehydration of the inner barrel is used as the load, and the load acts on the inner barrel at n circumferential angles respectively, and the maximum stress of the outer barrel under the centrifugal force in the n directions is obtained by simulation, which is β1, β2...βn respectively, where n is a natural number;

[0018] Step 8: Determine whether β1, β2, ..., βn are all less than or equal to the preset maximum stress δmax. If so, the overall strength of the outer barrel meets the requirements; if not, the cutout shape needs to be optimized to enhance the strength of the outer barrel.

[0019] Taking into account the uniformity of load acceptance, preferably, the value of n in step six is ​​8, that is, the load acts on the inner cylinder along the circumferential direction in eight directions with an interval angle of 45°.

[0020] Preferably, the method of optimizing the incision shape in step eight can be achieved by increasing the number of incision edge reinforcement ribs.

[0021] As another preferred embodiment, the method for optimizing the incision shape in step eight may be achieved by optimizing the arrangement of the reinforcing ribs.

[0022] As another preferred embodiment, the method for optimizing the incision shape in step eight can also reduce the incision size by moving the incision position away from the center of the outer barrel, thereby improving the strength of the outer barrel.

[0023] Taking into account the vibration gap and the deformation of the box body and the inner cylinder during operation, as a further optimization, on the premise of satisfying the vibration gap between the inner cylinder and the outer cylinder and the vibration gap between the outer cylinder and the casing, the maximum inner diameter of the inner cylinder is set to Rnt, the distance from the center of the outer cylinder to the cross-section where the incision is located is d, and reducing the incision size by moving away from the center of the outer cylinder needs to satisfy d≥Rnt.

[0024] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a washing machine, comprising a rotatable inner drum and an outer drum arranged outside the inner drum, the outer drum is provided with a cutout on at least one side along the width direction of the washing machine casing, and an end cover that can close the cutout is provided on the cutout, characterized in that: the outer drum is designed using the design method of a washing machine outer drum with a cutout as described above.

[0025] Preferably, the end cap is flexibly connected to the outer drum. In order to make full use of the internal space of the casing and maximize the capacity of the inner drum, the minimum distance between the end cap and the casing corresponding to the end cap can be zero. Generally, the distance between the end cap and the casing can be greater than or equal to zero. When the distance between the end cap and the casing is zero, the end cap directly contacts the casing. As long as the necessary gap between the outer drum and the inner drum is ensured when the washing machine is working, the diameter of the outer drum can be expanded to the maximum, and accordingly, the diameter of the inner drum can also be maximized.

[0026] Compared with the prior art, the advantages of the present invention are: the present design adopts the method of first filling and then cutting, and combines simulation software and three-dimensional modeling software to determine the envelope shape of the outer barrel cut. This method can obtain the outer barrel cut shape with the smallest circumference, and effectively ensure the strength of the outer barrel after the cut; in addition, after the outer barrel cut shape is designed, the influence of the cut shape and size on the outer barrel strength is further determined by adding a strength verification step, and finally the adjusted optimal cut shape and size that meets the outer barrel strength requirements can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of the assembly structure of the inner drum and outer drum of a washing machine according to an embodiment of the present invention.

[0028] Figure 2 It is a front view of the inner drum structure of a washing machine according to an embodiment of the present invention.

[0029] Figure 3 It is a front view of the outer drum structure of a washing machine according to an embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of a washing machine according to an embodiment of the present invention (part of the outer shell is removed). DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] like Figure 4 As shown, the present embodiment discloses a washing machine, which includes a casing 1, wherein the casing 1 includes a rotatable inner drum 3 and an outer drum 2 arranged outside the inner drum 3. In the present embodiment, the horizontal direction is set as the width W of the casing 1, the longitudinal direction is set as the depth D of the casing 1, and the vertical direction is set as the height H of the casing 1. In the present embodiment, the outer drum 2 is respectively provided with a cutout 4 on both symmetrical sides in the width direction of the casing 1, and the cutout 4 is provided with an end cover (not shown in the figure) that can close the cutout 4, and the end cover and the outer drum 2 are flexibly connected.

[0033] In this embodiment, a cutout 4 is provided on the outer barrel 2. If the opening size of the cutout 4 is too small, there is a risk of collision between the outer barrel 2 and the housing 1. If the opening size of the cutout 4 is too large, the strength of the outer barrel 2 is insufficient, and there is a risk of failure. Therefore, how to design the cutout 4 of the outer barrel 2 is a key issue to be solved in this embodiment.

[0034] The outer barrel 2 with the cutout 4 in this embodiment is designed by the following design method, which includes the following steps: Figure 1 to Figure 3 As shown:

[0035] Step 1: Design the outer tub 2 of the washing machine to open a cutout 4 on at least one side along the width direction of the casing 1 of the washing machine, and the cutout 4 forms a cut surface 5;

[0036] Step 2: the cut surface 5 is circumscribed with the outer wall of the inner tube 3, and the cut surface 5 is parallel to the side surface of the casing 1;

[0037] Step 3: The inner cylinder 3 applies loads in three directions, namely, the upper edge, the center and the lower edge of the cut surface 5. Figure 3, after obtaining the deformation of the inner drum 3 of the washing machine when the load forces act on the inner drum 3 in the above three directions through finite element simulation, the three-dimensional model data of the inner drum 3 after deformation is output to the three-dimensional software, thereby obtaining the geometric contour of the inner drum 3 after deformation;

[0038] Step 4: intersect the inner cylinder 3 geometric bodies under different deformation amounts with the section 5 respectively to obtain three closed curves;

[0039] Step 5: Using the three closed curves in step 4 as a curve family, draw an envelope line so that the three closed curves are all inscribed in the envelope line. This envelope line is the shape of the minimum incision 4 of the outer barrel 2.

[0040] Step 6: When the outer barrel 2 is in a complete state without any cuts, the centrifugal force of the inner barrel 3 during dehydration is used as the load, and the preset maximum stress that the outer barrel 2 can withstand is calculated as δmax;

[0041] Step 7: After the outer barrel 2 is cut into the minimum cut shape obtained in step 4, the centrifugal force during dehydration of the inner barrel is used as the load, and the load acts on the inner barrel at n circumferential angles, where n is a natural number. Considering the uniformity of the load, n is preferably 8, that is, the load acts on the inner barrel 3 at eight directions with an interval of 45° along the circumferential direction, see Figure 2 ; The maximum stresses of the outer barrel 2 under the centrifugal forces in the eight directions are obtained by simulation, and are β1, β2, ..., β8, respectively;

[0042] Step eight, determine whether β1, β2, ..., β8 are all less than or equal to the preset maximum stress δmax. If so, the overall strength of the outer barrel 2 meets the requirements; if not, the shape of the cutout 4 needs to be optimized to enhance the strength of the outer barrel 2.

[0043] The applied load in the above steps 3 and 6 is the maximum centrifugal force on the inner drum 3 when the washing machine is in the dehydration condition. Usually, the washing machine is subjected to the largest load when dehydrating, and using this as the applied load force, the maximum limit value of the strength design of the outer drum 2 can be obtained.

[0044] The above steps 6 to 8 are strength verification methods designed to further enhance and improve the reliability of the strength of the outer barrel 2 after the cutout 4 of the outer barrel 2 is designed. The method for optimizing the shape of the cutout 4 in step 8 can be implemented in the following manner:

[0045] ①. Improve the strength of the outer barrel by increasing the number of reinforcement ribs along the edges of the cutout 4;

[0046] ②. Optimize the arrangement of reinforcing ribs to improve the strength of the outer barrel;

[0047] ③. The size of the cutout 4 is reduced by moving the cutout 4 away from the center of the outer barrel 2, thereby increasing the strength of the outer barrel 2.

[0048] Taking into account the vibration gap and the deformation of the casing 1 and the inner barrel 3 during operation, under the premise of satisfying the vibration gap between the inner barrel 3 and the outer barrel 2 and the vibration gap between the outer barrel 2 and the casing 1, the maximum inner diameter of the inner barrel 3 can be set to Rnt, and the distance from the center of the outer barrel 2 to the section 5 where the cutout 4 is located is set to d. At this time, according to the minimum cutout shape of the outer barrel designed in this embodiment, the section 5 of the outer barrel cutout 4 is just tangent to the outer contour of the inner barrel 3. At this time, d=Rnt, as shown in FIG. Figure 1 As shown, if the size of the cutout 4 needs to be reduced by moving away from the center of the outer barrel 2, d≥Rnt needs to be satisfied.

[0049] The end cap of this embodiment is flexibly connected to the outer tub 2. In order to make full use of the internal space of the housing 1 and maximize the capacity of the inner tub 3, the minimum spacing between the end cap that closes the outer tub cutout 4 and the housing 1 on the side corresponding to the end cap can be zero. Generally, the spacing between the end cap and the housing 1 can be greater than or equal to zero. When the spacing between the end cap and the housing 1 is zero, the end cap directly abuts against the housing 1. As long as the necessary gap between the outer tub 2 and the inner tub 3 is guaranteed when the washing machine is working, the diameter of the outer tub 2 can be expanded to the maximum, and accordingly, the diameter of the inner tub 3 can also be maximized.

[0050] In fact, since the diameters of the front and rear edges of the inner cylinder 3 are smaller than the diameter of the cylinder body, the inner cylinder 3 and the outer barrel 2 are less likely to collide. When designing the incision 4 of the outer barrel 2, it is not necessary to make the incision 4 very large. This embodiment adopts the method of first filling and then cutting, combining simulation software and three-dimensional modeling software to determine the envelope shape of the outer barrel incision 4. This method can obtain the shape of the outer barrel incision 4 with the smallest circumference, while effectively ensuring the strength of the outer barrel 2 after the incision.

[0051] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations 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 method for designing a washing machine outer barrel with a cutout, characterized in that: The design method of the outer barrel (2) of the washing machine comprises the following steps: Step 1: Designing an outer barrel (2) of a washing machine to have a cutout (4) on at least one side along the width direction of a casing (1) of the washing machine, wherein the cutout (4) forms a cut surface (5); Step 2: the cut surface (5) is externally tangent to the outer wall of the inner cylinder (3), and the cut surface (5) is parallel to the side surface of the casing (1); Step 3: Loads are applied to the inner drum (3) in three directions, namely, the upper edge, the center and the lower edge of the section (5), and deformation of the inner drum (3) of the washing machine when the loads are applied to the inner drum (3) in the above three directions is obtained by simulation; Step 4: intersecting the geometric bodies of the inner cylinder (3) under different deformation amounts with the section (5) respectively to obtain three closed curves; Step 5: Using the three closed curves in step 4 as a curve family, draw an envelope line so that the three closed curves are all inscribed in the envelope line. This envelope line is the shape of the minimum incision (4) of the outer barrel (2).

2. The method for designing a washing machine outer drum with a cutout according to claim 1, characterized in that: The load in step three is the maximum centrifugal force exerted on the inner drum (3) during the dehydration operation of the washing machine.

3. The method for designing a washing machine outer drum with a cutout according to claim 1, characterized in that: The step 5 also includes the following strength verification method: Step 6: When the outer barrel (2) is in a complete state without any cuts, the centrifugal force of the inner barrel (3) during dehydration is used as a load to obtain a preset maximum stress δmax that the outer barrel (2) can withstand; Step 7, after the outer barrel (2) is cut into the incision (4) according to the minimum incision shape obtained in step 4, the centrifugal force during dehydration of the inner barrel is used as the load, and the load acts on the inner barrel at n circumferential angles respectively, and the maximum stress of the outer barrel (2) under the centrifugal force in the n directions is obtained by simulation, and is β1, β2...βn respectively, where n is a natural number; Step 8: Determine whether β1, β2, ..., βn are all less than or equal to the preset maximum stress δmax. If so, the overall strength of the outer barrel (2) meets the requirements; if not, the shape of the cutout (4) needs to be optimized to enhance the strength of the outer barrel (2).

4. The method for designing a washing machine outer drum with a cutout according to claim 3, characterized in that: The value of n in step six is ​​8, that is, the inner cylinder (3) is acted on in the circumferential direction in eight directions with an interval angle of 45°.

5. The method for designing a washing machine outer drum with a cutout according to claim 3, characterized in that: The method for optimizing the shape of the cutout (4) in step eight is to increase the number of reinforcing ribs at the edge of the cutout (4).

6. The method for designing a washing machine outer drum with a cutout according to claim 5, characterized in that: The method for optimizing the shape of the cutout (4) in step eight is to optimize the arrangement of the reinforcing ribs.

7. The method for designing a washing machine outer drum with a cutout according to claim 3, characterized in that: The method for optimizing the shape of the cutout (4) in step eight is to reduce the size of the cutout (4) by moving the position of the cutout (4) away from the center of the outer barrel (2), thereby improving the strength of the outer barrel (2).

8. The method for designing a washing machine outer drum with a cutout according to claim 7, characterized in that: On the premise that the vibration clearance between the inner cylinder (3) and the outer cylinder (2) and the vibration clearance between the outer cylinder (2) and the casing (1) are satisfied, the maximum inner diameter of the inner cylinder (3) is set to Rnt, the distance from the center of the outer cylinder (2) to the section (5) where the cutout (4) is located is d, and the size of the cutout (4) is reduced by moving away from the center of the outer cylinder (2) so that d≥Rnt is satisfied.

9. A washing machine, comprising a rotatable inner drum (3) and an outer drum (2) arranged outside the inner drum (3), wherein the outer drum (2) is provided with a cutout (4) on at least one side along the width direction of a housing (1) of the washing machine, and an end cover is provided on the cutout (4) for closing the cutout (4), characterized in that: The outer tub (2) is designed by adopting the design method of the outer tub of a washing machine with a cutout as claimed in any one of claims 1 to 8.

10. The method for designing a washing machine outer drum with a cutout according to claim 9, characterized in that: The end cover is flexibly connected to the outer barrel (2), and the minimum distance between the end cover and the casing (1) corresponding to one side of the end cover is zero.

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