A drum washing machine

Abstract

The present application belongs to the technical field of washing machines, and discloses an inner drum and a drum washing machine. The inner drum comprises a drum wall, the drum wall has staggered heating areas and non-heating areas; the heating areas are used for heating under the excitation of an alternating magnetic field; and the non-heating areas are used for supporting clothes in the drum and keeping the clothes apart from the heating areas of the drum wall. In the present application, the drum wall of the inner drum is staggered into heating areas and non-heating areas. The heating areas can heat under the excitation of an alternating magnetic field and then transfer the generated heat to water in the inner drum, thereby achieving a heating effect. The clothes in the drum are not in contact with the heating areas with a high temperature due to self-heating under the support of the non-heating areas, so that the clothes can be protected from being scalded by the drum wall.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of washing machines, in particular, relates to an inner drum and a drum washing machine. BACKGROUND

[0002] In recent years, in order to solve the problem that dirt is easily accumulated between the inner drum and the outer drum of the washing machine and is difficult to clean, the washing machine industry has developed a non-porous inner drum washing machine, that is, no dehydration hole is arranged on the inner drum, so that the inner drum can independently hold washing water during washing. Through the above-mentioned mode, the water storage between the inner drum and the outer drum during washing can be avoided, the amount of washing water is saved, and the accumulation of dirt between the inner drum and the outer drum is largely avoided, so that the dirt between the inner drum and the outer drum is prevented from entering the inner drum to pollute the clothes, and clean and sanitary washing is achieved. However, since there is no water between the inner drum and the outer drum during washing, the washing water cannot be heated by the form of arranging a heating pipe in the outer drum in the traditional washing machine.

[0003] In order to solve the above-mentioned problem, the prior art proposes a scheme of applying an electromagnetic heating device to heat the washing water in the washing machine. For example, a washing machine and a control method thereof are disclosed in Chinese Patent No. 201910767689.3, which comprises: an inner drum having a washing chamber for independently holding washing water; an outer drum sleeved outside the inner drum; and an electromagnetic heating device arranged on the side wall of the outer drum and corresponding to the side wall of the inner drum.

[0004] However, in the above-mentioned scheme, since the side wall of the inner drum is self-heated under the action of the electromagnetic heating device, it may have a high temperature, and there is a risk of being scalded when the clothes directly contact the side wall of the inner drum. In addition, when the clothes in the drum directly adhere to the side wall of the inner drum, the side wall of the inner drum may not be able to fully contact the washing water. At this time, the heat generated by the side wall of the inner drum cannot be quickly dissipated into the water, causing the temperature of the side wall of the inner drum to rise rapidly, further increasing the probability of the clothes in the drum being scalded by the high-temperature side wall of the inner drum, resulting in damage to the clothes.

[0005] Therefore, the present application is proposed. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide an inner drum and a drum washing machine, which can heat the washing water by electromagnetic heating method, and protect the clothes in the drum from being scalded.

[0007] To solve the above-mentioned technical problems, the basic idea of the technical solution of the present application is:

[0008] An inner drum, comprising a drum wall, the drum wall having staggered heating areas and non-heating areas; the heating areas are used to generate heat under the excitation of an alternating magnetic field; the non-heating areas are used to support clothes in the drum, and keep the clothes away from the heating areas of the drum wall.

[0009] Further, the inner surface of the drum wall is convexly arranged at the non-heating areas, and is used to support clothes in the drum; the inner surface of the drum wall forms a concave heating area between adjacent non-heating areas.

[0010] Further, the inner surface of the drum wall is provided with a convex rib extending along the circumference of the inner drum, and a plurality of the convex ribs are arranged along the axial direction of the inner drum; the convex rib forms a non-heating area of the drum wall, and the interval between two adjacent convex ribs forms a heating area of the drum wall.

[0011] Further, the axial width of the convex rib along the inner drum is W1, and the interval width between two adjacent convex ribs is W2, wherein 3×W2≤W1≤7×W2; preferably, 4×W2≤W1≤6×W2, and more preferably, W1=5×W2.

[0012] Further, the axial width of the convex rib along the inner drum is W1, and the interval width between two adjacent convex ribs is W2, wherein 3×W2≤W1≤7×W2; preferably, 4×W2≤W1≤6×W2, and more preferably, W1=5×W2.

[0013] Further, in the cross section passing through the axis of the inner drum, the non-heating area of the drum wall has a semicircular annular cross section curved towards the axis of the inner drum, and the heating area has a semicircular annular cross section curved away from the axis of the inner drum.

[0014] The semicircular annular cross section of the non-heating area has an outer circumferential radius R1, and the semicircular annular cross section of the heating area has an inner circumferential radius R2, wherein 3×R2≤R1≤7×R2; preferably, 4×R2≤R1≤6×R2, and more preferably, R1=5×R2.

[0015] Further, the convex rib extends along the circumference of the inner drum and surrounds one circle.

[0016] Further, the drum wall has a press-shaped structure from the outside to the inside, and the area of the drum wall protruding to the inner side of the inner drum forms the non-heating area.

[0017] Further, the heating area of the drum wall is made of a metal material capable of generating eddy current in an alternating magnetic field, and the non-heating area of the drum wall is made of a material that does not excite eddy current effect in an alternating magnetic field.

[0018] A drum washing machine, comprising the above-mentioned inner drum, and further comprising an electromagnetic heating device arranged outside the inner drum.

[0019] The electromagnetic heating device generates an alternating magnetic field radiating outward, which forms a radiation area on the cylinder wall of the inner cylinder; at least in the radiation area, the cylinder wall of the inner cylinder has heating areas and non-heating areas arranged alternately.

[0020] Further, the electromagnetic heating device has an excitation distance threshold L0;

[0021] The interval distance L1 between the outer surface of the heating area and the electromagnetic heating device is less than or equal to the excitation distance threshold L0, and the interval distance L2 between the outer surface of the non-heating area and the electromagnetic heating device is greater than the excitation distance threshold L0.

[0022] After the above technical solution, the present application has the following beneficial effects compared with the prior art.

[0023] In the present application, the cylinder wall of the inner cylinder is arranged alternately as heating areas and non-heating areas, wherein the heating areas can heat up under the excitation of the alternating magnetic field and then transfer the generated heat to the water inside the inner cylinder, thereby achieving a heating effect, and the clothes in the inner cylinder are supported by the non-heating areas and do not contact the heating areas with a higher temperature due to self-heating, thereby avoiding the clothes being scalded by the cylinder wall and protecting the clothes.

[0024] In the present application, the heating areas are formed by the multiple ribs arranged at intervals to support the clothes in the inner cylinder, and by matching the size of the ribs with the size of the interval distance between the ribs, it can be ensured that the clothes only contact the top of the ribs and do not get stuck in the interval area between the ribs, effectively avoiding the clothes contacting the heating areas of the cylinder wall and the problem of the risk of clothes being scalded.

[0025] In the present application, the alternating heating areas and non-heating areas are formed by the profiled structure of the cylinder wall, which is simple in manufacturing process and easy to implement. In addition, the profiled structure forms a protrusion on the inner side of the inner cylinder and a corresponding recess on the outer surface of the inner cylinder. Thus, for the outer surface of the inner cylinder, the non-heating areas are farther away from the electromagnetic heating device. By installing the electromagnetic heating device at a suitable position, only the heating areas of the cylinder wall can be effectively excited by the alternating magnetic field, and the non-heating areas are located outside the excitable range and do not self-heat, thereby achieving the effect of protecting the clothes from being scalded.

[0026] The specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are part of the present application, serve to provide further understanding of the present application, and the schematic embodiments of the present application and the descriptions thereof serve to explain the present application, but do not constitute undue limitations on the present application. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings:

[0028] Figure 1 is a structural schematic diagram of an inner drum and an electromagnetic heating device in the drum washing machine according to the embodiments of the present application;

[0029] Figure 2 is a front view of the structure shown in the present application; Figure 1

[0030] Figure 3 is a schematic diagram of the A-A section in the present application; Figure 2

[0031] Figure 4 is an enlarged schematic diagram of B in the present application. Figure 3

[0032] In the drawings: 100, inner drum; 110, drum wall; 120, drum bottom; 131, convex rib; 200, electromagnetic heating device; M, heated area; M1, non-heating area; M2, heating area; N, avoiding area.

[0033] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0035] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] ​​​In the description of the present application, it is to be noted that unless specifically stated and limited otherwise, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] As Figures 1 to 4 shown, the embodiment of the present application provides an inner drum 100, and a drum washing machine comprising the inner drum 100.

[0038] Specifically, the drum washing machine comprises a cabinet, the cabinet is internally provided with the inner drum 100 for placing clothes, the axis of the inner drum 100 is arranged in a horizontal or close-to-horizontal direction, and the inner drum 100 can independently hold water during the washing process. The outer side of the inner drum 100 can be provided with an outer drum, or can be provided only with a water collecting device for receiving the drainage of the inner drum 100.

[0039] The above drum washing machine can independently hold water through the inner drum 100, and thus compared with the conventional washing machine, it is not necessary to fill washing / rinsing water between the inner drum and the outer drum, greatly reducing the water consumption of the washing machine, and also avoiding the problem of dirt adhesion between the inner drum and the outer drum.

[0040] Further, since the drum washing machine independently holds water by using the inner drum 100, in order to realize the non-contact heating function of the washing water in the drum, the drum washing machine further comprises an electromagnetic heating device 200. At the same time, in order to cooperate with the electromagnetic heating device 200, the inner drum 100 is at least partially made of a metal material that can generate eddy current in an alternating magnetic field.

[0041] Specifically, the electromagnetic heating device 200 comprises a coil, by passing high-frequency alternating current into the coil, the coil can generate outwardly radiating high-frequency alternating magnetic field. The inner drum 100 is at least partially made of a metal material that can generate eddy current in a high-frequency alternating magnetic field, when it is necessary to heat the washing water, the electromagnetic heating device 200 is turned on to radiate outwardly high-frequency alternating magnetic field, at this time, the inner drum 100 can be excited to generate eddy current to self-heat, and then the generated heat is transmitted to the washing water in the drum to realize the washing water heating function.

[0042] However, since the inner drum 100 directly heats under the action of the electromagnetic heating device 200, when the clothes in the drum directly contact the inner wall of the inner drum 100, especially when the clothes cover a large area of the inner wall of the inner drum 100, the temperature of the inner wall of the inner drum 100 can be too high, causing the problem of clothes scalding.

[0043] Embodiment one

[0044] The embodiment is used to solve the problem of the above-mentioned drum washing machine with electromagnetic heating mode, which has the risk of scalding clothes.

[0045] Specifically, as shown in Figures 1 to 4 The embodiment provides an inner drum 100 applied to the above-mentioned drum washing machine, which comprises a drum wall 110 having staggered heating areas M2 and non-heating areas M1. The heating areas M2 are used to heat under the excitation of an alternating magnetic field, and the non-heating areas M1 are used to support clothes in the drum, so that the clothes are kept apart from the heating areas M2 of the drum wall 110.

[0046] The drum washing machine of the embodiment comprises the above-mentioned inner drum 100, and further comprises an electromagnetic heating device 200 arranged outside the inner drum 100. The electromagnetic heating device 200 generates an alternating magnetic field radiating outward, and the alternating magnetic field forms a radiation area on the drum wall 110 of the inner drum 100. At least in the radiation area, the drum wall 110 of the inner drum 100 has staggered heating areas M2 and non-heating areas M1.

[0047] In the above-mentioned scheme, when the electromagnetic heating device 200 operates to radiate the alternating magnetic field outward, the radiation area is formed on the drum wall 110 of the inner drum 100. In the radiation area, the drum wall 110 of the inner drum 100 has staggered heating areas M2 and non-heating areas M1. The heating areas M2 can be excited by the alternating magnetic field to generate eddy current, thereby realizing self-heating and achieving the heating effect on the washing water in the drum. The clothes in the drum only contact the non-heating areas M1 which do not heat, and under the support of the non-heating areas M1, the clothes do not contact the heating areas M2 which have high temperature due to self-heating, so that the clothes can be protected from being scalded by the drum wall 110.

[0048] In a further scheme of the embodiment, in order to realize the support of the non-heating areas M1 to the clothes in the drum, the inner surface of the drum wall 110 is protrudingly arranged in the non-heating areas M1. Between adjacent non-heating areas M1, the inner surface of the drum wall 110 forms a recessed heating area M2.

[0049] In the above-mentioned scheme, the inner surface of the drum wall 110 has a concave-convex alternating structure, wherein the protruding part is the non-heating area M1 which can contact the clothes. The clothes are difficult to enter the interval between adjacent non-heating areas M1 and contact the recessed heating areas M2, so that the clothes are effectively prevented from being scalded by the high-temperature heating areas M2.

[0050] In the specific scheme of the embodiment, the cylinder wall 110 has the heated area M and the avoidance area N staggered along the axial direction of the inner cylinder 100, wherein the heated area M has the heating area M2 and the non-heating area M1 staggered therein, and the radiation area of the alternating magnetic field generated by the electromagnetic heating device 200 falls completely within the heated area M on the cylinder wall 110.

[0051] In detail, the cylinder wall 110 has the concave-convex alternating structure on the inner surface of the heated area M, so as to form the heating area M2 and the non-heating area M1 staggered therein, and the non-heating area M1 can be used to support the clothes and keep the clothes spaced from the heating area M2. The avoidance area N of the cylinder wall 110 is not radiated by the alternating magnetic field, and thus does not generate heat by itself, and the inner surface thereof can be a smooth surface without the concave-convex structure.

[0052] Further, the inner cylinder 100 further includes a cylinder bottom 120, and the heated area M is arranged on the cylinder wall 110 close to one end where the cylinder bottom 120 is located. Correspondingly, the avoidance area N is arranged on the cylinder wall 110 relatively closer to one end where the cylinder opening is located.

[0053] Correspondingly, the electromagnetic heating device 200 is arranged close to the cylinder bottom 120 of the inner cylinder 100, so that the radiation area of the alternating magnetic field on the cylinder wall 110 can fall within the heated area M.

[0054] When the inner cylinder 100 is installed in the drum washing machine, the axis of the inner cylinder 100 can extend horizontally or at a certain inclination angle with the horizontal direction. When the inner cylinder 100 is installed at an inclination, the end where the cylinder opening is located is often higher than the end where the cylinder bottom 120 is located. Arranging the heated area M close to the cylinder bottom 120 can ensure that the heated area M of the cylinder wall 110 is directly contacted by the washing water in the inner cylinder 100, and thus the washing water can be heated efficiently.

[0055] Further, in the embodiment, the extension length of the heated area M along the axial direction of the inner cylinder 100 is less than the extension length of the avoidance area N along the axial direction of the inner cylinder 100. In this way, the area of the heated area M is less than the area of the avoidance area N.

[0056] During the operation of the drum washing machine, the clothes in the inner cylinder 100 are tumbled in the inner cylinder 100 along with the rotation of the inner cylinder 100. Since the area of the avoidance area N is larger, the clothes are more likely to directly contact the inner surface of the cylinder wall 110 of the avoidance area N. Only the heated area M of the cylinder wall 110 of the inner cylinder 100 can be radiated by the alternating magnetic field, and the heating area M2 can generate heat by itself, while the avoidance area N is not radiated by the alternating magnetic field, and thus does not generate heat by itself, further reducing the risk of the clothes being scalded by contacting the cylinder wall 110 in a high-temperature state.

[0057] In a further aspect of the embodiment, the inner surface of the barrel wall 110 is provided with a plurality of circumferentially extending ribs 131 spaced along the axial direction of the inner drum 100. The ribs 131 form non-heating regions M1 of the barrel wall 110, and the spaces between adjacent two ribs 131 form heating regions M2 of the barrel wall 110.

[0058] During the washing process, when the laundry is tumbled in the inner drum 100 and falls into the heated regions M of the barrel wall 110, the laundry can be collectively lifted by the plurality of spaced ribs 131, so that the laundry only contacts the top of the ribs 131, and is in a suspended state at the spaces between adjacent two ribs 131 without contacting the self-heating heating regions M2.

[0059] The circumferentially extending ribs 131 can effectively support the laundry in the inner drum 100 and form the heating regions M2 with a groove structure between adjacent two ribs 131, so that the laundry does not contact the inner surface of the barrel wall 110 of the heating regions M2. At the same time, the spaces between adjacent two ribs 131 can accommodate washing water, so that the heat generated by the heating regions M2 can be promptly dissipated into the water, ensuring the heating efficiency of the washing water.

[0060] Preferably, the ribs 131 in the embodiment extend around the circumference of the inner drum 100. In this way, during the washing process, the laundry can always be lifted by the ribs 131 without contacting the inner surface of the barrel wall 110 of the heating regions M2. The ribs 131 extending around the circumference of the inner drum 100 can also strengthen the structure of the inner drum 100, especially the barrel wall 110, and enhance the stability of the structure of the inner drum 100.

[0061] In a further aspect of the embodiment, to ensure that the laundry does not enter the spaces between adjacent two ribs 131, the axial width of the ribs 131 is greater than the width of the spaces between adjacent two ribs 131.

[0062] Specifically, the axial width of the ribs 131 is W1, and the width of the spaces between adjacent two ribs 131 is W2, wherein 3×W2≤W1≤7×W2. Preferably, the relationship between W1 and W2 satisfies: 4×W2≤W1≤6×W2.

[0063] In the embodiment, the width W1 of the ribs 131 and the width W2 of the spaces between adjacent two ribs 131 are set to satisfy the above ratio, which can effectively prevent the laundry in the inner drum from being stuck in the space between adjacent two ribs 131 for most types or materials of laundry, thereby avoiding contact between the laundry and the heating regions M2 of the barrel wall 110. It is found through actual tests that when W1=5×W2, the effect of supporting the laundry in the inner drum 100 by the ribs 131 so that the laundry does not contact the heating regions M2 is best.

[0064] Alternatively, to prevent clothing from entering the gap between two adjacent ribs 131, the gap width between two adjacent ribs 131 can be set to be smaller than the height difference between the inner surface of the cylinder wall 110 in the non-heated area M1 and the heated area M2.

[0065] Specifically, the spacing between two adjacent ribs 131 is W2, and the height difference along the radial direction of the inner surface of the cylinder wall 110 between the non-heated area M1 and the heated area M2 is H1, wherein 2×W2≤H1≤4×W2. Preferably, the relationship between W2 and H1 satisfies: 2.5×W2≤H1≤3.5×W2.

[0066] When the spacing W2 between the ribs 131 and the height difference H1 between the non-heated area M1 and the heated area M2 satisfy the above-mentioned proportional relationship, even if the clothes are slightly recessed between adjacent ribs 131, they will not come into contact with the inner surface of the heated area M2 on the drum wall 110. Actual testing has shown that when H1 = 3 × W2, the effect of preventing the clothes from contacting the heated area M2 during the washing process is optimal.

[0067] In the detailed scheme of this embodiment, on the cross-section passing through the axis of the inner cylinder 100, the non-heated region M1 of the cylinder wall 110 has a semi-circular annular section that bends toward the axis of the inner cylinder 100, and the heated region M2 has a semi-circular annular section that bends away from the axis of the inner cylinder 100. The semi-circular annular sections of the non-heated region M1 and the heated region M2 are connected end-to-end.

[0068] Furthermore, the dimensions of the non-heated region M1 and the heated region M2 satisfy the following relationship: the semi-circular annular cross-section of the non-heated region M1 has an outer radius R1, and the semi-circular annular cross-section of the heated region M2 has an inner radius R2, wherein 3×R2≤R1≤7×R2. Preferably, the relationship between R1 and R2 satisfies: 4×R2≤R1≤6×R2.

[0069] In the above design, the top surface of the rib 131 is a convex arc, while the gap between two adjacent ribs 131 is a concave arc. This structure prevents the ribs 131 from rubbing against and damaging the clothes inside the drum. By setting the outer radius R1 of the semi-circular cross-section of the non-heating area M1 and the inner radius R2 of the semi-circular cross-section of the heating area M2 to satisfy the aforementioned ratio, the ribs 131 can support the clothes. Simultaneously, when the clothes slightly concave between adjacent ribs 131, it ensures that the clothes do not contact the inner surface of the heating area M2. Actual testing revealed that the optimal solution in this embodiment is R1 = 5 × R2, which provides the best effect in preventing contact between the clothes and the heating area M2 during washing.

[0070] In a further aspect of the embodiment, the drum wall 110 has a profiled structure from the outside to the inside, and the profiled structure forms a non-heating area M1 on the area protruding inwardly of the drum 100.

[0071] Specifically, in the embodiment, the drum wall 110 of the inner drum 100 is of an integral structure, and the drum wall 110 has the profiled structure in the heating area M, thereby forming a plurality of protruding ribs 131 arranged at intervals. The plurality of protruding ribs 131 are formed by the profiled structure, and the manufacturing process is simple and easy to implement. If an additional component is installed on the inner side of the drum wall 110 to form a protrusion for supporting the clothes, it is also necessary to ensure that the additional component is made of a high-temperature-resistant material to avoid being burnt by the heating area M of the drum wall 110, which is very troublesome.

[0072] However, the drum wall 110 of the integral structure means that the drum wall 110 is made of a unified material. In order to meet the requirement that the heating area M2 can be heated by the alternating magnetic field, the entire drum wall 110 needs to be made of a metal material that can generate eddy current in the alternating magnetic field. At this time, in order to avoid self-heating of the non-heating area M1 of the drum wall 110 which directly contacts the clothes, the embodiment further adopts the following scheme.

[0073] In the drum washing machine described in the embodiment, the electromagnetic heating device 200 has an excitation distance threshold L0. The excitation distance threshold L0 refers to that when the distance between the metal material that can be excited by the alternating magnetic field and the electromagnetic heating device 200 is less than or equal to L0, the metal material can be excited to generate eddy current effect and heat. If the distance between the metal material and the electromagnetic heating device 200 is greater than L0, the alternating magnetic field cannot excite the metal material to generate eddy current effect of sufficient strength to heat.

[0074] Specifically, the alternating magnetic field generated by the electromagnetic heating device 200 has a higher strength in the area close to the electromagnetic heating device 200. The farther the distance from the electromagnetic heating device 200, the lower the strength of the alternating magnetic field, and the lower the strength of the excited eddy current. When the distance exceeds the excitation distance threshold L0, the strength of the eddy current excited by the alternating magnetic field at this position decreases sharply, which is not sufficient to cause the excited material to heat itself.

[0075] In the embodiment, the electromagnetic heating device 200 is fixed to other components (not shown in the figure) at a certain distance from the drum wall 110 of the inner drum 100, for example, an outer drum or a water collecting device outside the inner drum 100. The upper surface of the electromagnetic heating device 200 is arranged at intervals with the outer surface of the drum wall 110, thereby realizing non-contact heating of the washing water in the drum. The installation position of the electromagnetic heating device 200 needs to meet the following conditions:

[0076] The interval distance L1 between the outer surface of the heating region M2 and the electromagnetic heating device 200 is less than or equal to the excitation distance threshold L0, and the interval distance L2 between the outer surface of the non-heating region M1 and the electromagnetic heating device 200 is greater than the excitation distance threshold L0.

[0077] Specifically, in the embodiment, the interval distance between the electromagnetic heating device 200 and the heating region M2 refers to the interval distance between the upper surface of the electromagnetic heating device 200 and the heating region M2.

[0078] Through the above structure, the heating region M2 of the cylinder wall 110 can be effectively excited by the alternating magnetic field, so as to achieve self-heating to heat the washing water. The non-heating region M1 is located outside the action range of the electromagnetic heating device 200, and the strength of the alternating magnetic field at the non-heating region M1 is not enough to excite the eddy current with sufficient strength, so that the non-heating region M1 will not self-heat, but only can be slightly heated by heat transfer of the heating region M2. Therefore, the effect that the temperature of the non-heating region M1 on the cylinder wall 110 of the inner cylinder 100 is lower than the temperature of the heating region M2 can be achieved, and the clothes in the cylinder only contact the non-heating region M1, thereby avoiding the problem of clothes being scalded.

[0079] In the preferred embodiment of the present embodiment, the electromagnetic heating device 200 is arranged along the circumferential direction of the inner cylinder 100, and the surface of the electromagnetic heating device 200 facing the cylinder wall 110 of the inner cylinder 100 is a circular arc surface coaxial with the cylinder wall 110. Through this structure, the area of the radiation region of the alternating magnetic field can be increased while ensuring that the radiation region of the alternating magnetic field does not exceed the heating region M of the cylinder wall 110 in the axial direction of the inner cylinder 100, thereby achieving higher heating efficiency. At the same time, the distance between the upper surface of the electromagnetic heating device 200 and the cylinder wall 110 remains consistent along the circumferential direction of the inner cylinder 100, which can ensure that the cylinder wall 110 is uniformly heated in the radiation region of the alternating magnetic field.

[0080] In addition, since the cylinder wall 110 of the inner cylinder 100 forms the heating region M2 and the non-heating region M1 through the pressure forming structure, the corresponding convex-concave staggered structure is also formed on the outer surface of the cylinder wall 110. When the upper surface of the electromagnetic heating device 200 is arranged as a circular arc surface coaxial with the cylinder wall 110, the structure that the outer surface of each of the heating region M2 and the non-heating region M1 has different interval distances with the upper surface of the electromagnetic heating device 200, and the corresponding interval distance of the non-heating region M1 is greater, can be naturally formed. By installing the electromagnetic heating device 200 at a suitable distance from the cylinder wall 110, the heating region M2 can be excited to generate heat, but the non-heating region M1 will not self-heat.

[0081] Furthermore, in order to ensure that the radiation area of ​​the alternating magnetic field generated by the electromagnetic heating device 200 on the cylinder wall 110 falls into the interior of the heated zone M, the width of the electromagnetic heating device 200 along the axial direction of the inner cylinder 100 is less than or equal to the extension length of the heated zone M along the axial direction of the inner cylinder 100.

[0082] The radiation area of ​​the alternating magnetic field on the cylinder wall 110 is approximately the coverage area of ​​the electromagnetic heating device 200 projected onto the inner cylinder 100 cylinder wall 110. By setting the width of the electromagnetic heating device 200 along the axial direction of the inner cylinder 100 to be less than or equal to the extension length of the heated zone M along the axial direction of the inner cylinder 100, it can be ensured that the radiation area does not exceed the range of the heated zone M along the axial direction of the inner cylinder 100. This ensures that when the electromagnetic heating device 200 is working, the clearance area N of the cylinder wall 110 will not be excited by the alternating magnetic field and generate its own heat.

[0083] In detail, in this embodiment, the electromagnetic heating device 200 extends semi-circumferentially along the inner cylinder 100. When the electromagnetic heating device 200 is working, it can simultaneously heat the lower half of the heated area M of the cylinder wall 110, ensuring high heating efficiency.

[0084] Furthermore, in this embodiment, along the axial direction of the inner cylinder 100, the side of the electromagnetic heating device 200 near the cylinder bottom 120 is flush with the plane where the cylinder bottom 120 is located, and the side away from the cylinder bottom 120 is aligned with the rib 131 furthest from the cylinder bottom 120 (i.e., Figure 3 The center of the rightmost rib 131 is aligned with the center of the inner cylinder. In this way, when the electromagnetic heating device 200 is working, the position of the radiation area of ​​the alternating magnetic field on the inner cylinder wall 110 that is furthest from the bottom of the cylinder 120 coincides with the highest position of the top of the rib 131 that is furthest from the bottom of the cylinder 120.

[0085] In the drum washing machine of this embodiment, the electromagnetic heating device 200 and the inner drum 100 have the above-described mating structure, thereby... Figure 3 The rightmost rib 131 has its left half located within the radiation region of the alternating magnetic field, while its right half does not enter the radiation region and will not be excited to generate heat.

[0086] In this embodiment, the drum washing machine includes an inner drum 100 having the above-described structure, and an electromagnetic heating device 200 disposed below the inner drum 100 and spaced apart from the drum wall 110. During the washing process, clothes are placed inside the inner drum 100, and the clothes are washed by water independently contained in the inner drum 100.

[0087] When the washing water in the inner drum 100 needs to be heated, the electromagnetic heating device 200 is turned on, and a high-frequency alternating current is passed through its coil, thereby generating a high-frequency alternating magnetic field that radiates outwards. This high-frequency alternating magnetic field radiates onto the drum wall 110 of the inner drum 100, forming a radiation area. This radiation area falls into the heated zone M of the drum wall 110. The heated zone M2 is closer to the electromagnetic heating device 200 and can be excited to generate eddy currents, achieving self-heating. The generated heat can then be transferred to the washing water inside the drum, achieving the washing water heating effect. However, the non-heated zone M1 is too far from the electromagnetic heating device 200 to be excited and will not generate heat independently.

[0088] During the heating process, the inner drum 100 rotates according to a set program, causing the clothes inside to tumble. When the clothes move towards the bottom 120 and come into contact with the heated area M of the drum wall 110, the multiple raised ribs 131 in the heated area M lift the clothes, ensuring that the clothes only contact the tops of the raised ribs 131 and not the gaps between adjacent raised ribs 131. Therefore, the clothes do not come into contact with the heated area M2, which has a higher temperature. Thus, within the heated area M, the heated area M2 between adjacent raised ribs 131 can directly contact the washing water inside the drum for heating, but will not come into contact with the clothes inside the drum. Meanwhile, the non-heated area M1 formed by the raised ribs 131 has a relatively low temperature, and its direct contact with the clothes inside the drum will not cause burns, avoiding the problem of clothes being burned by the drum wall 110 during the washing process.

[0089] Example 2

[0090] like Figures 1 to 4 As shown, the difference between this embodiment and the first embodiment above is that the heating area M2 and the non-heating area M1 of the cylinder wall 110 are made of different materials.

[0091] Specifically, the heated region M2 of the cylinder wall 110 is made of a metallic material that can generate eddy currents in an alternating magnetic field, while the unheated region M1 of the cylinder wall 110 is made of a material that does not generate eddy current effects in an alternating magnetic field. For example, the unheated region M1 of the cylinder wall 110 can be made of a high-temperature resistant plastic material.

[0092] In this embodiment, the specific structure of the heating area M2 and the non-heating area M1 is the same as that in Embodiment 1 above, and will not be described again.

[0093] In the embodiment, the heating area M2 and the non-heating area M1 of the cylinder wall 110 are made of different materials. The heating area M2 can be heated by the electromagnetic heating device 200, but the clothes are supported by the non-heating area M1 and cannot contact the heating area M2, thereby preventing the clothes from being scalded by the cylinder wall 110. The heating area M2 is made of a material that is not excited by an alternating magnetic field, so it will not heat itself when the electromagnetic heating device 200 is working, and has a lower temperature. The clothes directly contacting the non-heating area M1 are not at risk of being scalded.

[0094] Embodiment Three

[0095] The difference between the embodiment and the above-mentioned embodiments is that the ribs are not continuously arranged around the circumference of the inner cylinder, but are discontinuously arranged in multiple ribs on the same circle in the circumferential direction.

[0096] Specifically, at least two ribs are arranged on the same circle in the circumferential direction of the inner cylinder in the heated area of the cylinder wall, and the ends of the adjacent two ribs are oppositely spaced. Each rib forms a non-heating area of the cylinder wall, and the area in the heated area except the ribs forms a non-heating area.

[0097] Further, in the embodiment, the spacing distance between the ends of the two ribs on the same circle is equal to the spacing distance between the two ribs in the axial direction of the inner cylinder, and the size relationship between the heating area and the non-heating area still satisfies the proportional relationship described in Embodiment One.

[0098] Specifically, the height difference between the inner surface of the cylinder wall in the non-heating area and the heating area, the size of the heating area in the circumferential and axial directions of the inner cylinder, and the width of the rib in the axial direction of the inner cylinder all maintain the same proportional relationship as in Embodiment One. In this way, it is ensured that the inner cylinder in the embodiment can support the clothes with the non-heating area of the cylinder wall so that the clothes do not contact the heating area.

[0099] In a further aspect of the embodiment, the discontinuous positions of the ribs on each circle in the axial direction of the inner cylinder can be the same or different in the circumferential direction of the inner cylinder, both of which can achieve the effect of making the clothes not contact the heating area.

[0100] Embodiment Four

[0101] The difference between the embodiment and the above-mentioned embodiments is that the cylinder wall alternately has a non-heating area with ribs and a heating area without ribs in the circumferential direction of the inner cylinder, and the non-heating areas are staggered in the two adjacent circles on the cylinder wall.

[0102] For example, the convex ribs are arranged along the circumferential direction of the inner cylinder to form a non-heating area with a half circle, and the other half circle is a heating area without the convex ribs. In the axial direction of the inner cylinder, the two sides of the convex ribs are heating areas without the convex ribs, and the two sides of the half circle without the convex ribs in the heating area are non-heating areas with the convex ribs arranged along the circumferential direction of the inner cylinder.

[0103] In the embodiment, the heating areas and the non-heating areas on the cylinder wall are distributed in a chessboard pattern. However, the width of the heating area in the axial direction of the inner cylinder (i.e., the interval width between adjacent convex ribs) is smaller than the width of the non-heating area (i.e., the convex rib) in the axial direction of the inner cylinder, so there is a certain overlapping range of the convex ribs on the adjacent two circles in the axial direction of the inner cylinder.

[0104] Preferably, the cylinder wall of the inner cylinder has at least two first non-heating areas extending in the axial direction of the inner cylinder and without the convex ribs, and the convex ribs extend from one of the first non-heating areas to an adjacent first non-heating area in the circumferential direction of the inner cylinder. In the interval area between the adjacent two first non-heating areas, the convex ribs are arranged in multiple in the axial direction of the inner cylinder, and the second non-heating areas are formed between adjacent two convex ribs. In the adjacent two interval areas, the convex ribs are arranged in a staggered manner in the axial direction of the inner cylinder, and the second non-heating areas are correspondingly arranged in a staggered manner.

[0105] In the above scheme, the width of the first non-heating area in the circumferential direction of the inner cylinder is the same as the width of the second non-heating area in the axial direction of the inner cylinder, and both are smaller than the width of the convex rib in the axial direction of the inner cylinder.

[0106] Embodiment Five

[0107] The embodiment is a further limitation of the above-mentioned embodiment one. The cylinder wall of the inner cylinder has at least two heating areas arranged in the axial direction of the inner cylinder, and the avoidance area is between the two heating areas, i.e., the heating areas and the avoidance area are arranged in the axial direction of the inner cylinder alternately.

[0108] Correspondingly, the drum washing machine of the embodiment is provided with the same number of electromagnetic heating devices as the number of the heating areas, and the radiation area of the alternating magnetic field generated by each electromagnetic heating device falls into the heating area of the upper cylinder wall one by one.

[0109] In the embodiment, each heating area is provided with a convex structure for supporting the clothes, such as a convex rib surrounding the inner cylinder. During the washing process, the clothes in the cylinder can directly contact the inner surface of the avoidance area on the cylinder wall, and the avoidance area will not heat spontaneously and will not scald the clothes because it is not radiated by the alternating magnetic field. When the clothes contact the heating area of the cylinder wall, the clothes are lifted by the convex structure and do not completely adhere to the inner surface of the cylinder wall, effectively avoiding the problem of scalding the clothes by the heating area of the cylinder wall.

[0110] In the preferred scheme of the embodiment, a plurality of ribs are arranged in the respective heated area and spaced along the axial direction of the inner drum. When the heated area on the drum wall has an avoidance area on both sides along the axial direction of the inner drum, the electromagnetic heating device below the heated area has both sides in the width direction flush with the center positions of the two ribs closest to the edge in the heated area.

[0111] The drum washing machine of the embodiment has at least two heated areas with a raised structure on the inner surface of the drum wall, and the same number of electromagnetic heating devices are arranged correspondingly, so that along the axial direction of the inner drum, the multiple areas of the drum wall can realize excited self-heating, and the areas capable of realizing self-heating will not cause scalding damage to the clothes due to complete adhesion to the clothes. Therefore, the embodiment realizes more uniform and efficient heating effect of the washing water in the drum under the premise of protecting the clothes.

[0112] Embodiment six

[0113] The difference between the embodiment and the above-mentioned embodiments is that the specific structure of the raised structure is different.

[0114] As a first specific implementation of the embodiment, the raised structure is a rib extending along the axial direction of the inner drum, the rib is arranged along the circumferential direction of the inner drum and surrounds the inner drum.

[0115] Specifically, the heated area is arranged at least in the region near one end of the drum bottom, one end of the rib is arranged with a certain interval from the drum bottom, and the other end is located at the junction of the heated area and the avoidance area.

[0116] Preferably, the interval distance between the end of the rib and the drum bottom is the same as the interval distance between the adjacent two ribs, and both are smaller than the width dimension of the rib.

[0117] As a second specific implementation of the embodiment, the raised structure is a rib extending at a certain angle relative to the axial direction of the inner drum, the rib is arranged along the circumferential direction of the inner drum and surrounds the inner drum.

[0118] Similarly to the first specific implementation, when the heated area is arranged at least in the region near one end of the drum bottom, one end of the rib is kept a certain interval from the drum bottom, and extends at a certain angle relative to the axial direction of the inner drum to the other end located at the junction of the heated area and the avoidance area.

[0119] Preferably, the interval distance between the end of the rib and the drum bottom is the same as the interval distance between the adjacent two ribs, and both are smaller than the width dimension of the rib.

[0120] As a third specific embodiment of the present embodiment, the protruding structure is a plurality of point-like protrusions distributed at intervals in the heated area. The point-like protrusions can be polygonal protrusions or circular protrusions, and preferably are circular protrusions, which can reduce scratching of the clothes in the drum.

[0121] Specifically, the point-like protrusions are arranged at intervals along the circumference of the inner drum in the heated area of the inner drum wall to form a circle, and multiple circles are arranged along the axial direction of the inner drum. The point-like protrusions in adjacent two circles are staggered along the circumference of the inner drum, which can achieve more dense arrangement of the point-like protrusions in the heated area, thereby effectively supporting the clothes and avoiding the clothes from contacting the interval regions between the point-like protrusions in the heated area of the drum wall.

[0122] Preferably, in the above scheme, the interval distance between the two closest point-like protrusions is less than the size of a single point-like protrusion.

[0123] In the present embodiment, various different schemes of the protruding structure in the heated area of the drum wall are provided, and the protruding structure in the above different embodiments can be formed by profiling the drum wall from the outside to the inside. During the washing process, the different protruding structures described above can all achieve the effect of lifting the clothes on the inner side of the heated area, thereby preventing the clothes from being scalded by the self-heating inner drum wall.

[0124] The above only describes the preferred embodiments of the present application and does not limit the present application in any form. Although the present application has been disclosed as above with reference to the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the present application.

Claims

1. An inner tube characterized by, The cylinder wall has heating regions and non-heating regions arranged alternately; The inner surface of the cylinder wall is convexly arranged at the non-heating regions to support clothes in the cylinder and keep the clothes away from the heating regions of the cylinder wall; the inner surface of the cylinder wall forms concave heating regions between adjacent non-heating regions to generate heat under the excitation of an alternating magnetic field; The inner surface of the cylinder wall is provided with a plurality of convex ribs extending along the circumference of the inner cylinder and arranged along the axial direction of the inner cylinder to form the non-heating regions of the cylinder wall; the space between two adjacent convex ribs forms the heating regions of the cylinder wall; The cylinder wall has a profile structure from outside to inside, and the non-heating regions are formed by the areas of the profile structure protruding inwardly to the inner side of the inner cylinder.

2. The inner tube according to claim 1, characterized in that The width of the convex ribs along the axial direction of the inner cylinder is W1, and the width of the space between two adjacent convex ribs is W2, where 3×W2≤W1≤7×W2; And / or, the width of the space between two adjacent convex ribs is W2, and the height difference between the non-heating regions and the heating regions of the inner surface of the cylinder wall is H1, where 2×W2≤H1≤4×W2.

3. The inner tube according to claim 1, characterized by In a cross section passing through the axis of the inner cylinder, the non-heating regions of the cylinder wall have a semicircular annular cross section curved toward the axis of the inner cylinder, and the heating regions have a semicircular annular cross section curved away from the axis of the inner cylinder; The semicircular annular cross section of the non-heating regions has an outer circumferential radius R1, and the semicircular annular cross section of the heating regions has an inner circumferential radius R2, where 3×R2≤R1≤7×R2.

4. The inner tube according to claim 1, characterized by The convex ribs extend along the circumference of the inner cylinder and surround a circle.

5. The inner tube according to any one of claims 1 to 4, characterized in that The heating regions of the cylinder wall are made of a metal material that can generate eddy currents in an alternating magnetic field, and the non-heating regions of the cylinder wall are made of a material that does not excite eddy current effect in an alternating magnetic field.

6. A drum-type washing machine including an inner tub, characterized by The electromagnetic heating device is also provided outside the inner cylinder; The electromagnetic heating device generates an alternating magnetic field radiating outwardly, which forms a radiation region on the cylinder wall of the inner cylinder; at least in the radiation region, the cylinder wall of the inner cylinder has heating regions and non-heating regions arranged alternately; The inner surface of the cylinder wall is convexly arranged at the non-heating regions to support clothes in the cylinder and keep the clothes away from the heating regions of the cylinder wall; the inner surface of the cylinder wall forms concave heating regions between adjacent non-heating regions to generate heat under the excitation of an alternating magnetic field; The electromagnetic heating device has an excitation distance threshold L0; the distance L1 between the outer surface of the heating regions and the electromagnetic heating device is less than or equal to the excitation distance threshold L0, and the distance L2 between the outer surface of the non-heating regions and the electromagnetic heating device is greater than the excitation distance threshold L0.

7. The drum-type washing machine according to claim 6, characterized in that, The inner cylinder is as claimed in any one of claims 1-5.

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