CN111254672B

CN111254672B - Heat exchange device and clothes drying appliance with same

Info

Publication number: CN111254672B
Application number: CN201811451283.6A
Authority: CN
Inventors: 朱玉婷; 陈利君; 陆飞; 张琦; 刘云
Original assignee: BSH Electrical Appliances Jiangsu Co Ltd; BSH Hausgeraete GmbH
Current assignee: BSH Electrical Appliances Jiangsu Co Ltd; BSH Hausgeraete GmbH
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2023-09-15
Anticipated expiration: 2038-11-30
Also published as: PL3660203T3; EP3660203B1; CN111254672A; EP3660203A1

Abstract

A heat exchange device comprising a planar body having a tiled arrangement of fluid channels therein, the fluid channels having an inlet and an outlet adapted to receive a cooling medium from the inlet into the fluid channels and from the outlet out of the fluid channels, wherein the body is at least partially made of metal or a material having a thermal conductivity not inferior to that of metal, the body comprising through holes around which the fluid channels are distributed. A clothes drying appliance comprises a heat exchange device arranged between the rear wall of an outer barrel and the rear wall of an inner barrel, and a driving shaft passes through a through hole of the heat exchange device.

Description

Heat exchange device and clothes drying appliance with same

[ field of technology ]

The invention belongs to the technical field of household appliances, and relates to a clothes drying appliance and a heat exchange device thereof.

[ background Art ]

Chinese patent application publication No. CN105463804a discloses a clothes dryer having a laundry treating tub assembly in a cabinet, which includes an inner tub rotatably driven by a motor and an outer tub sleeved outside the inner tub. The outer barrel is connected with the condensing channel and is spatially communicated with the condensing channel; the condensing channel is further connected with a fan and an air heating channel in sequence; the other end of the air heating channel is communicated with the outer barrel space; an air circulation path is thus formed in the tub, the condensing duct, the fan, and the air heating duct. In the drying process, a heater in the air heating passage heats the drying air flowing therein; the heated high-temperature drying air enters the clothes treatment barrel component under the action of the fan, and the moist clothes in the inner barrel are heated to evaporate the moisture in the clothes; the drying air carries the evaporated moisture and then enters the condensing channel, the moisture in the drying air is condensed and turns into liquid state again, the drying air is separated from the drying air, then the drying air turns into low temperature again to be dried, the drying air enters the heating channel again under the drive of the fan, and a new cycle is started, so that the cycle is repeated, and finally, the clothes in the inner barrel are dried. Wherein, the condensing channel is connected with a cooling water inlet pipe. In the drying process, the cooling water flows into the condensing channel from the water inlet pipe, so that heat exchange is carried out with the drying air entering the condensing channel, and moisture in the drying air is condensed.

The U.S. patent No. 6279357B1 discloses a washer-dryer. The washing and drying machine has a drum mounted in an outer tub by a tripod. The rear wall of the outer tub has a groove. Water flows from the water inlet means onto the rear wall of the outer tub. In the drying mode, the drum rotates, and the humid air exits the drum and is stirred by the rotation of the drum. The trickle water contacts the humid air to enhance the condensing effect on the air before the air is heated and returned to the drum along the circulation path.

[ invention ]

It is an object of the present invention to provide a heat exchange device suitable for a laundry drying appliance. According to one aspect of the invention, a heat exchange device comprises a planar body having a tiled distribution of fluid channels therein, the fluid channels having an outlet and an inlet adapted to receive a cooling medium from the inlet into the fluid channels and from the outlet out of the fluid channels, wherein the body is at least partially made of metal or a material having a thermal conductivity not inferior to that of metal, the body comprising through holes around which the fluid channels are distributed.

The body may be implemented as a ring structure with the through holes being circular.

According to one embodiment of the invention, the body comprises a first sheet and a second sheet in abutting engagement with each other, forming said fluid channel therebetween.

According to another embodiment of the invention, the body comprises a conduit which is spread out in a plane and in which the fluid channel is formed.

The conduit may be fixedly connected to the third sheet in a thermally conductive manner.

The pipeline can also be fixed through the connecting bracket.

In addition, the pipe may also comprise a plurality of mutually communicating and adjacent sections, the walls of each section being fixed to each other.

According to one embodiment of the invention, at least one fluid channel is provided on each side of the through hole. The cooling medium may pass through both sides of the through-hole through the respective fluid passages.

According to one embodiment of the invention, the fluid channel is folded and bent, forming an acute angle between each two adjacent bent sections.

According to one embodiment of the invention, the fluid channel is folded and bent, the mutually bent sections being mutually parallel.

According to one embodiment of the invention, the fluid channel is folded and bent with sections bent towards each other, the plate-like body being mounted vertically or obliquely with respect to the horizontal plane, and at least part of the sections of the fluid channel being inclined downwards with respect to the horizontal plane in the direction of fluid flow when the inlet of the fluid channel is higher than the other parts of the fluid channel.

The invention also aims to provide a clothes drying appliance.

According to one aspect of the present invention, a laundry drying appliance comprises an inner tub disposed horizontally or obliquely, rotatably disposed within an outer tub, an inner tub wall having a plurality of holes densely distributed to allow process air involved in drying to circulate between the inner tub and the outer tub, an inner tub rear wall connected to a driving shaft for driving rotation thereof, the driving shaft passing through a bearing provided on the outer tub rear wall, a heat exchange device constructed as above mounted between the outer tub rear wall and the inner tub rear wall, the driving shaft passing through a through hole of the heat exchange device.

According to one embodiment of the invention, the outer tub is connected to a process air channel, in which a fan is arranged, wherein the inlet opening of the process air channel is located on or close to the rear wall of the outer tub.

The air outlet of the process air channel may be near the front end of the outer tub. An air circulation is thus formed between the process air channel and the outer tub.

According to one embodiment of the invention, the body of the heat exchange device is arranged substantially coaxially with the inner tub.

According to one embodiment of the invention, the body of the heat exchange device is fixed to the rear wall of the tub.

According to one embodiment of the invention, the outer edge of the body of the heat exchange device is close to the edge of the rear wall of the tub.

According to one embodiment of the invention, the outlet of the fluid channel is adjacent to a guide means provided on the rear wall of the outer tub, the guide means extending towards the bottom of the outer tub.

Specific embodiments of the present invention will be described below by way of example with reference to the accompanying drawings.

[ description of the drawings ]

FIG. 1 is a schematic view of a laundry drying appliance;

FIG. 2 is a schematic exploded view of a portion of the components of a clothes drying appliance;

fig. 3 is a front view of the heat exchange device of the first embodiment;

FIG. 4 is a schematic view of the constituent elements of the heat exchange device shown in FIG. 3;

fig. 5 is a front view of a heat exchange device and a rear tub of an outer tub according to a second embodiment;

fig. 6 is a perspective view of a heat exchange device of a third embodiment.

[ detailed description ] of the invention

As shown in fig. 1, the laundry drying appliance 1 includes an outer tub 2 constituting a main drying chamber and an inner tub 4 rotatably driven by a motor 3 in the outer tub 2. The wall 41 of the inner tub 4 has dense holes 42 therein so that air communication between the inside of the inner tub 4 and the outer tub 2 is suitable. The inner tub rear wall 43 is connected to a driving shaft 44 which rotates the inner tub rear wall. The drive shaft 44 is in driving connection with the motor 3 through the bearing 23 located on the rear wall 22 of the tub. The inner tub 4 is horizontally disposed. In other embodiments, the inner tub may be disposed obliquely in the outer tub which is also inclined. The above "horizontal" and "inclination" are reference objects with respect to the horizontal or inclination of the central axis of the inner tub 4.

Wherein the outer tub 2 is connected to the process air channel 5. The air inlet 51 of the process air channel 5 is connected to the side wall 21 of the outer tub 2 and is close to the rear wall 22 of the outer tub 2. The air outlet 52 of the process air channel 5 is connected to a gasket 6 mounted on the front side of the outer tub 2. The process air channel 5 is then in spatial communication with the outer tub 2. In other embodiments, the inlet of the process air channel 5 may also be connected to the rear wall 22 of the outer tub 2.

A fan 7 and a heating device 8 are arranged in the process air channel 5. After the fan 7 is started, air can be blown into the process air channel 5 from the air inlet 51 of the process air channel 5, is blown out through the air outlet 52, enters the front part of the outer tub 2, enters the inner tub 4, fully contacts clothes, passes through the holes 42 in the inner tub wall 41, passes through the holes 42, enters the gap 9 between the outer tub rear wall 22 and the inner tub rear wall 43 with lower pressure, is concentrated along the gap 9 to the air inlet 51 of the process air channel 5, and finally enters the process air channel 5, so that one-time circulation flow is completed.

As can be seen, the process air passes more densely through the gap 9 between the outer tub rear wall 22 and the inner tub rear wall 43 in the course of flowing toward the air inlet 51 of the process air channel 5. The heat exchanging arrangement 10 is provided in the gap 9 between the tub rear wall 22 and the tub rear wall 43. The moist, hot process air then passes through the gap 9 and exchanges heat with the heat exchange device 10, the temperature drops and the moisture therein condenses. The process air then enters the process air channel 5 from the air inlet 51 by the fan 7. Subsequently, the process air temperature is raised again by the heating of the heating device 8, and then enters the outer tub 2 and the inner tub 4 again, and contacts with the laundry therein to further evaporate the moisture in the laundry.

The heat exchange device 10 is installed between the outer tub rear wall 22 and the inner tub rear wall 43 through which the process air passes more intensively, thereby allowing the heat exchange device 10 to exert higher heat exchange efficiency. In addition, since a special heat exchange passage is not required, space is more saved, thereby reducing the volume and manufacturing cost of the laundry drying appliance 1.

The heat exchange device 10 is a plate-like structure and is fixed to the tub 2, for example, to the rear wall 22 of the tub. The heat exchange device 10 comprises a fluid channel 11 defined by a material having a good thermal conductivity, the fluid channel 11 having an inlet 12 through a wall 20, such as a rear wall 22, of the outer tub 2. The outlet 13 of the fluid channel 11 is located in the outer tub 2. During operation, a cooling medium is supplied into the fluid channel 11 from the inlet 12 of the fluid channel 11. The cooling medium exchanges heat with the process air contacting the heat exchange device 10 via the heat-conducting channel walls, so that the process air temperature is reduced. The cooling medium having an increased temperature is discharged from the bottom of the outer tub 2. Wherein the cooling medium may be water. The fluid channels 11 can provide the heat exchange device 10 with a continuous cooling medium, while the cooling medium flows in the fluid channels 11, which can be fully heat exchanged with the process air through the channel walls, so that the cooling medium is fully utilized. Meanwhile, since the cooling medium flows in the fluid passage 11, splashing does not occur under the blowing of the air flow, laundry is wetted in the inner tub 4, and the cooling medium is not sucked into the process air passage 5 by the fan 7. In addition, the heat exchange device 10 of the flat plate-like structure, in which the fluid passages 11 are arranged, may be designed to have a relatively thin thickness as required, so that the requirement for the width of the gap 9 between the rear wall 22 and the inner tub rear wall 43 is not high, and the passage of air through the gap is facilitated.

In the embodiment shown in fig. 2, the heat exchange device 10 comprises a flat plate-like body 14. The body 14 is of substantially annular configuration with a circular through hole 15. The main body 14 is fixed to the rear wall 22 of the tub 2 by various possible fixing means, such as welding, pasting, screw fixing or injection molding. Wherein the body 14 is coaxial with the bearing 23 on the rear wall 22 of the outer tub 2 and thus also substantially coaxial with the inner tub 4. The driving shaft 44 passes through the through-hole 15 of the heat exchanging device 10. The heat exchange device 10 is thus arranged so as to be spread by fully utilizing the size of the tub rear wall 22, so that the heat exchange area is as large as possible, and the heat exchange efficiency is improved. And meanwhile, the installation of the outer barrel 2, the inner barrel 4 and a driving system is not influenced. Advantageously, the hot and humid process air is more near the outer tub rear wall 22 along the edges of the outer tub 2 and the inner tub 4, so the design of the through holes 15 allows the fluid passages 11 to be more intensively distributed in the more concentrated areas of the process air. The outer edge 142 of the body 14 of the heat exchange device may extend to near the edge of the tub rear wall 22.

As shown in fig. 3 and 4, in one embodiment, the main body 140 of the heat exchange device 100 has fluid channels 110 distributed in a flat manner. The fluid channel has an inlet 111 and an outlet 112 adapted to receive a cooling medium from the inlet 111 into the fluid channel 110 and from the outlet 112 out of the fluid channel 110.

Wherein the body 140 comprises a first sheet 1401 and a second sheet 1402, each made of metal, which are substantially annular. The first sheet 1401 is substantially planar. The second sheet 1402 has preformed grooves 150 thereon. The first sheet 1401 and the second sheet 1402 are bonded to each other and fixed to each other, thereby forming a substantially annular main body 140. While forming the fluid channel 110 in the space enclosed by the recess 150 and the first sheet 1401. Wherein the first sheet 1401 and the second sheet 1402 may be made of other materials having better heat conducting properties, at least not inferior to that of a general metal.

After the inlet 111, the fluid passage 110 is divided into two, two sides of the through hole 1500, and one outlet 112 at each end. The cooling medium entering the fluid passage 110 from the inlet 111 is then left from both sides of the through-hole 1500, respectively, filling the entire fluid passage 110 while uniformly exchanging heat with the process air passing through both sides of the through-hole 1500.

In the embodiment shown in fig. 3 and 4, the fluid channel 110 is folded and bent and the mutually bent sections 1100 are mutually parallel.

In other embodiments, not shown in the figures, it is possible to implement an acute angle between every two adjacent bent sections. After the heat exchange device is arranged on the rear wall of the outer barrel, the flat plate-shaped main body is vertically or obliquely arranged relative to the horizontal plane according to the arrangement mode of the outer barrel and the inner barrel, and the inlet of the fluid channel is higher than the other parts of the fluid channel. At this time, at least a portion of the section of the fluid passage is inclined downward with respect to the horizontal plane in the fluid flow direction. Typically, the cooling medium is tap water. The cooling water can generate larger potential energy in the inclined bending area and generate larger turbulence in the bending section, so that sediment accumulation of sediment in water in the bending section is reduced, water flow in the fluid channel is smoother, and blockage of the fluid channel is avoided.

As shown in fig. 5, in one embodiment, the body 240 of the heat exchange device 200 includes a tube 160 that is spread out in a planar shape and in which the fluid channel 210 is formed. The pipe 160 is fixed by a connection bracket 170. Wherein the inlet 161 of the duct 160 passes through the tub rear wall 22. The outlet 212 of the fluid channel 210 defined by the conduit 160 is adjacent to the guide 17 provided on the rear wall 22 of the tub. The guide 17 extends toward the bottom of the outer tub 2. The guide 17 may be a rib.

In addition to being secured by brackets 170, in other embodiments not shown, the conduit comprises a plurality of interconnected and closely spaced sections, the walls of each section being secured to each other. I.e. sections of the pipe are adjacent to each other and fixed to each other.

In another embodiment, as shown in fig. 6, heat exchange device 300 includes a conduit 260, conduit 260 being fixedly connected in heat conductive relation to third sheet 1403. Wherein third sheet 1403 is at least partially made of metal or a material having a thermal conductivity that is no less than that of metal.

The various embodiments described above and shown in the figures are only illustrative of the invention. Any modification of the present invention by one of ordinary skill in the related art is within the scope of the basic technical idea of the present invention.

Claims

1. A heat exchange device of a clothes drying appliance, characterized in that: the clothes dryer comprises a flat plate-shaped main body, wherein the main body is provided with fluid channels which are horizontally distributed, the fluid channels are provided with an outlet and an inlet and are suitable for receiving cooling medium, the cooling medium enters the fluid channels from the inlet and leaves the fluid channels from the outlet, the main body is at least partially made of metal or material with heat conduction performance not inferior to that of metal, the main body comprises through holes, the fluid channels are distributed around the through holes, the main body is suitable for being arranged between the rear wall of an outer tub and the rear wall of an inner tub of the clothes dryer, the through holes are used for receiving a driving shaft connected with the inner tub to pass through the through holes, the main body is of an annular structure, the through holes are round, and at least one fluid channel is arranged on two sides of each through hole.

2. The heat exchange device of claim 1, wherein: the body comprises a first sheet and a second sheet which are connected in a fitting manner, and the fluid channel is formed between the first sheet and the second sheet.

3. The heat exchange device of claim 1, wherein: the body includes a conduit that is spread out in a planar fashion and in which a fluid channel is formed.

4. A heat exchange device according to claim 3, wherein: the conduit is fixedly connected with the third sheet in a thermally conductive manner.

5. A heat exchange device according to claim 3, wherein: the pipeline is fixed through the linking bridge.

6. A heat exchange device according to claim 3, wherein: the pipe comprises a plurality of mutually communicated and adjacent sections, and the walls of each section are mutually fixed.

7. The heat exchange device of claim 1, wherein: the fluid channel is folded and bent, and an acute angle is formed between every two adjacent bent sections.

8. The heat exchange device of claim 1, wherein: the fluid channel is folded and bent, and the sections of the fluid channel which are bent are parallel to each other.

9. The heat exchange device of claim 1, wherein: the fluid channel is folded and bent, and is provided with a plurality of sections which are bent mutually, the flat plate-shaped main body is vertically or obliquely arranged relative to the horizontal plane, and at least part of the sections of the fluid channel are downwards inclined relative to the horizontal plane along the fluid flow direction when the inlet of the fluid channel is higher than the other parts of the fluid channel.

10. The utility model provides a clothing drying appliance, contains the interior bucket that level or slope set up, rotationally is located outer bucket, thereby interior bucket wall has the process air circulation between interior bucket and outer bucket that a plurality of densely distributed holes allow to participate in the stoving, interior bucket back wall and drive its pivoted drive shaft connection, and the bearing on the wall is located outer bucket back wall is passed to the drive shaft, its characterized in that: a heat exchange device as claimed in any one of claims 1 to 9 mounted between the rear wall of the outer tub and the rear wall of the inner tub, the body of the heat exchange device being secured to the rear wall of the outer tub, the drive shaft passing through the through-hole of the heat exchange device.

11. The laundry drying appliance of claim 10, wherein: the outer tub is connected to a process air channel in which a fan is arranged, wherein an air inlet of the process air channel is located on or near the rear wall of the outer tub.

12. The laundry drying appliance of claim 11, wherein: the air outlet of the process air channel is near the front end of the outer barrel.

13. The laundry drying appliance of claim 10, wherein: wherein the body of the heat exchange device is arranged substantially coaxially with the inner tub.

14. The laundry drying appliance of claim 10, wherein: the outer edge of the main body of the heat exchange device is close to the edge of the rear wall of the outer tub.

15. The laundry drying appliance of claim 10, wherein: the outlet of the fluid channel is close to a guiding device arranged on the rear wall of the outer barrel, and the guiding device extends towards the bottom of the outer barrel.