Drainage device for refrigeration equipment and refrigeration equipment

Abstract

The present invention discloses a drainage device of a refrigeration equipment and the refrigeration equipment. The refrigeration equipment includes an evaporation chamber, which is surrounded by a bottom plate and a cover shell. An evaporator and an air inlet are arranged in the evaporation chamber. A water receiving tray is arranged below the evaporator. An air inlet ring is arranged at the air inlet. The air inlet and the water receiving tray are both arranged on the bottom plate. The drainage device includes a flow guide assembly, which is arranged on the bottom plate and located in the evaporation chamber. One side wall of the flow guide assembly abuts against the outer peripheral wall of the air inlet ring, one side wall of the flow guide assembly abuts against the water receiving tray, and one side wall of the flow guide assembly abuts against the inner wall of the cover shell. Condensation water condensed on the cover shell drips onto the flow guide assembly, and the flow guide assembly guides the condensation water dripping thereon into the water receiving tray, thereby avoiding water accumulation on the bottom plate, avoiding water accumulation on the bottom plate from overflowing from the air inlet, and avoiding water leakage on the top of the refrigerator.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a drainage device of refrigeration equipment and the refrigeration equipment. Background Art

[0002] Some existing kitchen refrigerators have evaporators installed on the top of the kitchen refrigerator. When installing, the top of the refrigerator is provided with an installation cavity for installing the evaporator. The installation cavity is provided with a bottom plate, which is fixedly connected to the inner tank of the refrigerator. The bottom plate is provided with an evaporator and an air inlet. The lower part of the evaporator is provided with a water receiving tray, which is used to hold the defrosting water of the evaporator during defrosting. An air inlet fan is provided at the air inlet. A cover is provided around the evaporator and the air inlet fan, which is fixedly connected to the bottom plate. The space enclosed between the cover and the bottom plate is the evaporation chamber. Under the suction of the air inlet fan, the air in the storage room flows from the air inlet into the evaporation chamber to exchange heat with the evaporator, and then flows out from the air outlet (not shown) after becoming cold air. During the refrigeration operation of the evaporator, the temperature in the evaporation chamber is low, and the air temperature outside the cover is higher than the air temperature in the evaporation chamber. In this way, the low-temperature air in the evaporation chamber will condense into water droplets after contacting the cover, and the condensed water will flow down the cover to the bottom plate, resulting in water accumulation on the bottom plate. Existing kitchen refrigerators generally do not have a structure for draining water from the bottom plate. The water on the bottom plate cannot be discharged at any time, and the accumulated water will affect the cooling effect of the evaporator. At the same time, when the accumulated water continues to accumulate to a level that exceeds the height of the wind circle of the air inlet, the accumulated water on the bottom plate will overflow from the air inlet, causing water leakage on the top of the kitchen refrigerator, seriously affecting the use of the refrigerator.

[0003] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a drainage device for refrigeration equipment and refrigeration equipment, which can guide condensation water on the cover to a water receiving tray, avoid water accumulation on the bottom plate, avoid water accumulation on the bottom plate overflowing from the air inlet, and avoid water leakage on the top of the refrigerator.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] The present invention provides a drainage device for a refrigeration equipment, the refrigeration equipment comprising: an evaporation chamber, which is surrounded by a base plate and a cover shell, an evaporator and an air inlet are arranged in the evaporation chamber, a water receiving tray is arranged below the evaporator, an air inlet ring is arranged at the air inlet, and the air inlet and the water receiving tray are both arranged on the base plate; the drainage device comprises: a flow guide component, which is arranged on the base plate and located in the evaporation chamber, one side wall of the flow guide component abuts against the peripheral wall of the air inlet ring, one side wall of the flow guide component abuts against the water receiving tray, and one side wall of the flow guide component abuts against the inner wall of the cover shell; condensed water condensed on the cover shell flows along the inner wall of the cover shell to the flow guide component, and the flow guide component guides the condensed water dripping thereon to the water receiving tray.

[0007] Furthermore, the guide body assembly includes two guide bodies, which are symmetrically arranged on both sides of the air inlet ring; the guide body includes a first side wall, a second side wall, a third side wall and a guide surface, the guide surface is respectively connected and intersected with the first side wall, the second side wall and the third side wall, the first side wall abuts against the outer peripheral wall of the air inlet ring, the second side wall abuts against the side wall of the water receiving tray, the third side wall abuts against the inner wall of the cover shell, the first side wall and the guide surface are connected and intersected at a position higher than the end face of the air inlet ring, and the second side wall and the guide surface are connected and intersected at a position higher than the side wall of the water receiving tray; condensation water dripping on the guide body flows into the water receiving tray through the guide surface.

[0008] Furthermore, the guide surface is a slope structure, which gradually decreases from the side away from the water receiving tray to the side close to the water receiving tray, and gradually decreases from the side close to the air inlet ring to the side away from the air inlet ring.

[0009] Furthermore, the inclination angle of the guide surface from the side away from the water receiving tray to the side close to the water receiving tray is 8-12°, and the inclination angle of the guide surface from the side close to the air inlet ring to the side away from the air inlet ring is 8-12°.

[0010] Furthermore, a water retaining rib is provided on one side of the guide surface close to the air inlet ring.

[0011] Furthermore, a side of the guide surface away from the air inlet ring is retracted inwardly to a side wall of the water receiving tray abutting against the guide surface.

[0012] Furthermore, an air inlet fan is provided at the air inlet, and the air inlet fan is connected to the bottom plate through a bracket; and a bracket avoidance portion is provided on the flow guide body to make way for the bracket.

[0013] Furthermore, a temperature sensor is provided on the bottom plate at a position close to the air inlet ring, and a sensor avoidance portion is provided on the guide body to make way for the temperature sensor.

[0014] Furthermore, the material of the flow guide component is thermal insulation foam.

[0015] The present invention also proposes a refrigeration device, including an inner tank, an evaporation chamber is provided on the upper part of the inner tank, the evaporation chamber is surrounded by a base plate and a cover shell, an evaporator and an air inlet are provided in the evaporation chamber, a water receiving tray is provided below the evaporator, an air inlet ring is provided at the air inlet, the air inlet and the water receiving tray are both provided on the base plate, and the drainage device as described above is provided in the evaporation chamber.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are:

[0017] The present invention proposes a drainage device of a refrigeration equipment and a refrigeration equipment. The refrigeration equipment includes an evaporation chamber, which is surrounded by a bottom plate and a cover shell. An evaporator and an air inlet are arranged in the evaporation chamber. A water receiving tray is arranged below the evaporator. An air inlet ring is arranged at the air inlet. The air inlet and the water receiving tray are both arranged on the bottom plate. The drainage device includes a flow guide assembly, which is arranged on the bottom plate and located in the evaporation chamber. One side wall of the flow guide assembly abuts against the peripheral wall of the air inlet ring, one side wall of the flow guide assembly abuts against the water receiving tray, and one side wall of the flow guide assembly abuts against the inner wall of the cover shell. Condensation water condensed on the cover shell drips onto the flow guide assembly, and the flow guide assembly guides the condensation water dripping thereon into the water receiving tray, thereby avoiding water accumulation on the bottom plate, avoiding water accumulation on the bottom plate from overflowing from the air inlet, and avoiding water leakage on the top of the refrigerator.

[0018] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the refrigeration equipment according to an embodiment of the present invention;

[0021] Figure 2 The structure of the evaporation chamber of the embodiment of the present invention is schematically shown. Figure 1 ;

[0022] Figure 3The structure of the evaporation chamber of the embodiment of the present invention is schematically shown. Figure 2 ;

[0023] Figure 4 The structure of the evaporation chamber of the embodiment of the present invention is schematically shown. Figure 3 ;

[0024] Figure 5 The structure of the body guide according to the embodiment of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 6 The structure of the body guide according to the embodiment of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 7 The structure of the body guide according to the embodiment of the present invention is shown in FIG. Figure 3 ;

[0027] Figure 8 The structure of the body guide according to the embodiment of the present invention is shown in FIG. Figure 4 .

[0028] Among them, 100-flow guide, 110-first side wall, 120-second side wall, 130-third side wall, 140-flow guide surface, 141-water retaining rib, 150-sensor avoidance portion, 160-bracket avoidance portion, 161-first bracket avoidance portion, 162-second bracket avoidance portion, 170-connecting hole, 180-bottom surface, 200-refrigeration equipment, 210-box, 220-evaporation chamber, 230-evaporator, 240-bottom plate, 241-connecting column, 242-column, 250-water tray, 260-cover, 270-air inlet, 271-air inlet fan, 272-air inlet wind circle, 2721-inner end surface, 2722-inner peripheral wall, 280-bracket, 281-bracket part 1, 282-bracket part 2, 283-bracket part 3;

[0029] 10-Space A, 20-Space B. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] The present invention discloses a drainage device for refrigeration equipment. In order to facilitate the description and understanding of the structure and function of the drainage device of the present invention, before describing the structure of the drainage device in detail, this article first briefly describes the structure related to the setting of the drainage device in the refrigeration equipment.

[0033] Reference Figures 1 to 4 ,in, Figure 1 The cover 260 is omitted to clearly see the internal structure of the evaporation chamber 220; Figure 3 The cover 260, the evaporator 230 and the flow guide assembly are omitted in order to clearly see the structure in the evaporation chamber 220 before the flow guide assembly is installed; Figure 4 The cover 260 and the evaporator 230 are omitted. A refrigeration device, such as an upright kitchen refrigerator, includes a box body 210, an inner tank (not shown) is arranged in the box body 210, an evaporation chamber 220 is arranged on the upper part of the inner tank, and the evaporation chamber 220 is surrounded by a bottom plate 240 and a cover 260, the cover 260 is fixedly connected to the bottom plate 240, and the bottom plate 240 is fixedly connected to the inner tank. An evaporator 230 and an air inlet 270 are arranged in the evaporation chamber 220, a water receiving tray 250 is arranged below the evaporator 230, an air inlet ring 272 and an air inlet fan 271 are arranged at the air inlet 270, and the water receiving tray 250 and the air inlet 270 are both arranged on the bottom plate 240. The air in the storage room of the refrigeration equipment flows from the air inlet 270 into the evaporation chamber 220 under the suction of the air inlet fan 271, exchanges heat with the evaporator 230, becomes cold air, and then flows out from the air outlet (not shown). After running for a period of time, the evaporator 230 needs to be defrosted, and the defrosted water directly drips into the water receiving tray 250 and is discharged. During the refrigeration operation of the evaporator 230, the temperature in the evaporation chamber 220 is relatively low, and the air temperature outside the cover 260 is higher than the air temperature in the evaporation chamber 220. In this way, the low-temperature air in the evaporation chamber 220 will condense into water droplets after contacting the cover 260, and the condensed water will flow down the cover 260 to the bottom plate 240. The function of the drainage device of the present invention is to guide the condensed water flowing down the cover shell 260 to the water receiving tray 250 for discharge, thereby preventing water from accumulating on the bottom plate 240, preventing water from overflowing from the air inlet 270, and preventing water from leaking from the top of the refrigerator.

[0034] The drainage device includes a flow guide assembly, referring to Figures 4 to 8 The guide assembly is disposed on the bottom plate 240 and is located in the evaporation chamber 220. One side wall of the guide assembly abuts against the peripheral wall of the air inlet ring 272, one side wall of the guide assembly abuts against the water receiving tray 250, and one side wall of the guide assembly abuts against the inner wall of the housing 260. The condensed water condensed on the housing 260 flows along the inner wall of the housing 260 to the guide assembly, and the guide assembly guides the condensed water dripping thereon to the water receiving tray 250.

[0035] Specifically, the flow guide assembly includes two flow guides 100, which are symmetrically arranged on both sides of the air inlet circle 272. Figure 5 and Figure 6 The figure shows a schematic diagram of the structure of the guide body 100 disposed on one side of the air inlet ring 272. Figure 7 and Figure 8 The structure diagram of the guide body 100 disposed on the other side of the air inlet ring 272 is shown. The difference between the two guide bodies 100 is that one of the guide bodies 100 is provided with a sensor avoidance portion 150 for making way for the sensor (see Figure 5 and Figure 6 ), the specific details will be described in detail below. Of course, if the temperature sensor is set on both sides of the air inlet ring 272, then the two guide bodies 100 need to be provided with a sensor avoidance portion 150. The setting position of the sensor avoidance portion 150 on the guide body 100 is determined according to the specific setting position of the temperature sensor.

[0036] from Figure 3It can be seen that there is a certain space between the water receiving tray 250 and the air inlet ring 272. The space between the water receiving tray 250 and one side of the air inlet ring 272 is marked as space A 10, and the space between the water receiving tray 250 and the other side of the air inlet ring 272 is marked as space B 20. The end surface of the air inlet ring 272 located on the evaporation chamber 220 side is defined as its inner end surface 2721. The inner end surface 2721 of the air inlet ring 272 protrudes from the bottom plate 240, that is, there is a certain distance between the inner end surface 2721 of the air inlet ring and the bottom plate 240. The portion between the inner end surface 2721 of the air inlet ring and the bottom plate 240 is defined as the inner peripheral wall 2722 of the air inlet ring. The air inlet fan 271 is fixedly connected to the bottom plate 240 through a bracket 280. The bracket 280 includes a bracket part 281, a bracket part 282 and a bracket part 3 283. The bracket part 281 and the bracket part 3 283 are arranged horizontally, and the bracket part 282 is vertically arranged between the bracket part 281 and the bracket part 3 283. The bracket part 282 is tightly abutted against the outer side of the inner peripheral wall 2722 of the air inlet ring, and the bracket part 3 283 is fixedly connected to the bottom plate 240 through screws. Before the drainage device is installed, the condensed water condensed on the cover 260 will drip along the cover 260 to the bottom plate 240, and will continue to accumulate on the bottom plate 240. When the condensed water in the bottom plate 240 accumulates to a certain amount, it will overflow the air inlet ring 272 and flow out from the air inlet 270, thereby causing water leakage on the top of the refrigerator. At the same time, the condensed water that cannot be discharged in time will also reduce the refrigeration efficiency of the evaporator 230.

[0037] Reference Figure 4 In this embodiment, the guide assembly is installed in the space between the water receiving tray 250 and the air inlet ring 272, that is, one guide 100 is arranged in the space A 10, and the other guide 100 is arranged in the space B 20, which is used to guide the condensation water flowing down the inner wall of the cover 260 to the water receiving tray 250, so that the condensation water can be discharged in time. The outer contour of the guide 100 is determined according to the specific shapes of the space A 10 and the space B 20.

[0038] In this embodiment, the specific structure and shape of the guide body 100 are as shown in FIG. Figures 5 to 8The body guide 100 includes a first side wall 110, a second side wall 120, a third side wall 130 and a guide surface 140. The guide surface 140 is connected and intersected with the first side wall 110, the second side wall 120 and the third side wall 130 respectively. The first side wall 110 is adapted to abut against the outer side of the inner peripheral wall 2722 of the air inlet ring 272, the second side wall 120 is adapted to abut against the side wall of the water receiving tray 250, and the third side wall 130 is adapted to abut against the inner wall of the housing 260. The side of the body guide 100 opposite to the guide surface 140 is called the bottom surface 180. The bottom surface 180 is a planar structure and abuts against the bottom plate 240. In order to achieve its guiding function, the guide surface 140 is set to a slope structure, which gradually decreases from the side away from the water receiving tray 250 to the side close to the water receiving tray 250, and gradually decreases from the side close to the air inlet circle 272 to the side away from the air inlet circle 272.

[0039] The side where the cover shell 260 abuts against the third side wall 130 is an arc-shaped structure, and correspondingly, the third side wall 130 is also set to an arc-shaped structure, so that the third side wall 130 can better fit and abut against the inner wall of the cover shell 260, so that the condensation water flowing down the cover shell 260 can flow to the guide surface 140.

[0040] In order to prevent the condensation water dripping on the guide surface 140 from flowing out of the air inlet 270, the intersection position (marked as S) where the first side wall 110 and the guide surface 140 meet is set higher than the inner peripheral wall 2722 of the air inlet ring 272. In order to prevent the condensation water dripping on the guide surface 140 from flowing smoothly into the water receiving tray 250, the intersection position (marked as P) where the second side wall 120 and the guide surface 140 meet is set higher than the side wall of the water receiving tray 250. The condensation water condensed on the cover 260 flows down along the inner wall of the cover 260 to the guide surface 140, and flows into the water receiving tray 250 under the drainage effect of the guide surface.

[0041] The inclination angle of the guide surface 140 from the side away from the water receiving tray 250 to the side close to the water receiving tray 250 is 8-12°, preferably 10°; the inclination angle of the guide surface 140 from the side close to the air inlet ring 272 to the side away from the air inlet ring 272 is 8-12°, preferably 10°.

[0042] In order to prevent condensation water dripping on the guide surface 140 near the air inlet 270 from splashing out of the air inlet 270, this embodiment provides a water retaining rib 141 on one side of the guide surface 140 near the air inlet ring 272, and the water retaining rib 141 extends along the intersection of the guide surface 140 and the first side wall 110.

[0043] When the two guide bodies 100 are installed on the bottom plate 240, the side of the guide surface 140 away from the air inlet ring 272 is retracted into the side wall of the water receiving tray 250 abutting against it, so as to ensure that the condensation water on the guide surface 140 can flow into the water receiving tray 250 instead of flowing to the outside of the water receiving tray 250.

[0044] The guide body 100 is provided with a bracket avoidance portion 160 for making way for the bracket 280 . Specifically, the bracket avoidance portion 160 includes a first bracket avoidance portion 161 and a second bracket avoidance portion 162 . The first bracket avoidance portion 161 is used to make way for the bracket second portion 282 , and the second bracket avoidance portion 162 is used to make way for the bracket third portion 283 .

[0045] A temperature sensor is usually provided in the evaporation chamber 220, and the temperature sensor is generally located near the air inlet 270. In actual installation, a plurality of hollow columns 242 are pre-installed on the bottom plate 240, and the temperature sensor is fixed in the column 242. The column 242 is generally a plastic structure, which is very easy to be damaged and broken. The first side wall 110 is provided with a sensor avoidance portion 150 to make way for the column 242, see Figure 5 and Figure 6 The sensor avoidance portion 150 protects the column 242 , enclosing the column 242 between the first side wall 110 and the inner circumferential wall of the air inlet ring 272 , and effectively preventing the column 242 from being damaged or broken.

[0046] The two flow guides 100 are both made of high-density thermal insulation foam, so that the flow guides 100 can achieve the flow guiding function while also having the function of thermal insulation, thereby reducing the loss of cold in the evaporation chamber 220 .

[0047] The flow guide 100 is fixedly connected to the base plate 240 by means of interference fit. Specifically, a connecting column 241 is provided on the base plate 240, and a connecting hole 170 is provided on the flow guide 100 to be adapted to be snap-fitted with the connecting column. The connecting column 241 is inserted into the connecting hole 170 to fix the flow guide 100 to the base plate 240. The structure is simple and easy to install.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drainage device for a refrigeration device, the refrigeration device comprising: An evaporation chamber is surrounded by a bottom plate and a cover shell, wherein an evaporator and an air inlet are arranged in the evaporation chamber, a water receiving tray is arranged below the evaporator, an air inlet ring is arranged at the air inlet, and the air inlet and the water receiving tray are both arranged on the bottom plate; Characterized in that the drainage device comprises: a body guide assembly, which is disposed on the bottom plate and located in the evaporation chamber, wherein one side wall of the body guide assembly abuts against the peripheral wall of the air inlet ring, one side wall of the body guide assembly abuts against the water receiving tray, and one side wall of the body guide assembly abuts against the inner wall of the cover shell; The condensed water condensed on the housing flows along the inner wall of the housing to the body guide component, and the body guide component guides the condensed water dripping thereon to the water receiving tray.

2. The drainage device for refrigeration equipment according to claim 1, characterized in that: The guide body assembly includes two guide bodies, and the two guide bodies are symmetrically arranged on both sides of the air inlet ring; The guide body comprises a first side wall, a second side wall, a third side wall and a guide surface, the guide surface is connected and intersected with the first side wall, the second side wall and the third side wall respectively, the first side wall is in contact with the outer peripheral wall of the air inlet ring, the second side wall is in contact with the side wall of the water receiving tray, the third side wall is in contact with the inner wall of the housing, the first side wall and the guide surface are connected and intersected at a position higher than the end surface of the air inlet ring, and the second side wall and the guide surface are connected and intersected at a position higher than the side wall of the water receiving tray; The condensed water dripping on the guide body flows into the water receiving tray through the guide surface.

3. The drainage device for refrigeration equipment according to claim 2, characterized in that: The guide surface is a slope structure, which gradually decreases from the side away from the water receiving tray to the side close to the water receiving tray, and gradually decreases from the side close to the air inlet ring to the side away from the air inlet ring.

4. The drainage device for refrigeration equipment according to claim 3, characterized in that: The inclination angle of the guide surface from the side away from the water receiving tray to the side close to the water receiving tray is 8-12°, and the inclination angle of the guide surface from the side close to the air inlet ring to the side away from the air inlet ring is 8-12°.

5. The drainage device for refrigeration equipment according to claim 3, characterized in that: A water retaining rib is provided on one side of the guide surface close to the air inlet ring.

6. The drainage device for refrigeration equipment according to claim 5, characterized in that: The side of the guide surface away from the air inlet ring is retracted inwardly to the side wall of the water receiving tray abutting against the guide surface.

7. The drainage device of a refrigeration equipment according to any one of claims 2 to 6, characterized in that: An air inlet fan is provided at the air inlet, and the air inlet fan is connected to the bottom plate through a bracket; The guide body is provided with a support avoidance portion for making way for the support.

8. The drainage device of a refrigeration equipment according to any one of claims 2 to 6, characterized in that: A temperature sensor is provided on the bottom plate at a position close to the air inlet ring, and a sensor avoidance portion for making way for the temperature sensor is provided on the body guide.

9. The drainage device for refrigeration equipment according to claim 1, characterized in that: The material of the flow guide component is thermal insulation foam.

10. A refrigeration device, comprising an inner tank, an evaporation chamber is arranged on the upper part of the inner tank, the evaporation chamber is surrounded by a bottom plate and a cover shell, an evaporator and an air inlet are arranged in the evaporation chamber, a water receiving tray is arranged below the evaporator, an air inlet ring is arranged at the air inlet, the air inlet and the water receiving tray are both arranged on the bottom plate, characterized in that: The evaporation chamber is provided with a drainage device as described in any one of claims 1 to 9.

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