Two-phase efficient heat exchange CDU device for server and heat exchange method of two-phase efficient heat exchange CDU device

Abstract

The invention belongs to the technical field of heat exchange, and particularly relates to a two-phase efficient heat exchange CDU device for a server and a heat exchange method of the two-phase efficient heat exchange CDU device. The invention provides a two-phase efficient heat exchange CDU device for a server, and the device comprises a box body which is hollow, and the upper part of the box body is provided with an air inlet; the condenser is arranged in the box body and is suitable for condensing gas; the partition plate is arranged below the condenser; the limiting assembly is arranged below the partition plate in a lifting mode and suitable for opening and closing meshes of the partition plate; wherein the limiting assembly is suitable for blocking the meshes so as to prolong the residence time of the gas in the box body; when the weight of the condensed water collected in each mesh hole is greater than a specified value, the limiting assembly moves downwards relative to the partition plate, so that the condensed water flows downwards; through the arrangement of the limiting assembly, the residence time of gas and condensed liquid in the box body is prolonged, meanwhile, it is avoided that gas bubbles exist in condensed water, and the heat exchange effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchange, and specifically relates to a heat exchange device, and in particular to a two-phase high-efficiency heat exchange CDU device for a server and a heat exchange method thereof. Background Art

[0002] In the refrigeration system, in order to achieve a better refrigeration effect, a subcooler is added; the gas is condensed and liquefied by the phase change condenser and then drips into the subcooler. The subcooler is suitable for cooling the condensed saturated liquid again.

[0003] However, when the gas flows into the heat exchange device, in order to increase the residence time of the gas in the device, a mesh partition is arranged between the subcooler and the phase change condenser; however, the mesh partition cannot prevent some uncondensed gas from flowing to the subcooler. At the same time, bubbles will form in the condensed liquid as it drips down along the outer wall of the condenser, resulting in poor heat exchange effect.

[0004] Therefore, how to solve the problem of short gas residence time in a heat exchange device is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The disclosed embodiments at least provide a two-phase high-efficiency heat exchange CDU device for a server and a heat exchange method thereof.

[0007] In a first aspect, an embodiment of the present disclosure provides a two-phase high-efficiency heat exchange CDU device for a server, comprising: The box body is hollow inside and has an air inlet at the top; A condenser disposed in the tank body and adapted to condense the gas; a partition plate disposed below the condenser; A limit assembly, which is arranged under the partition plate and is suitable for opening and closing the mesh of the partition plate; Wherein, the limit assembly is suitable for blocking the mesh holes to extend the residence time of the gas in the box body; When the weight of the condensed water collected in each mesh is greater than a specified value, the limit assembly moves downward relative to the partition plate to allow the condensed water to flow downward.

[0008] In an optional embodiment, the limiting assembly includes: a limiting plate, which is parallel to the partition plate; A sealing column, which is vertically fixed on the limiting plate, and one sealing column corresponds to one mesh hole, and the sealing column is suitable for blocking the mesh hole; The return spring is arranged at the lower part of the limit plate and is suitable for pushing the limit plate to move toward the partition plate.

[0009] In an optional embodiment, a plurality of guide ports are formed on the limiting plate, one guide port corresponds to one sealing column, and the liquid in the mesh is suitable for flowing downward along the guide ports.

[0010] In an optional embodiment, a guide groove is provided on the side wall of the sealing column, and the guide groove extends axially along the sealing column, and the guide groove is suitable for guiding the liquid in the mesh to flow toward the guide port.

[0011] In an optional embodiment, the height of the sealing column is smaller than the depth of the mesh, wherein when the sealing column is inserted into the mesh, the upper end of the sealing column and the cavity inside the mesh are suitable for temporarily storing liquid.

[0012] In an optional embodiment, the outer wall of the upper end of the sealing column is provided with a chamfer to facilitate the insertion of the sealing column into the mesh.

[0013] In an optional embodiment, a subcooler is disposed in the tank body, and the subcooler is suitable for secondary cooling the liquid flowing through the partition.

[0014] In an optional embodiment, a liquid storage cavity is provided on the inner bottom wall of the box body, and the liquid storage cavity is suitable for storing cooled liquid.

[0015] In an optional embodiment, a condenser, which is disposed in the tank body and is suitable for condensing the gas; a partition plate disposed below the condenser; A limit assembly, which is arranged under the partition plate and is suitable for opening and closing the mesh; The limiting assembly includes: a limiting plate, which is parallel to the partition plate; A sealing column, which is vertically fixed on the limiting plate, and one sealing column corresponds to one mesh hole, and the sealing column is suitable for blocking the mesh hole; A return spring is arranged at the lower part of the limit plate and is suitable for pushing the limit plate to move toward the partition plate; Among them, the sealing column is inserted into the mesh to block the partition to extend the residence time of the gas in the box body; When the weight of the condensed water collected in each mesh is greater than a specified value, the limit assembly moves downward relative to the partition plate to allow the condensed water to flow downward.

[0016] In an optional embodiment, the height of the sealing column is smaller than the depth of the mesh, wherein when the sealing column is inserted into the mesh, the upper end of the sealing column and the cavity inside the mesh are suitable for temporarily storing liquid.

[0017] In a second aspect, an embodiment of the present disclosure further provides a heat exchange method for a CDU device, the heat exchange method comprising: After the gas flows into the box body through the air inlet, the condenser is suitable for cooling the gas to condense it into liquid; At this time, the limit assembly is suitable for blocking the mesh holes to extend the residence time of the gas and the condensed liquid in the box body; When the weight of the condensed water collected in each mesh is greater than a specified value, the limiting assembly moves downward relative to the partition plate to allow the condensed water to flow downward.

[0018] The beneficial effect of the present invention is that the server two-phase high-efficiency heat exchange CDU device and heat exchange method of the present invention, through the setting of the limit component, when the gas is not transported into the box body, the limit component blocks the mesh, thereby extending the residence time of the gas in the box body. The condensed liquid stays in the mesh, and the chamfer of the upper part of the sealing column is conducive to guiding the bubbles in the liquid to flow upward, avoiding the generation of bubbles in the liquid, and improving the cooling effect.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A three-dimensional diagram of a two-phase high-efficiency heat exchange CDU device for a server provided in an embodiment of the present disclosure; Figure 2 A three-dimensional diagram of a partition and a stop assembly provided in an embodiment of the present disclosure; Figure 3 A sectional perspective view of a partition and a stop assembly provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of the state where the sealing column provided in the embodiment of the present disclosure is inserted into the mesh.

[0023] In the figure: 1. Box body; 2. Condenser; 3. partition; 30. mesh; 4. Limiting assembly; 41. Limiting plate; 42. Sealing column; 43. Guide port; 44. Guide groove; 5. Subcooler. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. 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.

[0025] In this article, when it is mentioned that the first component is located on the second component, this may mean that the first component may be directly formed on the second component, or the third component may be interposed between the first component and the second component. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components may be exaggerated or reduced.

[0026] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0028] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0029] After research, it was found that the shortcomings of the existing technology are: when the gas flows into the heat exchange device, in order to increase the residence time of the gas in the device, a mesh partition is arranged between the subcooler and the phase change condenser; however, the mesh partition cannot prevent some uncondensed gas from flowing to the subcooler. At the same time, bubbles will form in the condensed liquid during the process of dripping downwards, resulting in poor heat exchange effect.

[0030] Therefore, how to solve the problem of short gas residence time in a heat exchange device is a technical problem that urgently needs to be solved in this field.

[0031] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present invention in this article for the above problems should be the contributions made by the inventor to the present invention during the disclosure process.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] like Figures 1 to 4As shown, some embodiments provide a two-phase high-efficiency heat exchange CDU device for a server, including: a box body 1, which is hollow inside and has an air inlet on the top; a condenser 2, which is arranged in the box body 1 and is suitable for condensing gas; the condenser 2 is a finned phase change condenser 2, which is connected to a liquid cooling source through a pipeline. After the gas flows into the box body 1 through the air inlet, the gas contacts the outer wall of the condenser 2, and the condenser 2 is suitable for cooling the gas to condense it into liquid, and the liquid drips down along the outer wall of the condenser 2. A partition 3 is arranged below the condenser 2; a plurality of mesh holes 30 are opened in a matrix on the partition 3, and the condensed liquid is suitable for dripping down through the mesh holes 30. Further, in order to improve the refrigeration effect, a subcooler 5 is arranged in the box body 1, and the subcooler 5 is suitable for secondary cooling of the liquid flowing through the partition 3. The subcooler 5 is arranged below the partition 3 and is connected to the liquid cooling source. After the gas is condensed into liquid by the condenser 2, when the liquid drips downward through the partition 3, the supercooler 5 is suitable for secondary cooling of the liquid. The limit assembly 4 is arranged below the partition 3 for lifting and lowering, and is suitable for opening and closing the mesh 30 of the partition 3; the limit assembly 4 is suitable for moving upward or downward relative to the partition 3, and when the limit plate 41 moves upward to abut against the partition 3, the sealing column 42 is suitable for inserting into the mesh 30 to block the mesh 30, and when the limit plate 41 moves downward to the point where the sealing column 42 is separated from the mesh 30, the liquid collected and stored in the mesh 30 is suitable for flowing downward along the guide port 43. Among them, the limit assembly 4 is suitable for blocking the mesh 30 to extend the residence time of the gas in the box body 1; when the weight of the condensed water collected in each mesh 30 is greater than the specified value, the limit assembly 4 moves downward relative to the partition 3 to allow the condensed water to flow downward. By setting the limit assembly 4, when the gas is not transported into the box body 1, the limit assembly 4 blocks the mesh 30, thereby prolonging the residence time of the gas in the box body 1. The condensed liquid stays in the mesh 30, and the chamfer of the upper part of the sealing column 42 is conducive to guiding the bubbles in the liquid to flow upward, avoiding the generation of bubbles in the liquid and improving the cooling effect.

[0035] The gas described in this embodiment is a Freon gas in an evaporated state. In the cooling mode, it absorbs indoor heat in the evaporator and evaporates to form a gas. After flowing through the condenser 2, the condenser 2 is suitable for condensing the gaseous Freon into a liquid state.

[0036] Reference Figure 2The limit assembly 4 includes: a limit plate 41, which is parallel to the partition 3; the limit plate 41 is arranged below the partition 3, and its size is not less than the size of the partition 3. A sealing column 42, which is vertically fixed on the limit plate 41, and one sealing column 42 corresponds to one mesh 30, and the sealing column 42 is suitable for blocking the mesh 30; when the limit plate 41 is pushed upward by the return spring, the sealing column 42 is suitable for being inserted into the mesh 30, and the sealing column 42 is suitable for blocking the mesh 30 to prevent the condensate in the mesh 30 from dripping downward. A return spring is arranged at the lower part of the limit plate 41, and is suitable for pushing the limit plate 41 to move toward the partition 3. Preferably, a support frame is arranged in the box body 1, and the support frame is arranged at the lower part of the limit plate 41, and the lower part of the return spring is fixed on the support frame. When the weight of the condensate in each mesh 30 is greater than a specified value, the limit plate 41 moves downward under the action of gravity until the sealing column 42 is separated from the mesh 30. At this time, the condensate in the mesh 30 is suitable for flowing downward through the guide port 43.

[0037] Reference Figure 2 The limiting plate 41 is provided with a plurality of guide ports 43, one guide port 43 corresponds to one sealing column 42, and the liquid in the mesh 30 is suitable for flowing downward along the guide ports 43. The guide ports 43 are suitable for guiding the condensate on the partition 3 to drip downward.

[0038] In order to avoid excessive pressure in the box body 1, a guide groove 44 is provided on the side wall of the sealing column 42, and the guide groove 44 extends axially along the sealing column 42, and the guide groove 44 is suitable for guiding the liquid in the mesh 30 to flow to the guide port 43. The opening of the guide groove 44 is small, and the flow rate and flow rate of the liquid flowing downward along the guide groove 44 are both less than the condensation rate of the gas by the condenser 2. The setting of the guide groove 44 avoids excessive pressure in the cavity above the partition 3. After the gas is cooled and condensed by the condenser 2, bubbles will be generated in part of the liquid during the process of dripping to the partition 3, and the generation of bubbles will affect the refrigeration effect of the equipment. The upper outer wall of the sealing column 42 is provided with a chamfer to facilitate the insertion of the sealing column 42 into the mesh 30. The setting of the chamfer allows the condensed liquid to flow along the chamfer to the guide groove 44, and the bubbles in the liquid can be broken during the process of the liquid slowly flowing downward. The sealing column 42 is inserted into the mesh 30 so that the condensate dripping from the condenser 2 can evenly wet the partition 3.

[0039] Reference Figure 3, the height of the sealing column 42 is less than the depth of the mesh 30, wherein, when the sealing column 42 is inserted into the mesh 30, the upper end of the sealing column 42 and the cavity inside the mesh 30 are suitable for temporarily storing liquid. After the sealing column 42 is inserted into the mesh 30, the cavity formed by the upper end of the sealing column 42 and the inner wall of the mesh 30 is suitable for temporarily storing liquid, and when the liquid in the cavity overflows, it will flow to the meshes 30 at other positions around until there is condensate in each mesh 30. At this time, the weight of the condensate in the mesh 30 is greater than the elastic force of the return spring on the limit plate 41, and the limit plate 41 moves downward under the action of gravity until the sealing column 42 is separated from the mesh 30. At this time, the liquid in the mesh 30 flows downward along the guide port 43.

[0040] Preferably, the inner bottom wall of the box body 1 is provided with a liquid storage cavity, and the liquid storage cavity is suitable for storing cooled liquid.

[0041] Some embodiments provide a two-phase high-efficiency heat exchange CDU device for a server, comprising: a condenser 2, which is disposed in a box body 1 and is suitable for condensing gas; a partition plate 3, which is arranged below the condenser 2; The limiting assembly 4 is lifted and arranged below the partition 3 and is suitable for opening and closing the mesh 30; The limiting assembly 4 includes: a limiting plate 41, which is parallel to the partition plate 3; A sealing column 42, which is vertically fixed on the limiting plate 41, and one sealing column 42 corresponds to one mesh hole 30, and the sealing column 42 is suitable for blocking the mesh hole 30; A return spring, which is arranged at the lower part of the limit plate 41 and is suitable for pushing the limit plate 41 to move toward the partition plate 3; The sealing column 42 is inserted into the mesh 30 to seal the partition 3, so as to prolong the residence time of the gas in the box body 1; When the weight of the condensed water collected in each mesh 30 is greater than a specified value, the limit assembly 4 moves downward relative to the partition 3 to allow the condensed water to flow downward. The height of the sealing column 42 is less than the depth of the mesh 30, wherein when the sealing column 42 is inserted into the mesh 30, the upper part of the sealing column 42 and the cavity inside the mesh 30 are suitable for temporarily storing liquid.

[0042] Some embodiments provide a heat exchange method for a CDU device, the heat exchange method comprising: After the gas flows into the box body 1 through the air inlet, the condenser 2 is suitable for cooling the gas to condense it into liquid; At this time, the limiting assembly 4 is suitable for blocking the mesh 30 to extend the residence time of the gas and the condensed liquid in the box body 1; When the weight of the condensed water collected in each mesh 30 is greater than a specified value, the limiting assembly 4 moves downward relative to the partition plate 3 to allow the condensed water to flow downward.

[0043] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0045] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A two-phase high-efficiency heat exchange CDU device for a server, characterized in that: include: The box body (1) is hollow inside and has an air inlet at the top; A condenser (2), which is arranged in the box body (1) and is suitable for condensing gas; A partition (3) disposed below the condenser (2); A limit assembly (4), which is arranged to be lifted below the partition (3) and is suitable for opening and closing the mesh (30) of the partition (3); The limiting component (4) is suitable for blocking the mesh holes (30) to extend the residence time of the gas in the box body (1); When the weight of the condensed water collected in each mesh (30) is greater than a specified value, the limit assembly (4) moves downward relative to the partition plate (3) to allow the condensed water to flow downward.

2. The two-phase high-efficiency heat exchange CDU device for servers according to claim 1, characterized in that: The limiting assembly (4) comprises: a limiting plate (41) which is parallel to the partition plate (3); A sealing column (42) vertically fixed on the limiting plate (41), with one sealing column (42) corresponding to one mesh hole (30), the sealing column (42) being suitable for blocking the mesh hole (30); A return spring is arranged at the lower part of the limit plate (41) and is suitable for pushing the limit plate (41) to move in the direction of the partition plate (3).

3. The two-phase high-efficiency heat exchange CDU device for a server according to claim 2, characterized in that: The limiting plate (41) is provided with a plurality of guide ports (43), one guide port (43) corresponds to one sealing column (42), and the liquid in the mesh (30) is suitable for flowing downward along the guide ports (43).

4. The two-phase high-efficiency heat exchange CDU device for a server according to claim 3, characterized in that: A guide groove (44) is provided on the side wall of the sealing column (42), and the guide groove (44) extends axially along the sealing column (42). The guide groove (44) is suitable for guiding the liquid in the mesh (30) to flow toward the guide port (43).

5. The two-phase high-efficiency heat exchange CDU device for servers according to claim 2, characterized in that: The height of the sealing column (42) is smaller than the depth of the mesh (30), wherein when the sealing column (42) is inserted into the mesh (30), the upper end of the sealing column (42) and the cavity inside the mesh (30) are suitable for temporarily storing liquid.

6. The two-phase high-efficiency heat exchange CDU device for servers according to claim 1, characterized in that: The outer wall of the upper end of the sealing column (42) is provided with a chamfer to facilitate the sealing column (42) to be inserted into the mesh (30).

7. The two-phase high-efficiency heat exchange CDU device for a server according to claim 1, characterized in that: A subcooler (5) is arranged in the box body (1), and the subcooler (5) is suitable for secondary cooling of liquid flowing through the partition plate (3).

8. The two-phase high-efficiency heat exchange CDU device for a server according to claim 1, characterized in that: The inner bottom wall of the box body (1) is provided with a liquid storage cavity, and the liquid storage cavity is suitable for storing cooled liquid.

9. A two-phase high-efficiency heat exchange CDU device for a server, characterized in that: A condenser (2), which is arranged in the box body (1) and is suitable for condensing gas; A partition (3) disposed below the condenser (2); A limit assembly (4), which is arranged below the partition (3) and is suitable for opening and closing the mesh (30); The limiting assembly (4) comprises: a limiting plate (41) which is parallel to the partition plate (3); A sealing column (42) vertically fixed on the limiting plate (41), with one sealing column (42) corresponding to one mesh hole (30), the sealing column (42) being suitable for blocking the mesh hole (30); A return spring, which is arranged at the lower part of the limit plate (41) and is suitable for pushing the limit plate (41) to move in the direction of the partition plate (3); The sealing column (42) is inserted into the mesh (30) to seal the partition (3) so as to prolong the residence time of the gas in the box body (1); When the weight of the condensed water collected in each mesh (30) is greater than a specified value, the limit assembly (4) moves downward relative to the partition plate (3) to allow the condensed water to flow downward.

10. The two-phase high-efficiency heat exchange CDU device for a server according to claim 1, characterized in that: The height of the sealing column (42) is smaller than the depth of the mesh (30), wherein when the sealing column (42) is inserted into the mesh (30), the upper end of the sealing column (42) and the cavity inside the mesh (30) are suitable for temporarily storing liquid.

11. A heat exchange method for a CDU device, characterized in that: Using the two-phase high-efficiency heat exchange CDU device for a server as described in any one of claims 1-8 or 9-10, the heat exchange method comprises: After the gas flows into the box body (1) through the gas inlet, the condenser (2) is suitable for cooling the gas to condense it into liquid; At this time, the limiting component (4) is suitable for blocking the mesh hole (30) to prolong the residence time of the gas and the condensed liquid in the box body (1); When the weight of the condensed water collected in each mesh (30) is greater than a specified value, the limit assembly (4) moves downward relative to the partition plate (3) to allow the condensed water to flow downward.

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