Dish washer
Patent Information
- Application Number
- KR1020250091206
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-04-02
- Filing Date
- 2025-07-07
- Publication Date
- 2026-09-01
Smart Images
Figure PAT00002_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to a dishwasher, and more specifically, to a dishwasher equipped with a heat pump system for heating washing water. Background Technology
[0002] The content described in this section merely provides background information regarding the present invention and does not constitute prior art.
[0003] The content described in this section merely provides background information regarding the present invention and does not constitute prior art.
[0004] A dishwasher is a device that uses detergent and washing water to clean dirt, such as food residue, stuck to dishes or cooking utensils.
[0005] A typical dishwasher includes a tub that provides a washing space, a rack provided within the tub for holding dishes, a spray arm that sprays wash water onto the rack, a sump that stores wash water, and a pump that supplies wash water stored in the sump to the spray arm.
[0006] The washing water used in a dishwasher may be at room temperature, but using high-temperature washing water can improve washing efficiency and reduce washing time. Therefore, washing or rinsing of dishes can be performed using high-temperature washing water in at least some of the processes during the operation of the dishwasher.
[0007] A heating device for heating the washing water may be equipped with, for example, an electric heater of the electric heating type, a heat pump system, etc.
[0008] Since heat pump systems are more energy-efficient than electric heaters, the adoption of heat pump systems for heating wash water in dishwashers has been increasing recently.
[0009] A heat pump system may be equipped with a condenser that heats the wash water by exchanging heat between the high-temperature refrigerant and the relatively low-temperature wash water. The wash water can be heated to a high temperature as it passes through the condenser.
[0010] In the condenser, the refrigerant and the wash water can flow separately. Accordingly, heat is transferred from the high-temperature refrigerant to the wash water, causing the refrigerant to condense and the wash water to be heated.
[0011] In the condenser, heat exchange can occur between the refrigerant and the wash water. Consequently, the wash water can be heated by absorbing heat from the refrigerant.
[0012] The wash water flowing through the condenser may contain foreign substances such as food residue. If the wash water continuously passes through the condenser, the foreign substances contained in the wash water may accumulate inside the condenser.
[0013] These foreign substances can obstruct heat exchange between the refrigerant and the wash water in the condenser and hinder the flow of the wash water. Therefore, it is necessary to develop a dishwasher with a structure that prevents the accumulation of foreign substances inside the condenser.
[0014] In addition, it is necessary to develop a dishwasher with a structure that can enhance heat exchange performance between the refrigerant and the wash water inside the condenser. The problem to be solved
[0015] The objective of the present invention is to provide a dishwasher having a structure capable of suppressing the accumulation of foreign substances inside the condenser.
[0016] In addition, the objective of the present invention is to provide a dishwasher equipped with a condenser having a structure capable of enhancing heat exchange performance between the refrigerant and the washing water.
[0017] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood from the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem
[0018] A dishwasher according to one embodiment may include a tub in which dishes are received.
[0019] The dishwasher may include a sump located at the bottom of the tub. Wash water may be stored in the sump.
[0020] The dishwasher may include a filter installed in the sump. The filter can filter the wash water returned to the sump.
[0021] The dishwasher may include a condenser positioned at the bottom of the tub. Washing water and refrigerant may flow through the condenser.
[0022] The condenser may include a housing that forms the outer shape. The housing may be configured to allow cleaning water and refrigerant to flow separately inside.
[0023] The condenser may include a first tube provided inside the housing. Refrigerant may flow through the first tube.
[0024] The first distance, defined as the distance between the inner surface of the housing and the outer surface of the first tube, may be provided to be larger than the diameter of the through hole formed in the filter through which washing water passes. The first distance, defined as the shortest straight-line distance between the inner surface of the housing and the outer surface of the first tube, may be provided to be larger than the diameter of the through hole formed in the filter through which washing water passes.
[0025] The first tube can be placed inside the housing in the form of a spiral coil.
[0026] At this time, the first distance, defined as the shortest straight distance between the inner surface of the housing and the outer surface of the first tube, may be provided to be larger than the diameter of the through hole.
[0027] In a shell-coil type condenser, a second distance, defined as the shortest straight-line distance between the outer surfaces of adjacent coils, can be provided to be larger than the diameter of the through hole.
[0028] In the dishwasher according to the present invention, at least one of the first distance or the second distance may be provided with a diameter of 1.5 to 2.5 times the diameter of the through hole.
[0029] The flow cross-sectional area of the washing water in the condenser may be equal to or larger than the flow cross-sectional area of the washing water pipe connecting the washing pump that transports the washing water and the condenser.
[0030] A condenser of another embodiment may include a housing that forms the outer shape. The housing may be configured so that cleaning water and refrigerant flow separately inside.
[0031] The condenser may include a second tube provided inside the housing. Washing water may flow through the second tube.
[0032] The second tube may be provided in multiple units that are separated from each other and disposed inside the housing. The second tube may be arranged so that its longitudinal direction is parallel to the longitudinal direction of the housing.
[0033] The total flow cross-sectional area of a plurality of second tubes may be equal to or greater than the flow cross-sectional area of the washing water pipe connecting the washing pump that transports washing water and the second tubes.
[0034] The inner diameter of the second tube may be configured to decrease as it approaches the center of the housing.
[0035] The outer diameter of the second tube may be configured to decrease as it moves along the flow direction of the washing water.
[0036] The outer diameter of the second tube may be configured to decrease as it moves along the flow direction of the washing water. Specifically, the condenser may be configured such that the outer diameter of the second tube decreases as it moves from the inlet region where the washing water flows in to the outlet region where the washing water is discharged.
[0037] The condenser may include an inlet portion through which refrigerant flows into the housing. The inlet portion may protrude from the housing. The condenser may include an outlet portion through which refrigerant is discharged from the housing. The outlet portion may protrude from the housing.
[0038] The inlet and outlet sections can be spaced apart from each other along the longitudinal direction of the housing.
[0039] The condenser may include a refrigerant flow guide that forms a refrigerant flow path. The refrigerant flow guide may be formed inside the housing.
[0040] A refrigerant flow guide may be provided to extend the flow length of the refrigerant in the housing by blocking the flow of the refrigerant and changing the direction of flow.
[0041] The dishwasher may include a fitting socket, one side of which is connected to a housing. The fitting socket may be provided such that the diameter of the side connected to the housing is larger than that of the other side.
[0042] The fitting socket may include a first cell connected to a condenser. The fitting socket may include a second cell disposed on the other side of the first cell.
[0043] The fitting socket may include a third cell positioned between the first cell and the second cell. The diameter of the third cell may gradually decrease as it approaches the second cell.
[0044] The refrigerant flow guide can be positioned at a location spaced apart from the inlet and outlet sections along the longitudinal direction of the housing.
[0045] The refrigerant flow guide may protrude from the inner wall surface of the housing. The refrigerant flow guide may be positioned to protrude in a direction intersecting the longitudinal direction of the housing. Effects of the invention
[0046] In the dishwasher according to the present invention, foreign substances contained in the washing water can be filtered by a filter when passing through the through hole and the maximum diameter is larger than the diameter of the through hole. Accordingly, foreign substances contained in the washing water that flows into the condenser after passing through the through hole may have a maximum diameter smaller than the diameter of the through hole.
[0047] The first distance, which is the width of the cleaning water flow space in the condenser, may be greater than the maximum diameter of foreign matter introduced into the condenser. Accordingly, the foreign matter may flow smoothly through a cleaning water flow space larger than itself and may not adhere to the surface of the housing or the first tube. As a result, the accumulation of foreign matter in the cleaning water flow space of the condenser can be effectively suppressed.
[0048] In addition, in the dishwasher according to the present invention, in the coil-tube type condenser, the first distance and the second distance may be formed to be larger than the diameter of the through hole. As a result, the accumulation of foreign substances introduced into the condenser on the surface of the coil or the inner surface of the housing can be effectively suppressed. Consequently, the accumulation of foreign substances in the washing water flow space of the condenser can be effectively suppressed.
[0049] In addition, in the dishwasher according to the present invention, at least one of the first distance or the second distance may be provided with a diameter of 1.5 to 2.5 times the diameter of the through hole.
[0050] Due to this structure, foreign substances can flow smoothly through a space sufficiently wide relative to their size in the condenser's cleaning water flow space. Furthermore, since the first or second distance is sufficiently large, even if the first or second distance becomes slightly smaller than the design value due to the installation or operation of the condenser, a sufficient space of size for foreign substances to pass through smoothly can be secured.
[0051] Accordingly, the accumulation of foreign substances in the cleaning water flow space of the condenser can be effectively suppressed.
[0052] In addition, in the dishwasher according to the present invention, the inner diameter of the second tube may be provided to decrease as it approaches the center of the housing.
[0053] In this way, the flow rate of the washing water can be made uniform across the entire plurality of tubes when viewed in the diameter direction of the housing. Additionally, by reducing the diameter of the second tube in the center of the housing, the flow cross-sectional area of the washing water in the second cell of the fitting socket and the total flow cross-sectional area of the washing water in the second tube of the condenser can be made similar.
[0054] Due to this structure, the heat exchange performance between the refrigerant and the wash water in the condenser can be improved.
[0055] In addition, in the dishwasher according to the present invention, the outer diameter of the second tube may be provided to decrease as it moves along the flow direction of the washing water.
[0056] Therefore, as the outer diameter of the second tube increases in the inlet region of the condenser, the heat exchange area of the second tube can increase accordingly. Consequently, the amount of heat exchange in the inlet region of the condenser can increase. As a result, the heat exchange performance of the condenser can be effectively improved.
[0057] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing
[0058] FIG. 1 is a cross-sectional view of a dishwasher according to one embodiment. FIG. 2 is a drawing for explaining a part placed on a base in a dishwasher according to one embodiment. Figure 3 is a plan view showing the lid of the tub. FIG. 4 is a perspective view showing a part of a condenser according to one embodiment. Figure 5 is a cross-sectional view of Figure 4. FIG. 6 is a perspective view showing a part of a condenser according to another embodiment. Figure 7 is a cross-sectional view of Figure 6. Figure 8 is a drawing showing a part of the coil in the condenser illustrated in Figure 6. FIG. 9 is a perspective view showing a part of a condenser according to another embodiment. FIG. 10 is a cross-sectional view showing a condenser according to another embodiment. Specific details for implementing the invention
[0059] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.
[0060] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.
[0061] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.
[0062] Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.
[0063] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.
[0064] In the specifications, terms such as "top," "bottom," and "side" are used to refer to parts or directions of the dishwasher as it is installed for general use.
[0065] FIG. 1 is a cross-sectional view of a dishwasher according to one embodiment. A dishwasher according to one embodiment may include a case (11) forming an exterior, a tub (12) in which dishes to be washed are received, a door (20) provided on the front of the tub (12) to open and close the tub (12), and a sump (100) provided on the lower side of the tub (12) in which washing water is stored.
[0066] Additionally, the dishwasher may include a plurality of spray arms (13, 14, 15) provided in a tub (12) for spraying washing water, a filter (110) provided in a sump (100) for filtering washing water sprayed from at least one of the plurality of spray arms (13, 14, 15) and recovered to the sump (100), a washing pump (150) for transporting washing water stored in the sump (100), and a switching valve (130) for flowing washing water transported by the washing pump (150) to at least one of the plurality of spray arms (13, 14, 15).
[0067] The tub (11) is formed in the shape of a cuboid with an open front, and a washing chamber (12a) can be formed inside. A communication hole is formed in the bottom (12b) of the tub (11) through which washing water flows into the sump (100). The washing chamber (12a) is provided with a plurality of racks (16, 17) for storing items to be washed. The plurality of racks (16, 17) may include a lower rack (16) positioned at the bottom of the washing chamber (12a) and an upper rack (17) positioned at the top. The lower rack (16) and the upper rack (17) are spaced apart vertically and can be slid out toward the front of the tub (11).
[0068] A plurality of spray arms (13, 14, 15) are arranged in an up-and-down direction. The plurality of spray arms (13, 14, 15) may include a lower spray arm (13) positioned at the bottom and spraying washing water from the bottom to the top toward the lower rack (16), an upper spray arm (14) positioned above the lower spray arm (13) and spraying washing water from the bottom to the top toward the upper rack (17), and a tower spray arm (15) positioned at the top of the washing room (12a) above the upper spray arm (14) and spraying washing water from the top to the bottom.
[0069] A plurality of spray arms (13, 14, 15) receive washing water from a washing pump (150) through a plurality of spray arm connecting channels (18, 19, 21). The plurality of spray arm connecting channels (18, 19, 21) may include a lower spray arm connecting channel (18) connected to a lower spray arm (13), an upper spray arm connecting channel (19) connected to an upper spray arm (14), and a tower spray arm connecting channel (21) connected to a tower spray arm (15).
[0070] The lower sandstone (13), upper sandstone (14) and tower sandstone (15) can each receive washing water from the washing pump (150) through the upper sandstone connecting channel (18), upper sandstone connecting channel (19), and tower sandstone connecting channel (21).
[0071] A sump (100) is positioned below the bottom (12b) of a tub (12) to collect wash water. A filter (110) can filter contaminants from the wash water moving from the tub (12) to the sump (100).
[0072] Washing water sprayed through multiple spray arms (13, 14, 15) falls to the bottom (12b) of the tub (12) along with contaminants adhering to the object to be washed. Accordingly, the dishware containing contaminants passes through a filter (110) arranged to communicate with the bottom (12b) of the tub (12), thereby filtering out the contaminants and allowing it to be stored in the sump (100).
[0073] During the washing operation, the washing water can wash dishes contained in the rack (16, 17) while circulating through the sump (100), spray arms (13, 14, 15), tub (12), and filter (110).
[0074] The washing pump (150) supplies washing water stored in the sump (100) to at least one of a plurality of spray arms (13, 14, 15). The washing pump (150) may include a washing motor that generates rotational force and an impeller that is rotated by the washing motor to transport washing water. The washing pump (150) may be connected to a switching valve (130) and a washing water supply path (180).
[0075] When the washing pump (150) is driven, the washing water stored in the sump (100) flows into the washing pump (150) through the collection channel (170) and can then be transferred to the switching valve (130) through the washing water supply channel (180).
[0076] The switching valve (130) selectively supplies washing water, which is transported by the washing pump (150), to at least one of the lower part sand arm (13), the upper part sand arm (14), and the top part sand arm (15). The switching valve (130) can selectively connect at least one of the washing water supply path (180) and the plurality of sand arm connection paths (18, 19, 21).
[0077] The sump (100) is connected to a water supply channel (23) through which washing water supplied from an external water source flows. The water supply channel (23) may be equipped with a water supply valve (22) that controls the washing water supplied from the external water source. The water supply valve (22) can supply washing water from the external water source to the sump (100). When the water supply valve (22) is opened, the washing water supplied from the external water source can flow into the sump (100) through the water supply channel (23).
[0078] A sump (100) may be connected to a drain channel (24) that drains washing water to the outside of the dishwasher. A drain pump (25) that drains washing water within the sump (100) through the drain channel (24) may be provided in the drain channel (24). When the drain pump (25) is operated, washing water stored in the sump (100) can be drained to the outside of the case (11) through the drain channel (24).
[0079] A heating device for heating the washing water may be provided inside the sump (100) or in the washing pump (150). The heating device may be provided, for example, as an electric heater, a heat pump system, etc.
[0080] In the embodiment, the washing water can be heated using a heat pump system. The heat pump system will be described first below.
[0081] A heat pump system is a system that pumps heat from a low-temperature environment to a high-temperature environment. At this time, such heat pumping can be implemented, for example, using a compressor (500). In an embodiment, a heat pump system can be implemented using a so-called two-phase flow refrigeration cycle, in which the temperature of the refrigerant is raised by compressing the two-phase flowing refrigerant in a gaseous state using a compressor (500).
[0082] A heat pump system carrying out a two-phase flow refrigeration cycle may include a compressor (500), a condenser (300), an expansion device, and an evaporator (600). Each of these components is connected to one another by piping, and as the refrigerant flows and circulates through these components, a phase change occurs and the temperature changes, allowing it to absorb heat from the surroundings or release heat to the surroundings.
[0083] The refrigerant may be introduced into the compressor (500) in a low-temperature gaseous state. In the compressor (500), the refrigerant may be compressed. At the outlet of the compressor (500), the refrigerant may be introduced into the condenser (300) in a superheated gaseous state at high temperature and high pressure.
[0084] The condenser (300) may be positioned below the tub (12). Washing water and refrigerant may flow through the condenser (300).
[0085] In the condenser (300), the refrigerant and the washing water can flow separately. The refrigerant flows into the condenser (300) and exchanges heat with the washing water, and the washing water can be heated by receiving heat from the refrigerant.
[0086] The refrigerant can undergo a phase change from a superheated gaseous state to a saturated state where liquid and gas coexist while maintaining the same pressure in the condenser (300).
[0087] The refrigerant is introduced into the condenser (300) in a superheated state and transfers heat to the washing water, causing the temperature to drop. When it reaches a saturated state, the proportion of liquid can theoretically increase gradually at the same temperature. During this liquefaction process, the refrigerant releases a large amount of heat of liquefaction, and the washing water can be heated by receiving this heat.
[0088] The refrigerant may be introduced into the expansion device in a saturated liquid or super-cooled liquid state from the condenser (300). This expansion device may be equipped with, for example, an expansion valve or a capillary device.
[0089] The refrigerant can undergo adiabatic expansion in the expansion device, that is, theoretically, an expansion with the same enthalpy. During this expansion process, a portion of the refrigerant vaporizes, and consequently, the pressure of the refrigerant can be lowered. As a portion of the refrigerant vaporizes and releases heat of vaporization to the surroundings, the temperature of the entire refrigerant can be lowered. In other words, as the refrigerant passes through the expansion device, it can enter the evaporator (600) in a low-temperature and low-pressure state.
[0090] The refrigerant introduced into the evaporator (600) can gradually increase the proportion of gas while absorbing heat from the surroundings, which are at a relatively high temperature. In the evaporator (600), the proportion of gas can gradually increase while theoretically maintaining the same pressure and the same temperature.
[0091] The refrigerant discharged from the evaporator (600) may flow into the compressor (500) with some liquid present or slightly superheated. The refrigerant flowing into the compressor (500) may circulate through the compressor (500), condenser (300), expansion device, and evaporator (600) while repeating the process described above.
[0092] Typically, a refrigeration device is a device that utilizes the absorption of heat by a refrigerant in an evaporator (600). The heat pump system of the embodiment can utilize the heat released by the refrigerant in a condenser (300).
[0093] In a heat pump system, heat exchange occurs between a high-temperature refrigerant and a relatively low-temperature washing water in a condenser (300), and the washing water can be heated accordingly. The high-temperature washing water heated by the condenser (300) can wash or rinse dishes more easily compared to when it is at room temperature.
[0094] Meanwhile, this heat pump system does not need to always operate while the dishwasher is running. For example, when washing or rinsing with room temperature water, the compressor (500) is not operated, so that room temperature water can be sprayed onto the dishes without heating the washing water.
[0095] Even when the compressor (500) is stopped and the washing water is not heated, the washing water can pass through the condenser (300) and circulate throughout the dishwasher.
[0096] In another embodiment, by forming a bypass path that bypasses the condenser (300), the cleaning water can be diverted through the bypass path when the compressor (500) stops operating, thereby improving the performance of the condenser (300) and extending its lifespan.
[0097] FIG. 2 is a drawing for explaining the parts placed on the base (30) in a dishwasher according to one embodiment. The parts constituting the heat pump system may be placed, for example, on the lower side of the tub (12).
[0098] The dishwasher may include a base (30) provided on the lower side of the tub (12). A heat pump system and other devices for driving the dishwasher may be placed on the base (30). The base (30) forms a space on the lower side of the tub (12), and this space may become a machine room where various machine parts are placed.
[0099] The dishwasher may include a mounting portion (40) on which a condenser (300) is mounted. The mounting portion (40) may be placed on the base (30). The mounting portion may be placed on the lower side of the tub (12).
[0100] The mounting portion (40) can generally be formed in a plate shape. Various parts can be attached to the upper surface of the mounting portion (40).
[0101] The mounting part (40) can be placed inside the base (30). The base (30) can be easily separated from the base (30). For example, the mounting part (40) can be mounted to the base (30) by a fastening mechanism. The mounting part (40) can be separated from the base (30) by releasing the fastening mechanism and sliding it as shown by the arrow in FIG. 2.
[0102] Alternatively, the mounting part (40) may be provided to be guided by a guide rail formed on the inner side of the base (30) and to slide from the base (30).
[0103] A condenser (300) can be placed in a mounting portion (40). A refrigerant and a cleaning water can flow separately in the condenser (300). The refrigerant can be condensed in the condenser (300). As the refrigerant condenses, it releases heat of liquefaction, and the cleaning water can be heated by the released heat of liquefaction.
[0104] Although not shown, the expansion valve can be placed in a suitable location on the mounting part (40). Since the expansion valve is small compared to other parts, it can be placed in a suitable space on the mounting part (40).
[0105] The dishwasher may include a water softening unit (41) that produces soft water. The water softening unit (41) may be mounted on a mounting unit (40). Soft water is water that has a very low content of minerals such as calcium and magnesium, or is water that does not contain them. When washing with soft water, the washing efficiency of the dishes can be improved, and the lifespan of the dishes can also be increased. Therefore, it is necessary to wash with soft water as needed.
[0106] In the embodiment, washing water is introduced into the water softening unit (41), and after being softened using the water softening unit (41), it can be used for dishwashing. However, the water softening unit (41) is not an essential component of the dishwasher.
[0107] The water softening section (41) can be connected to the sump (100) via piping. Therefore, water flowing into the water softening section (41) can be softened by the water softening section (41). The softened water discharged from the water softening section (41) can flow into the sump (100) and be used for cleaning.
[0108] The dishwasher may include a sump (100) in which wash water is stored. The sump (100) may be mounted on a mounting portion (40). The sump (100) may be positioned on the lower side of a tub (12).
[0109] Washing water stored in the sump (100) can be flowed by the washing pump (150) to wash dishes contained in the tub (12) while circulating through the sump (100), washing pump (150), a plurality of spray arms (13, 14, 15), and tub (12).
[0110] Of course, the washing water can be heated by a heat pump system and sprayed from a plurality of spray arms (13, 14, 15) at a high temperature to wash or rinse dishes contained in the tub (12), thereby improving washing efficiency.
[0111] Additionally, a cleaning pump (150) may be mounted on the mounting portion (40). Additionally, a compressor (500) may be mounted on the mounting portion (40). The compressor (500) may be connected to a condenser (300). The compressor (300) may compress a refrigerant.
[0112] In addition, an evaporator (600) can be mounted on the mounting part (40).
[0113] As described above, the compressor (500), condenser (300), expansion device, and evaporator (600) constituting the heat pump system are connected to each other by piping, and the refrigerant circulates through each component, undergoing a phase change and changing temperature and pressure.
[0114] Meanwhile, when the washing pump (150) is operated, the washing water flows sequentially through the washing pump (150), the condenser (300), the plurality of spray arms (13, 14, 15), the tub (12), and the sump (100), and then flows back into the washing pump (150) to circulate through the aforementioned components again.
[0115] In FIG. 2, a shell-tube type condenser (300) is shown. However, the condenser (300) may be provided in various other shapes and structures. The condenser (300) may be provided in a so-called tube-in-tube type, a shell-coil type, a shell-tube type, etc.
[0116] Below, the structure and features of the present invention are described for each type of condenser (300).
[0117] FIG. 3 is a plan view showing the lid (12c) of the tub (12). The lid (12c) may form part of the bottom (12b) of the tub (12). The lid (12c) may separate the tub (12) from the sump (100). The lid (12c) may be provided to be detachably attached to the tub (12).
[0118] A filter (110) can be attached to the lid (12c). Therefore, when the lid (12c) is removed from the tub (12), the filter (110) can also be removed from the tub (12).
[0119] The lid (12c) can serve as a screen filter. The surface of the lid (12c) is formed with a mesh structure with smaller gaps than the mesh of the filter (110), so that water from the tub (12) can be drained into the lower sump (100) and can serve as a filtering means, but it is very fine and is not disclosed in the drawing. This mesh is only for helping with drainage, and the filter (110) performs the actual filtering role of the wash water circulating in the dishwasher.
[0120] A mesh-shaped connecting section may be formed on the upper part of the filter (110). Through this connecting section, the washing water sprayed from the tub (12) to wash dishes and falling onto the bottom (12b) of the tub (12) can flow into the sump (100). This connecting section may be provided with a plurality of holes (111) through which the washing water passes. The plurality of holes (111) may be spaced apart from each other in the horizontal and vertical directions of the connecting section.
[0121] The through hole (111) can serve to filter out foreign matter accumulated on the bottom (12b) of the tub (12) so that it does not flow into the sump (100). However, if the diameter of the through hole (111) is too small, the washing water may not flow smoothly into the sump (100). Therefore, some of the foreign matter contained in the washing water that is small in size may pass through the through hole (111) and flow into the sump (100).
[0122] Foreign substances contained in the washing water introduced into the sump (100) can enter the condenser (300) as they circulate through the washing water circulation system. If such foreign substances accumulate inside the condenser (300), they can obstruct the heat exchange between the refrigerant and the washing water in the condenser (300) and obstruct the flow of the washing water.
[0123] Therefore, it is necessary to prevent these foreign substances from being discharged from the condenser (300) and from accumulating in the condenser (300).
[0124] FIG. 4 is a perspective view showing a part of a condenser (300) according to one embodiment. FIG. 5 is a cross-sectional view of FIG. 4. FIG. 4 shows a double-tube type condenser (300).
[0125] The condenser (300) may include a housing (310) that forms the outer shape. The housing (310) may be configured so that cleaning water and refrigerant flow separately inside. A first tube (320a) may be accommodated inside the housing (310).
[0126] The housing (310) can generally be formed in a cylindrical shape with a space formed inside. The housing (310) can be formed from a sturdy material with excellent corrosion resistance, such as copper, aluminum, or stainless steel.
[0127] The condenser (300) may include a first tube (320a) provided inside the housing (310). Refrigerant may flow through the first tube (320a). The first tube (320a) may be formed, for example, as a pipe having a cylindrical cross-section and a hollow interior.
[0128] Meanwhile, to increase the heat exchange area between the refrigerant and the cleaning water, the housing (310) and the first tube (320a) may be extended in length. At this time, to reduce the volume of the condenser (300), the entire condenser (300) may be bent at appropriate locations to form a zigzag shape overall.
[0129] Washing water can flow from the condenser (300) into the space between the inner surface of the housing (310) and the outer surface of the first tube (320a). Foreign substances contained in the washing water can flow in this washing water flow space.
[0130] Foreign substances may adhere to and accumulate on the surface of the housing (310) or the first tube (320a) in the washing water flow space. Therefore, it is necessary to prevent foreign substances from accumulating here.
[0131] Accordingly, in the embodiment, the first distance (D1), defined as the shortest straight distance between the inner surface of the housing (310) and the outer surface of the first tube (320a), may be provided to be larger than the diameter of the through hole (111) formed in the filter (110) through which the cleaning water passes.
[0132] Foreign substances contained in the washing water can be filtered by the filter (110) when the maximum diameter is larger than the diameter of the through hole (111) as they pass through the through hole (111). Therefore, foreign substances contained in the washing water that flows into the condenser (300) after passing through the through hole (111) may have a maximum diameter smaller than the diameter of the through hole (111).
[0133] The first distance (D1), which is the width of the washing water flow space in the condenser (300), may be larger than the maximum diameter of the foreign substance introduced into the condenser (300). Accordingly, the foreign substance may flow smoothly through the washing water flow space that is larger than itself and may not adhere to the surface of the housing (310) or the first tube (320a). As a result, the accumulation of foreign substances in the washing water flow space of the condenser (300) can be effectively suppressed.
[0134] Referring to FIG. 1, the filter (110) may further include a cup-shaped mesh structure in addition to a structure in which a through hole (111) is formed in the connecting part. Accordingly, foreign substances that pass through the through hole (111) are caught once again in the cup-shaped mesh structure, and finally, the maximum diameter of the foreign substances that pass through the filter (110) and enter the condenser (300) can be much smaller than the diameter of the through hole (111).
[0135] Therefore, if the first distance (D1) is formed to be larger than the diameter of the through hole (111), the size of the foreign substance introduced into the condenser (300) will be much smaller than the first distance (D1). Accordingly, by forming the first distance (D1) to be larger than the diameter of the through hole (111), a significant effect can be seen in suppressing the accumulation of foreign substances inside the condenser (300).
[0136] FIG. 6 is a perspective view showing a part of a condenser (300) according to another embodiment. FIG. 7 is a cross-sectional view of FIG. 6. FIG. 8 is a drawing showing a part of a coil (321) in the condenser (300) illustrated in FIG. 6. A shell-coil type condenser (300) is illustrated in FIG. 6.
[0137] The first tube (320a) may be placed inside the housing (310) in the form of a spiral coil (321). A refrigerant may flow through the first tube (320a). A cleaning water flow space may be formed between the outer surface of the first tube (320a) and the inner surface of the housing (310) through which cleaning water flows.
[0138] By forming the first tube (320a) in the shape of a spiral coil (321), the overall volume of the condenser (300) can be reduced. At the same time, there is an advantage that the heat exchange area of the first tube (320a) can be significantly increased compared to the total volume of the condenser (300).
[0139] In the shell-coil type condenser (300), the first distance (D1), defined as the shortest straight distance between the inner surface of the housing (310) and the outer surface of the first tube (320a), may be provided to be larger than the diameter of the through hole (111). A detailed explanation of this is as described above.
[0140] In a shell-coil type condenser (300), a second distance (D2), defined as the shortest straight distance between the outer surfaces of adjacent coils (321), may be provided to be larger than the diameter of the through hole (111). At this time, adjacent coils (321) mean that one coil (321) is wound in a screw-like shape and arranged so that one part of the coil (321) and another part of the coil (321) are adjacent to each other.
[0141] In a shell-coil type condenser (300), foreign matter may get stuck between adjacent coils (321). Therefore, the second distance (D2) between adjacent coils (321) can be provided to be larger than the diameter of the through hole (111), just like the first distance (D1).
[0142] Accordingly, foreign substances can flow smoothly between adjacent coils (321) that form a space larger than themselves, so as not to adhere to the surface of the coils (321). As a result, the accumulation of foreign substances in the cleaning water flow space of the condenser (300) can be effectively suppressed.
[0143] In a shell-coil type condenser (300), the first distance (D1) and the second distance (D2) can be formed larger than the diameter of the through hole (111). As a result, foreign substances introduced into the condenser (300) can be effectively prevented from accumulating on the surface of the coil (321) or the inner surface of the housing (310). Consequently, the accumulation of foreign substances in the cleaning water flow space of the condenser (300) can be effectively prevented.
[0144] In the embodiment, the condenser (300) may be manufactured with a first distance (D1) and a second distance (D2) as designed values. However, during the process of installing the condenser (300) in the dishwasher or during the use of the dishwasher, deformation may occur in the condenser (300), causing the first distance (D1) or the second distance (D2) to become smaller than the designed values.
[0145] Considering this, it is necessary to make the first distance (D1) or the second distance (D2) sufficiently larger than the diameter of the through hole (111) to effectively suppress the accumulation of foreign matter in the washing water flow space of the condenser (300).
[0146] Accordingly, in the embodiment, at least one of the first distance (D1) or the second distance (D2) may be provided at a diameter of 1.5 to 2.5 times the diameter of the through hole (111).
[0147] The shape of the through hole (111) of the filter (110) may be square or rhombus-shaped in addition to circular. Assuming the shape of the through hole (111) of the filter (110) is square, the size of the diagonal will be 1.4 times (square root of 2) the length of one side. Therefore, considering the tolerance, the minimum value is set to 1.5 times. Even in the case where the through hole (111) is circular, it is appropriate to set the minimum value to 1.5 times, taking into account that foreign matter passing through the through hole (111) swells up and increases in volume due to the washing water.
[0148] Due to this structure, foreign substances can flow smoothly through a space sufficiently wide relative to their size in the washing water flow space of the condenser (300). Additionally, since the first distance (D1) or the second distance (D2) is sufficiently large, even if the first distance (D1) or the second distance (D2) becomes slightly smaller than the design value due to the installation or operation of the condenser (300), a space large enough for foreign substances to pass through smoothly can be sufficiently secured.
[0149] Accordingly, the accumulation of foreign substances in the washing water flow space of the condenser (300) can be effectively suppressed.
[0150] The cross-sectional area of the washing water flow of the condenser (300) may be equal to or larger than the cross-sectional area of the washing water pipe connecting the washing pump (150) that transports the washing water and the condenser (300).
[0151] The cross-sectional area of the washing water flow of the condenser (300) may be the area obtained by subtracting the cross-sectional area of the outer circumference of the first tube (320a) from the cross-sectional area of the space in the inner circumference of the housing (310), for example, in the case of the condenser (300) illustrated in FIGS. 4 and 5.
[0152] By making the flow cross-sectional area of the washing water in the condenser (300) equal to or larger than the flow cross-sectional area of the washing water pipe, the pressure of the incoming washing water can be prevented from increasing inside the condenser (300).
[0153] Thus, it is possible to prevent the flow rate inside the condenser (300) from increasing due to the increase in pressure. In addition, this allows the heat exchange time between the refrigerant and the cleaning water to be increased. Therefore, the heat exchange performance in the condenser (300) can be effectively improved.
[0154] FIG. 9 is a perspective view showing a part of a condenser (300) according to another embodiment. FIG. 10 is a cross-sectional view showing a condenser (300) according to another embodiment. FIG. 9 shows a shell-tube type condenser (300).
[0155] In FIGS. 9 and 10, the arrows indicate the flow direction of the washing water. Below, the common structure of the condenser (300) shown in FIGS. 9 and 10 will be described first.
[0156] The condenser (300) may include a housing (310) that forms the outer shape. The housing (310) may be configured so that cleaning water and refrigerant flow separately inside. A second tube (320b) may be accommodated inside the housing (310).
[0157] The housing (310) can generally be formed in a cylindrical shape with an internal space. The housing (310) can be formed from a robust material with excellent corrosion resistance, such as copper, aluminum, or stainless steel, so as to withstand high-pressure refrigerant.
[0158] A space through which a refrigerant flows may be formed inside the housing (310). As high-temperature refrigerant flows into this space, heat may be dissipated to the outside of the housing (310). Since such heat dissipation degrades the performance of the condenser (300), an insulating material may be provided on the outer surface of the housing (310) to surround the housing (310) in order to suppress external heat dissipation.
[0159] The condenser (300) may include a second tube (320b) provided inside the housing (310). Washing water may flow through the second tube (320b).
[0160] The second tube (320b) may be provided in multiple units that are separated from each other and disposed inside the housing (310). The second tube (320b) may be formed, for example, as a pipe with a cylindrical cross-section and a hollow interior.
[0161] Each second tube (320b) may be spaced apart from each other. Specifically, each second tube (320b) may be spaced apart from each other in the diameter direction of the housing (310).
[0162] By providing multiple second tubes (320b), the contact area between the refrigerant and the washing water, i.e., the heat exchange area, can be improved. Additionally, as a result, uniform heat exchange occurs throughout the flowing refrigerant and washing water, thereby improving heat exchange efficiency.
[0163] The condenser (300) can be positioned so that its length direction is oriented toward the side of the dishwasher. The internal space of the base (30) on which the condenser (300) is positioned can be formed with a relatively narrow width in the vertical direction of the dishwasher and a relatively wide width in the lateral direction. This structure is formed to save the overall volume of the dishwasher.
[0164] Considering the structure of the internal space of the base (30), the condenser (300) can be positioned along the side of the dishwasher in the longitudinal direction. Accordingly, the condenser (300) can be efficiently positioned in the internal space of the relatively narrow base (30).
[0165] The condenser (300) may include an inlet portion (331) through which refrigerant flows into the housing (310). The inlet portion (331) may protrude from the housing (310). The condenser (300) may include an outlet portion (332) through which refrigerant is discharged from the housing (310). The outlet portion (332) may protrude from the housing (310).
[0166] For example, as shown in FIGS. 9 and 10, the inlet (331) and the outlet (332) may be formed in the shape of pipes having a predetermined length that protrudes in a direction intersecting the longitudinal direction of the housing (310).
[0167] One end of the inlet section (331) and the outlet section (332) can be connected to a pipe through which refrigerant flows.
[0168] The inlet (331) and the protrusion can be positioned in relation to the flow direction of the washing water and the refrigerant.
[0169] For example, if designed as an opposing type condenser (300) in which the flow directions of the washing water and the refrigerant are opposite to each other, the inlet section (331) may be positioned in a location adjacent to the outlet of the washing water in the condenser (300), and the outlet section (332) may be positioned in a location adjacent to the inlet of the washing water in the condenser (300).
[0170] As another example, when the condenser (300) is designed such that the flow directions of the washing water and the refrigerant are the same, the inlet section (331) may be positioned in a location adjacent to the inlet of the washing water in the condenser (300), and the outlet section (332) may be positioned in a location adjacent to the outlet of the washing water in the condenser (300).
[0171] The inlet section (331) and the outlet section (332) may be spaced apart from each other along the longitudinal direction of the housing (310). Since the refrigerant introduced into the housing (310) may not flow and may stagnate in the corners of the housing (310), it is necessary to position the inlet section (331) and the outlet section (332) in a way that can reduce such stagnation areas.
[0172] The condenser (300) may be positioned along the side of the dishwasher in a longitudinal direction. Accordingly, the inlet (331) and the outlet (332) may be positioned spaced apart from each other along the side of the dishwasher.
[0173] Since the refrigerant introduced into the housing (310) may not flow and may become stagnant in the corners of the housing (310), it is necessary to position the inlet (331) and outlet (332) to reduce such stagnant areas.
[0174] The inlet section (331) and the outlet section (332) can be positioned adjacent to each of the two ends of the condenser (300). With this structure, the area where the refrigerant does not flow and remains stagnant at each corner inside the housing (310) can be reduced.
[0175] However, the inlet section (331) and the outlet section (332) may be provided at a location that avoids the position where the refrigerant flow guide (340) is placed in order to ensure smooth flow of the refrigerant.
[0176] The condenser (300) may include a refrigerant flow guide (340) that forms a refrigerant flow path. The refrigerant flow guide (340) may be formed inside the housing (310).
[0177] The refrigerant flow guide (340) may be provided to block the flow of the refrigerant and change the direction of flow to extend the flow length of the refrigerant in the housing (310).
[0178] A refrigerant flow guide (340) can be placed in the refrigerant flow path to block the flow of the refrigerant. The refrigerant may hit the refrigerant flow guide (340) and change its flow path. Since the refrigerant flows by bypassing the refrigerant flow guide (340), the length of the refrigerant flow path inside the housing (310) can be extended.
[0179] In an embodiment, a refrigerant flow guide (340) may be provided inside the housing (310). The refrigerant flow guide (340) can block the flow of the refrigerant to change the flow path of the refrigerant. Accordingly, the flow length of the refrigerant may be extended. As a result, the heat exchange efficiency between the refrigerant and the washing water in the condenser (300) may be improved. Therefore, the performance of the heat pump system and the dishwasher equipped with it may be improved.
[0180] The refrigerant flow guide (340) may be positioned at a location spaced apart from the inlet section (331) and the outlet section (332) along the longitudinal direction of the housing (310). For example, as shown in FIG. 10, when a plurality of refrigerant flow guides (340) are provided, the inlet section (331) and the outlet section (332) may be positioned between adjacent refrigerant flow guides (340).
[0181] If the refrigerant flow guide (340) is positioned in a location that overlaps with the inlet section (331) or the outlet section (332), the refrigerant flow guide (340) may obstruct the refrigerant from flowing into the housing (310). Alternatively, the refrigerant flow guide (340) may obstruct the refrigerant from being discharged from the housing (310).
[0182] In an embodiment, the refrigerant flow guide (340) can be positioned at a location spaced apart from the inlet (331) and the outlet (332) in the housing (310). This allows the refrigerant flow guide (340) not to obstruct the inflow of refrigerant from the inlet (331) and the outlet (332). Accordingly, the flow of refrigerant in the condenser (300) can proceed smoothly.
[0183] The refrigerant flow guide (340) may protrude from the inner wall surface of the housing (310). The refrigerant flow guide (340) may be positioned to protrude in a direction intersecting the longitudinal direction of the housing (310).
[0184] The refrigerant introduced into the housing (310) can flow along the longitudinal direction of the housing (310). As the refrigerant flows in the housing (310), it can exchange heat with the cleaning water.
[0185] The refrigerant flow guide (340) protrudes to intersect the longitudinal direction of the housing (310) and can block the refrigerant flowing along the longitudinal direction of the housing (310). Therefore, the refrigerant can flow by bypassing the refrigerant flow guide (340). Accordingly, the flow length of the refrigerant in the housing (310) can be extended.
[0186] Meanwhile, the refrigerant flow guide (340) can be combined with a plurality of second tubes (320b) to support these second tubes (320b). Additionally, the refrigerant flow guide (340) can maintain a spacing between the plurality of second tubes (320b).
[0187] Referring to FIG. 10, the refrigerant flow guides (340) may be provided in multiple numbers spaced apart along the longitudinal direction of the housing (310). When multiple refrigerant flow guides (340) are provided, the flow length of the refrigerant may be further extended. Although three refrigerant flow guides (340) are shown in FIG. 10, four or more refrigerant flow guides (340) may be spaced apart from each other along the longitudinal direction of the housing (310).
[0188] Adjacent refrigerant flow guides (340) can be alternately arranged in a zigzag pattern along the longitudinal direction of the housing (310). Accordingly, the refrigerant flow guides (340) can be provided to block a portion of the refrigerant flow path formed inside the housing (310).
[0189] For example, a portion of the refrigerant flow guide (340) may be positioned at the top of the housing (310). Another portion of the refrigerant flow guide (340) may be positioned at the bottom of the housing (310). Adjacent refrigerant flow guides (340) may be positioned at different locations within the housing (310). Thus, a plurality of refrigerant flow guides (340) may be alternately positioned in a zigzag pattern along the longitudinal direction of the housing (310).
[0190] For example, the refrigerant introduced into the housing (310) may flow along the longitudinal direction of the housing (310) and be blocked by a refrigerant flow guide (340) located at the bottom of the housing (310). The refrigerant may rise and flow again along the longitudinal direction of the housing (310). The refrigerant may be blocked again by a refrigerant flow guide (340) located at the top of the housing (310). The refrigerant may descend again and flow along the longitudinal direction of the housing (310).
[0191] Accordingly, the refrigerant can sequentially flow horizontally, upward, horizontally, downward, and horizontally within the housing (310), for example. Accordingly, the flow length of the refrigerant within the housing (310) can be effectively extended.
[0192] In an embodiment, the refrigerant flow guides (340) may be provided in multiple numbers. The multiple refrigerant flow guides (340) may be spaced apart from each other along the longitudinal direction of the housing (310). The multiple refrigerant flow guides (340) may be arranged alternately in a zigzag pattern along the longitudinal direction of the housing (310).
[0193] Due to this structure, the refrigerant in the housing (310) can be blocked by a plurality of refrigerant flow guides (340), allowing the flow direction to be changed multiple times. Accordingly, the flow length of the refrigerant in the housing (310) can be effectively extended. As a result, the heat exchange performance between the refrigerant and the cleaning water in the condenser (300) can be improved.
[0194] The dishwasher may include a fitting socket (400) on one side that is connected to a housing (310). The fitting socket (400) may be provided such that the diameter of the side connected to the housing (310) is larger than that of the other side.
[0195] The fitting sockets (400) may be provided as a pair connected to each side of the condenser (300). The pair of fitting sockets (400) may be provided to have a shape symmetrical with respect to the condenser (300).
[0196] The fitting socket (400) can connect the housing (310) of the condenser (300) with a large diameter and the cleaning water pipe with a small diameter. Cleaning water can flow from the cleaning water pipe into the housing (310).
[0197] Additionally, the washing water can be discharged from the housing (310) and flow into the washing water pipe. The fitting socket (400) can connect the housing (310) and the washing water pipe with different diameters.
[0198] The fitting socket (400) may include a first cell (410) connected to a condenser (300). The first cell (410) may have a larger diameter than the second cell (420). The fitting socket (400) may include a second cell (420) positioned on the other side of the first cell (410). The second cell (420) may have a smaller diameter than the first cell (410).
[0199] The fitting socket (400) may include a third cell (430) positioned between the first cell (410) and the second cell (420). The diameter of the third cell (430) may gradually decrease as it approaches the second cell (420). The diameter of the third cell (430) may gradually decrease along the direction of flow of the washing water.
[0200] As the washing water passes through the third cell (430), the flow cross-sectional area may gradually increase or decrease due to the structure of the third cell (430). Due to this structure, the flow of washing water discharged from the condenser (300) can be relatively stabilized compared to cases where the flow cross-sectional area rapidly increases or decreases. Accordingly, the flow resistance of the washing water can be reduced.
[0201] Therefore, the flow cross-sectional area of the cleaning water flowing into the tube accommodated in the housing (310) of the condenser (300) can gradually increase as it passes through the fitting socket (400). Thus, the cleaning water can flow smoothly into the condenser (300).
[0202] Additionally, the flow cross-sectional area of the washing water discharged from the condenser (300) can be gradually reduced as it passes through the fitting socket (400). Therefore, the washing water can be discharged smoothly from the condenser (300). Furthermore, the washing water can flow smoothly in the subsequent washing water piping.
[0203] The total flow cross-sectional area of the plurality of second tubes (320b) may be equal to or greater than the flow cross-sectional area of the washing water pipe connecting the washing pump (150) that transports washing water and the second tubes (320b). The total flow cross-sectional area of the second tubes (320b) refers to the washing water flow cross-sectional area of the condenser (300).
[0204] As described above, by making the flow cross-sectional area of the washing water in the condenser (300) equal to or larger than the flow cross-sectional area of the washing water pipe, it is possible to prevent the pressure of the incoming washing water from increasing inside the condenser (300).
[0205] Thus, it is possible to prevent the flow rate inside the condenser (300) from increasing due to the increase in pressure. In addition, this allows the heat exchange time between the refrigerant and the cleaning water to be increased. Therefore, the heat exchange performance in the condenser (300) can be effectively improved.
[0206] The second tube (320b) can be positioned so that its longitudinal direction is parallel to the longitudinal direction of the housing (310). Accordingly, the cleaning water introduced into the second tube (320b) can be heated while flowing along the longitudinal direction of the housing (310).
[0207] The flow cross-sectional area of the washing water can increase as it goes from the inlet of the fitting socket (400), that is, from the second cell (420) to the first cell (410).
[0208] If the total flow cross-sectional area of the washing water in the second tube (320b) of the condenser (300) (the sum of the flow cross-sectional areas of multiple second tubes (320b)) is greater than the flow cross-sectional area of the washing water in the second cell (420) of the fitting socket (400), the transfer pressure of the washing water may be lowered. Accordingly, the flow of washing water in the second tube (320b) is not smooth, and the flow rate in each second tube (320b) may become uneven.
[0209] If the flow rate is uneven in each of the multiple second tubes (320b), the heat exchange performance in the condenser (300) may be poor. Therefore, it is necessary to make the flow cross-sectional area of the washing water in the fitting socket (400) and the total flow cross-sectional area of the washing water in the second tubes (320b) similar, and to make the flow rate of the washing water uniform in each of the second tubes (320b).
[0210] The flow rate of the cleaning water flowing into the fitting socket (400) is relatively slow due to friction with the inner wall of the fitting socket (400) in the area adjacent to the edge of the inner space of the fitting socket (400). Meanwhile, the flow rate of the cleaning water is relatively fast at the center of the inner space of the fitting socket (400).
[0211] Due to this effect, the flow rate of the washing water in the multiple second tubes (320b) is relatively slow at the edges of the housing (310) and relatively fast at the center of the housing (310).
[0212] Referring to FIG. 9, the inner diameter (ID) of the second tube (320b) may be configured to decrease towards the center of the housing (310).
[0213] For example, in the arrangement of multiple second tubes (320b), the inner diameter (ID2) of the second tube (320b) arranged adjacent to the center of the housing (310) may be smaller than the inner diameter (ID1) of the second tube (320b) arranged adjacent to the edge of the housing (310).
[0214] Due to this structure, the flow velocity is fast in the second tube (320b) at the center of the housing (310) with a small inner diameter (ID), but the flow cross-sectional area is small. Conversely, in the second tube (320b) at the edge of the housing (310) with a large inner diameter (ID), the flow velocity is slow, but the flow cross-sectional area is large.
[0215] In this way, the flow rate of the washing water can be made uniform across the entire plurality of tubes when viewed in the diametrical direction of the housing (310). Additionally, the diameter of the second tube (320b) located in the center of the housing (310) can be reduced. This allows the flow cross-sectional area of the washing water in the second cell (420) of the fitting socket (400) to be similar to the total flow cross-sectional area of the washing water in the second tube (320b) of the condenser (300).
[0216] Due to this structure, the heat exchange performance between the refrigerant and the washing water in the condenser (300) can be improved.
[0217] Meanwhile, the temperature of the washing water may be low in the inlet region (A1) of the condenser (300) and high in the outlet region (A2). The greater the temperature difference between the refrigerant and the washing water, the greater the heat exchange efficiency. Therefore, in order to increase the heat exchange performance between the refrigerant and the washing water, it is necessary to increase the heat exchange area between the refrigerant and the washing water in the inlet region (A1) of the condenser (300), where the temperature of the washing water is low.
[0218] Referring to FIG. 10, the outer diameter (OD) of the second tube (320b) may be configured to decrease as it moves along the direction of flow of the washing water. Specifically, the condenser (300) may be configured such that the outer diameter (OD) of the second tube (320b) decreases as it moves from the inlet area (A1) where the washing water flows in to the outlet area (A2) where the washing water is discharged.
[0219] In the condenser (300), the outer diameter (OD1) of the second tube (320b) in the inlet region (A1) can be larger than the outer diameter (OD2) of the second tube (320b) in the outlet region (A2).
[0220] As the outer diameter (OD) of the second tube (320b) increases in the inlet region (A1) of the condenser (300), the heat exchange area of the second tube (320b) can be increased accordingly. Therefore, the amount of heat exchange in the inlet region (A1) of the condenser (300) can be increased. As a result, the heat exchange performance of the condenser (300) can be effectively improved.
[0221] However, if the outer diameter (OD) of a plurality of second tubes (320b) is made constant in the longitudinal direction of the housing (310), the internal space of the housing (310) through which the refrigerant flows can be significantly reduced. This can reduce the amount of refrigerant flow. Consequently, the heat exchange performance of the condenser (300) may be degraded.
[0222] Accordingly, the outer diameter (OD) of the second tube (320b) can be relatively reduced in the inlet region (A1) of the condenser (300). As a result, sufficient space for the refrigerant to flow inside the housing (310) can be secured.
[0223] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration according to the present invention were not explicitly described while explaining the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized. Explanation of the symbols
[0224] Condenser (300) Housing (310) Entrance (331) Exit section (332) Refrigerant flow guide (340)
Claims
Claim 1 A dishwasher comprising: a tub for receiving dishes; a sump disposed below the tub and storing wash water; a filter mounted on the sump and filtering wash water recovered to the sump; and a condenser disposed below the tub and through which wash water and refrigerant flow, wherein the condenser comprises: a housing formed to form an outer shape and configured to allow wash water and refrigerant to flow separately inside; and a first tube provided inside the housing through which refrigerant flows, wherein a first distance defined as the shortest straight distance between the inner surface of the housing and the outer surface of the first tube is configured to be larger than the diameter of a through hole formed in the filter through which wash water passes. Claim 2 A dishwasher according to claim 1, wherein the first tube is arranged inside the housing in the form of a spiral coil, and the second distance, defined as the shortest straight distance between the outer surfaces of adjacent coils, is provided to be larger than the diameter of the through hole. Claim 3 A dishwasher according to paragraph 2, wherein at least one of the first distance or the second distance is provided with a diameter of 1.5 to 2.5 times the diameter of the through hole. Claim 4 A dishwasher according to claim 1, wherein the cross-sectional area of the washing water flow of the condenser is equal to or larger than the cross-sectional area of the washing water pipe connecting the washing pump that transports the washing water and the condenser. Claim 5 A dishwasher comprising a condenser through which wash water and refrigerant flow, wherein the condenser comprises: a housing having an outer shape and configured to allow wash water and refrigerant to flow separately inside; and a second tube configured inside the housing through which wash water flows, wherein the second tubes are configured in a plurality of portions that are separated from one another and arranged within the housing, and the portions are arranged such that their longitudinal directions are parallel to the longitudinal direction of the housing, and the total flow cross-sectional area of the plurality of second tubes is equal to or greater than the flow cross-sectional area of a wash water pipe connecting a wash pump that transports wash water and the second tubes. Claim 6 A dishwasher according to claim 5, wherein the inner diameter of the second tube decreases as it approaches the center of the housing. Claim 7 A dishwasher according to claim 5, wherein the outer diameter of the second tube decreases as it moves along the direction of flow of the washing water. Claim 8 A dishwasher according to claim 7, wherein the condenser is configured such that the outer diameter of the second tube decreases as it moves from an inlet area where the washing water flows in to an outlet area where the washing water is discharged. Claim 9 In claim 5, the condenser comprises: an inlet portion protruding from the housing and through which refrigerant flows into the housing; and an outlet portion protruding from the housing and through which refrigerant is discharged from the housing, wherein the inlet portion and the outlet portion are spaced apart from each other in the longitudinal direction of the housing, a dishwasher. Claim 10 A dishwasher according to claim 9, wherein the condenser comprises a refrigerant flow guide formed inside the housing and which blocks the flow of refrigerant to change the direction of flow and extend the length of the flow of refrigerant in the housing. Claim 11 In claim 5, the condenser comprises a fitting socket having one side connected to the housing and the diameter of the one side connected to the housing being larger than that of the other side, in a dishwasher. Claim 12 A dishwasher according to claim 11, wherein the fitting socket comprises: a first cell connected to the condenser; a second cell disposed on the other side of the first cell; and a third cell disposed between the first cell and the second cell, the diameter of which gradually decreases toward the second cell. Claim 13 A dishwasher according to claim 10, wherein the refrigerant flow guide is positioned at a location spaced apart from the inlet and outlet portions along the longitudinal direction of the housing. Claim 14 In paragraph 13, the refrigerant flow guide is positioned to protrude in a direction intersecting the longitudinal direction of the housing, in a dishwasher. Claim 15 A dishwasher having a condenser, wherein the condenser comprises: a housing that forms an outer shape and is configured to allow washing water and a refrigerant to flow separately inside; and a second tube configured inside the housing through which washing water flows, wherein the second tube is arranged such that its longitudinal direction is parallel to the longitudinal direction of the housing and the outer diameter of the second tube decreases as it moves along the direction of the flow of washing water. Claim 16 In claim 15, the condenser is configured such that the outer diameter of the second tube decreases as it moves from an inlet area where the washing water flows in to an outlet area where the washing water is discharged. Claim 17 A dishwasher according to claim 15, wherein the second tubes are provided in a plurality that are separated from each other and arranged inside the housing, and the inner diameter of the second tubes decreases as they approach the center of the housing.