dishwasher

Abstract

To provide a dishwasher that can suppress the deterioration of drainage performance. [Solution] The dishwasher 1 comprises a housing 12 with a washing tank 14 inside, a water supply path for supplying water to the washing tank 14, and a drainage path for draining water from the washing tank 14. A rigid drain trap 57 is provided on the outside of the housing 12, located on the drainage path. A check valve 62 is provided upstream of the drain trap 57 in the drainage path, and the lower end of the drain trap 57 is positioned above the check valve 62.

Description

Technical Field

[0001] This disclosure relates to a dishwasher.

Background Art

[0002] Patent Document 1 discloses a dishwasher that simplifies the configuration of a water supply hose and the lower part of a washing tank, increases the depth size of the washing tank, and enlarges the volume. The dishwasher of Patent Document 1 includes a housing having a front opening at the front, a washing tank provided in the housing for accommodating the objects to be washed, a water supply section including a flexible water supply hose for supplying washing water into the washing tank, an air break device included in the water supply section for preventing the backflow of the washing water, and a control section for executing a washing operation including a washing step and a rinsing step. The washing tank is provided with an open upper surface and is pullable out of the housing, and the air break device is installed outside the rear surface of the washing tank.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention provides a dishwasher capable of suppressing a decrease in drainage performance.

Means for Solving the Problems

[0005] The dishwasher in this disclosure includes a housing having a washing tank inside, a water supply path for supplying water to the washing tank, and a drainage path for draining water from the washing tank. Outside the housing, a drainage trap formed of a rigid body located on the drainage path is provided. In the drainage path, a check valve is provided on the upstream side of the drainage trap, and the lower end of the drainage trap is arranged above the check valve.

Effects of the Invention

[0006] According to this disclosure, the deterioration of drainage performance can be suppressed. [Brief explanation of the drawing]

[0007] [Figure 1] Perspective view of a dishwasher according to Embodiment 1 of this disclosure [Figure 2] Block diagram of a dishwasher [Figure 3] Side view of a dishwasher [Figure 4] Side view of a dishwasher according to Embodiment 2 [Figure 5] Side view of a dishwasher according to Embodiment 3 [Figure 6] Side view of a dishwasher according to Embodiment 4 [Figure 7] Perspective view of a dishwasher according to Embodiment 5 [Figure 8] Side view of a dishwasher [Modes for carrying out the invention]

[0008] (Knowledge and other information that formed the basis of this disclosure) At the time the inventors conceived of this disclosure, there was a dishwasher that comprised a housing with a washing tank inside, a water supply path for supplying water to the washing tank, and a drainage path for draining water from the washing tank. Some dishwashers are equipped with a drain trap in the drainage path that stores a predetermined amount of wastewater, and a check valve upstream of the drain trap that prevents backflow of wastewater. Some of these check valves use the water pressure of the wastewater located downstream of the check valve to seal the drainage path and suppress backflow of wastewater.

[0009] However, the inventors discovered a problem with such dishwashers: if the drain trap is positioned low in the drainage path, the water pressure on the check valve becomes low, which can lead to insufficient suppression of backflow and a decrease in drainage performance. The subject matter of this disclosure was developed to solve this problem. Therefore, this disclosure provides a dishwasher that can suppress the deterioration of drainage performance.

[0010] The embodiments will be described in detail below with reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding for those skilled in the art. The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment 1) Embodiment 1 will be described below with reference to Figures 1 to 3. [1-1. Structure] [1-1-1. Dishwasher Configuration] Embodiment 1 will be described below with reference to Figures 1 to 8. In each figure, the symbol FR indicates the front of the dishwasher 1 when it is installed on the mounting surface and in normal use, the symbol UP indicates the top of the dishwasher 1, and the symbol LH indicates the left side of the dishwasher 1. In the following description, each direction is along these directions of the dishwasher 1. In the installed state of the dishwasher 1, the up-down direction coincides with the vertical direction, and the front-back direction and left-right direction coincide with the horizontal direction.

[0012] [1-1. Structure] [1-1-1. Dishwasher Configuration] Figure 1 is a perspective view showing the dishwasher 1 in Embodiment 1. Figure 1 shows the dishwasher 1 with the door 16 open. As shown in Figure 1, dishwasher 1 is a built-in type dishwasher that is incorporated into a system kitchen.

[0013] The dishwasher 1 includes a main body 10. At the upper part of the main body 10, a housing 12 is provided. The housing 12 is formed in a box shape with an open front. On the front of the housing 12, a front opening 11 that communicates the inside and outside of the housing 12 is provided. A door 16 that covers the front opening 11 is attached to the front of the housing 12 so as to be openable and closable.

[0014] As shown in FIG. 1, inside the housing 12, a washing tub 14 capable of accommodating the object to be washed D is provided. Inside the washing tub 14, a basket 18 for containing the object to be washed D is arranged. Inside the washing tub 14, a washing nozzle 13 for blowing washing water into the washing tub 14 is provided.

[0015] On the side surface of the housing 12, a communication opening 15 which is an opening for communicating the inside and outside of the housing 12 is provided. In the dishwasher 1, washing water is supplied to the washing tub 14 from the outside of the housing 12 through the communication opening 15.

[0016] The main body 10 includes a base frame 20. The base frame 20 is formed in a box shape with an open top surface. The housing 12 is placed on the upper part of the base frame 20.

[0017] FIG. 2 is a block diagram of the dishwasher 1. As shown in FIG. 2, the dishwasher 1 includes a control device 30 that controls each part of the dishwasher 1. The control device 30 includes a processor 100 and a memory 110, and functions as a control unit that controls each part of the dishwasher 1.

[0018] The processor 100 is a processor such as a CPU (Central Processing Unit) or an MPC (Micro Processing Unit). The processor 100 functions as an operation control unit 101 by reading and executing a control program 111 stored in the memory 110.

[0019] Memory 110 functions as a storage unit for storing programs and data. Memory 110 stores the control program 111 and data to be processed by the processor 100. Memory 110 has a non-volatile storage area. Alternatively, memory 110 may also have a volatile storage area and constitute the work area of ​​the processor 100.

[0020] The dishwasher 1 includes a circulation pump 31, a drain pump 32, a water supply pump 33, a wash water heater 34, a blower fan 36, a drying heater 38, a cooling fan 37, and a temperature sensor 39. The control device 30 is connected to the circulation pump 31, the drain pump 32, the water supply pump 33, the wash water heater 34, the blower fan 36, the drying heater 38, the cooling fan 37, and the temperature sensor 39. The control device 30 has an interface to which these devices and circuits are connected. Note that the devices and circuits connected to the control device 30 are not limited to these, and other devices and circuits may also be connected.

[0021] The circulation pump 31 is a pumping device that operates according to the control of the control device 30, circulating the cleaning water supplied to the cleaning tank 14 through the circulation path and spraying the cleaning water from the cleaning nozzle 13.

[0022] The drain pump 32 is a pumping device that is driven according to the control of the control device 30 and drains the cleaning water from inside the cleaning tank 14.

[0023] The water supply pump 33 is a pumping device that operates according to the control of the control device 30 and sprays washing water from the washing nozzles 13. The dishwasher 1 is equipped with a water storage tank that stores washing water supplied from outside the main body 10. The water supply pump 33 sprays the washing water supplied from this water storage tank from the washing nozzles 13.

[0024] The cleaning water heater 34 generates heat according to the control of the control device 30, and heats the cleaning water sprayed from the cleaning nozzle 13.

[0025] The blower fan 36 is a blower that rotates according to the control of the control device 30. The blower fan 36 sends outside air into the washing tank 14 as drying air, drying the objects to be washed D set in the basket 18.

[0026] The drying heater 38 generates heat according to the control of the control device 30, and heats the air blown out by the blower fan 36.

[0027] The cooling fan 37 is a blower that rotates according to the control of the control device 30. The cooling fan 37 is driven at a higher rotational speed than the blower fan 36 and blows out air to cool the gas discharged from the cleaning tank 14.

[0028] The temperature sensor 39 is driven according to the control of the control device 30 and measures the temperature outside the main unit 10, i.e., the space in which the dishwasher 1 is installed. The temperature sensor 39 transmits the measured temperature as data to the control device 30.

[0029] The operation control unit 101 controls the operation of the dishwasher 1. In this embodiment, the operation of the dishwasher 1 is an operation related to washing the items to be washed D stored inside the washing tank 14. This operation may be an operation in which the washing process, rinsing process, and drying process are performed in that order in succession, or an operation in which only one of the processes is performed, or an operation in which two or more of the processes are performed in any order.

[0030] [1-1-2. Air Break Device Configuration] Figure 3 is a side view of the dishwasher 1, viewed from the left. In Figure 3, the left side of the air break device 40 is omitted, and the internal structure of the air break device 40 is shown. As shown in Figures 1 and 3, an air break device 40 is provided on the outer surface of the main body 10 of the dishwasher 1. In this embodiment, the air break device 40 is mounted along the left side of the main body 10. The air break device 40 is made of a resin material or the like, and is formed into a flat shape with a predetermined rigidity and an internal space.

[0031] The air break device 40 is provided with multiple ribs 42 inside, and these ribs 42 partition the internal space, creating a water supply path 41 and a drainage path 51. Both the water supply path 41 and the drainage path 51 are passages through which washing water flows. In the air break device 40 of this disclosure, the drainage path 51 is positioned at least partially behind the water supply path 41. The air break device 40 corresponds to the "water supply and drainage unit" in this disclosure.

[0032] A connecting opening 43 is provided at the lower end of the air break device 40, which is an opening that connects the inside and outside of the air break device 40. The connecting opening 43 is located at one end of the water supply path 41, and a water supply hose extending from the water supply tank is connected to it. In the dishwasher 1, for example, when the water supply pump 33 is driven, washing water is supplied to the water supply path 41 via the water supply hose. In the air break device 40 of this disclosure, the water supply path 41 is formed to extend upward from the connection opening 43.

[0033] A water supply opening 45, which is an opening that connects the inside and outside of the air break device 40, is provided along the water supply path 41. The water supply opening 45 is connected to the communication opening 15, and the cleaning water flowing through the water supply path 41 is supplied to the cleaning tank 14 via the water supply opening 45 and the communication opening 15.

[0034] A connecting opening 53 is provided at the lower end of the air break device 40, which is an opening that connects the inside and outside of the air break device 40. The connecting opening 53 is located at one end of the drainage path 51, and one end of the internal drainage hose 60 is connected to it.

[0035] The other end of the internal drain hose 60 is connected to the cleaning tank 14. A drain pump 32 is installed in the middle of the internal drain hose 60. When the drain pump 32 is driven, the cleaning water from the cleaning tank 14 is supplied as wastewater to the drainage path 51 of the air break device 40 via the internal drain hose 60.

[0036] A check valve 62 is provided in the middle of the internal drain hose 60. The check valve 62 is an opening and closing device that allows cleaning water to flow from the cleaning tank 14 towards the air break device 40 and prevents cleaning water from flowing from the air break device 40 towards the cleaning tank 14 in the internal drain hose 60.

[0037] In the internal drain hose 60 of this embodiment, the check valve 62 is positioned downstream of the drain pump 32. As a result, in the dishwasher 1, even when the drain pump 32 stops running, the wash water remains downstream of the check valve 62. Therefore, even when the drain pump 32 stops running in the dishwasher 1, when the drain pump 32 starts running again, idling is suppressed, and it is possible to send the wash water from the washing tank 14 towards the air break device 40 with higher efficiency. The check valve 62 may be located upstream of the drain pump 32 in the internal drain hose 60.

[0038] The internal drain hose 60 is routed such that one end connected to the connection opening 53 is located at the top in the longitudinal direction. This ensures that the drain pump 32 and the check valve 62 are positioned below the air break device 40.

[0039] A riser path 55 is formed in the drainage path 51, extending upward from the connection opening 53. The upper end 55A of the riser path 55 extends upward for a predetermined flow path length, then curves backward, and further extends downward, forming an upwardly convex U shape. In the air break device 40 of this embodiment, the upper end 55A of the riser path 55 is located above the water supply path 41.

[0040] In the drainage path 51, a drain trap 57, which is a flow path continuous with the riser path 55, is connected to the upper end 55A of the riser path 55. As a result, the drain trap 57 and the riser path 55 are integrally provided in the air break device 40. The drain trap 57 extends downward for a predetermined flow path length, forming a downwardly convex U-shape, then curves backward and extends further upward. As a result, the drain trap 57 has a predetermined depth dimension extending along the vertical direction. The drain trap 57 stores a portion of the washing water discharged from the washing tank 14 when washing water does not flow through the drainage path 51. This prevents odors from the drain pipe 72 connected to the dishwasher 1, as well as sanitary pests, from entering the dishwasher 1.

[0041] At least a portion of the drain trap 57 is located above the water supply path 41. In this embodiment, the lower end 57A of the drain trap 57 is positioned to overlap with the upper end 41A of the water supply path 41 in the vertical direction. In this embodiment, the lower end 57A of the drain trap 57 is positioned above the upper end 45A of the water supply opening 45 on the path of the water supply path 41.

[0042] In the drain trap 57, the end opposite to the connection point with the riser path 55 is provided with a drain section 59 that slopes downward as it approaches the rear. In the drain section 59, the end opposite to the connection point with the drain trap 57 is provided with a drain port 71 that opens downward and connects the inside and outside of the air break device 40.

[0043] An external drain hose 70 is connected to the drain port 71. The external drain hose 70 connects the dishwasher 1 to a drain pipe 72 located at the installation site of the dishwasher 1. The external drain hose 70 is attached to the drain port 71 by a drain hose holder 74.

[0044] The drain trap 57, the drain section 59, and the drain outlet 71 are positioned above the upper end 72A of the drain pipe 72.

[0045] An atmospheric release hole 81, which is a through-hole that connects the inside and outside of the air break device 40, is provided at the upper end of the air break device 40. In the air break device 40 of this embodiment, the atmospheric release hole 81 is provided above both the water supply path 41 and the drainage path 51.

[0046] The air break device 40 is provided with an open channel 83. The open channel 83 is formed by partitioning the internal space of the air break device 40 with ribs 42 provided inside the air break device 40. The open channel 83 includes a water supply side open channel 85 and a drainage side open channel 87.

[0047] The water supply side open channel 85 has one end connected to the atmospheric vent hole 81 and the other end connected to the upper end 41A of the water supply path 41. This allows the dishwasher 1 to exhaust the washing tank 14 through the water supply opening 45, the communication opening 15, the water supply side open channel 85, and the atmospheric vent hole 81.

[0048] The drainage-side open channel 87 has one end connected to the atmospheric vent 81 and the other end connected to the upper end 55A of the riser path 55 of the water supply path 41.

[0049] Thus, in the dishwasher 1, the air break device 40 is provided with an atmospheric release hole 81 and an open channel 83, so that even if negative pressure occurs inside either the water supply path 41 or the drainage path 51, backflow of the washing water flowing through these channels is suppressed.

[0050] In the air break device 40, the atmospheric release hole 81 and the open channel 83 are positioned above the water supply path 41 and the drainage path 51, respectively, thereby preventing the cleaning water from leaking out of the air break device 40 through the atmospheric release hole 81.

[0051] As described above, in the dishwasher 1, the water supply path 41, the connection opening 53, the riser path 55, the drain trap 57, the drain section 59, and the open channel 83 of the drainage path 51 are integrally formed by a rigid air break device 40. As a result, in the dishwasher 1, it is possible to provide the water supply path 41, the drainage path 51, and the open channel 83 without deforming the shape of each channel, and even when fluid flows through these channels, deformation of each channel is suppressed. Therefore, in the dishwasher 1, it is easy to provide the water supply path 41, the drainage path 51, and the open channel 83, and to maintain their functions, while suppressing an increase in the number of parts.

[0052] Furthermore, the statement that the water supply path 41, the connection opening 53, the riser path 55, the drain trap 57, the drain section 59, and the open channel 83 of the drainage path 51 are integrally formed means that these paths are formed from a single component, and the intermediate parts of these paths are formed from other components, i.e., they are not formed as separate parts. As described above, these paths are integrally formed by the air break device 40, which is a rigid body made of resin material.

[0053] [1-2. Operation] The operation of the dishwasher 1, configured as described above, will be explained below. As shown in Figure 2, the dishwasher 1 operates in accordance with the control of the control device 30, performing washing, rinsing, and drying processes.

[0054] In the washing and rinsing processes, the control device 30 drives the washing water heater 34 to heat the washing water. The control device 30 drives the water supply pump 33 to spray the washing water supplied from the water storage tank through the washing nozzles to wash the object to be washed D. The control device 30 drives the drain pump 32 to circulate the washing water supplied to the washing tank 14 through the circulation path, spraying the washing water from the washing nozzles to wash and rinse the object to be washed D. The control device 30 drives the drain pump 32 to drain the washing water from the washing tank 14.

[0055] The cleaning water drained from the cleaning tank 14 flows through the internal drain hose 60, passes through the check valve 62 and the drain pump 32, and then flows into the air break device 40. The wastewater that flows into the air break device 40 flows through the drain path 51 and then flows into the drain pipe 72 via the external drain hose 70, thereby being discharged from the air break device 40.

[0056] As described above, the drain trap 57, the drain section 59, and the drain outlet 71 are positioned above the upper end 72A of the drain pipe 72, and at least a portion of the drain trap 57 is located above the water supply path 41. As a result, in the dishwasher 1, the slope prevents wastewater from flowing back from the drain pipe 72 towards the air break device 40.

[0057] Furthermore, because at least a portion of the drain trap 57 is located above the water supply path 41, more washing water remains in the flow path from the drain trap 57 to the check valve 62. In other words, in the dishwasher 1, the water head position in the flow path from the drain trap 57 to the check valve 62 is formed to be higher. As a result, higher water pressure is applied to the check valve 62. Therefore, in the dishwasher 1, the backflow of washing water discharged from the washing tank 14 back into the washing tank 14 can be more reliably suppressed.

[0058] [1-3. Effects, etc.] As described above, in this embodiment, the dishwasher 1 comprises a housing 12 having a washing tank 14 inside, a water supply path 41 for supplying water to the washing tank 14, and a drainage path 51 for draining water from the washing tank 14. A rigid drain trap 57 is provided on the outside of the housing 12, located on the drainage path 51. A check valve 62 is provided in the drainage path 51 upstream of the drain trap 57, and the lower end portion 57A of the drain trap 57 is positioned above the check valve 62. As a result, high water pressure is applied to the check valve 62. Therefore, in the dishwasher 1, it is possible to suppress the backflow of washing water discharged from the washing tank 14 back into the washing tank 14.

[0059] As in this embodiment, at least a portion of the drain trap 57 may be positioned above the water supply path 41. As a result, higher water pressure is applied to the check valve 62. Therefore, in the dishwasher 1, the backflow of washing water discharged from the washing tank 14 back towards the washing tank 14 can be more reliably suppressed.

[0060] As in this embodiment, the system includes an air break device 40 that forms at least a portion of the water supply path 41 and the drainage path 51. The air break device 40 is provided on the outside of the housing 12, and the drainage trap 57 may be provided on the same plane as the surface of the housing 12 on which the air break device 40 is provided. This allows the dishwasher 1 to easily form a drainage path 51. Therefore, the dishwasher 1 can easily control the drainage.

[0061] As in this embodiment, the drain trap 57 may be provided integrally with the air break device 40. This allows the dishwasher 1 to minimize the increase in the number of parts. Therefore, the dishwasher 1 can easily form a drainage path 51.

[0062] (Embodiment 2) Embodiment 2 will be described below with reference to Figure 4. [2-1. Structure] Figure 4 is a side view of the dishwasher 1, viewed from the left. In Figure 4, the left side of the air break device 140 is omitted, and the internal structure of the air break device 40 is shown. In Figure 4, the same reference numerals are used for the same parts as in Figure 3, and their explanations are omitted. As shown in Figure 4, the dishwasher 1 of this embodiment is equipped with an air break device 140 instead of an air break device 40. The air break device 140 corresponds to the "water supply and drainage unit" of this disclosure.

[0063] The air break device 140 is provided with a riser path 155 that has a longer flow path length and whose upper end portion 155A is positioned higher than the riser path 55 provided in the air break device 40. A drain trap 57 is connected to the downstream side of the riser path 155. The drain trap 57 is positioned above the water supply path 41 as a whole. In this embodiment, in particular, the lower end 57A of the drain trap 57 is positioned above the upper end 41A of the water supply path 41.

[0064] As described above, in the dishwasher 1, the water supply path 41, the connection opening 53, the riser path 155, the drain trap 57, the drain section 59, and the open flow path 83 of the drainage path 51 are integrally formed by a rigid air break device 140. Due to the above structure, in the dishwasher 1, more washing water remains in the flow path from the drain trap 57 to the check valve 62, resulting in a higher water head position in the flow path from the drain trap 57 to the check valve 62. As a result, higher water pressure is applied to the check valve 62. Therefore, in the dishwasher 1, the backflow of washing water discharged from the washing tank 14 back into the washing tank 14 can be more reliably suppressed.

[0065] (Embodiment 3) Embodiment 3 will be described below with reference to Figure 5. [3-1. Structure] Figure 5 is a side view of the dishwasher 1, viewed from the left. In Figure 5, the side view to the left of the air break device 240 and the drain unit 90 is omitted, and the internal structure of the air break device 240 and the drain unit 90 is shown. In Figure 5, the same reference numerals are used for the same parts as in Figure 3, and their explanations are omitted. As shown in Figure 5, the dishwasher 1 of this embodiment is equipped with an air break device 240 instead of an air break device 40. Similar to the air break device 40, the air break device 240 is made of a resin material or the like, providing a predetermined rigidity and being formed in a flat shape with an internal space.

[0066] The air break device 240 is provided with a water supply path 41, an open flow path 83, and a riser path 255 within the drainage path 51. In Embodiment 3, the riser path 255 has a longer flow path length than the riser path 155, and its upper end portion 255A is positioned at a higher location.

[0067] The dishwasher 1 is equipped with a drain unit 90. The drain unit 90 is mounted on the outer surface of the main body 10 of the dishwasher 1, along the same surface as the air break device 240, that is, along the left side of the main body 10. The drain unit 90 is made of a resin material or the like, and is formed into a flat shape with a predetermined rigidity and an internal space.

[0068] The drain unit 90 is provided with multiple ribs 142 inside, and these ribs 142 partition the internal space, thereby providing a drain trap 57 and a drain section 59. The drain section 59 of the drain unit 90 is provided with a drain port 71 at the end opposite to the connection point with the drain trap 57, and an external drain hose 70 is connected to the drain port 71. The external drain hose 70 is attached to the drain port 71 by a drain hose holder 74.

[0069] The drainage unit 90 is provided with a mounting portion 92. The mounting portion 92 is provided with, for example, a screw hole. The drainage unit 90 is fixed to the main body 10 by fastening members 94, such as screws, which are inserted through the screw hole. In this embodiment, the drain unit 90 is mounted on the housing 12 such that at least a portion of the drain trap 57 is positioned above the upper end 41A of the water supply path 41. In this embodiment, the drain unit 90 is mounted on the housing 12 such that the entire drain trap 57 is positioned above the water supply path 41 and the drain pipe 72. In this embodiment, the lower end 57A of the drain trap 57 is positioned above the upper end 41A of the water supply path 41 and the upper end 72AE of the drain pipe 72.

[0070] The air break device 240 and the downstream portion of the drain unit 90 from the drain trap 57 onwards are connected to each other, for example, by a connecting hose 96. One end of the connecting hose 96 is connected to the downstream end of the riser path 255, and the other end of the connecting hose 96 is connected to the upstream end of the drain trap 57. In this case, at least a portion of the connecting hose 96 is located above the upper end 57B of the drain trap 57, and the upper end 255A of the riser path 255 is located above the connecting hose 96.

[0071] Thus, in the drainage path 51, the drain trap 57 and the riser path 255 housed in the air break device 240 are connected by a connecting hose 96 which is a different component, and the drain trap 57 is provided separately from the air break device 240 which includes the riser path 255. In this context, "separate component" refers to a series of paths formed by two or more components, where a different component is connected to the path midway through.

[0072] Furthermore, the air break device 240 and the drainage unit 90 may be connected to each other not only by hoses, but also by various types of connectors such as pipe fittings. Alternatively, for example, the air break device 240 and the drainage unit 90 may be directly connected without using a connector by forming a screw or socket shape at the downstream end of the riser path 255 and the upstream end of the drainage trap 57, respectively. The air break device 240, the drainage unit 90, and the connecting hose 96 correspond to the "water supply and drainage unit" in this disclosure.

[0073] Thus, in the dishwasher 1 of this embodiment, the drain trap 57 is provided on a separate component from the component that provides the water supply path 41 and the riser path 255. This allows the dishwasher 1 to have the drain trap 57 in an appropriate position depending on the installation location and the position of the drain pipe 72, and also allows the available space on the side of the main body 10 to be used effectively.

[0074] (Embodiment 4) Embodiment 4 will be described below with reference to Figure 6. [4-1. Structure] Figure 6 is a side view of the dishwasher 1, viewed from the left. In Figure 5, the side view to the left of the air break device 240 and the drain unit 90 is omitted, and the internal structure of the air break device 240 and the drain unit 90 is shown. In Figure 5, the same reference numerals are used for the same parts as in Figures 3 and 5, and their explanations are omitted. As shown in Figure 6, the dishwasher 1 of this embodiment is equipped with a blower mechanism 400 on the same side as the air break device 240, that is, on the left side of the main body 10.

[0075] The blower mechanism 400 is formed in a duct shape with a predetermined rigidity and an internal space, using resin material or the like. The blower mechanism 400 is provided with a communication hole 401 that connects the inside and outside of the blower mechanism 400. A blower fan 36 is housed inside the blower mechanism 400. However, the blower mechanism 400 may house various types of blowers, not just the blower fan 36. The blower mechanism 400 corresponds to the "blower mechanism" in this disclosure.

[0076] The drain unit 90 is provided with a mounting portion 98 instead of a mounting portion 92. The mounting portion 98 is provided with, for example, a screw hole. The drain unit 90 is fixed to the blower mechanism 400 by fastening members 94, such as screws, which are inserted through the screw hole.

[0077] As a result, the drainage unit 90 is positioned below the blower mechanism 400 and above the air break device 240. In other words, the drainage unit 90 is positioned vertically between the blower mechanism 400 and the water supply path 41 of the air break device 240. In this embodiment, the drain unit 90 and the upper end 255A of the riser path 255 are located below the lower end 400A of the blower mechanism 400. Also, the lower end 57A of the drain trap 57 is located at approximately the same height as the upper end 41A of the water supply path 41. Therefore, in the dishwasher 1, the empty space on the side of the main unit 10 can be effectively utilized.

[0078] Thus, in the dishwasher 1 of this embodiment, the drain trap 57 is provided on a separate component from the component that provides the water supply path 41 and the riser path 255, and is fixed to the blower mechanism 400. This allows the dishwasher 1 to have the drain trap 57 in an appropriate position depending on the installation location and the position of the drain pipe 72, and allows the drain trap 57 to be attached without providing a fixing structure on the side of the main body 10.

[0079] In this embodiment, the lower end portion 57A of the drain trap 57 is positioned at approximately the same height as the upper end portion 41A of the water supply path 41. However, the lower end portion 57A of the drain trap 57 may be positioned between the upper end portion 41A of the water supply path 41 and the upper end portion 45A of the water supply opening 45. For example, the lower end 57A of the drain trap 57 may be positioned below the upper end 45A of the water supply opening 45. For example, the lower end portion 57A of the drain trap 57 may be located between the upper end portion 41A of the water supply path 41 and the lower end portion 400A of the blower mechanism 400.

[0080] (Embodiment 5) Embodiment 5 will be described below with reference to Figures 7 and 8. [5-1. Structure] Figure 7 is a perspective view of the dishwasher 1 from the rear. For the sake of clarity, the connecting hose 96 is shown as a dashed line in Figure 7. In Figure 7, the same reference numerals are used for the same parts as in Figures 1, 3, and 5, and their explanations are omitted. As shown in Figure 7, in the dishwasher 1 of this embodiment, the drain unit 90 is provided on the rear surface of the main body 10. The drain unit 90 of this embodiment is fixed to a fastener 500 provided on the housing 12 by fastening members 94 such as screws inserted through screw holes provided in the mounting portion 92, and is thereby attached to the main body 10.

[0081] Figure 8 is a side view of the dishwasher 1, viewed from the left. In Figure 8, the side view located behind the air break device 240 and the drain unit 90 is omitted, and the internal structure of the air break device 240 and the drain unit 90 is shown. In Figure 8, the same reference numerals are used for the same parts as in Figures 3 and 5, and their explanations are omitted.

[0082] As shown in Figures 7 and 8, the air break device 240 and the downstream portion of the drain unit 90 from the drain trap 57 onwards are connected to each other by a connecting hose 96. The connecting hose 96 is routed from the left side to the rear of the main body 10. That is, in the drainage path 51, the drain trap 57 is provided separately from the air break device 240, which includes the riser path 255.

[0083] As shown in Figures 7 and 8, the drain unit 90 is mounted on the housing 12 such that at least a portion of the drain trap 57 is positioned above the water supply path 41. In this embodiment, the drain unit 90 is mounted on the housing 12 such that the entire drain trap 57 is positioned above the water supply path 41 and the drain pipe 72.

[0084] As shown in Figure 8, the drain unit 90 is positioned approximately in the center of the rear surface of the main body 10 in the left-right direction. This prevents the length of the external drain hose 70 from becoming excessive, even if, for example, the drain pipe 72 is positioned on the right side of the main body 10. In other words, in the dishwasher 1 of this embodiment, the length of the drainage flow path can be prevented from becoming excessive regardless of the position of the drain pipe 72, and the drainage flow path can be easily controlled.

[0085] Furthermore, as shown in Figure 7, it is desirable that the connection point of the connecting hose 96 to the riser path 255 be positioned above the connection point to the drain trap 57. This helps to prevent obstruction of the drainage flow in the drain path 51. For example, in the connecting hose 96, the connection point with the drain trap 57 and the connection point with the riser path 255 may be located at approximately the same position in the vertical direction. This makes it possible to prevent the connecting hose 96 from bending in the dishwasher 1 and to prevent the formation of a structure like the drain trap 57 in the connecting hose 96.

[0086] (Other embodiments) As described above, Embodiments 1 to 5 have been explained as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to create new embodiments by combining the components described in Embodiments 1 to 5 above.

[0087] The embodiments described above are for illustrative purposes only and may be modified, replaced, added, or omitted within the scope of the claims or equivalents thereof.

[0088] (Note) Based on the above description of embodiments, the following technologies are disclosed.

[0089] (Technical 1) A dishwasher comprising a housing with a washing tank inside, a water supply path for supplying water to the washing tank, and a drainage path for draining water from the washing tank, wherein a drain trap made of a rigid body is provided on the outside of the housing and located on the drainage path, a check valve is provided in the drainage path upstream of the drain trap, and the lower end of the drain trap is positioned above the check valve. This results in high water pressure being applied to the check valve. Therefore, in dishwashers, this prevents the wash water discharged from the washing tank from flowing back into the washing tank.

[0090] (Technical 2) The dishwasher according to Technical 1, wherein at least a portion of the drain trap is positioned above the water supply path. This results in higher water pressure being applied to the check valve. Therefore, in dishwashers, it is possible to more reliably prevent the wash water discharged from the washing tub from flowing back into the washing tub.

[0091] (Technical 3) A dishwasher according to Technical 1 or Technical 2, comprising a water supply and drainage unit in which at least a portion of the water supply path and the drainage path are formed, wherein the water supply and drainage unit is provided on the outside of the housing, and the drainage trap is provided on the same surface as the surface of the housing in which the water supply path is provided. This allows for easy creation of drainage paths in dishwashers. Therefore, drainage can be easily controlled in dishwashers.

[0092] (Technical 4) The dishwasher according to Technical 3, wherein the drain trap is integrally provided with the water supply and drainage unit. This allows for a reduction in the number of parts in a dishwasher. As a result, the drainage path can be easily formed in a dishwasher.

[0093] (Technical 5) The dishwasher according to Technical 4, wherein the lower end of the drain trap is positioned above the water supply path. This results in high water pressure being applied to the check valve. Therefore, in dishwashers, this prevents the wash water discharged from the washing tank from flowing back into the washing tank.

[0094] (Technical 6) The dishwasher according to any one of Technical 1 to Technical 5, wherein a blower mechanism is provided on the surface of the housing on which the water supply path and the drainage path are provided, and the drain trap is attached to the blower mechanism. This allows dishwashers to have a drain trap installed in an appropriate location depending on the installation site and the position of the drain pipe, and the drain trap can be attached without the need for a fixing structure on the side of the main unit.

[0095] (Technical 7) The dishwasher according to Technical 6, wherein the blowing mechanism is located above the water supply path and the drainage path, and the drainage trap is located between the blowing mechanism and the water supply path. This allows the dishwasher to effectively utilize the empty space on the sides of the unit.

[0096] (Technical 8) The dishwasher according to any one of Technical 1 to Technical 7, wherein the drain trap is provided on a surface of the housing different from the surface on which the water supply path is provided. This allows the overall length of the drainage path in a dishwasher to be kept from becoming excessive, even if, for example, the drain pipe is located on the right side of the main unit. Therefore, the drainage path in a dishwasher can be easily controlled. [Industrial applicability]

[0097] This disclosure is applicable to dishwashers in which a spray nozzle for spraying wash water is supported by a support section through which a flow path for wash water is provided. Specifically, this disclosure is applicable to commercial dishwashers. [Explanation of Symbols]

[0098] 1 Dishwasher 10 Main Unit 11 Front opening 12 cabinets 13 Cleaning nozzles 14 Washing Tank 15 Communication opening 16 Doors 18 baskets 20-unit frame 30 Control device 31 Circulation pump 32 Drainage pump 33 Water supply pump 34. Washing water heater 36. Blower fan 37 Cooling fan 38 Drying heater 39 Temperature sensor 40 Air Break Device 41 Water supply routes 42 Ribs 43 Connection opening 45 Water supply opening 51 Drainage Route 53 Connection opening 55 Startup Route 57 Drain trap 59 Drainage section 60 Internal drain hose 62 Check valve 70 External drain hose 71 Drain 72 Drain pipe 74 Drain hose holder 81 Atmospheric vent 83 Open channel 85 Open channel on the water supply side 87 Drainage side open channel 90 Drainage Unit 92 Mounting part 94 Fastening members 96 Connection hose 98 Mounting part 100 processors 101 Operation Control Unit 110 memory 111 Control Program 140 Air Break Device 142 Ribs 155 Startup Route 240 Air Break Device 255 Startup Route 400 Blower mechanism 401 Communication hole 500 Fixtures D. Items to be washed

Claims

1. A housing equipped with a cleaning tank inside, A water supply path for supplying water to the washing tank and a drainage path for draining water from the washing tank, Equipped with, A drain trap, formed of a rigid body and located on the drainage path, is provided on the outside of the housing. A check valve is provided upstream of the drain trap in the drainage path. The lower end of the drain trap is positioned above the check valve. dishwasher.

2. At least a portion of the drain trap is positioned above the water supply path. The dishwasher according to claim 1.

3. The water supply and drainage unit comprises at least a portion of the water supply route and the drainage route, The water supply and drainage unit is provided on the outside of the housing, The drain trap is provided on the same surface as the surface of the housing on which the water supply path is provided. A dishwasher according to claim 1 or claim 2.

4. The drain trap is provided integrally with the water supply and drainage unit. The dishwasher according to claim 3.

5. The lower end of the drain trap is positioned above the water supply path. The dishwasher according to claim 4.

6. The housing is provided with a blowing mechanism on the surface on which the water supply path and the drainage path are provided. The drain trap is attached to the blower mechanism. A dishwasher according to claim 1 or claim 2.

7. The blowing mechanism is positioned above the water supply path and the drainage path. The drain trap is positioned between the blowing mechanism and the water supply path. The dishwasher according to claim 6.

8. The drain trap is provided on a side of the housing that is different from the side on which the water supply path is provided. A dishwasher according to claim 1 or claim 2.

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