Booster for dishwasher

Abstract

To efficiently perform assembly work from temporary assembly of a vertical frame and an upper frame of a housing to screw fastening.SOLUTION: Each vertical frame 45 comprises: inside flat surface parts 57, 57 that are strip-shaped plates having a front-to-rear width extending along an upright part 49A and erected vertically, and are screwed to an outer surface of the upright part 49A at both front and rear ends; an outside flat surface part 56 that protrudes outward to the left and right between the inside flat surface parts 57, 57, and to which a side panel 15 is screwed; a pair of connecting surface parts 58, 58; and an upper notch 67 that is cut downward from an upper end between each inside flat surface part 57 and each connecting surface part 58. Each horizontal upper frame 48 has a horizontal plate part 81 that extends longitudinally along an outer surface of each inside flat surface part 57 of two aligned vertical frames 45, 45 and is screwed to the inside flat surface part 57. The horizontal plate parts 81 is each provided with a cutout part 84 that engages with each upper notch 67 from above at an attachment position to the vertical frame 45.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a dishwasher booster that is installed to supply high temperature water to a commercial dishwasher. [Background technology]

[0002] A known commercial dishwashing system includes a dishwasher that washes dishes brought into a washing room and a dishwasher booster that is installed alongside the dishwasher and supplies hot water for rinsing to the dishwasher. As disclosed in Patent Document 1, for example, the dishwasher booster includes an instantaneous heating heat source unit that includes a burner and a heat exchanger and heats supplied water using the combustion exhaust from the burner within a housing, and a tank that stores the hot water heated by the heat source unit. The housing has a rectangular bottom plate in plan view to which the heat source unit, the tank, etc. are fixed, and outer panels surround the four sides (front, back, left, and right). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-299662 Summary of the Invention [Problem to be solved by the invention]

[0004] The outer panels on the front, rear, left, and right sides are sometimes secured by erecting four vertical frames at the four corners of the bottom plate, erecting four upper frames between the top ends of each vertical frame, and screwing them to the vertical and upper frames that form each side. In this case, the vertical and upper frames are first temporarily assembled before being screwed together, but the temporarily assembled vertical and upper frames may become misaligned during screwing, requiring redoing, which makes the assembly process more time-consuming.

[0005] Therefore, an object of the present disclosure is to provide a booster for a dishwasher that allows efficient assembly work from temporary assembly of the vertical frame and upper frame of the housing to screw fastening. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides a housing including a bottom plate that is rectangular or square in plan view and has upwardly extending raised portions formed on the left and right side edges, four vertical frames erected at the four corners of the bottom plate, two left and right horizontal upper frames erected between the upper ends of the two vertical frames lined up in a front-to-back relationship, two front upper frames and a rear upper frame erected between the upper ends of the two vertical frames lined up in a front-to-back relationship, and side panels attached to the vertical frames at least on the left and right side surfaces, The system accommodates a heat source unit, a tank for storing water, and an internal circulation path that includes a circulation pump and circulates the water in the tank between the heat source unit and the tank, A dishwasher booster that can operate the circulation pump to circulate water in the tank between the tank and the heat source unit through the internal circulation path, heat the water in the heat source unit, and supply the heated water to an external dishwasher, Each of the vertical frames is a strip-shaped plate that has a front-to-rear width extending along the upright portion and is erected in the vertical direction, and includes an inner flat surface that is screwed to the outer surface of the upright portion at both front and rear ends, an outer flat surface that protrudes outward to the left and right between the inner flat surfaces and to which the side panels are screwed, a pair of connecting surface portions that connect each of the inner flat surface portions and the outer flat surface portions, and an upper frame slit that is cut downward from the upper end between each of the inner flat surface portions and each of the connecting surface portions, Each of the horizontal upper frames has at least a horizontal plate portion that extends in the front-to-rear direction along the outer surface of each of the inner flat portions of the two vertical frames that are lined up in front and behind and is screwed to the inner flat portions, and the horizontal plate portion is characterized in that it each has a cutout portion that engages with each of the upper frame slits from above at the attachment position to the vertical frame. In another aspect of the present disclosure, in the above configuration, each of the horizontal upper frames further has a horizontal upper plate portion bridged between the upper ends of the two vertical frames arranged in front and behind, The front upper frame and / or the rear upper frame have a front upper plate portion and / or a rear upper plate portion whose left and right ends are bridged between the upper ends of the two vertical frames lined up on the left and right, The horizontal upper plate portion overlaps the front upper plate portion and / or the rear upper plate portion from above at the mounting position, and clamps the front upper plate portion and / or the rear upper plate portion between itself and the upper end of the vertical frame. In another aspect of the present disclosure, in the above configuration, each of the vertical frames has a folded portion that is folded inwardly to the left and right from an edge of each of the inner flat portions, and an upward locking protrusion is formed at an upper end of each of the folded portions, The side upper plate portion, the front upper plate portion and / or the rear upper plate portion are characterized in that a locking portion is formed on which the locking projection is locked at the mounting position. [Effects of the Invention]

[0007] According to the present disclosure, the front and rear vertical frames and the horizontal upper frame are firmly pre-assembled by engaging the upper frame slits with the cutouts, so that the assembly work from pre-assembling the vertical frames and upper frame of the housing to fastening with screws can be performed efficiently. According to another aspect of the present disclosure, in addition to the above effects, the horizontal upper plate portion overlaps the front upper plate portion and / or rear upper plate portion from above at the mounting position, and clamps the front upper plate portion and / or rear upper plate portion between the upper end of the vertical frame, thereby increasing the unity between the vertical frame and the upper frame in the pre-assembled state and more effectively preventing misalignment of each frame. According to another aspect of the present disclosure, in addition to the above-mentioned effects, the locking protrusions provided on the folded portions of each vertical frame are locked with the locking portions provided on the front upper plate portion and / or the rear upper plate portion, which further enhances the unity of the vertical frames and the upper frame in the pre-assembled state and more effectively prevents misalignment of each frame. In particular, if the locking protrusions are provided on the front upper plate portion and locked with the locking portions, it is possible to prevent the front upper frame, which has been set first, from tipping forward when assembling the horizontal upper frame, making it easier to pre-assemble the horizontal upper frame. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a booster for a dishwasher. [Figure 2] FIG. 2 is a central vertical cross-sectional view of a booster for a dishwasher. [Figure 3] FIG. 2 is a perspective view showing the state in which the top plate and each panel of the housing are omitted, as viewed from the rear. [Figure 4] FIG. [Figure 5] FIG. 2 is an exploded perspective view of the front lower portion of the frame structure. [Figure 6] FIG. 2 is an exploded perspective view of the front upper portion of the frame structure. [Figure 7] FIG. 2 is a perspective view of the front lower portion of the frame structure. [Figure 8] FIG. 2 is a perspective view of the front upper portion of the frame structure. [Figure 9] 3 is an explanatory diagram showing only the front and rear portions in a cross section taken along line AA in FIG. 2. [Figure 10] 10 is an explanatory diagram showing only the upper part in a cross section taken along line BB in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 is a perspective view showing an example of a booster for a dishwasher (hereinafter simply referred to as "booster") 1, Fig. 2 is a central longitudinal cross-sectional view, and Fig. 3 is a perspective view showing the booster from the rear with the top plate and each panel omitted. Note that in the booster 1 of this embodiment, the front panel 13 on which the operating unit 17 and the air intake unit 18 are provided will be described as the front face (front surface). The booster 1 includes a housing 2, a heat source unit 3, a tank 4, an internal circulation path 5, a gas supply unit 6, a water injection unit 7, and a controller 8. The housing 2 is a rectangular parallelepiped extending in the front-to-rear direction, with a frame structure formed above a bottom plate 10 that is rectangular in plan view. The bottom plate 10 is supported horizontally by legs 11, 11... provided on the underside. A top plate 12 is provided on the top surface of the housing 2, and a front panel 13, a rear panel 14, and left and right side panels 15, 15 are provided on the front, back, left, and right sides to close off each side. An exhaust duct 16 is provided on the top plate 12. An operation unit 17 is provided on the upper side of the front panel 13, and an air intake unit 18 is provided on the lower side. The housing 2 accommodates a heat source unit 3, a tank 4, an internal circulation path 5, a gas supply unit 6, a water injection unit 7, and a controller 8. Details of the housing 2 will be described later.

[0010] The heat source unit 3 includes, in order from the bottom, a combustion section 20, a heat exchange section 21, and an exhaust section 22, and is disposed in the housing 2 toward the front left. The combustion section 20 houses a plurality of burners 24, 24,... in the left-right direction within a lower casing 23 to form a combustion chamber inside. A fan 25 that supplies combustion air to the burners 24 is provided on the lower plate of the lower casing 23. The heat exchange unit 21 accommodates a heat exchanger 27 in a cylindrical upper casing 26 whose lower end is connected to the lower casing 23. The heat exchanger 27 includes a plurality of fins 28, 28... arranged side by side at predetermined intervals in the left-right direction, and a heat transfer tube 29 that serpentines and penetrates the fins 28, 28... at right angles. The exhaust section 22 includes an exhaust box 30 and a connecting pipe 31. The exhaust box 30 is fixed onto the upper casing 26 of the heat exchange section 21 and has a rectangular shape in a plan view extending in the front-to-rear direction, with the interior communicating with the upper casing 26. The connecting pipe 31 is erected on the upper surface of the exhaust box 30 and protrudes upward, penetrating the top plate 12. The upper end of the connecting pipe 31 protrudes into the exhaust duct 16, connecting the exhaust box 30 to the exhaust duct 16.

[0011] The tank 4 is a box-shaped body that is rectangular in plan view and extends in the front-to-rear direction, and is disposed behind the heat source unit 3 and toward the rear left of the housing 2. Tank fixing plates 35, 35 are provided on the top and bottom of the rear surface of the tank 4. The tank fixing plates 35, 35 are connected to a rear left vertical frame 45 (described below) to fix the tank 4 to the vertical frame 45. On the right side of the tank 4, a water filling pipe 36 is connected between a water filling port provided at the upper front side and the water filling unit 7. A discharge pipe 37 for discharging hot water to an external dishwasher (hereinafter simply referred to as a "dishwasher") is connected to the underside of the tank 4. The discharge pipe 37 penetrates the bottom plate 10, protrudes below the bottom plate 10, and is connected to the dishwasher via an external hot water supply pipe (not shown). The internal circulation path 5 includes an internal supply pipe 38 and an internal return pipe 39 that connect the tank 4 and the heat transfer pipes 29 of the heat exchanger 27. The internal supply pipe 38 connects an supply port provided at the front lower part of the tank 4 to the inlet end of the heat transfer pipe 29 and is formed from multiple pipe members. A circulation pump 40 supported on the bottom plate 10 is incorporated into the internal supply pipe 38. A water inlet thermistor (not shown) is provided in the internal supply pipe 38. The internal return pipe 39 connects a return port provided at the rear lower part of the tank 4 to the outlet end of the heat transfer pipe 29 and is formed from multiple pipe members. A water outlet thermistor (not shown) is provided in the internal return pipe 39.

[0012] The gas supply unit 6 is disposed on the right side of the heat source unit 3 and forward of the circulation pump 40, and an external gas pipe can be connected to a gas inlet (not shown) protruding from the bottom plate 10. The gas supply unit 6 is provided with a main solenoid valve, a proportional valve, and a gas solenoid valve that open and close the internal gas flow path. The upper part of the gas supply unit 6 is connected to a manifold 41 provided on the front surface of the lower casing 23. Within the manifold 41, a gas distribution path is formed that can supply fuel gas to each burner 24. Water injection unit 7 is located in the front right corner of housing 2, to the right of heat source unit 3, and an external water pipe can be connected to a water inlet (not shown) protruding from bottom plate 10. Water injection unit 7 is provided with a water solenoid valve that opens and closes the internal water flow path. Water injection pipe 36 is connected to the top of water injection unit 7, extends rearward and upward, and is connected to tank 4. The controller 8 is disposed on the front side of the heat source unit 3, in front of the fan 25 and below the manifold 41, and is provided with an electrical circuit board . The operation unit 17 is attached to a mounting plate 43 that is installed between the left and right front vertical frames 45, 45, and is exposed to the front surface of the front panel 13 through a window provided in the front panel 13. The operation unit 17 is equipped with a power switch, a combustion lamp, and a display unit, and is electrically connected to the electrical board 42.

[0013] When this booster 1 is first installed together with a dishwasher, the rinse pump attached to the hot water supply pipe is activated. This causes hot water in the tank 4 to be supplied to the washing chamber of the dishwasher from the discharge pipe 37 via the hot water supply pipe, and is stored in the washing tank at the bottom of the washing chamber. This hot water supply continues until the washing tank is full. When washing dishes, etc. in the dishwasher, a washing pump (not shown) sends hot water from the washing tank to the washing chamber, and the hot water is circulated to wash the dishes, etc. After washing, the rinsing pump is activated and the hot water in the tank 4 is sent from the discharge pipe 37 through the hot water supply piping to the washing chamber, where rinsing is performed.

[0014] The controller 8 monitors the water level in the tank 4, and if the water level is low, opens the water electromagnetic valve of the water injection unit 7 to inject water into the tank 4 through the water injection pipe . On the other hand, when the water level in the tank 4 is high, the controller 8 operates the circulation pump 40 to circulate hot water between the heat exchanger 27 of the heat source unit 3 and the tank 4 via the internal supply piping 38 and the internal return piping 39. If the temperature of the hot water detected by the water inlet thermistor is, for example, below 85°C, the controller 8 opens the main solenoid valve and the gas solenoid valve of the gas supply unit 6 to combust the burner 24 of the heat source unit 3 and rotates the fan 25 to supply combustion air taken into the housing 2 via the air intake unit 18 to the burner 24. Thus, heat is exchanged between the hot water passing through the heat transfer tube 29 and the combustion exhaust of the burner 24. The controller 8 controls the aperture of the proportional valve and the rotation speed of the fan 25 to heat the hot water in the tank 4 until it reaches 85°C. When the temperature of the hot water reaches 85°C, the controller 8 stops the combustion of the burner 24 and the rotation of the fan 25, and also stops the operation of the circulation pump 40. The combustion exhaust from the burner 24 passes through the upper casing 26 of the heat exchange section 21, then enters the exhaust duct 16 from the exhaust box 30 of the exhaust section 22 via the connecting pipe 31, and is discharged to the outside from the exhaust duct 16.

[0015] Next, the structure of the housing 2 will be described in detail. As shown in FIG. 4, the frame structure on the bottom plate 10 consists of four vertical frames 45, 45..., a front upper frame 46, a rear upper frame 47, and two horizontal upper frames 48, 48. Raised portions 49A, 49A and 49B, 49B are formed on the four sides of the bottom plate 10. Each vertical frame 45 is fixed to the front and rear of the left and right raised portions 49A, 49A and erected at the four corners of the bottom plate 10. Screw fastening portions 50, 50 that are rectangular in plan view and protrude forward are provided on both the left and right sides of the front raised portion 49B. The front upper frame 46 is installed between the upper ends of the front left and right vertical frames 45, 45. The rear upper frame 47 is installed between the upper ends of the rear left and right vertical frames 45, 45. The horizontal upper frames 48, 48 are respectively installed between the upper ends of the left, right, front and rear vertical frames 45, 45 in a state in which the front upper frame 46 and the rear upper frame 47 are installed. As shown in Fig. 5, the left and right raised portions 49A, 49A have a stepped shape consisting of outer raised portions 51 extending directly upward from the outermost left and right sides, step portions 52 bent inward from the upper ends of the outer raised portions 51 to the left and right, and inner raised portions 53 extending directly upward from the inner ends of the step portions 52. A pair of L-shaped slits 54, 54 are formed at the front and rear of each step portion 52, with one end extending in the front-rear direction and the other end extending in the left-right direction, and are oriented symmetrically in the front-rear direction. A pair of front and rear internal screw holes 55, 55 for attaching the vertical frames 45, 45 are formed at the front and rear of the inner raised portion 53 above the L-shaped slits 54, 54.

[0016] The vertical frames 45 are symmetrical in shape from front to back and from left to right, and the diagonally opposite vertical frames 45, 45 have the same shape but are arranged facing in different directions. Figure 5 shows the front left and right vertical frames 45, 45. The vertical frame 45 is a band-shaped plate in a side view that extends vertically with a predetermined width in the front-to-rear direction, and has a protrusion formed in the front-to-rear center that protrudes outward to the left and right over its entire length. Thus, the vertical frame 45 is formed with an outer flat surface 56 located at the outermost left and right positions, a pair of inner flat surfaces 57, 57 located laterally inward of the outer flat surface 56, and a pair of connecting surfaces 58, 58 connecting the outer flat surface 56 and the inner flat surface 57, 57. Folded portions 59, 59 that fold inward to the left and right are formed at both front and rear end edges of each inner flat surface 57, 57. A pair of L-shaped cross-sectional insertion portions 60, 60 are formed at the lower end of the vertical frame 45, extending downward from the front and rear inner flat surfaces 57 and the connecting surface portions 58. The insertion portions 60, 60 can be inserted into the L-shaped slits 54, 54 of the step portion 52. However, the length of the portion of each insertion portion 60 extending forward or backward is slightly shorter than the length of the inner flat surface 57 in the same direction, and the front-to-rear end of the insertion portion 60 is located rearward or forward of the end of the inner flat surface 57. Therefore, even when the insertion portions 60, 60 are inserted into the L-shaped slits 54, 54, a portion of the lower end of each inner flat surface 57 abuts against the upper surface of the step portion 52.

[0017] A pair of lower notches 61, 61 are formed upward from the lower end at the bottom of the front and rear folded portions 59, 59. The inner raised portion 53 can be inserted and engaged from below into the lower notches 61, 61. As shown in Figure 6, one of the folded portions 59 is formed with a plurality of screw holes 62, 62... for attaching the front and rear panels 13, 14 and the front and rear upper frames 46, 47, and a vertical slit 63 extending in the up-down direction. Panel screw holes 64, 64 are formed at two locations, top and bottom, of the outer flat surface 56 for attaching the side panel 15. A pair of front and rear attachment through-holes 65, 65 are formed at the lower end of each inner flat surface 57 for screwing to the inner raised portion 53. At the top of the vertical frame 45, a pair of front and rear upper frame screw holes 66, 66 are formed at the upper end of each inner flat surface portion 57, for screwing the horizontal upper frame 48. Similarly, at the top, a pair of upper notches 67, 67 are formed downward from the upper end at the boundary between the front and rear inner flat surfaces 57, 57 and the connecting surface portions 58, 58. A pair of front and rear locking protrusions 68, 68 that protrude upward are formed at the upper ends of the front and rear folded portions 59, 59. In each inner flat surface portion 57, clamp fixing holes 69, 69·· are formed between the mounting through-hole 65 and the upper frame screw hole 66, into which a wire connection clamp is inserted and fixed.

[0018] The front upper frame 46 has an inverted L-shape in side view, and includes a horizontal front upper plate 70 extending in the left-right direction and a front plate 71 hanging downward from the front end of the front upper plate 70. The front plate 71 is folded forward except for both left and right ends, and then a panel fixing portion 72 is cut and formed in the front plate 71, which has an L-shape in side view and an upward-pointing front end. The upper part of the front panel 13 can be screwed to the front end of the panel fixing portion 72. At both left and right ends of the front upper plate portion 70, front screw holes 73, 73 for the top plate are formed for attaching the lateral upper frames 48, 48 and the top plate 12. The left and right ends of the front plate portion 71 can be screwed to the front folded portions 59, 59 of the left and right front vertical frames 45, 45 using screw holes 62, 62 at the top of the front folded portions 59, 59. Front square holes 74, 74 that straddle both plate portions are provided at the boundary between the front upper plate portion 70 and the front plate portion 71 at both left and right ends of the front upper frame 46. Locking protrusions 68, 68 provided at the upper ends of the front folded portions 59, 59 of the front left and right vertical frames 45, 45 can pass through the front square holes 74, 74.

[0019] The rear-upper frame 47 has the same structure as the front-upper frame 46 except for the panel fixing portion 72, and as shown in Figures 3 and 4, is in an inverted L-shape in side view, having a horizontal rear-upper plate portion 75 extending in the left-right direction and a rear plate portion 76 hanging downward from the rear end of the rear-upper plate portion 75. Top plate rear screw holes 77, 77 (Figure 10) for attaching the horizontal upper frames 48, 48 and the top plate 12 are formed on both left and right ends of the rear-upper plate portion 75. The left and right ends of the rear plate 76 can be screwed to the folded portions 59, 59 using screw holes 62, 62 at the top of the rear folded portions 59, 59 of the left and right rear vertical frames 45, 45. 3 and 10, rear rectangular holes 78, 78 are provided at the boundary between the rear upper plate portion 75 and the rear plate portion 76 on both left and right ends of the rear upper frame 47. Locking protrusions 68, 68 provided on the upper ends of the rear folded portions 59, 59 of the left and right rear vertical frames 45, 45 can pass through the rear rectangular holes 78, 78.

[0020] The horizontal upper frames 48, 48 are bilaterally symmetrical and have an inverted L-shape when viewed from the front, with a horizontal upper plate portion 80 extending horizontally in the front-to-rear direction and horizontal plate portions 81 hanging downward from the left and right outer edges of the horizontal upper plate portion 80. Upper through holes 82, 82 are formed at both the front and rear ends of the horizontal upper plate portion 80 for screwing the front upper frame 46 and the rear upper frame 47 to the top plate 12. Locking holes 83, 83 extending in the left-to-right direction are formed at the front and rear of the horizontal upper plate portion 80 between the upper through holes 82, 82. The locking holes 83, 83 can be engaged with the locking protrusions 68 provided at the upper ends of the rear folded-back portions 59 of the front vertical frame 45 and the locking protrusions 68 provided at the upper ends of the front folded-back portions 59 of the rear vertical frame 45. Cutouts 84, 84 are formed on both the front and rear ends of the horizontal plate portion 81. The cutouts 84, 84 correspond to the upper notches 67, 67 provided on the upper ends of the front and rear vertical frames 45, 45, respectively, and when the cutouts 84, 84 are engaged from above in line with the upper notches 67, 67, the upper ends of the cutouts 84, 84 engage with the lower ends of the upper notches 67, 67. Horizontal through holes 85, 85 are formed in front and behind each cutout 84 in the horizontal plate portion 81, respectively, for screwing to the inner flat surfaces 57, 57 of the vertical frames 45, 45.

[0021] When assembling the housing 2 having this frame structure, first, the vertical frame 45 is provisionally assembled to the front and rear of the raised portions 49A of the bottom plate 10. The lower notches 61 of the vertical frame 45 are aligned with the inner raised portion 53, and the insertion portions 60 at the lower ends are inserted from above into the L-shaped slits 54 formed in the step portion 52. As shown in FIG. 7 , the lower ends of the outer flat portion 56 and the inner flat portions 57 abut the upper surface of the step portion 52, and the upper end of the inner raised portion 53 engages with the lower notch 61, creating an upright provisionally assembled state. At this time, the front and rear mounting holes 65 of the inner flat portion 57 are positioned outside the front and rear internal screw holes 55 of the inner raised portion 53. The outer flat portion 56 is positioned on the same plane as the outer raised portion 51 and does not protrude outward to the left or right from the outer raised portion 51. By inserting the insertion portions 60, 60, left and right and front and rear movement of the vertical frame 45 is restricted even in the temporary assembled state. In particular, by locking the inner raised portion 53 into the lower notch 61, tilting of the vertical frame 45 in the left and right direction is effectively restricted.

[0022] Meanwhile, at the upper end of the vertical frame 45, the front upper frame 46 is placed with the front plate portion 71 positioned in front of the folded-back portions 59, 59 of the front left and right vertical frames 45, 45, and the left and right ends of the front upper plate portion 70 are placed on the upper ends of the left and right inner flat portions 57, 57 of the vertical frames 45, 45, with the left and right front square holes 74, 74 aligned with the positions of the left and right locking protrusions 68, 68. Then, the locking protrusions 68, 68 are locked in the front square holes 74, 74, respectively, and the front upper frame 46 is installed between the front left and right vertical frames 45, 45. Similarly, the rear upper frame 47 is positioned with the rear plate portion 76 behind the folded-back portions 59, 59 of the left and right rear vertical frames 45, 45, and the left and right rear square holes 78, 78 are aligned with the positions of the left and right locking protrusions 68, 68, and the left and right ends of the rear upper plate portion 75 are placed on the upper ends of the left and right inner flat portions 57, 57 of the vertical frames 45, 45. Then, the locking protrusions 68, 68 are locked in the rear square holes 78, 78, respectively, and the rear upper frame 47 is installed between the left and right rear vertical frames 45, 45.

[0023] The front and rear locking holes 83 of each upper horizontal frame 48 are aligned with the rear locking projection 68 of the front vertical frame 45 and the front locking projection 68 of the rear vertical frame 45, and the front and rear notches 84 of the horizontal plate portion 81 are locked with the upper notches 67 of the front and rear vertical frames 45. At this time, the front locking projection 68 of the front upper frame 46 is locked with the front square hole 74 of the front upper plate portion 70, so the front upper frame 46 will not tilt forward even when placed on the left and right vertical frames 45. This allows the upper horizontal frame 48 to be set smoothly. 8, the upper ends of the notches 84, 84 abut against the lower ends of the upper notches 67, 67, and the front and rear ends of the horizontal upper plate portion 80 rest on the ends of the front upper frame 46 and the rear upper frame 47, respectively, with the locking protrusions 68, 68 locking into the front and front locking holes 83, 83. Thus, the horizontal upper frames 48, 48 are installed between the front and front vertical frames 45, 45, and the front and rear upper through holes 82, 82 of the horizontal upper plate portion 80 are positioned above the top plate front screw hole 73 of the front upper frame 46 and the top plate rear screw hole 77 of the rear upper frame 47, and the horizontal through holes 85, 85 of the horizontal plate portion 81 are positioned outside the left and right upper frame screw holes 66, 66 of the inner flat surfaces 57, 57. In this pre-assembled state, in addition to the engagement between the cutout portion 84 and the upper notch 67, the lateral upper plate portion 80 presses down on each end of the front upper frame 46 and the rear upper frame 47 from above, effectively preventing misalignment between the frames.

[0024] In this temporary assembled state, at the lower end of each vertical frame 45, the screws 90, 90 inserted from the left and right outside into the mounting through holes 65, 65 of the inner flat portions 57, 57 are screwed into the inner screw holes 55, 55 of the inner upright portion 53. This fixes the lower end of each vertical frame 45 to the inner upright portion 53. At the upper end of each vertical frame 45, the screws 90, 90 inserted from the left and right outside into the horizontal through holes 85, 85 of the horizontal plate portions 81 of the upper horizontal frames 48, 48 are screwed into the upper frame screw holes 66, 66 of the inner flat portions 57, 57 of the vertical frame 45. In the upper front frame 46, screws 91, 91 inserted from the front into the left and right sides of the front plate portion 71 are screwed into the screw holes 62, 62 of the left and right folded portions 59, 59. As shown in FIG. 10, in the rear upper frame 47, screws 92, 92 inserted from the rear into the left and right sides of the rear plate portion 76 are screwed into the screw holes 62, 62 of the left and right folded portions 59, 59. This connects the vertical frames 45 to the front upper frame 46, the rear upper frame 47, and the left and right horizontal upper frames 48, 48. The temporarily assembled frames are engaged with each other and are less likely to shift position, so the screwing work can be done quickly and easily.

[0025] The top panel 12 and each panel are attached in the following order: rear panel 14, side panels 15, 15, top panel 12, and front panel 13. 9 and 10, forward-facing rear locking pieces 95 are formed on the upper left and right edges of the rear panel 14. Rear insertion holes (not shown) that open to the left and right are formed on the lower sides of the rear locking pieces 95. The rear panel 14 is fixed by threading screws 93 that pass through the lower part of the rear panel 14 from the rear into the rear upright portion 49B of the bottom plate 10, with the left and right rear locking pieces 95 inserted into the vertical slits 63 formed in the folded-back portions 59 of the left and right vertical frames 45. Horizontal locking pieces 96 that protrude inward on the left and right are formed on the rear edge of the side panel 15. With the horizontal locking pieces 96 inserted into the rear insertion holes of the rear panel 14, the side panel 15 is fixed by threading screws 94, 94... that pass through the side panel 15 from the outside on the left and right into the panel screw holes 64, 64 in the outer flat portions 56, 56 of the front and rear vertical frames 45, 45, respectively.

[0026] At this time, even if the screws 90, 90 that secure the upper and lower ends of the vertical frame 45 protrude from the inner flat portion 57, as shown in Figure 9, a gap S that is larger than the amount of protrusion of the screws 90 in the left-right direction is formed between the side panel 15 that is placed against the outer flat portion 56 and the inner flat portion 57, so the screws 90 do not interfere with the attachment of the side panel 15. This is also the case when the wiring clamp 100 is inserted and fixed in the clamp fixing hole 69 provided in the inner flat portion 57; since the gap S is larger than the amount of protrusion in the left-right direction of the insertion end of the wiring clamp 100 that protrudes from the inner flat portion 57, the insertion end of the wiring clamp 100 does not interfere with the attachment of the side panel 15.

[0027] The top panel 12 has a shallow bottom with all four sides folded downward, front, rear, left, and right. The top panel 12 is placed over each upper frame from above so that the front fold is positioned in front of the front plate portion 71 of the front upper frame 46, the rear fold is positioned behind the rear plate portion 76 of the rear upper frame 47, and the left and right folds are positioned outside the horizontal plate portions 81 of the lateral upper frames 48. In this state, screws 93 (FIG. 2) that pass through the rear fold from the rear are screwed into the upper part of the rear panel 14, and screws 94 (FIG. 2) that pass through the left and right folds and the upper parts of the side panels 15 from the outside, left and right, are screwed into the horizontal plate portions 81 of the lateral upper frames 48. At the four corners of the tabletop 12, screws 97, 97... are passed through from above and inserted into the upper through holes 82, 82 at the front and rear ends of the lateral upper frames 48, 48, respectively, and screwed into the left and right front tabletop screw holes 73, 73 of the front upper frame 46 and the left and right rear tabletop screw holes 77, 77 of the rear upper frame 47 (Figure 10). Then, the top panel 12 is fixed to the front upper frame 46, the rear upper frame 47, and the left and right lateral upper frames 48, 48, and the upper portions of the rear panel 14 and the side panels 15, 15 are also fixed.

[0028] The front panel 13 has a shallow bottom with all four sides folded back toward the rear. With the air intake unit 18 attached, the front panel 13 is hung from above by engaging its upper end with the front end of the panel fixing portion 72 of the upper-front frame 46 on the front side of the bottom plate 10 and top plate 12, and the operation unit 17 attached to the mounting plate 43 is fitted into the window. In this state, as shown in FIG. 2, screws 98, 98 passing through the upper part of the front panel 13 from the front are screwed into the front end of the panel fixing portion 72, and screws 98, 98 passing through the lower part of the front panel 13 from the front are screwed into the screw fastening portions 50, 50 of the bottom plate 10. This fixes the front panel 13 to the upper-front frame 46 and the bottom plate 10.

[0029] In this way, in the booster 1 of the above-described form, upwardly extending raised portions 49A, 49A are formed on the left and right side edges of the bottom plate 10, respectively, and each raised portion 49A is formed in a stepped shape consisting of an outer raised portion 51 extending upward from the side edge of the bottom plate 10, a step portion 52 bent inward from the upper end of the outer raised portion 51, and an inner raised portion 53 extending upward from the inner end of the step portion 52. Each vertical frame 45 is a strip-shaped plate that has a front-to-rear width extending along the inner raised portion 53 on the step portion 52 and is erected vertically. It has inner flat portions 57, 57 that are screwed to the outer surface of the inner raised portion 53 at both front and rear ends, outer flat portions 56 that protrude outward to the left and right between the inner flat portions 57, 57 and to which the side panels 15 are screwed, and a pair of connecting surface portions 58, 58 that connect each of the inner flat portions 57, 57 and the outer flat portion 56, and an insertion portion 60 that protrudes downwardly beyond the outer flat portion 56 is formed at the lower end of each of the inner flat portions 57 and each connecting surface portion 58. Each step portion 52 is formed with an L-shaped slit 54 (an example of a bottom plate-side slit) into which each insertion portion 60 is inserted at the mounting position of each vertical frame 45.

[0030] According to this configuration, by inserting the insertion portions 60 of the vertical frames 45 into the L-shaped slits 54 provided in the rising portions 49A, it is possible to restrict left-right and front-rear movement of the vertical frames 45 even in a provisionally assembled state. Therefore, the assembly work from provisionally assembling the vertical frames 45 of the housing 2 to fastening the screws can be carried out efficiently. In particular, because the side panels 15 are fastened to the outer flat portions 56 with screws, the heads of the screws fastening the inner flat portions 57 to the rising portions 49A can escape into the gap between the inner flat portions 57 and the side panels 15, without interfering with the attachment of the side panels 15. Furthermore, the vertical frame 45 can be standardized, which also leads to a reduction in manufacturing costs.

[0031] At both the front and rear ends of each vertical frame 45, there are formed folded portions 59, 59 that are bent inward from the edge of each inner flat portion to the left and right, and at the lower end between the folded portions 59, 59 and the inner flat portions 57, 57, there are formed upward lower notches 61 (an example of a frame side slit) into which the upper end of the inner raised portion 53 is inserted and engaged at the installation position. Therefore, tilting or misalignment of the vertical frame 45 in the left-right direction in the provisionally assembled state can be effectively prevented, making the assembly work easier. Each inner flat portion 57 is formed with a clamp fixing hole 69 for fixing a wire connection clamp 100 thereto. Therefore, the wire connection clamp 100 can be attached without interfering with the attachment of the side panel 15 by utilizing the gap between the inner flat portion 57 and the side panel 15 .

[0032] In addition, the following modifications are possible in the disclosure relating to the assembly structure of the vertical frame to the bottom plate. In the above embodiment, the insertion portion is L-shaped to match the L-shaped slit that serves as the bottom plate slit, but the insertion portion may be separated into a portion that protrudes from the inner flat surface portion and a portion that protrudes from the connecting surface portion. In this case, the bottom plate slit may also not be L-shaped, but may be separated into a portion that extends in the front-rear direction and a portion that extends in the left-right direction. The frame-side slit is not limited to the lower cut as described above. The length and shape can be changed as appropriate. The frame-side slit does not have to be provided. The folded-back portions are not limited to those provided at the front and rear of the vertical frame, but may be provided at only one of the front and rear. In this case, the frame-side slits are also provided at only one of the front and rear.

[0033] The width of the outer flat surface portion and the inner flat surface portion in the front-to-rear direction is not limited to the above-described form and can be changed as appropriate. The connecting surface portion may be tapered so that the front-to-rear width narrows toward the left and right outside, and the outer flat surface portion and the connecting surface portion may be trapezoidal in plan view. The positions and numbers of the screw holes, screw holes, and clamp fixing holes may also be changed as appropriate. The clamp fixing holes do not have to be provided on the vertical frame. In this disclosure, the assembly structure of each upper frame onto the top of the vertical frame is not limited to the above-described form. For example, the upper notch of the vertical frame and the notch of the horizontal upper frame may be eliminated. Instead of a structure in which the ends of the horizontal upper frame are placed on the ends of the front and rear upper frames, a structure in which the ends of the front and rear upper frames are placed on the ends of the horizontal upper frame may be adopted.

[0034] In addition, in the booster 1 of the above-described form, each vertical frame 45 is a strip-shaped plate that has a front-to-rear width extending along the raised portion 49A and is erected in the vertical direction, and includes inner flat portions 57, 57 that are screwed to the outer surface of the raised portion 49A at both front and rear ends, outer flat portions 56 that protrude outward to the left and right between the inner flat portions 57, 57 and to which the side panels 15 are screwed, a pair of connecting surface portions 58, 58 that connect each inner flat portion 57 and the outer flat portion 56, and upper notches 67 (an example of a slit for the upper frame) that are cut downward from the upper end between each inner flat portion 57 and each connecting surface portion 58. Each upper horizontal frame 48 has a horizontal plate portion 81 that extends in the front-to-rear direction along the outer surface of each inner flat portion 57 of the two vertical frames 45, 45 that are lined up in front and behind and is screwed to the inner flat portion 57, and each horizontal plate portion 81 has a notch portion 84 that engages with each upper notch 67 from above at the attachment position to the vertical frame 45. According to this configuration, the front and rear vertical frames 45, 45 and the horizontal upper frame 48 are firmly pre-assembled, so that the assembly work from pre-assembling the vertical frame 45, the front upper frame 46, the rear upper frame 47, and the horizontal upper frame 48 (an example of an upper frame) of the housing 2 to screwing can be carried out efficiently.

[0035] Each horizontal upper frame 48 further has a horizontal upper plate portion 80 that is installed between the upper ends of two vertical frames 45, 45 that are lined up in a front-to-back arrangement, and the front upper frame 46 and the rear upper frame 47 have a front upper plate portion 70 and a rear upper plate portion 75 that are installed at their left and right ends between the upper ends of two vertical frames 45, 45 that are lined up in a left-to-right arrangement, and the horizontal upper plate portion 80 overlaps the front upper plate portion 70 and the rear upper plate portion 75 from above at the mounting position, and sandwiches the front upper plate portion 70 and the rear upper plate portion 75 between the upper ends of the vertical frames 45. Therefore, the vertical frame 45, the front upper frame 46, the rear upper frame 47, and the horizontal upper frame 48 are more integrated in the provisionally assembled state, and displacement of each frame can be more effectively prevented. Each vertical frame 45 has a folded portion 59 that is bent inward to the left and right from the edge of each inner flat portion 57, and an upward locking protrusion 68 is formed at the upper end of each folded portion 59, and a locking hole 83 (an example of a locking portion) is formed in the lateral upper plate portion 80 with which the locking protrusion 68 locks when in the mounting position, and a front square hole 74 and a rear square hole 78 (an example of a locking portion) are formed in the front upper plate portion 70 and the rear upper plate portion 75 with which the locking protrusion 68 locks when in the mounting position. Therefore, the vertical frame 45, the front upper frame 46, the rear upper frame 47, and the horizontal upper frame 48 are more integrated in the provisionally assembled state, and misalignment of the frames can be more effectively prevented. In particular, the front upper frame 46, which has been set first, can be prevented from tipping forward when assembling the horizontal upper frame 48, making it easier to provisionally assemble the horizontal upper frame 48.

[0036] In addition, in the disclosure regarding the temporary assembly of the vertical frame and each upper frame, the following modifications are possible. The upper notches and notches may be formed to the same depth, or one may be formed deeper than the other, as long as they are capable of engaging the horizontal upper frame with the upper end of the vertical frame in a mutually engaged state. The notches do not have to be formed with a front-to-back width that spans and engages the two upper notches, but two notches may be provided at the front and back for each upper notch. The horizontal plate portions of the horizontal upper frames are not limited to the above-described structure in which the vertical width is the same along the entire length in the front-to-rear direction. For example, the width of the middle portion, excluding the front and rear portions connected to the vertical frames, may be smaller than the width of the front and rear portions. Similarly, the horizontal upper plate portions may have a smaller lateral width than the front and rear portions, excluding the front and rear portions located on the vertical frames. In the above embodiment, the horizontal upper plate portions of the horizontal upper frames overlap both the front upper plate portion of the front upper frame and the rear upper plate portion of the rear upper frame from above, but this is not limited to both, and the horizontal upper plate portions may overlap only one of the front or rear upper plate portions. Furthermore, this overlapping structure may be eliminated entirely. The locking structure between the locking protrusions on the folded portions and the locking holes on the front upper plate portion may also be omitted. Therefore, the horizontal upper plate portions may be eliminated.

[0037] The locking structure between the front square holes of the front upper frame and the rear square holes of the rear upper frame and the locking protrusions on the front and rear folded portions is not limited to both the front and rear, and the rear locking structure may be eliminated and only the locking structure between the front square holes and the front locking protrusions may be adopted. However, if there is no risk of the front upper frame tipping over, the front locking structure may also be omitted. The width of the outer flat surface portion and the inner flat surface portion in the front-to-rear direction is not limited to the above-described form and can be changed as appropriate. The connecting surface portion may be tapered so that the front-to-rear width narrows toward the left and right outside, and the outer flat surface portion and the connecting surface portion may be trapezoidal in plan view. In this disclosure, the assembly structure of the vertical frame to the bottom plate is not limited to the above-described form. For example, the bottom plate-side slit of the step of the rising part and the insertion part of the vertical frame may be eliminated, or the engagement structure between the frame-side slit and the upper end of the rising part may be eliminated.

[0038] In addition, as is common to all disclosures, the shape and mounting structure of each panel can be modified as appropriate. For example, the front panel can be plate-shaped instead of a shallow box-shaped, and conversely, the other panels can be shallow box-shaped. The top panel can also be plate-shaped. The rear panel does not need to have a rear locking piece that locks into the vertical slit in the folded portion. The rear insertion hole and horizontal locking piece between the rear panel and the side panel may be reversed, with the locking piece provided on the rear panel and the insertion hole provided on the side panel. However, these may be omitted and the top plate and each panel may be screwed separately to the frame. The frame structure of the housing may have only the left and right side panels. The position and structure of the heat source unit and the position and structure of the tank within the housing can also be changed as appropriate. For example, the heat source unit and tank can be positioned to the right instead of the left, and the internal circulation path can be positioned on the left. The number and shape of the pipe members forming the internal supply piping and internal return piping of the internal circulation path can also be changed as appropriate. The positions and structures of the gas supply unit, water injection unit, and controller are also not limited to the above forms. Casters may be provided instead of the legs on the bottom plate. [Explanation of symbols]

[0039] 1· Dishwasher booster, 2· Housing, 3· Heat source unit, 4· Tank, 5· Internal circulation path, 6· Gas supply section, 7· Water injection section, 8· Controller, 10· Bottom plate, 12· Top plate, 13· Front panel, 14· Rear panel, 15· Side panel, 20· Combustion section, 21· Heat exchange section, 22· Exhaust section, 38· Internal supply piping, 39· Internal return piping, 40· Circulation pump, 45· Vertical frame, 46· Front upper frame, 47· Rear upper frame Frame, 48... Horizontal upper frame, 49A, 49B... Raised portion, 51... Outer raised portion, 52... Step portion, 53... Inner raised portion, 54... L-shaped slit, 56... Outer flat portion, 57... Inner flat portion, 58... Connecting surface portion, 60... Insertion portion, 61... Lower notch, 67... Upper notch, 68... Locking protrusion, 70... Front upper plate portion, 71... Front plate portion, 75... Rear upper plate portion, 76... Rear plate portion, 80... Horizontal upper plate portion, 81... Horizontal plate portion, 83... Locking hole, 84... Cutout portion.

Claims

1. A housing including a bottom plate that is rectangular or square in plan view and has upwardly extending raised portions formed on the left and right side edges, four vertical frames erected at the four corners of the bottom plate, two left and right horizontal upper frames that are installed between the upper ends of the two vertical frames lined up in a front-to-back relationship, two front upper frames and a rear upper frame that are installed between the upper ends of the two vertical frames lined up in a left-to-right relationship, and side panels attached to the vertical frames at least on the left and right side surfaces, The system accommodates a heat source unit, a tank for storing water, and an internal circulation path that includes a circulation pump and circulates the water in the tank between the heat source unit and the tank, A dishwasher booster that can operate the circulation pump to circulate water in the tank between the tank and the heat source unit through the internal circulation path, heat the water in the heat source unit, and supply the heated water to an external dishwasher, Each of the vertical frames is a strip-shaped plate that has a front-to-rear width extending along the upright portion and is erected in the vertical direction, and includes an inner flat surface that is screwed to the outer surface of the upright portion at both front and rear ends, an outer flat surface that protrudes outward to the left and right between the inner flat surfaces and to which the side panels are screwed, a pair of connecting surface portions that connect each of the inner flat surface portions and the outer flat surface portions, and an upper frame slit that is cut downward from the upper end between each of the inner flat surface portions and each of the connecting surface portions, Each of the horizontal upper frames has at least a horizontal plate portion that extends in the front-to-rear direction along the outer surface of each of the inner flat portions of the two vertical frames lined up in front and behind and is screwed to the inner flat portion, and each of the horizontal plate portions has a notch formed in it that engages with each of the upper frame slits from above at the attachment position to the vertical frame.

2. Each of the horizontal upper frames further includes a horizontal upper plate portion that is bridged between the upper ends of the two vertical frames that are arranged in front and behind each other, the front upper frame and / or the rear upper frame have a front upper plate portion and / or a rear upper plate portion whose left and right ends are bridged between upper ends of the two vertical frames aligned left and right, A booster for a dishwasher as described in claim 1, characterized in that the horizontal upper plate portion overlaps the front upper plate portion and / or the rear upper plate portion from above at the mounting position, and clamps the front upper plate portion and / or the rear upper plate portion between the upper end of the vertical frame and the horizontal upper plate portion.

3. Each of the vertical frames has a folded portion that is folded inwardly to the left and right from an edge of each of the inner flat portions, and an upward locking protrusion is formed on an upper end of each of the folded portions, A booster for a dishwasher as described in claim 2, characterized in that the lateral upper plate portion, the front upper plate portion and / or the rear upper plate portion have engaging portions formed thereon to engage with the engaging protrusions at the mounting position.

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