Booster for dishwasher

Abstract

To prevent hot water containing air from being supplied to a heat source unit by suppressing generation of bubbles when injecting water into a tank.SOLUTION: In a booster 1 for a dishwasher, an internal circulation passage 5 includes an internal inward pipe 47 in which a circulation pump is provided, and hot water flows from a tank 4 to a heat source unit, and an internal return pipe 48 in which hot water flows from the heat source unit to the tank 4. A partition wall is provided in the tank 4 for separating a front side region E1 provided with an inlet 40, to which the internal inward pipe 47 is connected below the inlet 40, and a rear side region to which the internal return pipe 48 is connected in a state that the movement of hot water is allowed. The front side region E1 is provided with a receiving member 70 having a receiving surface 74 provided between the inlet 40 and a full water position L, and intersecting with a water falling direction of the water injected from the inlet 40, and a guide surface 75 connected to the receiving surface 74 for guiding the water falling on the receiving surface 74 downward.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a dishwasher booster that is installed to supply hot 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, a tank that stores hot water, and an internal circulation path that includes a supply pipe and a return pipe connected between the heat source unit and the tank. The hot water in the tank can be supplied to the dishwasher via an external hot water supply pipe. In this dishwasher booster, when a float switch installed in the tank detects a drop in the water level, tap water is replenished through a water inlet installed at the top. Meanwhile, when a thermistor installed in the tank detects a drop in the water temperature from a predetermined temperature, the heat source unit is activated and a pump installed in the supply pipe is operated, heating the water in the tank while circulating it between the heat source unit and the tank via an internal circulation path, thereby maintaining the temperature. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-141253 Summary of the Invention [Problem to be solved by the invention]

[0004] In a dishwasher booster, when tap water is supplied from the inlet, the water poured from the top of the tank strikes the lower water surface with great force. If air bubbles are generated by this collision, when the heat source unit and pump are activated, hot water containing air will be sent to the heat source unit. This causes uneven heating, takes time to reach the desired temperature, and reduces thermal efficiency.

[0005] Therefore, the present disclosure aims to provide a booster for a dishwasher that can suppress the generation of bubbles when water is poured into the tank, thereby preventing hot water containing air from being supplied to the heat source unit. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides a heat source unit, a tank capable of storing hot and cold water up to a predetermined full water position and having a water inlet at a position higher than the full water position; an internal circulation path that includes a circulation pump and circulates the water in the tank between the tank and the heat source unit; 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, The internal circulation path includes a forward pipe in which the circulation pump is provided and through which hot water flows from the tank to the heat source unit, and a return pipe through which hot water flows from the heat source unit to the tank, The tank is provided with a partition wall that separates a first area, in which the water inlet is provided and to which the outgoing pipe is connected below the water inlet, from a second area, in which the return pipe is connected, in a state that allows hot and cold water to pass back and forth. The first region is characterized by having a receiving member provided between the water inlet and the full water position, the receiving member including a receiving surface that intersects with the direction in which water poured from the water inlet falls, and a guide surface that is continuous with the receiving surface and guides the water that falls onto the receiving surface downward. Another aspect of the present disclosure is characterized in that, in the above configuration, a second partition wall is provided below the receiving member, arranged in a vertical direction, which guides the water guided by the guide surface below the guide surface, and whose lower part faces the inlet of the supply pipe and has a gap between it and the lower inner surface of the tank. [Effects of the Invention]

[0007] According to the present disclosure, the receiving member can weaken the force of the poured water as it enters the hot water in the tank, thereby suppressing the generation of air bubbles when pouring water into the tank and preventing hot water containing air from being supplied to the heat source unit. In another aspect of the present disclosure, a second partition wall is provided that guides the water guided by the guide surface below the guide surface, and has a lower portion facing the inlet of the supply pipe and has a gap between it and the lower inner surface of the tank. According to this aspect, the hot water in the tank passes under the lower end of the second partition wall before reaching the inlet of the supply pipe, thereby separating air bubbles contained in the hot water, which makes it possible to more effectively prevent hot water containing air from being supplied to the heat source unit. [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] This is an oblique view showing the state where the top plate and the front, rear, left and right outer panels are omitted, from the upper right rear. [Figure 4] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 5] FIG. 2 is a perspective view showing the rear of the tank with a rear wall and a left wall partly cut away. [Figure 6] FIG. 3 is an enlarged cross-sectional view taken along the line BB in FIG. 2. [Figure 7] FIG. 2 is a perspective view showing the entire tank with a top wall, a front wall, and a left wall partially cut away. [Figure 8] FIG. 7 is a cross-sectional view taken along line CC in FIG. 6. [Figure 9] FIG. 9 is a cross-sectional view taken along the line DD in FIG. 8. 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 according to the present disclosure, FIG. 2 is a central vertical cross-sectional view, and FIG. 3 is a perspective view showing the booster from above the right rear with the top plate and the front, rear, left and right outer panels omitted. FIG. 4 is an enlarged cross-sectional view taken along line AA in FIG. 2. Note that in the booster 1 of this embodiment, the outer panel 15 on which the operating unit 17 and air intake unit 18 described below are provided will be described as the front (front face).

[0010] 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 includes a bottom plate 10, a top plate 11, four legs 12, 12··, four vertical frames 13, 13··, four horizontal frames 14, 14··, and four outer panels 15, 15··. The bottom plate 10 is rectangular in plan view, with each of its four sides folded upward. The legs 12 are attached downward to the four corners of the underside of the bottom plate 10, supporting the bottom plate 10 horizontally. The vertical frames 13 are fixed to the folded portions of the bottom plate 10 and erected at the four corners of the bottom plate 10. The horizontal frames 14 are installed between the upper ends of the vertical frames 13, 13 adjacent to each other in the front, rear, left, and right directions. The top plate 11 is attached to the horizontal frames 14, 14··, and closes the top surface of the housing 2. An exhaust duct 16 is provided on the top surface of the top plate 11 and is connected to an exhaust section 22 (described later) of the heat source unit 3. The outer panels 15 are attached to the front, rear, left and right sides of the housing 2, which is surrounded by the bottom plate 10, the top plate 11, the vertical frames 13 and the horizontal frames 14, to close off each face. The front outer panel 15 is provided with an operating unit 17 on the upper side and an air intake unit 18 on the lower side.

[0011] 4, the heat source unit 3 is disposed in the front and left side of the housing 2. The heat source unit 3 includes, from bottom to top, a combustion section 20, a heat exchange section 21, and an exhaust section 22. 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 unit 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 unit 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, penetrates the top plate 11, and has its upper end protruding into the exhaust duct 16, connecting the exhaust box 30 to the exhaust duct 16.

[0012] 4, the tank 4 is disposed behind the heat source unit 3 and toward the rear left of the housing 2. The tank 4 is a box body that is rectangular in plan view and extends in the front-to-rear direction, and has a bottom wall 4a, a top wall 4b, a front wall 4c, a rear wall 4d, a left wall 4e, and a right wall 4f. The tank 4 is supported horizontally above the bottom plate 10 by a pair of front and rear support bases 35, 35 provided on the upper surface of the bottom plate 10. A pair of tank fixing plates 36, 36 are provided above and below between the rear wall portion 4d of the tank 4 and the left rear vertical frame 13 to fix the tank 4 to the vertical frame 13. A heat source fixing plate 37 is attached to the front wall 4c of the tank 4. The heat source fixing plate 37 is rectangular when viewed from the front, and an extension 23a extending rearward from the lower plate of the lower casing 23 of the heat source unit 3 is fixed to the lower front surface. A pair of exhaust unit fixing plates 38, 38 are provided on the left and right sides of the upper part of the heat source fixing plate 37. The exhaust unit fixing plates 38, 38 are fixed to the underside of the exhaust box 30 that protrudes rearward from the upper casing 26. Therefore, the heat source unit 3 is supported on the front side of the tank 4 by the heat source fixing plate 37 and the exhaust unit fixing plate 38.

[0013] A water inlet 40, a supply port 41, a return port 42, and an external return port 43 are provided on the right wall 4f of the tank 4. A discharge port 44 and an external supply port 45 are provided on the bottom wall 4a of the tank 4. The water inlet 40 is provided at the front upper part of the right wall 4f, and a water inlet pipe 46 connected to the water inlet 7 is connected from the right side. The inlet port 41 is provided in the front lower part of the right wall portion 4f, and is connected from the right to an internal inlet pipe 47 which is connected to the inlet end of the heat transfer tube 29 of the heat exchanger portion 21. The internal inlet pipe 47 is provided with a water inlet thermistor (not shown). The return port 42 is provided at the rear lower part of the right wall portion 4f, and is connected from the right side to an internal return pipe 48 which is connected to the outlet end of the heat transfer tube 29. The internal return pipe 48 is provided with a hot water outlet thermistor (not shown). The internal supply pipe 47 and the internal return pipe 48 are formed from a plurality of pipe members. A circulation pump 49 supported on the bottom plate 10 is connected to the internal supply pipe 47. When the circulation pump 49 is operated, the internal supply pipe 47 and the internal return pipe 48 form an internal circulation path 5 in which hot water in the tank 4 is sucked out from the internal supply pipe 47 at the bottom, passes through the heat exchange section 21, and returns to the lower part of the tank 4 from the internal return pipe 48.

[0014] As shown in Fig. 5, the discharge outlet 44 is provided in a corner of the bottom wall 4a of the tank 4, which is sandwiched between the rear wall 4d and the right wall 4f, and is connected to a discharge pipe 50 from below. The discharge pipe 50 penetrates the bottom plate 10, protrudes below the bottom plate 10, and is connected to an external hot water supply pipe (not shown) that leads to an external dishwasher (hereinafter simply referred to as "dishwasher"). An overflow pipe 51 is provided in the tank 4 on the left side of the discharge outlet 44, extending in the vertical direction. The overflow pipe 51 protrudes from the bottom wall 4a of the tank 4, penetrates the bottom plate 10, and protrudes below the bottom plate 10. 6, the internal return pipe 48 connected to the right wall 4f of the tank 4 from the right direction and the discharge pipe 50 connected to the bottom wall 4a of the tank 4 from below are arranged so that their axes AL1, AL2 intersect at right angles at the rear right corner of the tank 4. The tip of the internal return pipe 48 has a protruding pipe portion 52 that protrudes into the tank 4 beyond the inner surface of the right wall 4f. By arranging the internal return pipe 48 and the discharge pipe 50 in this corner, the outlet of the protruding pipe portion 52 of the internal return pipe 48 and the inlet of the discharge pipe 50 are close to each other.

[0015] The external return port 43 is provided below the water inlet 40 and is connected to an external return pipe 53. The external supply port 45 is provided on the front side of the bottom wall portion 4a and is connected to an external supply pipe 54. The external return pipe 53 and the external supply pipe 54 each protrude from the underside of the tank 4, penetrate the bottom plate 10, and are connected to external heat transfer return pipes and heat transfer supply pipes (not shown) below the bottom plate 10. The heat transfer supply pipe is connected to the inlet of a heat transfer section provided in the washing tank of the dishwasher, and the heat transfer return pipe is equipped with a heat transfer pump and connected to the outlet of the heat transfer section. These pipes form an external circulation path that circulates hot water in the tank 4 between the heat transfer section and the heat transfer section when the heat transfer pump is activated, transferring heat to the hot water in the washing tank.

[0016] As shown in Figures 7 and 8, a partition wall 60 is provided inside the tank 4, separating the tank 4 into a front area E1 where the water inlet 40 and the water outlet 41 are located and a rear area E2 where the water return port 42 and the water outlet 44 are located. As shown in Figures 6 and 7, the partition wall 60 is a plate whose upper end extends downward from approximately the same height as the upper end of the water inlet 40. The right edge of the partition wall 60 is attached to the right wall 4f of the tank 4 and is in contact with the right wall 4f of the tank 4 along its entire length. However, the left edge of the partition wall 60 does not contact the left wall 4e of the tank 4 and extends downward, leaving a gap between it and the left wall 4e. The lower edge of the partition wall 60 also does not contact the bottom wall 4a of the tank 4 and extends leftward, leaving a gap between it and the bottom wall 4a. The lower left portion of the partition wall 60 is bent forward at a right angle to form a second partition wall 61 that divides the front region E1 into left and right sections. Therefore, a rectangular notch 62 extending in the vertical direction is formed in the lower left portion of the partition wall 60. This allows hot and cold water to flow between the front area E1 and the rear area E2 within the tank 4. The overflow pipe 51 is located in the rear area E2. The external outlet 45 is located below the notch 62. A boil-dry prevention float switch 63 that detects a low water level is provided on the left wall 4e of the tank 4 at the bottom of the rear region E2. A full water float switch 64 that detects the full water level L shown by the two-dot chain line in Figure 8 and an overflow float switch 65 that detects an overflow state where the water level is higher than full are provided on the left wall 4e of the tank 4 at the top of the rear region E2. A tank thermistor 66 that detects the temperature of the hot and cold water is provided on the right wall 4f of the tank 4 at the bottom of the rear region E2.

[0017] A receiving member 70 is provided below the water inlet 40 in the front region E1 of the tank 4. The receiving member 70 is a plate member having a mounting plate portion 71, a horizontal plate portion 72, and a hanging plate portion 73. The mounting plate portion 71 is attached to the front surface of the partition wall 60 and horizontally supports the horizontal plate portion 72 below the external return pipe 53. The horizontal plate portion 72 has a rectangular shape in plan view and extends forward from the lower end of the mounting plate portion 71. When attached, its right edge abuts against the right wall portion 4f of the tank 4. The front edge of the horizontal plate portion 72 does not abut against the front wall portion 4c of the tank 4. The upper surface of the horizontal plate portion 72 forms a receiving surface 74 that is rectangular in plan view. The receiving surface 74 is located above the full-fill position L and overlaps the tip of the water inlet pipe 46 in the vertical direction. The water injection pipe 46 protrudes from the water injection port 40 into the tank 4, and then its tip curves downward, with its outlet facing the receiving surface 74 beyond the external return pipe 53 that protrudes into the tank 4. The left edge of the receiving surface 74 is located to the left of the end of the external return pipe 53. Hanging plate portion 73 has a rectangular shape in side view hanging downward from the left edge of horizontal plate portion 72, is perpendicular to partition wall 60, and extends downward beyond the upper end of notch 62. The lower part of hanging plate portion 73 overlaps second partition wall 61 from the left side. The left side surface of hanging plate portion 73 forms guide surface 75 which is rectangular in side view and continuous with receiving surface 74.

[0018] The second partition wall 61 has a rectangular shape in side view, with a front-to-back width slightly smaller than that of the hanging plate portion 73 of the receiving member 70, and its front end is supported by a support plate 76 attached to the front wall portion 4c of the tank 4, overlapping parallel to the hanging plate portion 73. The second partition wall 61 further divides the lower portion of the receiving member 70 in the front region E1 into a right region ER to which the internal supply piping 47 is connected, and a left region EL to which no piping is connected, as shown in Figure 9. However, the front end of the second partition wall 61 does not reach the front wall portion 4c of the tank 4, allowing hot and cold water to pass between the left and right sides. The lower end of the second partition wall 61 is located below the upper end of the internal supply pipe 47 in left-right view and faces the inlet of the internal supply pipe 47. The lower end of the second partition wall 61 does not reach the bottom wall 4a of the tank 4, leaving a gap S between the second partition wall 61 and the inner surface of the bottom wall 4a. Therefore, hot water and cold water can pass between the left and right sides below the second partition wall 61.

[0019] In Figure 3, the gas supply unit 6 is located to the right of the heat source unit 3 and forward of the circulation pump 49, 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 that opens and closes the internal gas flow path, a proportional valve, and a gas solenoid valve. The upper part of the gas supply unit 6 is connected to a manifold 55 (Figure 2) provided on the front surface of the lower casing 23. Within the manifold 55, 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 46 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 55, and is provided with an electrical board 56 (FIG. 2). The operating unit 17 is attached to a mounting plate 57 that is installed between the front left and right vertical frames 13, 13, and is exposed to the front through a window provided in the front outer panel 15. The operating unit 17 is equipped with a power switch, a combustion lamp, and a display unit, and is electrically connected to the electrical board 56.

[0020] When booster 1 having the above configuration is initially installed together with a dishwasher, the rinse pump attached to the hot water supply pipe is activated. This causes hot water in tank 4 to be supplied to the dishwasher's wash chamber from discharge pipe 50 via the hot water supply pipe, and stored in the wash tank at the bottom of the wash chamber. This hot water supply continues until the wash 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 50 through the hot water supply piping to the washing chamber, where rinsing is performed.

[0021] The controller 8 monitors the water level in the tank 4, and when the water level is lower than the full water position L detected by the full water float switch 64 (for example, when the water level is L1 as shown in Figure 9), it opens the water solenoid valve of the water injection unit 7 and injects water into the tank 4 through the water injection pipe 46. At this time, water injected into tank 4 from water injection pipe 46 is discharged downward from the tip of water injection pipe 46 as shown by arrow a in Figure 9, passes around the outer periphery of external return pipe 53 located below, and then collides with horizontal plate portion 72 of receiving member 70. Thereafter, as shown by arrow b, the water flows over receiving surface 74 of horizontal plate portion 72, wraps around to the upper end of hanging plate portion 73, and falls downward along guide surface 75 as shown by arrow c, until it reaches the water surface at water level L1. In this way, the water poured into the tank 4 from the water pouring pipe 46 is temporarily received by the receiving surface 74 of the receiving member 70 before reaching the lower water level, so the force of the water is weakened when it reaches the lower water level. This makes it difficult for bubbles to form in the hot water in the tank 4.

[0022] On the other hand, if the water level in the tank 4 is higher than the water level detected by the boil-dry prevention float switch 63, the controller 8 operates the circulation pump 49 to circulate hot and cold water between the heat exchanger 27 of the heat source unit 3 and the tank 4 via the internal supply pipe 47 and the internal return pipe 48. At this time, water in the tank 4 is sucked through the internal supply pipe 47, but water poured from the water pouring pipe 46 flows from the left area EL at the bottom of the tank 4 through the gap S between the second partition wall 61 and the inner surface of the bottom wall portion 4a of the tank 4, as shown by arrow d in Figure 9, into the right area ER and is then sucked into the internal supply pipe 47. Therefore, even if air bubbles are generated in the poured water, the air bubbles are separated from the water as the water passes under the lower end of the second partition wall 61 and through the gap S, making it difficult for air to get mixed into the internal supply pipe 47.

[0023] During circulation of hot water, if the temperature of the hot water detected by the water inlet thermistor is below 85°C, for example, the controller 8 opens the main solenoid valve and 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 the 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 opening 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, and when the temperature of the hot water reaches 85°C, stops the combustion of the burner 24 and the rotation of the fan 25, and also stops the operation of the circulation pump 49. 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.

[0024] In this way, the hot water in tank 4 that is heated while circulating through internal circulation path 5 may be continuously used in the dishwasher for processes other than rinsing. In this case of continuous use of hot water, if the dishwasher requests a supply of hot water immediately after a large amount of hot water has been supplied for rinsing, booster 1 will circulate and heat the hot water in tank 4 while simultaneously supplying the hot water from discharge pipe 50 to the dishwasher via the external hot water supply piping. Therefore, there is a risk that the hot water heated in heat source unit 3 and returning from internal return piping 48 will mix with the water in tank 4 and be sent to the dishwasher at a lower temperature. However, in this case, the distance between the outlet of the protruding pipe section 52 of the internal return pipe 48, which is located in the corner of the tank 4, and the inlet of the discharge pipe 50 is short, so the hot water returning from the protruding pipe section 52 to the inside of the tank 4 is completely mixed with the hot water stored in the tank 4, as shown by arrow e in Figure 5, and is sucked into the discharge pipe 50 and sent to the dishwasher before its temperature drops significantly. Therefore, hot water with sufficient heat can be supplied to the dishwasher even in continuous use.

[0025] Thus, in the above-described form of booster 1, the internal circulation path 5 includes an internal forward piping 47 (an example of a forward piping) in which a circulation pump 49 is provided and hot water flows from the tank 4 to the heat source unit 3, and an internal return piping 48 (an example of a return piping) in which hot water flows from the heat source unit 3 to the tank 4. Within the tank 4, there is provided a partition wall 60 which separates the tank 4 into a front area E1 (an example of the first area) where the water inlet 40 is provided and to which the internal supply pipe 47 is connected below the water inlet 40, and a rear area E2 (an example of the second area) to which the internal return pipe 48 is connected, while allowing hot and cold water to pass back and forth. In the front region E1, there is provided a receiving member 70 which is arranged between the water inlet 40 and the full water position L and which includes a receiving surface 74 which intersects with the direction in which water poured from the water inlet 40 falls, and a guide surface 75 which is continuous with the receiving surface 74 and guides the water that falls onto the receiving surface 74 downward. According to this configuration, the receiving member 70 can weaken the force of the poured water as it enters the hot water in the tank 4. This suppresses the generation of air bubbles when pouring water into the tank 4, and prevents hot water containing air from being supplied to the heat source unit 3.

[0026] Below the receiving member 70, there is provided a second partition wall 61 which is arranged in the vertical direction, guides the water guided by the guide surface 75 below the guide surface 75, has a lower part facing the inlet of the internal supply piping 47, and has a gap S between it and the inner surface of the bottom wall portion 4a of the tank 4 (an example of the lower inner surface). According to this configuration, air bubbles contained in the hot water can be separated by passing the hot water in the tank 4 under the lower end of the second partition wall 61 before it reaches the entrance of the inner supply pipe 47. This makes it possible to more effectively prevent hot water containing air from being supplied to the heat source unit 3.

[0027] Next, a modification of the disclosed receiving member will be described. The shapes and sizes of the horizontal plate portion and the hanging plate portion of the receiving member are not limited to the above-described forms. For example, the horizontal plate portion may have larger front-to-back and left-to-right dimensions, and may be square or semicircular in plan view instead of rectangular in plan view. The mounting plate portion may be attached to the inner surface of the tank instead of the partition wall. The hanging plate portion can also be modified to match the shape of the horizontal plate portion, and may be arc-shaped in plan view or extend further downward than the above-described forms. The shape and size of the second partition wall can also be changed as appropriate. It may be arc-shaped in plan view, as long as it faces the inlet of the return pipe and can guide the hot and cold water flowing from the guide surface downward. The second partition wall can be omitted. In this case, the hanging plate portion may be extended downward so that its lower portion faces the return pipe. The receiving member is not limited to being located on the right wall of the tank, but can also be located on the left wall or front wall of the tank depending on the position of the water inlet. The same applies to the second partition wall. The receiving member does not have to be a plate, but may be box-shaped or block-shaped. The shape of the partition wall can also be changed as appropriate. The second partition wall may not be formed from the partition wall, but may be provided independently of the partition wall. In the above embodiment, an external return pipe is provided between the water inlet and the receiving member, but if the tank does not transfer heat to the dishwasher, the external return pipe may not be necessary. The present disclosure eliminates the need to provide return and discharge lines at the corners of the tank.

[0028] On the other hand, in the booster 1 of the above form, the internal circulation path 5 includes an internal forward piping 47 (an example of a forward piping) in which a circulation pump 49 is provided and hot water flows from the tank 4 to the heat source unit 3, and an internal return piping 48 (an example of a return piping) in which hot water flows from the heat source unit 3 to the tank 4. The tank 4 includes a right wall portion 4f (an example of a first vertical wall) that rises from the edge of the bottom wall portion 4a (an example of a bottom wall), and a rear wall portion 4d (an example of a second vertical wall) that is connected to the right wall portion 4f at a predetermined angle, and a drain pipe 50 for supplying hot and cold water in the tank 4 to the dishwasher is connected to the corner of the bottom wall portion 4a that is sandwiched between the right wall portion 4f and the rear wall portion 4d. The internal return pipe 48 is connected to the lower end of the right wall portion 4f at the corner. With this configuration, the right wall 4f and the rear wall 4d prevent the hot water flowing into the tank 4 from diffusing from the internal return pipe 48, and the hot water flowing from the internal return pipe 48 is led directly to the discharge pipe 50. Therefore, even when used in a continuous use dishwasher, hot water with sufficient heat can be supplied.

[0029] The discharge pipe 50 and the internal return pipe 48 are connected in the tank 4 so that their axes AL1 and AL2 intersect. Therefore, hot water flowing into the tank 4 from the internal return pipe 48 is more likely to flow directly into the discharge pipe 50. The internal return pipe 48 has a protruding pipe portion 52 that protrudes into the tank 4 beyond the inner surface of the right wall portion 4f. Therefore, the distance between the outlet of the protruding pipe portion 52 of the internal return pipe 48 and the inlet of the discharge pipe 50 becomes even closer, and the diffusion of hot water flowing from the internal return pipe 48 into the tank 4 is more effectively prevented.

[0030] Next, a modification of the disclosure relating to the arrangement of the return pipe and the discharge pipe will be described. The axes of the return pipe and the discharge pipe do not necessarily intersect at right angles. The angle at which the axes intersect does not have to be perpendicular, but may be an acute angle or an obtuse angle. The axes do not necessarily have to intersect. The protruding pipe portion may be provided on the discharge pipe instead of the return pipe, or the return pipe and the discharge pipe may each be provided with a protruding pipe portion so that the protruding pipe portions are close to each other. The protruding pipe portion does not have to be a straight pipe, but may be a curved pipe that curves toward the mating side. However, the protruding pipe portion may not be present. The return pipe is not limited to being provided on the right wall as in the above embodiment, but may also be provided on the rear wall. The corner where the discharge pipe is provided may be the rear left corner or the front left or right corner. Therefore, the return pipe may be provided on the left wall or the front wall according to the position of the discharge pipe. The corner where the return pipe and the discharge pipe are provided may not be square, but may be rounded. The tank is not limited to a rectangular shape in plan view. The tank may be a polygonal shape in plan view. In this case, the discharge pipe and the return pipe may be disposed at the corner between the adjacent first and second vertical walls. In the present disclosure, the partition wall, the second partition wall, and the receiving member may be omitted.

[0031] In addition, as is common to each disclosure, the fixing structure of the tank and the fixing structure of the heat source unit within the housing can also be changed as appropriate. For example, the tank fixing plate can be a single piece extending vertically, or the tank fixing plate can be eliminated and the tank can be fixed only to the bottom plate. The heat source unit can also be fixed by providing a heat source fixing plate between the vertical frame and the tank without providing a heat source fixing plate between the tank and the heat source unit. The structure of the housing can also be modified as appropriate. The housing does not have to be rectangular in plan view, but may be square in plan view, etc. The housing may be formed by a bottom plate, a top plate, and outer panels that close the front, back, left, and right sides, without using vertical and horizontal frames. Casters may be provided instead of legs. [Explanation of symbols]

[0032] 1··Dishwasher booster, 2··Housing, 3··Heat source unit, 4··Tank, 4a··Bottom wall, 4d··Rear wall, 4f··Right wall, 5··Internal circulation path, 6··Gas supply section, 7··Water injection section, 8··Controller, 15··Outer panel, 20··Combustion section, 21··Heat exchange section, 22··Exhaust section, 40··Water inlet, 41··Outlet, 42··Return port, 44··Exhaust port, 46··Water injection pipe, 47··Internal supply piping, 48··Internal return piping, 49··Circulation pump, 50··Discharge pipe, 52··Protruding pipe section, 60··Partition wall, 61··Second partition wall, 70··Receiving member, 71··Mounting plate section, 72··Horizontal plate section, 73··Dropping plate section, 74··Receiving surface, 75··Guiding surface, AL1, AL2··Axis, E1: Front area, E2: Rear area, ER··Right area, EL··Left area, S··Gap.

Claims

1. A heat source unit; a tank capable of storing hot and cold water up to a predetermined full water position and having a water inlet at a position higher than the full water position; an internal circulation path that includes a circulation pump and circulates the water in the tank between the tank and the heat source unit; 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, The internal circulation path includes a forward pipe in which the circulation pump is provided and through which hot water flows from the tank to the heat source unit, and a return pipe through which hot water flows from the heat source unit to the tank, A partition wall is provided in the tank to separate a first region, in which the water inlet is provided and to which the outflow pipe is connected below the water inlet, from a second region, in which the return pipe is connected, in a state that allows hot and cold water to pass back and forth, A dishwasher booster characterized in that the first region is provided with a receiving member between the water inlet and the full water position, the receiving member including a receiving surface that intersects with the direction in which water poured from the water inlet falls, and a guide surface that is continuous with the receiving surface and guides the water that falls on the receiving surface downward.

2. The booster for a dishwasher as described in claim 1, characterized in that a second partition wall is provided below the receiving member, arranged in the vertical direction, to guide the water guided by the guide surface downward below the guide surface, and whose lower part faces the inlet of the forward pipe and has a gap between it and the lower inner surface of the tank.

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