Tableware washer booster

Abstract

To improve work efficiency by facilitating the assembling of an approach pipe, a return pipe, and a water injection pipe.SOLUTION: A heat source unit 3 and a tank 4 are arranged at positions closer to the left side of a case 2. A water injection part 7, an internal circulation passage 5, and a circulation pump 57 are arranged on the right side. All of a water outlet 85 in the water injection part 7, the other end of an elbow pipe 64B in a water inflow connection part 62, and the other end of an elbow pipe 68B in a hot water outflow connection part 66 are opened rearward. A water injection pipe 86, an approach pipe 61, and a return pipe 67 are connected to respective corresponding connection ports frontward respectively.SELECTED DRAWING: Figure 4

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 equipped with a burner and a heat exchanger that heats supplied water using the combustion exhaust from the burner, and a tank that stores the hot water heated by the heat source unit. The heat source unit is located in the front of the housing, and the tank is located behind the heat source unit, toward one side. A water supply pipe (water injection pipe) connected to an external water pipe and opened and closed by a water solenoid valve is connected to the top of the tank. A supply pipe equipped with a circulation pump and connected to the heat source unit's water inlet pipe and a return pipe connected to the heat source unit's hot water outlet pipe are connected to the bottom of the tank. When the burner in the heat source unit starts burning and the circulation pump operates, water in the tank is sent from the supply pipe to the heat exchanger via the water inlet pipe, and the hot water heated in the heat exchanger is returned to the tank via the water outlet pipe and return pipe, repeating this cycle until the hot water in the tank reaches a predetermined temperature. The heated water can then be supplied to the dishwasher via an external hot water supply pipe connected to the tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-136453 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional dishwasher booster, the supply pipe, return pipe, and water injection pipe are arranged in different directions and connected to the other pipes, so connecting the pipes during assembly takes time and effort. Also, because the water injection pipe is located behind the heat source unit, it is difficult to respond when the water solenoid valve breaks down, and maintenance work is also troublesome.

[0005] Therefore, an object of the present disclosure is to provide a booster for a dishwasher that can easily assemble the supply pipe, return pipe, and water injection pipe, thereby improving work efficiency. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides: Inside the housing, an instantaneous heating type heat source unit having a combustion section equipped with a burner, a heat exchange section equipped with a heat exchanger through which combustion exhaust gas from the burner passes, and an exhaust section that discharges the combustion exhaust gas that has passed through the heat exchange section; a tank disposed behind the heat source unit; a water injection unit that has a water electromagnetic valve that opens and closes a water supply path and can inject water into the tank through a water injection pipe; an internal circulation path including an internal supply path connected between an inlet port provided in the tank and an inlet end of a heat transfer tube of the heat exchanger, and an internal return path connected between an outlet end of the heat transfer tube and a return port provided in the tank; a circulation pump incorporated in the internal supply path; A dishwasher booster that operates the circulation pump to circulate water in the tank between the tank and the heat exchanger via the internal circulation path, heats the water in the combustion unit, and supplies the heated water to an external dishwasher, the internal supply path includes a pump connection pipe connecting the supply port and the suction port of the circulation pump, a supply pipe connected to the discharge port of the circulation pump, a water inlet pipe connected to the inlet end, and a water inlet connection portion connecting the supply pipe and the water inlet pipe, the internal return path includes an outlet pipe connected to the outlet end, a return pipe connected to the return port, and an outlet connection portion connecting the outlet pipe and the return pipe, The heat source unit and the tank are disposed at positions biased to one side in the left-right direction of the housing, and the water injection unit, the internal circulation path, and the circulation pump are disposed at the other side in the left-right direction, The connection port of the water injection pipe in the water injection section, the connection port of the supply pipe in the water inlet connection section, and the connection port of the return pipe in the water outlet connection section all open backward, and the water injection pipe, the supply pipe, and the return pipe are each connected forward to the corresponding connection port. Another aspect of the present disclosure is characterized in that, in the above configuration, the water injection section is arranged in the front part of the housing, and the water solenoid valve is provided in the front part of the water injection section. Another aspect of the present disclosure is characterized in that, in the above configuration, the water injection pipe connected to the connection port of the water injection section extends rearward, then passes in the left-right direction between the heat source unit and the supply pipe and the return pipe, extends upward so as to intersect with the supply pipe and the return pipe in a side view, and is connected to the top of the tank. Another aspect of the present disclosure is characterized in that, in the above configuration, the circulation pump is positioned with its rotation axis facing left-right, and the suction port is positioned opposite the delivery port, and the pump connection pipe is formed in a straight line extending left-right. [Effects of the Invention]

[0007] According to the present disclosure, the connection directions of the supply pipe, return pipe, and water injection pipe are aligned, making it easier to assemble each pipe and improving work efficiency. According to another aspect of the present disclosure, in addition to the above effects, the water solenoid valve is provided at the front of the water injection section, which is located at the front of the housing, so the water solenoid valve can be easily accessed from the front, making it easy to replace the water solenoid valve, etc., improving maintainability. According to another aspect of the present disclosure, in addition to the above effects, the water injection pipe extends rearward, then passes between the heat source unit and the supply pipe and return pipe in the left-right direction, and extends upward so as to intersect with the supply pipe and return pipe in a side view and is connected to the top of the tank, so that the supply pipe, return pipe, and water injection pipe can be arranged in an area close to the heat source unit, leading to a more compact left-right dimension. According to another aspect of the present disclosure, in addition to the above effects, the circulation pump is positioned with its rotation axis facing left and right and with its intake port facing the delivery port, and the pump connecting pipe is formed in a straight line extending left and right, so that the pump connecting pipe can be shortened and pressure loss and impacts caused when the circulation pump is operating can be prevented. [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. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] This is an oblique view from above the right rear, with the top panel, front, rear, left and right outer panels, and right rear vertical frame omitted. [Figure 5] In this explanatory diagram of a dishwashing system, the dishwasher booster is shown from the bottom right rear, with the top plate, front, rear, left and right outer panels, and right rear vertical frame omitted. [Figure 6] FIG. 2 is a right side view of the dishwasher booster with the right outer panel removed. 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 a first configuration, Fig. 2 is a central longitudinal cross-sectional view, and Fig. 3 is a cross-sectional view taken along line AA in Fig. 2. Fig. 4 is a perspective view showing the booster from above the right rear, with the top plate, front, rear, left and right outer panels, and right rear vertical frame omitted. 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 face (front surface).

[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] 3, 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 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 through the top plate 11. The exhaust duct 16 is L-shaped in a side view and has a horizontal duct portion 32 extending in the front-to-rear direction on the top plate 11 and a vertical duct portion 33 extending upward from the rear end of the horizontal duct portion 32. The upper end of the connecting pipe 31 protrudes into the horizontal duct portion 32, connecting the exhaust box 30 to the exhaust duct 16.

[0012] As shown in Fig. 3, 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 is supported horizontally above the bottom plate 10 by a pair of front and rear supports 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 surface of the tank 4 and the left rear vertical frame 13, and fix the tank 4 to the vertical frame 13. A heat source fixing plate 37 is attached to the front surface of the tank 4. The heat source fixing plate 37 is rectangular when viewed from the front, and an extension portion 23a extending rearward from the lower plate of the lower casing 23 of the heat source unit 3 is fixed to the lower part of the 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 lower surface 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] On the right side of the tank 4, a water inlet 40 is provided at the upper front, a supply port 41 at the lower front, and a return port 42 at the lower rear. A water inlet pipe 86 (described later) is connected to the water inlet 40, a pump connection pipe 60 (described later) is connected to the supply port 41, and a return pipe 67 (described later) is connected to the return port 42. As shown in FIG. 3 , a hot water outlet 43 for a dishwasher (hereinafter simply referred to as a “dishwasher”) is provided on the underside of the tank 4. A discharge pipe 44 is connected to the discharge pipe 43. The discharge pipe 44 penetrates the bottom plate 10, protrudes downward from the bottom plate 10, and is connected to a hot water supply pipe 103 of the dishwasher 100 (described later). An overflow pipe 45 provided in the tank 4 also protrudes from the underside of the tank 4, penetrates the bottom plate 10, and protrudes downward from the bottom plate 10. A partition wall 46 is provided inside the tank 4 to separate a front area where the water inlet 40 and the water outlet 41 are located from a rear area where the water return port 42 is located. However, a portion of the partition wall 46 is cut out, allowing hot water to pass between the front and rear areas. A boil-dry prevention float switch 47 for detecting a low water level and a tank thermistor 48 for detecting the temperature of the hot water are provided at the bottom of the rear area. At the top of the rear area, there are provided a full water float switch 49 for detecting a full water state and an overflow float switch 50 for detecting an overflow state where the water level is higher than the full water state.

[0014] The internal circulation path 5 includes an internal supply path 55, an internal return path 56, and a circulation pump 57. The internal supply path 55 connects the supply port 41 of the tank 4 to the inlet end of the heat transfer tube 29 of the heat exchanger section 21. The internal return path 56 connects the outlet end of the heat transfer tube 29 to the return port 42 of the tank 4. The circulation pump 57 is incorporated within the internal supply path 55. The circulation pump 57 is supported on the bottom plate 10 on the right side of the tank 4 and in the center of the bottom plate 10 in the front-to-rear direction, with the axis of the built-in rotary impeller extending in the left-to-right direction. The suction port 58 of the circulation pump 57 is provided on the left side, facing the supply port 41. The discharge port 59 of the circulation pump 57 is provided diagonally upward and rearward.

[0015] The internal supply path 55 includes a pump connection pipe 60 , a supply pipe 61 , a water inlet connection 62 , and a water inlet pipe 63 . The pump connecting pipe 60 is connected to the delivery port 41 of the tank 4, extends to the right, and is connected to the suction port 58 of the circulation pump 57. By connecting the opposing delivery port 41 and suction port 58 in this manner, the pump connecting pipe 60 can be made straight and installed over the shortest distance. The supply pipe 61 is connected to the discharge port 59 of the circulation pump 57 and extends upward and rearward, then turns around on the right side of the tank 4 and extends forward. The water inlet connection 62 is formed by connecting one end of a pair of left and right elbow pipes 64A, 64B together in the left-right direction, and is located on the right side of the heat source unit 3. The other end of the right elbow pipe 64B faces backward, and the supply pipe 61 is inserted and connected from behind. The other end of the left elbow pipe 64A faces upward, and the water inlet pipe 63 is inserted and connected from above. After extending upward, the water inlet pipe 63 crosses the front of the upper casing 26, wraps around to the left, and is connected to the inlet end of the heat transfer pipe 29. A water inlet thermistor (not shown) is provided in the water inlet pipe 63.

[0016] The internal return path 56 includes an outlet pipe 65 , an outlet connection 66 , and a return pipe 67 . The hot water outlet pipe 65 is connected to the outlet end of the heat transfer pipe 29 on the right side of the heat exchange section 21, and extends downward between the forward pipe 61 and the lower casing 23. The hot water outlet pipe 65 is provided with an outlet hot water thermistor (not shown). The hot water outlet connection part 66 is also formed by connecting one end of a pair of left and right elbow pipes 68A, 68B in the left-right direction, and is located on the right side of the heat source unit 3. The other end of the left elbow pipe 68A faces upward, and the hot water outlet pipe 65 is inserted and connected from above. The other end of the right elbow pipe 68B faces backward, and the return pipe 67 is inserted and connected from behind. The return pipe 67 extends rearward, passing above the circulation pump 57, and then bends to the left and is connected to the return port 42. Therefore, in the internal circulation path 5, when the circulation pump 57 operates and suction force is generated at the suction port 58, hot water in the tank 4 is sucked into the circulation pump 57 from the supply port 41 via the pump connection pipe 60 and discharged from the discharge port 59. The discharged hot water is sent from the supply pipe 61 to the water inlet pipe 63 via the water inlet connection 62 and supplied to the heat transfer pipe 29 of the heat exchanger 27. After passing through the heat transfer pipe 29, the hot water is sent from the outlet pipe 65 to the hot water outlet connection 66 to the return pipe 67 and returns to the tank 4 from the return port 42 of the tank 4. In this way, the hot water in the tank 4 circulates between the heat exchanger 27 and the tank 4 via the internal supply path 55 and the internal return path 56.

[0017] An external supply pipe 70 and an external return pipe 71 are further connected to the tank 4. The external supply pipe 70 is connected to an external supply port 72 provided on the underside of the tank 4, extends downward, penetrates the bottom plate 10, and protrudes below the bottom plate 10. The external return pipe 71 is connected to an external return port 73 provided below the water inlet 40 on the right side of the tank 4. The upper part of the external return pipe 71, which is pulled out to the right from the external return port 73, slopes upward and rearward while remaining parallel to the right side of the tank 4, forming an inclined section 74 whose upper end is located higher than the external return port 73. The middle section of the external return pipe 71 extends downward and rearward from the upper end of the inclined section 74, and then changes angle to slope downward and forward. The lower part of the external return pipe 71 extends straight down from the lower end of the middle section, penetrates the bottom plate 10, and protrudes below the bottom plate 10.

[0018] FIG. 5 shows a dishwashing system S according to a second configuration of the present disclosure. The dishwasher 100 includes a washing chamber 101 and a washing tank 102 that stores hot water (washing liquid) to be supplied to the washing chamber 101. A hot water supply pipe 103 equipped with a rinsing pump 104 is connected to the washing chamber 101. The hot water supply pipe 103 is connected to the discharge pipe 44 of the booster 1, and by operating the rinsing pump 104, the hot water in the tank 4 can be supplied to the washing chamber 101 via the hot water supply pipe 103. Washing tank 102 is provided with heat transfer section 105. Heat transfer section 105 is configured not to come into direct contact with the hot water in washing tank 102, and is formed of, for example, a straight or curved pipe with fins that penetrates washing tank 102. In this dishwashing system S, an external supply pipe 70 and an external return pipe 71 are connected to a heat transfer section 105. The lower end of the external supply pipe 70 is connected to the inlet of the heat transfer section 105 via a heat transfer supply pipe 106. The lower end of the external return pipe 71 is connected to the outlet of the heat transfer section 105 via a heat transfer return pipe 107. A heat transfer pump 108 is provided in the heat transfer return pipe 107. When the heat transfer pump 108 is activated, the hot water in the tank 4 is sent from the external supply pipe 70 through the heat transfer supply pipe 106 to the heat transfer section 105, and after passing through the heat transfer section 105, it passes through the heat transfer return pipe 107, the external return pipe 71, and then returns to the tank 4, repeating this cycle.

[0019] The gas supply unit 6 is disposed on the right side of the heat source unit 3 and forward of the circulation pump 57. The gas supply unit 6 has a gas inlet 78 that protrudes from the bottom plate 10 and extends upward. The internal gas flow path is provided with, from upstream, a main solenoid valve 79 (FIG. 6), a proportional valve 80, and a gas solenoid valve 81. An external gas pipe (not shown) is connected to the gas inlet 78. The upper part of the gas supply unit 6 is connected to a manifold 82 provided on the front surface of the lower casing 23. A gas distribution path that can supply fuel gas to each burner 24 is formed within the manifold 82. The water injection unit 7 is located in the front right corner of the housing 2, to the right of the heat source unit 3. The water injection unit 7 has a water inlet 83 that protrudes from the bottom plate 10 and extends upward. At the front of the upper end, a water solenoid valve 84 that opens and closes the internal water flow path is provided. An external water pipe (not shown) is connected to the water inlet 83. A water outlet 85 is formed facing rearward at the upper end of the water injection unit 7, and a water injection pipe 86 is inserted into the water outlet 85 from the rear. The water injection pipe 86 extends rearward to the front of the circulation pump 57, then bends diagonally upward and rearward, passes between the heat source unit 3 and the return pipe 67 and the supply pipe 61, extends to the upper right side of the tank 4 so as to intersect with both pipes in a side view, and bends to the left to be connected to the water injection port 40 of the tank 4.

[0020] Quick fasteners 87 are used to connect the pipes in the internal circulation path 5 and to connect the water injection pipe 86 to the water injection unit 7. The quick fasteners 87 are clips that resiliently engage across the ends of the pipes to be connected, allowing for easy one-touch fastening and detachment. In particular, the elbow pipe 64B of the water inlet connection 62 to which the supply pipe 61 is connected, the elbow pipe 68B of the hot water outlet connection 66 to which the return pipe 67 is connected, and the water outlet 85 of the water injection unit 7 to which the water injection pipe 86 is connected are all located close to the right side of the heat source unit 3, thereby minimizing the work area. Furthermore, because each pipe is connected from the rear, the same work is repeated. That is, as shown in FIG. 6, all connection work can be performed from the right side of the housing 2, making assembly easy and quick.

[0021] As shown in Fig. 2, 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 82. The controller 8 houses an electrical board 91 in a case 90 that is rectangular in front view and extends in the left-right direction and is open at the front. The case 90 is attached to the bottom plate 10, and is positioned by attaching an attachment piece 92 provided on the upper part to the manifold 82. A cover 93 is provided on the front side of the case 90. The upper part of the cover 93 is attached to the manifold 82 in a state where it covers the opening of the case 90 from the front. As will be described later, the electrical board 91 controls the circulation pump 57 and the water solenoid valve 84 based on the detection signals of each float switch, and supplies a predetermined amount of water into the tank 4. In addition, as will be described later, the electrical board 91 controls the combustion of the burner 24 in the heat source unit 3 based on the detected temperatures of the water inlet thermistor and the hot water outlet thermistor, and maintains the hot water in the tank 4 at a predetermined temperature (e.g., 85°C).

[0022] As shown in Fig. 3, the operation unit 17 is attached to a mounting plate 94 that is installed between the left and right vertical frames 13, 13 on the front side, and is exposed from the outer panel 15 through a window provided in the front outer panel 15. An opening / closing cover 95 is provided on the front of the operation unit 17. The operation unit 17 is provided with a power switch 96, a combustion lamp 97, and a display unit 98 on the rear side of the opening / closing cover 95, and is electrically connected to the electrical board 91. When the power switch 96 is turned ON, the operation unit 17 supplies operating power to the electrical board 91, and turns on the combustion lamp 97 when the heat source unit 3 is operating. The display unit 98 displays the operating status, error codes, etc.

[0023] In booster 1 configured as described above, when dishwashing system S installed together with dishwasher 100 is initially installed, rinsing pump 104 provided on hot water supply pipe 103 is activated. Then, hot water in tank 4 is supplied from discharge pipe 44 through hot water supply pipe 103 to washing chamber 101 of dishwasher 100 and stored in washing tank 102 below. This hot water supply continues until washing tank 102 is full. When dishwasher 100 is used to wash dishes, etc., a washing pump (not shown) sends hot water in washing tank 102 to washing chamber 101, and the hot water is circulated to wash dishes, etc. After washing, rinse pump 104 is activated to send hot water in tank 4 from discharge pipe 44 through hot water supply piping 103 to washing chamber 101, thereby performing rinsing.

[0024] Meanwhile, in the booster 1, the controller 8 monitors the water level in the tank 4. If the water level is lower than the full water float switch 49, the controller 8 opens the water solenoid valve 84 of the water injection unit 7 to inject water into the tank 4. When the water level rises to the full water float switch 49, the controller 8 closes the water solenoid valve 84 to end the water injection. Furthermore, if the water level is higher than the boil-dry prevention float switch 47, the controller 8 activates the circulation pump 57 to circulate hot water between the heat exchanger 27 of the heat source unit 3 and the tank 4 via the internal circulation path 5. 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 79 and the gas solenoid valve 81 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 section 18 to the burner 24. Thus, heat is exchanged between the hot water circulating through the internal circulation path 5 and passing through the heat transfer tube 29 and the combustion exhaust gas from the burner 24. The controller 8 controls the aperture of the proportional valve 80 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, the rotation of the fan 25, and the operation of the circulation pump 57. 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.

[0025] During times when dishwasher 100 is not performing rinsing, heat transfer pump 108 operates in response to instructions from the controller on dishwasher 100. As a result, as described above, hot water in tank 4 is sent from external supply pipe 70 to washing tank 102 via heat transfer supply pipe 106, passes through heat transfer section 105, and then returns to tank 4 via heat transfer return pipe 107 and external return pipe 71. In this way, the hot water in tank 4 circulates between it and heat transfer section 105, allowing the heat of the hot water in tank 4 to be transferred to the hot water in washing tank 102. Here, an inclined section 74 that slopes upward from the external return port 73 is provided at the top of the external return pipe 71, so even if water in the tank 4 flows into the external return pipe 71, it will not go over the inclined section 74 but will remain on the inclined section 74, preventing the water from falling down to the heat transfer return pipe 107. Therefore, at the time of initial installation, a situation will not occur in which water in the tank 4 accumulates in the heat transfer return pipe 107 downstream of the heat transfer pump 108 and interferes with the operation of the heat transfer pump 108.

[0026] If maintenance becomes necessary for the internal circulation path 5 or the like, removing the outer panel 15 on the right side of the housing 2 exposes all of the piping located to the right of the heat source unit 3 and the tank 4, as shown in Figure 6, allowing easy access to the necessary areas. In particular, in the internal circulation path 5, the supply pipe 61 and return pipe 67 are plugged in from the rear as described above, and in the water injection section 7, the water injection pipe 86 is also plugged in from the rear as described above, making it easy to replace or clean the piping. Furthermore, since the water solenoid valve 84 is located at the front of the water injection section 7, the water solenoid valve 84 located at the forefront can be easily accessed by removing the front outer panel 15. Therefore, the water solenoid valve 84 can be easily replaced, etc.

[0027] In this way, in the booster 1 and dishwashing system S of the above form, an external supply pipe 70 and an external return pipe 71 are connected to the tank 4 of the booster 1, and the external supply pipe 70 is connected to the lower part of the tank 4 and connected to the heat transfer supply pipe 106 below the tank 4, while the external return pipe 71 is connected to the tank 4 at a position below the water inlet 40 and connected to the heat transfer return pipe 107 below the tank 4, and an inclined portion 74 is formed at the upper part of the external return pipe 71, which slopes upward above the connection position to the tank 4. With this configuration, even if hot water in tank 4 is supplied to heat transfer section 105 of washing tank 102 of dishwasher 100 to transfer heat, the operation of heat transfer pump 108 provided in heat transfer return pipe 107 is not hindered.

[0028] In addition, the following modifications are possible in the disclosure regarding the external return pipe. The inclined portion of the external return pipe is not limited to a shape that slopes upward toward the rear. The inclined portion may be a shape that slopes upward toward the front or a shape that slopes upward toward the side. The inclined portion is not limited to a linear shape, and may be a curved shape. The external return pipe is not limited to being connected to the water inlet at the front right side of the tank, but may be connected to the rear right side of the tank depending on the location of the water inlet. Also, the external return pipe is not limited to being located on the right side of the tank, but may be located on the left side, front side, or rear side of the tank depending on the location of the water inlet. The shape of the middle and lower portions of the external return pipe beyond the inclined portion is not limited to the above-described form. For example, the middle and lower portions may extend linearly from the upper end of the inclined portion directly downward. The tank is not limited to a rectangular shape in plan view. The tank may be circular, oval, square, polygonal, or L-shaped in plan view. The tank does not have to be located behind the heat source unit. The heat source unit may be located on the right side of the housing instead of the left side. The heat source unit is not limited to one that uses a burner, but may also be one that uses an electric heater or one that uses a burner and an electric heater in combination.

[0029] In the booster 1 of the above form, the internal supply path 55 includes a pump connection pipe 60 connecting the supply port 41 and the suction port 58 of the circulation pump 57, a supply pipe 61 connected to the discharge port 59 of the circulation pump 57, a water inlet pipe 63 connected to the inlet end of the heat transfer pipe 29, and a water inlet connection part 62 connecting the supply pipe 61 and the water inlet pipe 63, and the internal return path 56 includes a hot water outlet pipe 65 connected to the outlet end of the heat transfer pipe 29, a return pipe 67 connected to the return port 42, and a hot water outlet connection part 66 connecting the hot water outlet pipe 65 and the return pipe 67. The heat source unit 3 and tank 4 are positioned biased to the left side of the housing 2, while the water injection section 7, internal circulation path 5, and circulation pump 57 are positioned on the right side, and the water outlet 85 (an example of a connection port for the water injection pipe 86) in the water injection section 7, the other end of the elbow pipe 64B (an example of a connection port for the supply pipe 61) in the water inlet connection section 62, and the other end of the elbow pipe 68B (an example of a connection port for the return pipe 67) in the water outlet connection section 66 all open backward, and the water injection pipe 86, the supply pipe 61, and the return pipe 67 are each connected forward to their corresponding connection ports. According to this configuration, the connection directions of the supply pipe 61, return pipe 67, and water injection pipe 86 are aligned, which makes it easier to assemble the pipes and is expected to improve work efficiency.

[0030] The water injection unit 7 is disposed at the front part inside the housing 2, and the water electromagnetic valve 84 is provided at the front part of the water injection unit 7. Therefore, by removing the outer panel 15 at the front, the water solenoid valve 84 can be easily accessed from the front, and replacement of the water solenoid valve 84 can be easily performed, improving maintainability. The water injection pipe 86 connected to the water outlet 85 of the water injection section 7 extends rearward, then passes left and right between the heat source unit 3 and the supply pipe 61 and return pipe 67, extends upward so as to intersect with the supply pipe 61 and return pipe 67 in a side view, and is connected to the top of the tank 4. Therefore, the supply pipe 61, the return pipe 67, and the water injection pipe 86 can be arranged in an area close to the heat source unit 3, which leads to a compact size in the left-right direction. The circulation pump 57 is positioned with its rotation axis facing left and right, and the suction port 58 is positioned opposite the delivery port 41, and the pump connection pipe 60 is formed in a straight line extending left and right. Therefore, the pump connection pipe 60 can be shortened, and the occurrence of pressure loss and shocks when the circulation pump 57 is operated can be prevented.

[0031] Regarding disclosure regarding the connection direction of the pipes, the following changes are possible: In the above embodiment, the supply pipe is located above the return pipe, but the positions may be reversed. The water injection pipe may cross outside the supply and return pipes. In the above embodiment, the heat source unit and tank are positioned to the left of the housing and the internal circulation path is positioned to the right, but it is also possible to position the heat source unit and tank to the right of the housing and the internal circulation path to the left. The water inlet and hot water outlet connections are not limited to being formed by two elbow pipes as in the above embodiment. The water inlet and hot water outlet connections may be formed by an integral curved pipe or a manifold. The water inlet and hot water outlet connections may also be formed integrally with the end of the water inlet pipe and the end of the hot water outlet pipe. The water solenoid valve may be provided on the side of the water inlet portion instead of the front portion. The water inlet portion does not have to be located at the front portion inside the housing. In the heat source unit, the shape of the burner in the combustion section, the shape of the heat transfer pipes in the heat exchange section, the connection positions of the water inlet pipe and the hot water outlet pipe, the shape of the exhaust section, etc. are not limited to the above-mentioned shapes and can be changed as appropriate. The tank is not limited to a rectangular shape in plan view. The tank may be circular, oval, square, polygonal, or L-shaped in plan view. The tank may not be connected to an external supply pipe or an external return pipe, and may not transfer heat to the cleaning tank.

[0032] 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 inside the tank can also be changed as needed, for example, by adding or removing partition walls, or by changing the arrangement of each pipe. 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]

[0033] 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, 15·· Outer panel, 20·· Combustion section, 21·· Heat exchange section, 22·· Exhaust section, 55·· Internal supply path, 56·· Internal return path, 57·· Circulation pump, 61·· Supply pipe, 62·· Water inlet connection section, 64A, 64B, 68A, 68B·· Elbow pipes, 63·· Water inlet pipe , 65··Outlet water pipe, 66··Outlet water connection part, 67··Return pipe, 70··External supply pipe, 71··External return pipe, 74··Sloped part, 85··Water outlet, 86··Water inlet pipe, 87··Quick fastener, 100··Dishwasher, 101··Washing room, 102··Washing tank, 103··Hot water supply piping, 105··Heat transfer part, 106··Heat transfer supply pipe, 107··Heat transfer return pipe, 108··Heat transfer pump, S··Dishwashing system.

Claims

1. Inside the housing, an instantaneous heating type heat source unit having a combustion section equipped with a burner, a heat exchange section equipped with a heat exchanger through which combustion exhaust gas from the burner passes, and an exhaust section that discharges the combustion exhaust gas that has passed through the heat exchange section; a tank disposed behind the heat source unit; a water injection unit that has a water electromagnetic valve that opens and closes a water supply path and can inject water into the tank through a water injection pipe; an internal circulation path including an internal supply path connected between an inlet port provided in the tank and an inlet end of a heat transfer tube of the heat exchanger, and an internal return path connected between an outlet end of the heat transfer tube and a return port provided in the tank; a circulation pump incorporated in the internal supply path; A dishwasher booster that operates the circulation pump to circulate water in the tank between the tank and the heat exchanger via the internal circulation path, heats the water in the combustion unit, and supplies the heated water to an external dishwasher, the internal supply path includes a pump connection pipe connecting the supply port and the suction port of the circulation pump, a supply pipe connected to the discharge port of the circulation pump, a water inlet pipe connected to the inlet end, and a water inlet connection portion connecting the supply pipe and the water inlet pipe, the internal return path includes an outlet pipe connected to the outlet end, a return pipe connected to the return port, and an outlet connection portion connecting the outlet pipe and the return pipe, The heat source unit and the tank are disposed at positions biased to one side in the left-right direction of the housing, and the water injection unit, the internal circulation path, and the circulation pump are disposed at the other side in the left-right direction, A booster for a dishwasher, characterized in that the connection port of the water inlet pipe in the water inlet section, the connection port of the supply pipe in the water inlet connection section, and the connection port of the return pipe in the water outlet connection section all open backward, and the water inlet pipe, the supply pipe, and the return pipe are each connected forward to their corresponding connection ports.

2. 2. The dishwasher booster according to claim 1, wherein the water injection section is disposed at a front portion of the housing, and the water solenoid valve is provided at the front portion of the water injection section.

3. The booster for a dishwasher as described in claim 2, characterized in that the water inlet pipe connected to the connection port of the water inlet section extends rearward, then passes in the left-right direction between the heat source unit and the supply pipe and the return pipe, extends upward so as to intersect with the supply pipe and the return pipe in a side view, and is connected to the top of the tank.

4. 4. A dishwasher booster according to claim 1, wherein the circulation pump is positioned with its rotation axis facing left and right, the suction port is positioned opposite the delivery port, and the pump connection pipe is formed in a straight line extending left and right.

Images