JP2005204952A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dishwasher that can exchange heat without using water tank and without enlarging the dishwasher. <P>SOLUTION: This dishwasher is provided with a heat exchanging means that exchanges heat between the draining process and the water supplying process by synchronizing the draining process of a first dishwasher 10 or a second dishwasher 102 and the water supplying process to the second dishwasher 102 or the first dishwasher 101. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dishwasher.

  A conventional dishwasher, for example, as disclosed in Patent Document 1, provided a water storage tank inside the machine body and housed a heat exchanger in the water storage tank. This water storage tank has a capacity for containing an amount of water necessary for one heating rinse. In the technique described in Patent Document 1, first, water is supplied to the cleaning tank and the water storage tank, the cleaning pump is operated to perform cleaning, the heater is energized to heat the cleaning water, and then the cleaning water is supplied to the cleaning tank. Drain from. The washing water drained from the washing tank is passed through the heat exchanger through the drainage passage and drained to the outside. At this time, heat is exchanged between the waste heat in the waste water and the water in the water storage tank to heat the water in the water storage tank. And at the time of heating rinsing, the heated water is supplied from the water storage tank into the washing tank, and the time to reach a predetermined temperature required for the heating rinsing is shortened.

JP 2002-78661 A (paragraph numbers 0016 to 0020)

  However, in the dishwasher disclosed in the above-mentioned Patent Document 1, a water storage tank having a capacity for storing water necessary for one heating rinse is installed in the body, so that the dishwasher is enlarged and the kitchen space is effectively used. It is not available for use.

  In particular, in a two-stage dishwasher that uses two dishwashers in a stack, two dishwashers must be stacked and stored in a system kitchen in a limited space. It is difficult to fit the configuration installed in the system kitchen.

  Although it is possible to configure the dishwasher without changing the size, in this case, the washing tank becomes smaller due to the space occupied by the water storage tank, and the amount of tableware that can be washed at one time is reduced. For this reason, it is necessary to wash dishes in multiple steps, and it takes longer time to finish washing and drying of all dishes, and consumes a lot of electricity and water. There is a drawback that the advantage of the dishwasher that the amount of electricity used is small is impaired.

  An object of the present invention is to solve the above-mentioned problems and to provide a dishwasher that can perform heat exchange without increasing the size of the dishwasher and without using a water storage tank.

  In order to achieve the above object, the present invention is characterized by a washing tank for storing tableware, a pump unit provided at the bottom of the washing tank for washing and draining, and water supplied into the washing tank. A dishwasher having heating means for heating the dishwasher, wherein the dishwasher includes at least a first dishwasher and a second dishwasher, and a draining step of the first dishwasher or the second dishwasher; A heat exchanging means for exchanging heat between the draining step and the water supply step in synchronization with the water supply step to the second dishwasher or the first dishwasher is provided.

  According to the present invention, it is possible to provide a dishwasher capable of performing heat exchange without increasing the size of the dishwasher and without using a water storage tank.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 8 is an external perspective view of the dishwasher according to this embodiment, and FIG. 9 is a longitudinal sectional view of the upper dishwasher.

  In FIG. 8, reference numeral 100 denotes a dishwasher unit, which is composed of a plurality (two in this embodiment) of dishwashers. Reference numeral 101 denotes a first dishwasher, and reference numeral 102 denotes a second dishwasher arranged below the first dishwasher 101. Reference numeral 103 denotes a case for storing the first dishwasher 101 and the second dishwasher 102. The first dishwasher 101 and the second dishwasher 102 stored in the case 103 are placed in the system kitchen 800. Stored. Reference numeral 104 denotes a washing tub for storing tableware provided in the first dishwasher 101. Although not shown, the second dishwasher 102 is similarly formed with a washing tub. Reference numeral 105 denotes a rail provided on the side of the first dishwasher 101, and the rail 105 allows the first dishwasher 101 to be pulled out from the dishwasher unit 100. Although not shown, a rail is also provided on the side of the second dishwasher 102 so that it can be pulled out from the dishwasher unit 100.

  Next, the structure of the dishwasher according to the present embodiment will be described with reference to FIG. FIG. 9 is a longitudinal sectional view of the first dishwasher 101.

  In FIG. 9, tableware 106 placed in a tableware basket is stored in the cleaning tank 104. A pump unit 107 that performs cleaning and drainage is disposed at the bottom of the cleaning tank 104. The pump unit 107 includes an electric motor 108 that applies a rotational force, a washing impeller 109 that is attached to the rotating shaft of the electric motor 108 and positioned above the electric motor, and is similarly attached to the rotating shaft of the electric motor 108 and below the electric motor 108. And an impeller 110 for drainage located in the area. Reference numeral 111 denotes a rotatable nozzle arm that sprays cleaning water supplied from the cleaning impeller 109 onto the tableware 106, and the nozzle arm 111 is formed with an injection port 112 for injecting cleaning water. The lower part of the central part of the nozzle arm 111 is open, and the washing impeller 109 is inserted into the open part. The upper part of the cleaning impeller 109 is bent outward in the radial direction, and the cleaning water discharged from the cleaning impeller 109 flows smoothly into the nozzle arm 111.

  A heater 113 is disposed around the pump unit 107 and serves as a heating means for heating the water supplied into the cleaning tank 104. The user directly touches the heater 113 and the nozzle arm 111. A partition plate 114 is arranged so as not to shield the heater 113. The partition plate 114 is formed of a stainless steel plate, and has a large number of holes of φ2 to φ3 mm. This hole serves as a filter so that the residue attached to the tableware 106 does not circulate in the pump unit 107.

  Next, the structure of the heater portion will be described with reference to FIGS. 6 is a perspective view of the heater unit 600, and FIG. 7 is a cross-sectional view taken along line YY of FIG.

  6 and 7, the heater 113 is arranged around the pump unit 107 as described above. Since the pump unit 107 is made of a resin molded product, the pump unit 107 may be thermally deformed when the heater 113 generates heat when the surface energy density is high, that is, when there is no water. As a countermeasure for this, a method is conceivable in which the heater 113 is die-cast with aluminum to lower the surface energy density and lower the surface temperature. However, in this case, there is a problem that aluminum is easily corroded by washing water containing a detergent. Therefore, in the present embodiment, a stainless steel cover 601 having a substantially U-shaped cross section with an open bottom surface is disposed on the outer periphery of the heater 113 to cover the heater 113. The heater unit 600 of this embodiment includes a heater 113 and a cover 601.

  Usually, the surface temperature of the heater 113 reaches about 500 to 600 ° C. When the heater 113 and the cover 601 are in contact, the heat of the heater 113 is directly transmitted to the cover 601. For this reason, a predetermined gap is provided between the heater 113 and the cover 601 as shown in FIG. Since air exists in this gap and this air has a heat insulation effect, if the gap between the heater 113 and the cover 601 is about 1 to 5 mm, the temperature rise of the cover 601 can be reduced to 215 ° C. or less.

  Further, the lowermost surface of the cover 601 is equal to the lowermost surface of the heater 113 or is positioned about 1 to 3 mm below. This is because, particularly when draining wash water containing a large amount of oil such as beef tallow, the oil adheres to the heater 113 and prevents smoke generated by heating the oil.

  Washing water that has been used to wash dishes with a large amount of oil is drained in a state where an oil that is lighter than water floats on the water. Since the washing water is drained in order from the lower part, the water level is lowered in order from the upper side of the washing tank 104, and the oil floating on the washing water is finally drained. However, when there is an object submerged in the wash water, this oil component adheres to the object as the water level decreases. Since the heater 113 heats the cleaning water, the heater 113 is submerged in the cleaning water when the pump unit 107 is stopped. For example, when there is no cover 601 that covers the heater 113, when the cleaning water is drained, oil adheres so as to cover the heater 113 as the water level decreases. When the tableware is dried, the heater 113 also plays the role of heating the air, so when the heater 113 is heated with the oil adhering to the heater 113, the oil is heated at about 500 to 600 ° C. to generate smoke and finish washing. There is a possibility that the dirt caused by smoke generation will adhere to the tableware again, or the smoke leaks to the outside. Therefore, in this embodiment, a stainless steel cover 601 is provided so as to cover the outer periphery of the heater 113, and the lowermost surface of the cover 601 is equal to the lowermost surface of the heater 113 or is positioned about 1 to 3 mm below. . When the cleaning water is drained with the cover 601 covering the outer periphery of the heater 113 as in the present embodiment, the oil component floating on the cleaning water does not adhere to the heater 113 but adheres to the cover 601. In this state, when the heater 113 is heated and the tableware drying operation is performed, it is assumed that the surface temperature of the heater 113 is about 500 to 600 ° C. due to the air insulation action by the gap between the heater 113 and the cover 601 as described above. Also, the temperature rise of the cover 601 can be suppressed to 215 ° C. or less. For this reason, even when the dish drying operation which heats the heater 113 and blows with a blower (not shown) is performed, the oil adhering to the cover 601 is not thermally decomposed and emits smoke.

  Further, as shown in FIG. 7, the cover 601 is formed with a narrowed portion 602 so as to be in line contact at a plurality of locations in order to fix the cover 601 to the heater 113 at a certain distance. In this case, since the contact is a line contact, the temperature of the cover 601 rises only in a very narrow portion, and is hardly affected.

  In this embodiment, the reason why the temperature rise of the cover 601 is suppressed to about 215 ° C. or less is different depending on the type of oil, but generally beef tallow with the largest amount of use is used as a reference, and the tallow is pyrolyzed and emits smoke. Since the temperature at the time is about 215 ° C., this temperature is not exceeded.

  In consideration of effective use of the heater, it is practically desirable to set the temperature within a range where smoke generation is allowed by heating. The setting of the temperature can be achieved by performing spatial distance and energization rate control to the heater, that is, including ON, OFF and phase control if the heater is determined.

  Next, the operation | movement operation | movement of the dishwasher which concerns on this embodiment is demonstrated using FIG.

  The dishwasher is started by placing the tableware 106 on the tableware basket, putting the detergent and pressing the start button. When the operation is started, a water supply valve, which will be described later, is opened, water is supplied into the washing tank 104, and when the predetermined amount of water is reached, the water supply valve is closed and the water supply is stopped. Next, the electric motor 108 is rotated, and the washing impeller 109 is driven by the electric motor 108. At the same time, the heater 113 is energized to heat the water in the cleaning tank 104. The cleaning water discharged from the cleaning impeller 109 flows into the nozzle arm 111, and the cleaning water is sprayed from the injection port 112 provided in the nozzle arm 111 toward the tableware 106. This cleaning step is performed until the cleaning water reaches a predetermined temperature and a predetermined time.

  When the cleaning process is completed, the electric motor 108 is rotated in the opposite direction to the cleaning process, the drain impeller 110 is driven, and the cleaning water in the cleaning tank 104 is drained outside the apparatus. Since the washing impeller 109 and the drain impeller 110 of the present embodiment are respectively provided above and below the electric motor 108 as described above, both the impellers always rotate during the washing process and the draining process. For this reason, the impeller 110 for drainage becomes a resistance particularly during the cleaning process, and the cleaning efficiency is lowered. Therefore, the blades of the impeller 110 for drainage are made to be resistant to water resistance. In this structure, since the efficiency at the time of drainage is deteriorated, in this embodiment, the rotational speed of the drainage impeller 110 at the time of the drainage process is set to be higher than the rotational speed of the cleaning impeller 109 at the time of the cleaning process. . Thereby, the pump efficiency at the time of a washing | cleaning process and a drainage process can be improved.

  When the drainage process is completed, the water supply valve is opened again to supply water into the washing tank 104 to a predetermined water level, the washing impeller 109 is driven to spray water from the nozzle arm 111 toward the tableware 106, and the tableware A first rinsing step (water rinsing step) for removing the detergent adhering to 106 is executed. When this first rinsing step is completed, the drain impeller 110 is driven to drain the water in the cleaning tank 104, and the water supply valve is opened again to supply water into the cleaning tank 104 to a predetermined water level. Perform the second rinsing step. When the water supplied into the cleaning tank 104 reaches a predetermined water level, the cleaning impeller 109 is driven to inject water from the nozzle arm 111 toward the tableware 106, and the heater 113 is energized to supply the cleaning tank 104. Heat the water inside. This second rinsing step (heating rinsing step) is performed until the rinse water reaches a predetermined temperature and a predetermined time. When the heating rinsing step is completed, the drain impeller 110 is driven to drain the heated rinse water in the cleaning tank 104.

  When the rinsing water is drained from the cleaning tank 104, a blower fan (not shown) is driven to perform the drying process. The drying process uses the remaining heat in the cleaning tank 104 heated by the heating and rinsing process, energizes the heater 113 to increase the temperature in the cleaning tank 104, and performs hot air drying for a predetermined time. Thereafter, the heater 113 is de-energized, a blowing operation for driving only the blowing fan for a predetermined time is performed for a predetermined time, and the operation is terminated.

  As described above, the dishwasher unit of the present embodiment is composed of a plurality of dishwashers. Each dishwasher can operate independently. In each step of the dishwasher, there is a step of heating and using water as in the washing step and the heating rinse step. The heated water is drained when the process is completed without recovering the heat. When the water is heated again, the water temperature supplied in the cleaning tank 104 must be heated to a predetermined temperature. Therefore, the cleaning time becomes longer and a large amount of power is consumed by energizing the heater 113. There was a drawback.

  Hereinafter, a method for recovering this heat will be described with reference to FIGS. 1 to 5, 8, and 9. FIG. 1 is a view showing a piping configuration of a heat exchanging means according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the heat exchanging means according to an embodiment of the present invention, and FIG. FIG. 4 is a longitudinal sectional view of a heat exchanging means according to another embodiment, FIG. 4 is a diagram showing steps of a dishwasher according to one embodiment of the present invention, and FIG. 5 is a dishwashing according to another embodiment of the present invention. It is a figure which shows the process of a machine.

  In FIG. 9, 200 is a heat exchange means. The heat exchange means 200 is provided on the back surface of the cleaning tank 104. As shown in FIG. 8, when the dishwasher unit 100 in which the dishwashers are stacked in two upper and lower stages is stored in the system kitchen 800, the heat exchanging means 200 is either the first dishwasher 101 or the second dishwasher 102. Provided on the back of the.

  Next, the piping configuration of the heat exchange means 200 will be described with reference to FIG. In FIG. 4, 301 is a water supply side water supply valve for supplying and shutting off tap water, 302 is a first water supply introduction pipe connected to the water supply side water supply valve 301, and 303 is a water supply for introducing water into the heat exchange means 200. The first water supply introduction pipe 302 is connected to the water supply inlet 303. 304 is a water supply outlet for discharging water from the heat exchange means 200, 305 is a second water supply introduction pipe connected to the water supply outlet 304, 306 is connected to the second water supply introduction pipe 305, and the first dishwasher A first water supply valve 307 for injecting and shutting off water into the washing tank 104 of 101, and a second water supply pipe 305 are connected to the second water supply pipe 305, and a second water feed in and out of the washing tank 104 of the second dishwasher 102 A water supply valve, 308 is a first water supply pipe connected to the first water supply valve 306, and 309 is a second water supply pipe connected to the second water supply valve. Reference numeral 310 denotes a first water supply port provided in the first dishwasher 101 and is connected to the first water supply pipe 308. Reference numeral 311 denotes a second water supply port provided in the second dishwasher 102, which is connected to the second water supply pipe 309. The water supplied to the dishwasher of the present embodiment is diverted in two directions by the first water supply valve 306 and the second water supply valve 307, and is supplied to the first dishwasher 101 and the second dishwasher 102, respectively. .

  Reference numeral 312 denotes a first drain outlet provided in the washing tank 104 of the first dishwasher 101, 313 denotes a first drain pipe connected to the first drain outlet 312, and 314 denotes a second dishwasher 102 wash A second drainage port 315 provided in the tank 104 is a second drainage pipe connected to the second drainage port 314. Reference numeral 316 denotes a third drain pipe that is connected in communication with the first drain pipe 313 and the second drain pipe 315 and passes through the heat exchange means 200. Note that the third drain pipe 316 may be a drain pipe formed integrally with the first drain pipe 313 and the second drain pipe 315.

  Next, the structure of the heat exchange means 200 will be described with reference to FIG. 2 is a cross-sectional view taken along line XX in FIG. In FIG. 2, 201 is a drainage channel formed inside the third drainage pipe 316, 202 is disposed so as to cover the outer periphery of the drainage pipe 316, and a main body case constituting the outline of the heat exchange means 200, 203 A water supply path 204 formed between the main body case 202 and the drain pipe 316 and configured to guide the water flowing from the feed water inlet pipe 303 to the water supply outlet pipe 304, and 204 connects the main body case 202 and the drain pipe 316. The heat exchange rib is arranged so as to divide the water supply passage 203 into a plurality of parts. The water supply passage 203 communicates with the first water supply valve 306 and the second water supply valve 307 via the second water supply pipe 305. The heat exchange rib 204 increases the area of heat exchange between the drainage channel 201 and the water supply channel 203 to increase heat exchange efficiency and also serves as a strength member on the water supply side. Further, the drainage channel 201 has a circular or elliptical center so that drainage containing foreign matter can easily pass therethrough. Since the water passing through the water supply passage 203 contains no foreign matter, it does not clog even if the area of each passage is small. The drainage channel 201 and the water supply channel 203 are designed to increase the heat exchange efficiency by taking the temperature difference by reversing the directions in which water flows.

  The heat exchanging means 200 may be configured as shown in FIG. FIG. 3 shows another configuration of the heat exchange means 200. In FIG. 3, 205 is a fin provided so as to protrude in the outer peripheral direction of the drain pipe 316, and 206 is a rib provided so as to protrude in the inner peripheral direction of the main body case 202. In the present embodiment, a copper drawing material having good heat conduction is used for the drain pipe 316, and a plurality of fins 205 are formed on the outer peripheral side to increase the heat exchange efficiency. A water supply channel 204 is formed between the drain pipe 316 and the main body case 202 as in the previous embodiment. A rib 206 formed integrally with the main body case 202 is provided between the plurality of fins 205, and is fixed to the main body case 202 and the drain pipe 316. The drain pipe 316 may be configured by using a resin molded product having good thermal conductivity in addition to copper. In the present embodiment, the fin 205 is provided on the outer periphery of the drain pipe 316, and the fin 205 is positioned in the water supply channel 204, so that the heat exchange efficiency is improved.

  Next, operations relating to the present embodiment will be described with reference to FIGS. 1, 2, and 4. FIG. 4 is a diagram showing the steps of the dishwasher according to one embodiment of the present invention.

  1, 2, and 4 (a), the water supply side water supply valve 301 is opened, and the first dishwasher 101 and the second dishwasher 102 are operated by the first water supply valve 306 and the second water supply valve 307. Water is supplied to the cleaning tank 104. At this time, the water supply side water supply valve 301 is controlled so that the water pressure of the water supply is not directly applied to the main body case 203 of the heat exchange means 200 by operating later than the first water supply valve 306 and the second water supply valve 307. This eliminates the need to increase the sealing strength of the main body case 203 and the mechanical strength of the main body case 203 of the heat exchange means 200.

  When the water supply to the washing tub 104 of the first dishwasher 101 and the second dishwasher 102 is completed, the process proceeds to a washing process, and the pump unit 107 is driven while water is heated by the heater 113 to wash the dishes. When the cleaning process is completed, the process proceeds to the draining process. At this time, the first dishwasher 101 and the second dishwasher 102 are not shifted to the draining process at the same time, but only one of the dishwashers is shifted to the draining process. In the present embodiment, first, the first dishwasher 101 is shifted to the draining process. The second dishwasher 102 cleaning process is continued. When the draining process of the first dishwasher 101 is completed, the water supply process of the first dishwasher 101 is executed, and the second dishwasher 102 is shifted to the draining process. The water supply process of the first dishwasher 101 and the drainage process of the second dishwasher 102 need to match the timing of water supply / drainage so that heat exchange in the heat exchange means 200 can be performed efficiently.

  The speed of operation time in the water supply process and the drainage process can be shifted to the water supply process in about several seconds due to the water pressure of the tap water in the water supply process, but in the drainage process, the pump unit 107 is driven to drain the water. It may take several tens of seconds until the wastewater reaches the heat exchanging means 200. Further, if there is an air lock when the pump unit 107 is drained, it may take more time. Therefore, in this embodiment, a means for detecting the load current or rotation speed of the motor 108 of the pump unit 107 is provided, and this detection means detects a predetermined load current or a predetermined rotation speed, and detects that drainage has started. After that, the water supply side water supply valve 301 and the first water supply valve 306 are opened to supply water. As a means for detecting the load current or the rotation speed of the electric motor 108, a well-known detection means may be used as appropriate although not shown.

  When the water supply process of the first dishwasher 101 and the drainage process of the second dishwasher 102 are performed, the hot water heated by the heater 113 passes through the drainage channel 201 of the drainage pipe 316 in the heat exchange means 200, and the drainage Tap water passes through the water supply path 203 on the outer peripheral side of the pipe 316. Since there is a temperature difference between the hot water passing through the drain pipe 316 and the tap water passing through the water supply channel 203, heat is taken from the hot water passing through the hot water drain pipe 316 by the drain pipe 316 and the heat exchange rib 204. Then, this heat is transmitted to the tap water passing through the water supply channel 203, and heat exchange is performed between the hot water (drainage) passing through the drain pipe 316 and the tap water passing through the water supply channel 203. This heat exchange is performed until predetermined water accumulates in the washing tank 104 of the first dishwasher 101.

  When predetermined water accumulates in the washing tank 104 of the first dishwasher 101, the process proceeds to the first heating and rinsing step. The water supplied to the washing tank 104 of the first dishwasher 101 becomes water having a temperature higher than the water temperature of the tap water due to the heat exchange action in the heat exchange means 200. In the first heating and rinsing step, the heater 113 is energized to heat the water, but since the water having a temperature higher than the tap water temperature is supplied into the cleaning tank 104, the water temperature necessary for the heating and rinsing step is reached. The time to do is short. For this reason, the energization time of the heater 113 is shortened, and the electricity consumption can be suppressed.

  If the 1st dishwasher 101 transfers to a heating rinse process, the 2nd dishwasher 102 will transfer to a water supply process, and will transfer to the 1st overheating rinse process after that. When the first heating rinse process of the first dishwasher 101 is completed, the process proceeds from the draining process to the water supply process. Then, in the second dishwasher 102, in accordance with the water supply process of the first dishwasher 101, the process proceeds from the first heat rinsing process to the drainage process, and similarly, warm water (drainage) and water supply passing through the drain pipe 316 Heat exchange is performed with tap water passing through the passage 203.

  Thereafter, the first dishwasher 101 proceeds to the second heating and rinsing step. However, as in the first heating and rinsing step, water having a temperature higher than the tap water temperature is supplied into the washing tub 104. The time required to reach the water temperature required for the rinsing process can be shortened, the energization time of the heater 113 can be shortened, and the electricity consumption can be suppressed.

  When the second heating and rinsing process is completed, the process proceeds to a draining process and a drying process, and a series of dishwashing / rinsing and drying processes are completed. Similarly, the second dishwasher 102 also completes a series of steps through a second heating rinse step, a draining step, and a drying step.

  In the present embodiment, the two heating rinsing steps are executed, but the heating rinsing step may be performed only once as shown in FIG. In this case, the timing of the water supply process after the washing / drainage process of the first dishwasher 101 and the drainage process after the washing process of the second dishwasher 102 are matched, and the drainage of the second dishwasher 102 and the first About performing heat exchange between the water supply to the dishwasher 101, it is the same as that of Fig.4 (a). In the rinsing process of the first dishwasher 101, water having a temperature higher than that of tap water is supplied by heat exchange. In this process, the rinsing process is executed without energizing the heater 113. In this process, tableware can be rinsed with water at a temperature higher than tap water, so in particular when cleaning tableware with a high amount of oil, reattachment of oil that could not be drained after the cleaning process was prevented, and the oil was rinsed. be able to. The first dishwasher 101 proceeds to the drainage / water supply process / heating rinse process after the rinsing process. In the heating rinse process, the heater 113 is energized to heat the water in the cleaning tank 104 to a predetermined temperature.

  On the other hand, the second dishwasher 102 executes the rinsing process while the first dishwasher 101 is executing the rinsing process, the drainage / water supply process, and the heating rinsing process. And the drainage process before completion | finish of the heating rinse process of the 1st dishwasher 101 is performed, and it prepares for a water supply process. After the heating process of the first dishwasher 101, the process proceeds to the draining process. When the pump unit 107 is driven and drainage is sufficiently performed, the water supply process of the second dishwasher 102 is executed. In the heat exchanging means 200, heat exchange is performed, and the heat of the waste water of the first dishwasher 101 is transmitted to the water supplied to the washing tank 104 of the second dishwasher 102. Then, although the 2nd dishwasher 102 transfers to a heating rinse process, since the water of temperature higher than the water temperature of tap water is supplied in the washing tank 104, the time to reach the water temperature required for the heating rinse process is short. Thus, the current consumption time of the heater 113 can be shortened to reduce the amount of electricity consumed.

  In this embodiment shown in FIG. 4 (b), the timing of the water supply / drainage process of the first dishwasher 101 and the second dishwasher 102 is matched, and the first dishwasher 101 is discharged from the drainage of the second dishwasher 102. Heat exchange is performed between the water supply and the drainage of the first dishwasher 101 to the second dishwasher 102 water supply. According to this embodiment, heat exchange can be efficiently performed between the first dishwasher 101 and the second dishwasher 102, and the time to reach the water temperature necessary for the heating rinse process is shortened. The electricity consumption can be suppressed by shortening the energization time of the heater 113.

  Further, another embodiment according to the present invention will be described with reference to FIG. In the present embodiment, a method for performing heat exchange more efficiently than in the previous embodiment will be described. In the previous embodiment, the first dishwasher 101 and the second dishwasher 102 are started to operate at the same time. However, in this embodiment, the washing process of the first dishwasher 101 is preceded, and thereafter The cleaning process of the second dishwasher 102 is started.

  In FIG. 5, the first dishwasher 101 supplies water into the washing tank 104 and cleans the dishes while heating the water by energizing the heater 113. After the cleaning process is completed, the process proceeds to the drainage process. The second dishwasher 102 executes a water supply process for cleaning at the same time as the draining process of the first dishwasher 101. In the heat exchanging means 200, heat exchange is performed, and the heat of the waste water of the first dishwasher 101 is transmitted to the water supplied to the washing tank 104 of the second dishwasher 102. After that, the second dishwasher 102 energizes the heater 113 and shifts to the washing process. However, water having a temperature higher than the water temperature of the tap water is supplied into the washing tank 104, so that the water temperature required for the washing process is reached. Reach in a short time. While the 2nd dishwasher 102 is performing the washing process, in the 1st dishwasher 101, the water supply process, the rinse process by water, and a drainage process are performed.

  Next, the first dishwasher 101 proceeds to a water supply process for heating and rinsing. The water supply process of the first dishwasher 101 and the drainage process of the second dishwasher 102 are synchronized, and the heat exchange means 200 Perform heat exchange. In the heat exchanging means 200, heat exchange is performed, and the heat of the waste water of the second dishwasher 102 is transmitted to the water supplied to the washing tank 104 of the first dishwasher 101. Thereafter, the first dishwasher 101 energizes the heater 113 and proceeds to the washing step. However, water having a temperature higher than the tap water temperature is supplied into the washing tank 104, and the water temperature required for the heating and rinsing step. Can be reached in a short time. While the 1st dishwasher 101 is performing the heating rinse process, the 2nd dishwasher 102 performs the water supply process, the rinse process by water, and a drainage process.

  Next, the second dishwasher 102 proceeds to a water supply process for heating and rinsing. The water supply process of the second dishwasher 102 and the drainage process of the first dishwasher 101 are synchronized with each other by the heat exchange means 200. Perform heat exchange. In the heat exchanging means 200, heat exchange is performed, and the heat of the waste water of the first dishwasher 101 is transmitted to the water supplied to the washing tank 104 of the second dishwasher 102. Thereafter, the second dishwasher 102 energizes the heater 113 and shifts to the washing step. However, water having a temperature higher than the tap water temperature is supplied into the washing tank 104, and the water temperature necessary for the heating and rinsing step. Can be reached in a short time. Thereafter, the first dishwasher 101 executes the drying process, and the second dishwasher 102 moves to the draining process / drying process after the heating rinse process, and the first dishwasher 101 and the second dishwasher. The series of operations 102 is finished.

  According to this embodiment, in each process of the 1st dishwasher 101 and the 2nd dishwasher 102, the waste water after the washing process and heating rinse process which heats water, and the washing process and heating rinse which heats water Since heat is exchanged with each other in synchronization with the water supply process before the process, it is possible to efficiently recover the heat without throwing away the waste water after the washing process and heating rinse process including heat. It is possible to shorten the arrival time required to heat the heater 113 and raise the water to a predetermined temperature, and to shorten the energization time of the heater 113 and to suppress the electric consumption.

  In the present embodiment, the first dishwasher 101 is operated in advance with respect to the second dishwasher 102. However, the second dishwasher 102 may be operated in advance. .

  Moreover, the part which synchronizes the waste_water | drain and water supply of the 1st dishwasher 101 and the 2nd dishwasher 102 is not limited to each embodiment mentioned above, What is necessary is just to set suitably as needed.

  Furthermore, since the heat exchange according to the present system described in each embodiment is more effective as the temperature difference between the water supply and the drainage is larger, a great effect can be expected in winter and cold regions. For this reason, when the outside air temperature is detected and the temperature difference exceeds a certain value, it can be automatically set in this step. In addition, in order to increase the heat exchange efficiency of water supply and wastewater, it is more effective to control the flow rate on the drainage side to lower the flow rate by lowering the number of rotations of the motor and the flow rate on the water supply side to increase the heat exchange time. It is.

It is a piping lineblock diagram of the heat exchange means concerning the embodiment of the present invention. The XX longitudinal cross-sectional view in FIG. 1 is shown. It is a longitudinal cross-sectional view of the heat exchange means which shows other embodiment of this invention. It is a figure which shows the process of the dishwasher which concerns on one Embodiment of this invention. It is a figure which shows the process of the dishwasher which concerns on other embodiment of this invention. It is a fragmentary perspective view of the heater part which concerns on one Embodiment of this invention. It is YY sectional drawing in FIG. 1 is an overall perspective view of a dishwasher according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the dishwasher which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... 1st dishwasher, 102 ... 2nd dishwasher, 104 ... Washing tank, 107 ... Pump unit, 200 ... Heat exchange means, 201 ... Drainage channel, 202 ... Main body case, 203 ... Water supply channel, 204 ... Heat Replacement rib.

Claims (6)

In a dishwasher having a washing tank for storing tableware, a pump unit provided at the bottom of the washing tank for washing and draining, and heating means for heating water supplied into the washing tank,
The dishwasher includes at least a first dishwasher and a second dishwasher, a draining process of the first dishwasher or the second dishwasher, and the second dishwasher or the first dishwasher. A dishwasher comprising heat exchange means for performing heat exchange between the draining step and the water supply step in synchronization with a water supply step for the machine. In a dishwasher having a washing tank for storing tableware, a pump unit provided at the bottom of the washing tank for washing and draining, and heating means for heating water supplied into the washing tank,
The dishwasher includes at least a first dishwasher and a second dishwasher. The first dishwasher and the second dishwasher are connected to the first dishwasher and the second dishwasher, respectively, through a water supply pipe and into the washing tank. A first water supply valve and a second water supply valve for inflowing and shutting off water, and a drain pipe connected to each drain side of the pump unit for draining water in the washing tank,
On the back surface of at least one of the first dishwasher and the second dishwasher, drainage from the second dishwasher or the first dishwasher and the first dishwasher or the A dishwasher comprising heat exchange means for exchanging heat with water supplied to the second dishwasher. In claim 2,
A dishwasher characterized by synchronizing a draining process in the second dishwasher or the first dishwasher and a water supply process to the first dishwasher or the second dishwasher. In claim 2 or 3,
The heat exchanging means has the drain pipe inside, a main body case that is provided so as to cover an outer periphery of the drain pipe and forms an outer shell, and the water supply pipe formed between the main body case and the drain pipe A dishwasher comprising a water supply channel communicating with the dishwasher. In claim 4,
A dishwasher characterized in that the water supply path is provided with heat exchange ribs that divide the water supply path into a plurality of parts. In claim 4 or 5,
A dishwasher characterized in that water passing through the drainage channel and the water supply channel flows in opposite directions.

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