JP7126707B2 - Hot water generation hot water storage device for dishwasher - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for generating and storing hot water for rinsing a dishwasher.

Commercial dishwashers use hot water of about 80° C. or higher when rinsing dishes. This is because high-temperature water is used to sterilize tableware, and heating the tableware to a high temperature promotes drying of the tableware.

At present, methods for generating and storing hot water of 80° C. or higher in commercial dishwashers are roughly classified into two methods. One is a method of heating water through a heat exchanger with a combustion gas burner, and the other is a method of inserting an electric heater in a hot water storage tank to heat water. The former has sufficient heating capacity alone, while the latter has insufficient heating capacity, and in many cases medium-temperature hot water is supplementarily supplied from a gas water heater in order to shorten the time.

Patent Document 1 describes a hot water generating and storing device for a dishwasher that heats water with a heat pump to generate hot water and stores the hot water in a hot water storage tank. By adopting the heat pump type, the running cost can be reduced compared to the gas type, and higher efficiency can be achieved compared to the electric heater type.

JP-A-10-80391

However, in the conventional heat pump type hot water generation and storage device, hot water is constantly generated and supplied to the dishwasher during the washing operation of the dishwasher. The compressor and the hot water storage tank had to be large. As a result, the running cost is still high and the installation space is large.

In view of the above-mentioned problems, the hot water generation and storage device for a dishwasher of the present invention has a washing execution mode for washing dishes and a washing pause mode for pausing the washing of dishes after washing the dishes until the next washing of the dishes. A hot water generation hot water storage device for a dishwasher configured to alternately repeat a heat pump unit configured, a hot water storage tank for storing hot water for rinsing generated by heat exchange between the refrigerant flowing in the condenser and water supplied from the outside, and a water supply from the hot water storage tank to the dishwasher. a supply control valve for controlling supply of hot water for rinsing, opening the supply control valve to supply hot water for rinsing while the dishwasher is in the washing execution mode, and supplying hot water for rinsing while the dishwasher is in the washing pause mode. a control means for controlling the supply control valve to close the supply control valve and stop the supply of hot water for rinsing;
By performing the heat source operation of the heat pump unit during both the cleaning execution mode and the cleaning pause mode, a required amount of hot water for rinsing is generated in the cleaning execution mode and stored in the hot water storage tank to perform the cleaning. Assuming that the required amount of hot water for rinsing is supplied to the dishwasher during the period of the mode, and the washing execution mode and the washing pause mode are regarded as one cycle, the amount of hot water for rinsing supplied and the amount of hot water generated for each cycle are is balanced to keep the remaining amount of hot water for rinsing in the hot water storage tank above a certain value.

According to the hot water generation and storage device for a dishwasher of the present invention, the dishwasher is provided with a washing execution mode and a washing pause mode, and during the period in which the dishwasher is in the washing pause mode, the hot water for rinsing is continuously generated for rinsing. By stopping the supply of hot water, the remaining amount of hot water in the hot water storage tank is kept above a certain value, so the compressor and hot water storage tank that make up the heat pump are made smaller, reducing running costs and saving space. can be realized.

1 is a diagram showing the configuration of a hot water generating and storing device for a dishwasher according to a first embodiment of the present invention; FIG. FIG. 4 is a diagram illustrating an operation example of the hot water generating and storing device of the dishwasher according to the first and second embodiments of the present invention; 1 is a diagram showing the arrangement of hot water generating and storing devices of dishwashers according to first and second embodiments of the present invention; FIG. FIG. 4 is a diagram showing another arrangement of the hot water generating and storing device of the dishwasher according to the first and second embodiments of the present invention; FIG. 5 is a diagram showing the configuration of a hot water generation and storage device for a dishwasher according to a second embodiment of the present invention;

<First embodiment>
A hot water generating and storing device for a dishwasher according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, this hot water generating and storing device 100 is a device for generating and storing hot water for rinsing a dishwasher, and includes a heat pump unit 10 and a hot water storage tank unit 20 .

First, the configuration of the heat pump unit 10 will be described. In this heat pump unit 10, a compressor 1 (compressor), a condenser 2 (condenser), an electromagnetic expansion valve 3 and an evaporator 4 (evaporator) are circulated and connected by a refrigerant pipe 5, and a refrigerant in the refrigerant pipe 5 is For example, it is configured by enclosing carbon dioxide (CO ₂ ) in a flowable manner. The evaporator 4 and the compressor 1 are connected via an accumulator 6 (accumulator).

Further, the refrigerant pipe 5 on the outlet side of the evaporator 4 and the refrigerant pipe 5 on the outlet side of the condenser 2 are connected in parallel by brazing or the like to form an auxiliary heat exchange section 7, and the evaporator 4 By heating the low-temperature refrigerant that has passed through the condenser 2 with the high-temperature refrigerant discharged from the condenser 2, the heat utilization efficiency can be enhanced.

Next, the configuration of the hot water storage tank unit 20 will be described. This hot water storage tank 21 is formed of a semi-sealed container. The hot water storage tank 21 stores hot water for rinsing generated by heat exchange between the refrigerant flowing in the condenser 2, which is a water heat exchanger, and water (eg, city water) supplied from the outside.

Between the hot water storage tank 21 and the condenser 2, there is a first water pipe 22a for flowing water from the lower outlet side of the hot water storage tank 21 to the inlet side of the condenser 2, and from the outlet side of the condenser 2 to the hot water storage tank 21. A second water pipe 22 b is arranged to return heated water to the upper inlet side, and a circulation path is formed between the hot water storage tank 21 and the condenser 2 . A solenoid valve 56 is provided in the water pipe 22b.

The first water pipe 22a on the inlet side of the condenser 2 is provided with a heat exchange inlet temperature sensor S1 for detecting the inlet water temperature. A heat exchange outlet temperature sensor S2 for detecting the water temperature at the outlet is provided on the second water pipe 22b on the outlet side of the condenser 2. As shown in FIG.

The first water pipe 22a is provided with a flow rate control pump 23 for circulating water while controlling the flow rate. At the end of the pipe branched from the second water pipe 22b on the upper inlet side of the hot water storage tank 21, a relief valve 24 is provided for releasing high-temperature and high-pressure hot water to the outside and lowering the overpressure in the hot water storage tank 21. there is A water supply pipe 25 for supplying water to the hot water tank 21 is connected to the lower inlet of the hot water tank 21 . The water supply pipe 25 is provided with a pressure reducing valve 25a with a check valve, which moderately lowers the water pressure and prevents backflow.

A hot water supply pipe 26 for supplying hot water for rinsing to the dishwasher 30 is connected to the upper outlet of the hot water storage tank 21 . An electric mixing valve 27 is provided in the middle of the hot water supply pipe 26 . The electric mixing valve 27 mixes the water flowing through the branch pipe 28 branched from the water supply pipe 25 and the hot water for rinsing flowing through the hot water supply pipe 26 as necessary, and controls the temperature of the hot water for rinsing.

A supply control valve 29 is provided in the hot water supply pipe 26 between the electric mixing valve 27 and the dishwasher 30 . A hot water supply temperature sensor S3 for detecting the temperature of the hot water supplied is provided in the hot water supply pipe 26 (the portion between the electric mixing valve 27 and the supply control valve 29).

This supply control valve 29 controls the supply of hot water for rinsing from the hot water storage tank 21 to the dishwasher 30 . The control means 40 controls opening and closing of the electric mixing valve 27 and the supply control valve 29 . Further, the control means 40 performs temperature control through control of the electric mixing valve 27 and the like based on temperature detection signals from the heat exchange inlet temperature sensor S1, the heat exchange outlet temperature sensor S2, and the hot water supply temperature sensor S3. Furthermore, the control means 40 controls the flow rate of the flow control pump 23 .

The dishwasher 30 is configured to alternately repeat the washing execution mode and the washing pause mode. The washing execution mode is a mode in which the dishwasher 30 executes dishwashing, and the washing pause mode is a mode in which the dishwasher 30 pauses dishwashing.

In response to a mode signal from the dishwasher 30, the control means 40 opens the supply control valve 29 to supply hot water for rinsing while the dishwasher 30 is in the washing execution mode. The dishwasher 30 cleans the dishes and rinses the dishes with warm water for rinsing.

Further, the opening and closing of the supply control valve 29 is controlled so that the supply control valve 29 is closed to stop the supply of hot water for rinsing while the dishwasher 30 is in the washing pause mode.

In this case, while the heat pump unit 10 is in heat source operation, the hot water generation/storage device 100 supplies the required amount (for example, 2 liters) of rinsing water to the washing execution mode during both the washing execution mode and the washing pause mode. Hot water is generated and stored in the hot water storage tank 21, and the necessary amount of hot water for rinsing is supplied to the dishwasher 30 during the washing execution mode.

That is, while the dishwasher 30 continues to generate hot water for rinsing even during the period of the washing pause mode, the supply of hot water for rinsing is stopped, so that the remaining amount of hot water in the hot water storage tank 21 is maintained at a certain value or more. I have to. As a result, the size of the compressor 1 and the hot water storage tank 21 constituting the heat pump unit 10 can be reduced, thereby reducing running costs and saving space.

Next, an operation example of the hot water generation and storage device 100 described above will be described with reference to FIG. The dishwasher 30 alternately repeats the washing execution mode and the washing pause mode, and each period of the washing execution mode and the washing pause mode is set to 1 minute. Also, the flow rate of warm water for rinsing required for the washing execution mode is assumed to be 2 liters/minute, and in this case, the number of dishes to be washed by the dishwasher 30 is assumed to be 16 dishes/minute. In addition, the flow rate of hot water for rinsing generated in a state where the heat pump unit 10 is operating as a heat source is assumed to be 1 liter/minute.

As shown in FIG. 2, it is assumed that the compressor 1 is temporarily stopped for reasons such as defrosting, and is actually restarted after a normal restart time of 3 minutes, and the heat pump unit 10 starts the heat source operation. During this restart time, the heat pump unit 10 stops operating as a heat source. Also, during this period, the solenoid valve 56 is closed and the water in the hot water storage tank 21 does not move.

Assuming that the initial remaining amount of the hot water storage tank 21 is 7 liters, the supply control valve 29 is opened during the two washing execution modes within the restart time, and 2 liters of water is supplied from the hot water storage tank 2 to the dishwasher 30 at a time. be. Therefore, the remaining amount of the hot water storage tank 21 is reduced to 3 liters when the restart time elapses.

When the compressor 1 is actually restarted and the heat pump unit 10 starts operating as a heat source, the solenoid valve 56 is opened and the flow rate control pump 23 is operated to allow water to flow from the hot water storage tank 21 to the condenser 2. . Then, water is heated by heat exchange with the condenser 2 to generate hot water for rinsing, which is stored in the hot water storage tank 21 .

Therefore, hot water for rinsing is generated at a flow rate of 1 liter/minute and stored in the hot water storage tank 21 during both the cleaning execution mode and the cleaning suspension mode. On the other hand, during the washing execution mode, hot water for rinsing is supplied to the dishwasher 30 at a flow rate of 2 liters/minute. In this way, if the washing execution mode and the washing suspension mode are set as one cycle, the supply (consumption) and production of hot water for rinsing are balanced in each cycle.

Therefore, since only 1 liter of hot water is generated and stored during each cleaning pause mode period, the remaining amount of hot water storage tank 21 recovers from 3 liters to 4 liters. Also, 2 liters is supplied to the dishwasher 30 during each washing execution mode, but 1 liter of hot water is generated and stored during this period as well, so the remaining amount in the hot water storage tank 21 is only reduced to 3 liters. be. As a result, the remaining amount of the hot water storage tank 21 is always kept at 3 liters or more. Therefore, the capacity of the hot water storage tank is sufficient, for example, 10 liters.

In this case, if the number of dishes to be washed in the washing execution mode of the dishwasher 30 is 16/minute, the number of dishes to be washed per hour is 16×60×1/2=480/hour.

In each cycle, even if the supply amount (consumption amount) and the production amount of hot water for rinsing do not completely match, the remaining amount of the hot water storage tank 21 should be controlled so as to be maintained at a certain value or more. Just do it. Also, the period of the cleaning execution mode and the period of the cleaning pause mode may not be the same. Further, in the washing execution mode, the dishwasher 30 may be configured to repeatedly perform dish washing and rinsing using a detergent, and intermittently pour warm water for rinsing onto the dishes.

In the hot water generation and storage device 100 described above, the compressor 1, the condenser 2, the expansion valve 3, and the evaporator 4 are normally configured in an integrated arrangement, but other suitable arrangements are shown in FIGS. I will explain based on. In the arrangement example of FIG. 3, the compressor 1 is separated from the main body of the hot water generation and storage device 100 and arranged outside the room partitioned by a wall 70 (for example, an outer wall). The dishwasher 30, the condenser 2, the expansion valve 3, the evaporator 4, the hot water storage tank 21, etc. are arranged indoors. As shown in FIG. 1, the compressor 1 is connected via refrigerant pipes 5 to the condenser 2, evaporator 4, etc. of the heat pump unit 10 arranged indoors.

4, the compressor 1 and the evaporator 4 are separated and arranged outside the room partitioned by the wall 70, and the dishwasher 30, the condenser 2, the hot water storage tank 21, etc. are arranged indoors. ing. As shown in FIG. 1, the compressor 1 and the evaporator 4 are connected via refrigerant pipes 5 to the condenser 2, expansion valve 3, etc. of the heat pump unit 10 arranged indoors. Although not shown, the evaporator 4 is separated and arranged outside the room partitioned by the wall 70, and the dishwasher 30, the compressor 1, the condenser 2, the expansion valve 3, and the hot water storage tank 21 are arranged indoors. can also

In this manner, the compressor 1 or evaporator 4, which is a source of noise and requires a large installation space, is placed outdoors, and the other components of the hot water generating and storing apparatus 100 are placed indoors, thereby reducing indoor noise. In addition, space saving in the room can be realized. Although the compressor 1, the condenser 2, the expansion valve 3, and the evaporator 4 are not illustrated in order to obtain the above effect, it is also possible to separate them in other manners.

<Second embodiment>
Next, a hot water generating and storing device for a dishwasher according to a second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 5, this hot water generating and storing device 200 is a device for generating and storing hot water for rinsing a dishwasher, and includes a heat pump unit 10 and a hot water storage tank unit 20A.

Since the heat pump unit 10 is the same as that of the first embodiment, the configuration of the hot water storage tank unit 20A will be described. The hot water storage tank 51 is formed of an open container. The hot water storage tank 51 stores hot water for rinsing generated by heat exchange between the refrigerant flowing in the condenser 2, which is a water heat exchanger, and the water (for example, city water) supplied from the outside.

A water supply pipe 52 for supplying water to the condenser 2 is connected to the inlet side of the condenser 2 . The water supply pipe 52 is provided with a pressure reducing valve 53 with a check valve and a constant flow valve 54 for controlling the water flow rate to be constant. A hot water outflow pipe 55 is connected to the outlet side of the condenser 2 so that hot water for rinsing generated by heat exchange flows out to the upper open portion of the hot water storage tank 51 . A solenoid valve 56 is provided near the exit of the hot water outflow pipe 55 .

The water supply pipe 52 on the inlet side of the condenser 2 is provided with a heat exchange inlet temperature sensor S1 for detecting the inlet water temperature. A hot water outflow pipe 55 on the outlet side of the condenser 2 is provided with a heat exchange outlet temperature sensor S2 for detecting the water temperature at the outlet.

A hot water supply pipe 57 for supplying hot water for rinsing to the dishwasher 30 is connected to the lower outlet of the hot water storage tank 51 . A flow control pump 58 and an electric mixing valve 59 are provided in the middle of the hot water supply pipe 57 . The electric mixing valve 59 mixes the water flowing through the branch pipe 60 branched from the water supply pipe 52 and the hot water for rinsing flowing through the hot water supply pipe 57 as necessary, and controls the temperature of the hot water for rinsing.

A supply control valve 61 is provided in the hot water supply pipe 57 between the electric mixing valve 59 and the dishwasher 30 . A hot water supply temperature sensor S3 for detecting the temperature of the hot water supplied is provided in the hot water supply pipe 57 (the portion between the electric mixing valve 59 and the supply control valve 61).

This supply control valve 61 controls the supply of hot water for rinsing from the hot water storage tank 51 to the dishwasher 30 . The control means 40 controls opening and closing of the electric mixing valve 59 and the supply control valve 61 . Further, the control means 40 controls the temperature of the hot water for rinsing through the control of the electric mixing valve 59 or the like based on the temperature detection signals from the heat exchange inlet temperature sensor S1, the heat exchange outlet temperature sensor S2 and the supplied hot water temperature sensor S3. . Furthermore, the control means 40 controls the flow rate of the flow control pump 58 .

Other configurations are the same as those of the first embodiment, and the dishwasher 30 is configured to alternately repeat the washing execution mode and the washing pause mode. In response to a mode signal from the dishwasher 30, the control means 40 opens the supply control valve 61 to supply hot water for rinsing while the dishwasher 30 is in the washing execution mode, and the dishwasher 30 pauses washing. During the mode period, the opening/closing of the supply control valve 61 is controlled so that the supply control valve 61 is closed to stop the supply of hot water for rinsing.

Further, the operation example of the hot water generation and storage device 200 according to this embodiment is the same as that of the first embodiment.

3 and 4, the hot water generation and storage device 200 according to the present embodiment also includes a dishwasher 30, a condenser 2, an expansion valve 3, a hot water storage tank 51, etc., and a compressor. 1 or the evaporator 4 can be separated and arranged outside the room, in addition to reducing noise in the room, space can be saved in the room.

In addition to the above-described embodiments, the present invention includes various changes, modifications, and improvements based on the knowledge of those skilled in the art, as long as they do not depart from the spirit of the present invention. etc. can be added.

1 Compressor 2 Condenser 3 Expansion valve 4 Evaporator 4a First evaporator 4b Second evaporator 5 Refrigerant pipe 6 Accumulator 7 Auxiliary heat exchange unit 10 Heat pump unit 20 Hot water tank unit 21 Hot water tank 22a First water pipe 22b Second water pipe 23 Flow control pump 24 Relief valve 25 Water supply pipe 25a Pressure reducing valve with check valve 26 Hot water supply pipe 27 Electric mixing valve 28 Branch pipe 29 Supply control valve 30 Dishwasher 51 Hot water storage tank 52 Water supply Pipe 53 Pressure reducing valve with check valve 54 Constant flow valve 55 Hot water outflow pipe 56 Solenoid valve 57 Hot water supply pipe 58 Flow control pump 59 Electric mixing valve 60 Branch pipe 61 Supply control valve 70 Wall S1 Heat exchange inlet temperature sensor S2 Heat exchange outlet Temperature sensor S3 Supply hot water temperature sensor

Claims (4)

do the dishes cleaning run mode andStop washing dishes after washing the dishes and before washing the next dish.A hot water generation and storage device for a dishwasher configured to alternately repeat a wash pause mode,
a heat pump unit configured by circulatingly connecting a compressor, a condenser, an expansion valve, and an evaporator with refrigerant pipes and circulating the refrigerant through the refrigerant pipes;
a hot water storage tank for storing hot water for rinsing generated by heat exchange between the refrigerant flowing through the condenser and water supplied from the outside;
a supply control valve for controlling supply of hot water for rinsing from the hot water storage tank to the dishwasher;
The supply control valve is opened to supply hot water for rinsing while the dishwasher is in the washing execution mode, and the supply control valve is closed to supply hot water for rinsing while the dishwasher is in the washing pause mode. and a control means for controlling the supply control valve to stop
By performing the heat source operation of the heat pump unit during both the cleaning execution mode and the cleaning pause mode, a required amount of hot water for rinsing is generated in the cleaning execution mode and stored in the hot water storage tank to perform the cleaning. supplying the required amount of hot water for rinsing to the dishwasher during the mode;
Assuming that the washing execution mode and the washing pause mode are one cycle, by balancing the supply amount and the generated amount of hot water for rinsing in each cycle, A hot water generating and storing device for a dishwasher, characterized in that the remaining amount of hot water for rinsing in the hot water storing tank is maintained at a predetermined value or more. The hot water storage tank and the dishwasher are arranged indoors,
2. The hot water generating and storing device for a dishwasher according to claim 1 , wherein said compressor or said evaporator is arranged outdoors. 3. The hot water generating and storing device for a dishwasher according to claim 1, wherein said compressor is arranged outdoors, and said condenser, said expansion valve and said evaporator are arranged indoors. 3. The hot water generating and storing device for a dishwasher according to claim 1, wherein said compressor and said evaporator are arranged outdoors, and said condenser and said expansion valve are arranged indoors.

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