CN113243867A - Heat pump type dish washing machine and control method thereof - Google Patents

Abstract

The invention relates to a heat pump type dish washing machine and a control method thereof.A heat pump system is adopted to heat washing water, and the heat pump system comprises an evaporator, a collecting container arranged at the bottom of the evaporator and used for collecting condensed water of the evaporator, and a heating module used for raising the temperature of the environment around the evaporator. The invention can raise the temperature of the air in the environment around the evaporator, so that the evaporator can absorb more heat from the environment more quickly, thereby not only greatly improving the heat efficiency of the heat pump system, but also having simple integral structure and lower cost.

Description

Heat pump type dish washing machine and control method thereof

Technical Field

The invention belongs to the technical field of dish washing equipment, and particularly relates to a heat pump type dish washing machine and a control method thereof.

Background

The dish washer is a device for washing tableware by spraying high pressure washing water through a nozzle, and generally comprises a dish washer body forming a washing chamber, wherein a tableware inlet is arranged in front of the dish washer body, a door body is arranged at the tableware inlet, and a tableware placing rack and the like are arranged in the washing chamber.

In order to improve the washing effect of tableware, the tableware can be generally washed by using washing water with higher temperature, the existing dish washer mainly has two modes of heating the washing water, one mode is to heat the washing water by using a heating pipe, and the other mode is to provide high-temperature washing water by using a heat pump system, so that the heat pump system is favorable for reducing the consumption of energy sources and has better user experience.

In a dishwasher having a heat pump system which is mainly composed of a compressor, a condenser, a throttle device and an evaporator, heat is extracted from the environment by the evaporator, and the extracted heat is used to heat wash water or to heat dry air. The surface of the evaporator is cooler than the ambient environment to enable heat to be absorbed from the ambient environment, increasing the thermal gradient, thereby enabling heat to be transferred from the environment to the refrigerant within the evaporator. The amount of heat absorbed by the refrigerant increases as the thermal gradient increases. Since the ambient air temperature is in the range of 20 to 25 degrees celsius under domestic conditions, the heat absorption from the environment by the evaporator is limited, which also limits the heat pump efficiency and the cycle duration of the dishwasher.

Since the evaporator of the heat pump system is required to continuously absorb heat from the surrounding environment, condensed water is condensed on the evaporator and is collected in a collecting container arranged at the bottom of the evaporator. Most of the condensed water in the collecting container is discharged through the pump, the mode has higher cost, the discharge of the condensed water is inconvenient, and the complexity of the structure is increased. Meanwhile, as the moisture in the ambient air is condensed on the evaporator, the heat transfer capacity of the evaporator is reduced to a certain extent, and the heat efficiency of the heat pump system is greatly influenced.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention mainly solves the technical problem of providing a heat pump type dish washing machine which can greatly improve the heat efficiency, has simple structure and low cost, and also provides a control method of the heat pump type dish washing machine.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a heat pump type dishwasher adopts a heat pump system to heat washing water, wherein the heat pump system comprises an evaporator, a collecting container arranged at the bottom of the evaporator and used for collecting condensed water of the evaporator, and a heating module used for raising the temperature of the environment around the evaporator.

Further, the heating module is a water-absorbing and heat-releasing medium installed inside the collecting container, the water-absorbing and heat-releasing medium is in contact with the condensed water to release heat, and the heat is guided to the periphery of the evaporator.

Further, the water-absorbing and heat-releasing medium is zeolite.

Further, the collecting container is connected with a water tank for storing washing water through a water path, and the heated condensed water is conveyed into the water tank.

Further, a heating device is arranged in the collecting container and used for heating the unabsorbed condensed water in the collecting container and heating the water absorbing and heat releasing medium to regenerate the water absorbing and heat releasing medium when the water absorbing and heat releasing medium reaches a water absorbing saturation state.

Further, the collecting container is communicated with the washing cavity through a drying pipeline and is used for conveying heat generated by water absorption and heat release to the washing cavity.

Furthermore, a guide flow channel is arranged between the collecting container and the evaporator, condensed water of the evaporator enters the collecting container through the guide flow channel, the drying pipeline is communicated with the guide flow channel, and a fan is installed in the guide flow channel.

Further, a baffle for selectively opening or closing the drying pipeline is arranged at a connecting port of the drying pipeline and the guide flow channel.

Further, the guide flow channel is composed of an upper straight cylinder part and a lower bell mouth part, the straight cylinder part is arranged under the evaporator in a right alignment mode, and the bottom surface of the bell mouth part covers the upper surface of the collecting container completely.

The other technical scheme of the invention is as follows:

a method of controlling a heat pump dishwasher, comprising the steps of:

s1, starting the dishwasher, starting the heat pump system, enabling the condensed water on the evaporator to enter a collecting container, absorbing the condensed water by using a water-absorbing heat-releasing medium in the collecting container and releasing heat, and guiding the heat to the periphery of the evaporator to heat the environment around the evaporator;

s2, controlling the condensed water in the collecting container to enter the water tank through the water way to assist in heating the washing water in the water tank;

and S3, after the washing is finished, guiding the heat released by the water absorption and heat release material into the washing cavity for drying the tableware.

In summary, the heat pump dishwasher and the control method thereof according to the present invention have the following advantages compared with the prior art:

(1) according to the invention, the temperature of the air in the environment around the evaporator is raised through the heating module, so that the evaporator can absorb more heat from the environment more quickly, and the heat efficiency of the heat pump system can be greatly improved.

(2) According to the invention, the water-absorbing and heat-releasing medium is added into the collecting container, so that the condensed water is contacted with the water-absorbing and heat-releasing medium in the collecting container to release heat, and the heat is released to the environment around the evaporator, therefore, the integral structure is simple, and the cost is low.

Drawings

FIG. 1 is a schematic diagram of the dishwasher system of the present invention.

As shown in fig. 1, a housing 1, a washing chamber 2, a spraying device 3, a dish rack 4, a heat pump system 5, a water tank 6, a compressor 7, an evaporator 8, a condenser 9, a throttling element 10, a water path 11, a circulating water pump 12, a collecting container 13, a water absorbing and heat releasing medium 14, a guide flow passage 15, a straight cylinder part 15a, a bell mouth part 15b, a fan 16, a water path 17, a water pump 18, a drying pipeline 19, a drying chamber 20 and a baffle 21.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings:

the first embodiment is as follows:

as shown in fig. 1, the heat pump dishwasher provided in this embodiment heats washing water using a heat pump system, and includes a housing 1, a washing chamber 2, a spraying device 3, a dish rack 4, and a heat pump system 5, the spraying device 3 and the dish rack 4 are installed in the washing chamber 2, a door (not shown) for opening or closing the washing chamber 2 is provided at a front portion of the housing 1, and dishes to be washed are placed on the dish rack 4, and a washing and rinsing process is performed in the washing chamber. A water tank 6 is arranged at the bottom of the washing cavity 2, during washing, tap water is softened by a softener through a water inlet valve and then enters the water tank 6, washing water in the water tank 6 is heated by a heat pump system 5 and then enters the spraying device 3, and the washing water is sprayed out of the spraying device 3 to clean tableware on the tableware rack 4.

The heat pump system 5 comprises a compressor 7, an evaporator 8, a condenser 9 and a throttling element 10, refrigerant flows in a circulating pipeline consisting of the compressor 7, the condenser 9, the throttling element 10 and the evaporator 8, a water tank 6 is communicated with the condenser 9 through a water pipeline 11, and a circulating water pump 12 is installed on the water pipeline 11. The high-temperature high-pressure refrigerant from the compressor 7 enters the condenser 9, heat is released in the condenser 9, the condensed condensing medium is throttled by the throttling element 10 to form a low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant enters the evaporator 8 and absorbs heat from the surrounding environment, the refrigerant is evaporated, and the evaporated refrigerant gas flows back to the compressor 7.

The condenser 9 can be a sleeve-type condenser, a refrigerant flows in a copper pipe of the condenser 9, washing water flows on the outer layer of the sleeve, a water path 11 is communicated with the outer layer of the sleeve, the washing water enters the condenser 9 under the action of a circulating water pump 12 and exchanges heat with high-temperature refrigerant in the condenser 9 to heat the washing water, the heated washing water is sprayed out through the spraying device 3, and the flowing direction of the water and the flowing direction of the refrigerant are preferably reverse to each other in order to achieve a good heating effect. Certainly, a water storage container may be installed outside the condenser 9, the water path is communicated with the water storage container, the condenser 9 is installed in the water storage container, the washing water in the water tank 6 enters the water storage container under the action of the circulating water pump 12, and exchanges heat with the high-temperature refrigerant in the condenser 9 to heat the washing water, and the heated washing water is sprayed out through the spraying device 3, so that the flowing direction of the water and the flowing direction of the refrigerant are preferably opposite to each other to achieve a good heating effect.

When the dishwasher is working, the circulating water pump 12 is started synchronously, the washing water entering the water tank 6 is guided to the condenser 9, and exchanges heat with the refrigerant in the condenser 9 to heat the washing water.

The refrigerant in the evaporator 8 absorbs the heat of the air from the surrounding environment, at the same time, the moisture in the air can be condensed on the fins of the evaporator 8 to generate condensed water because the surface temperature of the evaporator 8 is low, a collecting container 13 is installed below the evaporator 8, the inside of the collecting container 13 is a water collecting cavity for collecting the condensed water in the evaporator 8, and the condensed water on the evaporator 8 drops due to gravity and is collected in the water collecting cavity of the collecting container 13 below the evaporator 8.

In this embodiment, the heat pump system further includes a heating module for raising the temperature of the environment around the evaporator 8, so as to raise the temperature of the air in the environment around the evaporator 8, so that the evaporator 8 can absorb more heat from the environment more quickly, and thus the heat efficiency of the heat pump system can be greatly improved.

Preferably, the heating module is a water-absorbing and heat-releasing medium 14 installed inside the collecting container 13, the water-absorbing and heat-releasing medium 14 is placed in the water collecting cavity of the collecting container 13 and is kept in contact with the condensed water collected in the collecting container 13, the water-absorbing and heat-releasing medium 14 reacts chemically with water and simultaneously releases heat, and the released heat is guided to the periphery of the evaporator 8 to raise the temperature of the air in the environment around the evaporator 8. More preferably, the water-absorbing and heat-releasing medium 14 is zeolite, and after the condensed water on the evaporator 8 drops into the collecting container 13, the condensed water and the zeolite react chemically to release heat.

For better collection of the condensate and heat conduction to the surroundings of the evaporator 8, a guide channel 15 is provided between the collecting container 13 and the evaporator 8, through which guide channel 15 the condensate condensed on the evaporator 8 enters the collecting container 13 at the bottom. At the same time, the guide flow channel 15 also facilitates guiding heat released from the chemical reaction of the zeolite with the condensed water to the surroundings of the evaporator 8.

In this embodiment, the guiding flow passage 15 is composed of an upper straight-tube portion 15a and a lower flared portion 15b, the straight-tube portion 15a is installed under the evaporator 8, and the size and shape of the straight-tube portion 15a are matched with the evaporator 8, preferably larger than the size of the evaporator 8, so as to ensure that the condensed water on the evaporator 8 completely drops into the guiding flow passage 15 and then enters the lower collecting container 13 along the guiding flow passage 15. The bottom surface of the bell-mouth portion 15b covers the upper surface of the collecting container 13 completely, and the area of the bottom surface of the bell-mouth portion 15b is preferably larger than the area of the upper surface of the collecting container 13, ensuring that the heat released from the zeolite can be collected and guided to the vicinity of the evaporator 8 above. Because the size of the straight-tube part 15a is larger than that of the evaporator 8, the released heat can be guided upwards from the side part of the evaporator 8, and the evaporator 8 can absorb more heat, so that the heat effect is further improved. The cross-sectional shapes of the straight portion 15a and the flare portion 15b may be the same or different, and may be circular, square, rectangular, or other shapes.

In order to accelerate the heat flow, a fan 16 may be arranged in the guide channel 15, which fan 16 is operated synchronously during operation of the dishwasher for accelerating the heat released by the zeolite to be conducted to the surroundings of the evaporator 8.

When the dishwasher is started to operate, condensed water condensed on the evaporator 8 starts to be collected in the collecting container 13, and when the condensed water comes into contact with the zeolite in the collecting container 13, a chemical reaction starts on the zeolite and heat is generated due to the reaction. The released heat causes the temperature of the air surrounding the evaporator 8 to increase, thereby increasing the temperature difference between the evaporator 8 and the surrounding air, which increase results in an increase in the amount of heat absorbed by the evaporator 8 from the environment and a corresponding increase in the thermal efficiency of the heat pump system.

Since the zeolite stops generating heat when it reaches water absorption saturation, in this embodiment, a heating device (not shown) is further installed at the bottom of the collection container 13 for heating the zeolite after the zeolite is used, so that the zeolite can be regenerated for the next reuse.

When the water condensed on the evaporator 8 fills the collection container 13 and the zeolite in the collection container 13 stops generating heat due to reaching a water-absorption saturated state, the heating device installed in the collection container 13 is controlled to heat to evaporate the excess condensed water remaining in the collection container 13 and the adsorbed water in the zeolite to regenerate the zeolite for reuse in a subsequent washing cycle. The heating device can adopt heating elements such as an electric heating wire, an electric heating pipe or an electric heating belt.

A water level sensor is arranged in the collecting container 13, when the water level in the collecting container 13 reaches a set value or the water level is kept unchanged within a set time, that is, the zeolite is judged to reach a water absorption saturation state, at the moment, a heating device in the collecting container 13 is controlled to be started, the heating device is used for evaporating redundant condensed water in the collecting container 13, and a guide flow passage 15 is used for guiding heat to the periphery of the evaporator 8 and simultaneously regenerating the zeolite.

This dish washer is through placing heat release medium 14 that absorbs water in collection container 13, make the comdenstion water and the heat release medium 14 that absorbs water in the collection container 13 contact and produce chemical reaction and release heat, and release the heat to the environment around evaporimeter 8 in, the air temperature in the environment around evaporimeter 8 risees, further improve the temperature difference between the refrigerant in evaporimeter 8 surrounding environment and the evaporimeter 8, make evaporimeter 8 can absorb more heat from the environment more fast, and then can promote heat pump system's thermal efficiency by a wide margin, simultaneously, because the rising of evaporimeter 8 surrounding environment temperature, also can accelerate the evaporation of evaporimeter 8 surface comdenstion water to a certain extent, reduce the time of comdenstion water at evaporimeter 8 surface condensation, also can increase the heat exchange efficiency of evaporimeter 8 to a certain extent. In addition, the heat released by the chemical reaction between the water absorbing and releasing medium 14 and water is used to heat the surrounding environment of the evaporator 8, so that the overall structure of the heat pump system is simpler and the cost is lower.

Example two:

the present embodiment is different from the first embodiment in that condensed water is chemically reacted with zeolite in the collection container 13 to release heat and heat the condensed water in the collection container 13, in the present embodiment, a water path 17 is further connected to one side of the collection container 13, the water path 17 is connected to the water tank 6 for storing washing water, a water pump 18 is installed on the water path 17, and the condensed water heated by chemical reaction with zeolite is delivered into the water tank 6 to heat the washing water and is sprayed out by the spraying device 3.

In this embodiment, the weight of the zeolite placed in the collection container 13 is configured such that the water absorption amount thereof is smaller than the maximum water collection amount of the collection container 13, ensuring that the excessive high-temperature condensed water is transferred into the water tank 6.

A water level sensor (not shown) is installed in the collection container 13, and when the water level in the collection container 13 reaches a high set value, the water pump 18 is started to deliver the high-temperature condensate water in the collection container 13 to the water tank 6. When the water level in the collection container 13 reaches the low set value, the water pump 18 is controlled to stop operating.

Example three:

the present embodiment provides a heat pump dishwasher, which differs from the first and second embodiments in that the collecting container 13 is also communicated with the washing chamber 2 through the drying pipeline 19 for transporting heat released by the zeolite water absorption into the washing chamber 2.

A drying chamber 20 is connected to a sidewall of the washing compartment 2, and after the washing process is completed, steam rising from the laundry is condensed in the drying chamber 20, and the dehumidified air is circulated between the washing compartment 2 and the drying chamber 20, so that the washed dishes are dried.

One end of the drying duct 19 communicates with the drying chamber 20, and the other end of the drying duct 19 communicates with the guide flow passage 15. In the drying procedure after the washing is finished, the fan 16 is controlled to run synchronously, and under the action of the fan 16, the heat released when the zeolite and the water are subjected to chemical reaction is guided to the drying chamber 20 through the guide flow passage 15 and the drying pipeline 19 and further flows into the washing cavity 2, so that the drying time of the tableware is shortened.

A baffle 21 for selectively opening or closing the drying duct 19 is provided at a connection port of the drying duct 19 and the guide flow passage 15, and the baffle 21 closes an inlet of the drying duct 19 during the washing mode to prevent heat from entering the washing chamber 2 from the drying duct 19. After the washing process is finished and the drying process is started, the control baffle 21 is turned upwards to open the inlet of the drying pipeline 19, and the baffle 21 guides heat into the drying pipeline 19. The flap 21 is in an open position in an inclined downward manner to help direct heat.

Example four:

a method of controlling a heat pump dishwasher, comprising the steps of:

s1, starting a dish washer, starting a heat pump system, starting a circulating water pump 12, softening tap water through a water inlet valve through a softener, then entering a water tank 6, heating washing water in the water tank 6 through the heat pump system, then entering a spraying device 3, simultaneously, starting a fan 16, dripping condensed water condensed on an evaporator 8 into a collecting container 13 below, absorbing the condensed water by a water-absorbing heat-releasing medium 14 in the collecting container 13 to generate a chemical reaction and release heat, and guiding the released heat to the periphery of the evaporator 8 through a guide flow channel 15 under the action of the fan 16 to heat the periphery of the evaporator 8, so that the temperature difference between the periphery of the evaporator 8 and a refrigerant in the evaporator 8 is improved.

And S2, when the water level in the collection container 13 reaches a high set value, starting the water pump 18 to convey the high-temperature condensed water in the collection container 13 into the water tank 6, and when the water level in the collection container 13 reaches a low set value, controlling the water pump 18 to stop working.

S3, after the washing, controlling the fan 16 to continue to operate, and guiding the heat released by the water-absorbing and heat-releasing material 14 to the washing chamber 2 through the drying pipeline 19 to assist in drying the dishes in the washing chamber 2.

Similar solutions can be derived from the solution given in the figures, as described above. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the technical solution of the present invention, unless the content is the technical solution of the present invention.

Claims (10)

1. A heat pump type dish washer adopts a heat pump system to heat washing water, the heat pump system comprises an evaporator and a collecting container which is arranged at the bottom of the evaporator and is used for collecting condensed water of the evaporator, and the heat pump type dish washer is characterized in that: a heating module for raising the ambient temperature around the evaporator is also included.

2. A heat pump dishwasher according to claim 1, characterized in that: the heating module is a water-absorbing heat-releasing medium arranged inside the collecting container, the water-absorbing heat-releasing medium is contacted with the condensed water to release heat, and the heat is guided to the periphery of the evaporator.

3. A heat pump dishwasher according to claim 1, characterized in that: the water-absorbing heat-releasing medium is zeolite.

4. A heat pump dishwasher according to claim 2 or 3, characterized in that: the collecting container is connected with a water tank for storing washing water through a water path, and the heated condensed water is conveyed into the water tank.

5. A heat pump dishwasher according to claim 2, characterized in that: and a heating device is arranged in the collecting container and used for heating the unabsorbed condensed water in the collecting container and heating the water absorbing and heat releasing medium to regenerate the water absorbing and heat releasing medium when the water absorbing and heat releasing medium reaches a water absorbing saturation state.

6. A heat pump dishwasher according to claim 2, characterized in that: the collecting container is communicated with the washing cavity through a drying pipeline and is used for conveying heat generated by water absorption and heat release to the washing cavity.

7. A heat pump dishwasher according to claim 6, characterized in that: a guide flow channel is arranged between the collecting container and the evaporator, condensed water of the evaporator enters the collecting container through the guide flow channel, the drying pipeline is communicated with the guide flow channel, and a fan is arranged in the guide flow channel.

8. A heat pump dishwasher according to claim 7, characterized in that: and a baffle plate for selectively opening or closing the drying pipeline is arranged at the connecting port of the drying pipeline and the guide flow channel.

9. A heat pump dishwasher according to claim 7, characterized in that: the guide flow channel consists of a straight cylinder part above and a bell mouth part below, the straight cylinder part is just opposite to the lower part of the evaporator, and the bottom surface of the bell mouth part completely covers the upper surface of the collecting container.

10. A method of controlling a heat pump dishwasher, comprising the steps of:

s1, starting the dishwasher, starting the heat pump system, enabling the condensed water on the evaporator to enter a collecting container, absorbing the condensed water by using a water-absorbing heat-releasing medium in the collecting container and releasing heat, and guiding the heat to the periphery of the evaporator to heat the environment around the evaporator;

s2, controlling the condensed water in the collecting container to enter the water tank through the water way to assist in heating the washing water in the water tank;

and S3, after the washing is finished, guiding the heat released by the water absorption and heat release material into the washing cavity for drying the tableware.

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