CN211723052U

CN211723052U - Dish washing machine

Info

Publication number: CN211723052U
Application number: CN201921715931.4U
Authority: CN
Inventors: 吴呼格吉乐图; 钟景文; 卢欣; 李亚辉
Original assignee: Ecolab USA Inc
Current assignee: Ecolab USA Inc
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-10-23
Anticipated expiration: 2029-10-14

Abstract

A dishwasher, comprising a dishwashing compartment and a spraying device for cleaning dishware arranged in the dishwashing compartment, a heating device for heating water; the dishwasher also comprises a heat recovery water tank attached to the dishwasher tank, so that the heat of the water with higher temperature in the dishwasher tank is transferred to the heat recovery water tank to preheat the water in the dishwasher tank, thereby saving energy; the dishwasher further includes a multistage centrifugal pump for pressurizing water before spraying the water through the spray heads, spraying the water at a faster speed, and reducing the number of the spray heads or reducing the hole diameters of the water outlet holes of the spray heads so that the total amount of water sprayed through the spray devices in a single cycle is constant or reduced, thereby saving water.

Description

Dish washing machine

Technical Field

The present invention relates to a dishwasher, and more particularly, to a dishwasher using a heat recovery device.

Background

Generally, a dishwasher heats water using a heating device and pressurizes the water using a centrifugal pump, and then sprays the heated and pressurized water to dishes in the dishwasher to wash them. The degree of cleanliness of the washing is an important index for identifying the dishwasher.

In view of environmental protection, people have higher requirements on the electricity-saving and water-saving performance of the dish-washing machine. The invention patent application with application number 201510137200.6 (hereinafter referred to as reference 1) proposes a heat recovery device for a dishwasher, which delivers hot water after washing dishes in the dishwasher to a heat exchange device to exchange heat with incoming household cold water before being discharged, i.e., to preheat cold water, and then to heat the preheated cold water to a desired temperature for washing dishes. Since the cold water is preheated, the energy required for heating the cold water subsequently is saved.

Fig. 1 shows the heat exchange device disclosed in reference 1. Referring to fig. 1, the heat exchange apparatus includes an outer water tank 11 and a water storage tank 12 embedded in the outer water tank 11. The outside water tank 11 and the storage tank 12 are isolated from each other and are not in fluid communication. The outside water tank 11 is used for storing unheated cold water for washing dishes, and the water storage tank 12 is used for storing hot waste water after washing dishes and preheating the cold water of the outside water tank 11. The outside water tank 11 includes a cold water inlet 1 and a hot water outlet 7, the cold water inlet 1 being connectable to, for example, a household tap to fill the outside water tank 11 with cold water; the hot water outlet 7 outputs the preheated water for washing dishes. The heat exchange device also comprises two heat exchange lines 14 communicating with the storage tank 12. The storage tank 12 and the two heat exchange pipes 14 are embedded in the outer tank 11, and can exchange heat with cold water in the outer tank 11.

The hot water which has been used for washing dishes in the inner container of the dishwasher is fed to the water storage tank 12 via the water inlet 3 and a heat exchange line 14. Since the hot water in the storage tank 12 has a high temperature and the cold water in the outer tank 11 outside the storage tank 12 has a low temperature, the hot water in the storage tank 12 preheats the cold water in the outer tank 11.

The hot water in the storage tank 12 is discharged through another heat exchange pipeline 14 and the water outlet 5 after transferring heat to the cold water in the outside tank 11. The hot water flowing through the two heat exchange lines 14 may also preheat the surrounding cold water. In fig. 1, the two heat exchange pipes 14 are curved to increase the contact area with the surrounding cold water and promote heat exchange.

Although the heat exchange device can preheat cold water for dish washing so as to save energy, water for heat exchange flowing through the two bent heat exchange pipelines 14 and the water storage tank 12 is waste water after dish washing, and food residues, oil stains and the like are carried in the waste water, and the waste water inevitably pollutes the heat exchange pipelines 14 and the water storage tank 12. In particular, in order to increase the heat exchange area, the two heat exchange pipes 14 are provided with a curved shape, which easily deposits food residues and other dirt, blocks the liquid circulation of the heat exchange pipes 14, corrodes the metal walls of the heat exchange pipes 14 and the water storage tank 12, and causes great trouble in removing such residues. In addition, the heat exchange device of reference 1 has a complicated structure, a high difficulty in manufacturing process, an increased manufacturing cost, and a high maintenance cost.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect of prior art, the inventor of the utility model provides a device that makes portably, and is with low costs, can effectively carry out heat recovery simultaneously.

According to the heat exchange device for a dishwasher of the present invention, the pipe 14 for transporting wastewater and the storage tank 12 for storing wastewater in the reference 1 are omitted. The utility model discloses a heat exchange water tank directly arranges on the case (103) that washes the dishes to with wash the dishes in the case that washes the dishes spun hot water and hot steam directly carry out the heat exchange.

The dishwasher according to an embodiment of the present invention includes: the dish washing machine comprises a dish washing box (103), a dish washing frame (101) arranged in the dish washing box, a water inlet, a water outlet and a spraying device; wherein, spray set includes: a water storage tank (106) for storing the water for washing dishes flowing from the water inlet; the heating device is used for heating the water in the water storage tank; the plurality of spray heads are arranged in the dish washing box, and water in the water storage tank can be sprayed out through the plurality of spray heads so as to wash tableware on the dish washing rack; a pressurizing device (107) for pressurizing the water in the dishwasher tank before the water is sprayed from the spray head; and a heat recovery water tank (108) attached to the dish washing tank, wherein, water flowing in through the water inlet enters the water storage cylinder (106) and flows into the heat recovery water tank (108) before, so that the heat of the hot water for washing dishes in the dish washing tank can be conducted to the heat recovery water tank to preheat the water in the heat recovery water tank.

The utility model discloses an on the other hand has adopted higher power pressure device to the higher speed will wash the dishes the water blowout, has improved the impact force of water to the tableware.

According to another embodiment of the present invention, the dishwasher is provided with a three-stage centrifuge capable of pressurizing water to 3 to 4 bar before the water is sprayed from the spray head. The increase in pressure increases the velocity and impact of the ejected water, thereby achieving the same cleaning effect with less water. Since the amount of water used for washing the dishes is reduced, the electric power consumed for heating the dish washing water is also reduced. Therefore, the embodiment achieves two beneficial effects, namely, the water consumption for washing dishes is reduced, and the energy is saved.

Drawings

FIG. 1 is a prior art heat recovery device for a dishwasher;

FIG. 2 is a perspective view of an exemplary dishwasher;

fig. 3 is a schematic exploded perspective view of a dishwasher according to an embodiment of the present invention.

Detailed Description

The following detailed description of the invention is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention.

FIG. 2 illustrates a perspective view of an exemplary door dishwasher. As shown in fig. 2, the exemplary dishwasher includes a tub 103, a rack 101 disposed in the tub 103, wherein the tub 103 includes a top plate 102 and a door 105, and dishes, etc. are placed on the rack 101 for washing.

Further, the dishwasher further includes: a water inlet (not shown), a water outlet (not shown), and a spray device; this spray set includes: a water storage tank 106 (see fig. 3), in which water flowing in through a water inlet is temporarily stored and then used for washing dishes; a heating device (not shown) for heating the water in the water storage tank 106; a pressurizing device 107 (see fig. 3), the pressurizing device 107 pressurizing the water before the water in the water storage tank 106 is ejected from the head; a plurality of spray heads (not shown) disposed about the dish rack 101. The heated and pressurized water is sprayed toward the dishes on the dish rack 101 through the spray head to wash them.

As described above, the water for washing dishes sprayed through the spray heads in the dish washing compartment 103 is hot water, generally having a temperature of 60-85 deg.C. After the dishes are washed, the hot water and the dirt washed off the dishes are discharged through the drain opening. In order to recycle the heat of the hot water in the dish washing tank 103, a heat recovery water tank 108 is added to the dishwasher according to an embodiment of the present invention, as shown in fig. 3.

Fig. 3 shows a schematic exploded perspective view of a dishwasher according to an embodiment of the present invention. Referring to fig. 3, the heat recovery water tank 108 is disposed at the top of the dish washing compartment 103 in a flat shape. The heat recovery water tank 108 is provided with a water inlet (not shown) and a water outlet (not shown) (wherein the water inlet of the heat recovery water tank 108 and the water inlet of the entire dishwasher may be the same water inlet or different water inlets connected in series, in the latter case, cool water flows first to the water inlet of the heat recovery water tank 108 through the dishwasher water inlet and then flows to the heat recovery water tank 108. it should be noted that the water outlet of the heat recovery water tank 108 is not the water outlet of the dishwasher but is arranged at the outlet of the heat recovery water tank 108. the water outlet of the heat recovery water tank 108 is communicated with the water inlet of the water storage tank 106, so that the preheated water in the heat recovery water tank 108 flows to the water inlet of the water storage tank 106 through the water outlet of the heat recovery water tank 108 and then flows into the water storage tank 106 through the water inlet of the water storage tank. The cool water for washing dishes inputted to the dishwasher is first introduced into the heat recovery water tank 108 through the water inlet of the heat recovery water tank 108 before being inputted to the water storage tank 106. Since the temperature of the hot water for washing dishes in the dish washing tank 103 is relatively high and the temperature of the water in the heat recovery water tank 108 is low, the water in the heat recovery water tank 108 naturally absorbs heat of the hot water in the dish washing tank 103, so that the water in the heat recovery water tank 108 is preheated and then flows into the water storage tub 106 from the water outlet of the heat recovery water tank 108 through a liquid pipe (not shown). Therefore, the energy required by heating the water in the water storage tank is saved, and the electric energy is saved.

In a preferred embodiment, the bottom wall of the heat recovery water tank, i.e. the wall attached to the dishwashing tank, is made of metal (e.g. aluminum) in order to increase the thermal conductivity.

In a preferred embodiment, the top panel 102 of the dishwashing compartment 103 is made of metal (e.g., aluminum) to improve thermal conductivity. The heat recovery water tank 108 is attached to the top plate 102.

In a preferred embodiment, the dishwashing compartment 103 may not have a separate top panel 102, and the top panel 102 is replaced with a heat recovery water tank 108.

In a preferred embodiment, the spraying device of the dishwashing compartment includes a spray arm disposed in the dishwashing compartment 103 and rotatable, and the plurality of spray heads are disposed on the spray arm to spray dishwashing water onto the dishes as the spray arm rotates, thereby varying different angles of spraying water toward the dishes to achieve a more sufficient washing effect.

In a preferred embodiment, the spray device comprises at least two spray arms, one spray arm being used to spray water containing detergent for cleaning. After the washing, the other spray arm is used for spraying clean water without detergent so as to wash away the detergent on the tableware (or water). That is, the water flowing out of the water storage tank 106 is divided into two branches, one branch is filled with detergent, and the other branch is not filled with detergent.

In a preferred embodiment, a valve (e.g., a solenoid valve, not shown) is provided at the outlet of the heat recovery water tank 108. Also, a temperature sensor (not shown) is provided on the heat recovery water tank 108 to detect the temperature of water in the heat recovery water tank 108. When the temperature of the water in the heat recovery water tank 108 does not reach a predetermined temperature, the valve closes the water outlet of the heat recovery water tank 108, so that the water of the heat recovery water tank 108 cannot flow out. When the temperature of the water in the heat recovery water tank 108 reaches a predetermined temperature, the valve is opened so that the water of the heat recovery water tank 108 flows out of the heat recovery water tank 108 and into the water storage tank 106, so that the cold water stays in the heat recovery water tank 108 for a sufficient time to recover sufficient heat. The predetermined temperature may be, but is not limited to, any one of 30 ℃, 35 ℃, 40 ℃, 45 ℃ and 50 ℃.

In a preferred embodiment, the dishwasher further comprises a control unit, the control unit receives the temperature signal detected by the temperature sensor and compares the temperature signal with a preset temperature value, and when the temperature signal is lower than the preset temperature value, the control unit maintains the valve in a closed state; when the temperature signal is equal to or higher than a predetermined temperature value, the control unit sends a control signal to open the valve, thereby allowing the water of the heat recovery water tank 108 to flow out of the heat recovery water tank 108.

In the embodiment described above with reference to fig. 3, the heat recovery water tank 108 is a flat plate shape, but the present invention is not limited thereto. The heat recovery water tank 108 may be of other shapes, for example, the heat recovery water tank 108 may include two portions extending horizontally and in fluid communication with one another. A horizontally extending flat plate-shaped water tank is provided on the top surface of the dishwasher tank 103, and a vertically extending flat plate-shaped water tank is provided on one side surface of the dishwasher tank 103. Thus, not only the volume of the heat recovery water tank 108 is increased, but also the area for heat exchange between the heat recovery water tank 108 and the dish washing tank 103 is increased, and the heat recovery speed is increased.

In a preferred embodiment, the heat recovery water tank 108 may include more than one vertically extending flat plate-shaped water tank, each of which is arranged to be attached to one side surface of the dish washing compartment 103, thereby further increasing a heat exchange area and further increasing a heat recovery rate.

On the other hand, a single-stage centrifugal pump is used as the above-described pressurizing device 107 (see fig. 3) in the related art to pressurize the water in the water storage tank 106. The single-stage centrifugal pump has low power, and can only increase the pressure of water to about 0.5 bar, so that the water flow sprayed out by the spray head has low speed and low impact force. The utility model discloses an embodiment adopts multistage centrifugal pump to water pressurization, has improved the pressure of water, has correspondingly improved the velocity of flow of spun water to improve the cleaning performance.

In an embodiment of the present invention, a three-stage centrifugal pump is used as the pressurizing device 107, and the water in the water storage tank 106 is pressurized before being sprayed from the spray head, so that the pressure of the water can be increased to 3 to 4 bar, and the speed of the sprayed water flow is increased. Because the speed of the water flow is improved, the impact force of the water on the tableware is higher, and the stains adhered to the tableware can be removed more easily, thereby achieving higher cleaning effect. In addition, less water can be consumed to achieve the same cleaning effect.

On the other hand, in a further embodiment, the number of spray heads is reduced or the hole diameters of the water spray holes of the spray heads are reduced for the purpose of saving water, so that the total amount of water sprayed through the plurality of spray heads per unit time (or a single cycle of washing) is maintained constant or less. Thus, the same cleaning effect can be achieved without increasing water consumption or consuming less water. In addition, under the condition of reducing the water consumption, the electric energy consumed for heating the dish washing water (for example, to 85 ℃) is also correspondingly reduced, thereby achieving the effect of saving energy.

The inventor of the utility model tests the actual energy-saving and water-saving effect of the dishwasher improved according to the embodiment of the invention and compares the actual energy-saving and water-saving effect with the existing dishwasher. In this test, the inventor modified the model ET100S dishwasher of ECOLAB company according to the embodiment of the present invention, installed the flat heat recovery water tank 108 on the top of the dish washing box 103 as shown in fig. 3, and used the three-stage centrifugal pump as the pressurizing device 107 to pressurize the water for washing dishes, increasing the pressure of the water pumped from the water storage tank 106 to 3 to 4 bar, and then spraying the water through the spray head. On the other hand, as a comparative example, the unmodified type ET100S dishwasher was also tested for water and electricity consumption. The test conditions were the same for both the modified dishwasher according to the invention and the unmodified prior art dishwasher. Table 1 below lists some experimental conditions tested on both unmodified existing dishwashers and modified dishwashers.

TABLE 1

As can be seen from the table above, under the same test condition, compared with the existing dish-washing machine, the utility model discloses dish-washing machine is owing to adopted tertiary centrifugal pump to increase the pressure of the water that washes the dishes, consequently, consumes still less water and has just reached same cleaning performance. The improved dish washer consumes 2.5 liters of water per cycle, the dish washer in the prior art which is not improved consumes 3.0 liters of water per cycle, and the water-saving effect is obvious. In addition, the heat recovery device is adopted to preheat cold water, so that the total energy consumption is reduced. Table 2 shows the relative water saving and relative energy saving of the dishwasher of the present invention with respect to the prior art dishwasher.

TABLE 2

Water saving amount	16.7％
		Electricity-saving quantity	39.2％

As can be seen from the table 2, the water saving quantity and the electricity saving quantity of the dishwasher are obviously improved.

The utility model discloses a flat heat recovery water tank 108 or similar setting that fig. 3 is shown compare in reference 1's heat exchange device, do not use two crooked heat exchange pipeline 14 and storage water tank 12 (as shown in fig. 1), and the utility model discloses a heat recovery water tank 108 is direct to carry out the heat exchange with hot water and hot steam in the case 103 that washes dishes, rather than with the waste water heat exchange that has food waste and greasy dirt. The utility model discloses a heat recovery water tank 108 has simple structure, and the preparation technology is simplified, and is with low costs to and follow-up maintenance advantage such as easy, simultaneously, also can reach apparent energy-conserving effect.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A dishwasher, comprising: the dish washing machine comprises a dish washing box (103), a dish washing frame (101) arranged in the dish washing box, a water inlet, a water outlet and a spraying device; characterized in that, the spray set includes:

a water storage tank (106) for storing the water for washing dishes flowing from the water inlet;

the heating device is used for heating the water in the water storage tank;

the plurality of spray heads are arranged in the dish washing box, and water in the water storage tank can be sprayed out through the plurality of spray heads so as to wash tableware on the dish washing rack;

a pressurizing device (107) for pressurizing the water in the dishwasher tank before the water is sprayed from the spray head; and

heat recovery water tank (108), attached it is in on the case washes the dishes, wherein, through the water that the water inlet flowed in gets into this heat recovery water tank flows into earlier before the water storage jar for a plurality of shower nozzles can conduct this heat recovery water tank at the heat of the water after the case spun that washes the dishes is heated to preheat the water in the heat recovery water tank.

2. The dishwasher of claim 1,

the heat recovery water tank (108) is flat to increase a heat exchange area with the dish washing tank, and is disposed on the top of the dish washing tank.

3. The dishwasher of claim 1,

the pressurizing means (107) is capable of pressurizing the water to 3 to 4 bar.

4. The dishwasher of claim 1,

the pressurizing device is a three-stage centrifuge.

5. The dishwasher of claim 3 or 4,

the number of the plurality of spray heads is reduced or the hole diameters of the water spray holes on the spray heads are reduced, so that the total water output sprayed from the plurality of spray heads in unit time is unchanged or reduced under the condition that the pressure of the pressurizing device (107) is increased.

6. The dishwasher of claim 1,

the bottom wall of the lower portion of the heat recovery water tank, which is in contact with the dish washing case, is made of a metal material to promote heat conduction.

7. The dishwasher of claim 2,

the bottom wall of the heat recovery water tank serves as a ceiling of the dish washing case.

8. The dishwasher of claim 1, further comprising:

the temperature sensor is arranged on the heat recovery water tank (108) and used for detecting the temperature of water in the heat recovery water tank (108);

the electromagnetic valve is arranged at the water outlet of the heat recovery water tank (108);

the control unit receives the temperature signal detected by the temperature sensor, compares the temperature signal with a preset temperature value, and maintains the electromagnetic valve in a closed state when the temperature signal is lower than the preset temperature value; when the temperature signal is equal to or higher than a predetermined temperature value, the control unit sends a control signal to open the electromagnetic valve, so that the water in the heat recovery water tank (108) flows out of the heat recovery water tank (108).