CN117652989A - Drainage device of dish washing machine and control method of dish washing machine - Google Patents

Abstract

The invention discloses a drainage device of a dish washer and a control method of the dish washer, wherein the drainage device comprises: a water tank; a drainage pump communicated with the water tank; the siphon drain pipe is communicated with the drain pump and provided with an ascending section which is arranged in an upward extending mode and a descending section which is communicated with the ascending section and extends downwards, and the cross section area of the ascending section is smaller than that of the descending section; the inlet end of the main drain pipe is communicated with the drain pump, and the outlet end of the main drain pipe is communicated to the descending section of the siphon drain pipe; the inlet end of the siphon drain pipe is higher than the outlet end of the siphon drain pipe for outward drainage, and the siphon drain is performed after the drain pump stops working. In the invention, the main drain pipe and the siphon drain pipe can drain simultaneously, drain water flow is collected into the descending section of the siphon drain pipe with larger cross section area to drain, which is beneficial to improving drainage efficiency, residual water in the water tank is pumped out by utilizing siphon effect after the drain pump is closed, and the problem of residual water in the water tank of the dish washer can be avoided under the condition of saving drainage time.

Description

Drainage device of dish washing machine and control method of dish washing machine

Technical Field

The invention belongs to the technical field of dish washers, and particularly relates to a drainage device of a dish washer and a control method of the dish washer.

Background

Most of the prior art dish washing machines drain water by a drain pump after washing is completed. However, due to the operating characteristics of the drain pump, the washing water is often not completely drained, resulting in a small amount of residual water remaining at the bottom of the tub of the dishwasher after the drain is completed. The residual water is stored for a long time in the dish washer, bacteria are easy to breed, and then secondary pollution is caused to the tableware when the tableware is washed, so that the health of a user is influenced. The long-term accumulation of residual water also generates peculiar smell, so that a user has a pungent and unpleasant smell when opening the dish-washing machine, and the use experience of the user is seriously affected.

At present, aiming at the problem of residual water in a water tank, the following two solutions are mainly adopted. The first scheme is to evaporate residual water by using a hot drying method, so as to achieve the purpose of removing residual water. However, the heating module needs to be installed, so that the cost is increased, and meanwhile, the energy consumption of the heating module is high during working, which is unfavorable for saving energy. On the other hand, the drying can only evaporate water, which may lead to residue in residual water left at the bottom of the water tank after drying, and the heating module has certain fire safety hidden trouble.

The second solution is to drain the residual water by venturi. However, the structure required for this scheme is complicated, and there is also a problem of high cost. Meanwhile, the inner diameter of the venturi tube is smaller, and food residues possibly exist in residual water, so that hidden danger of blocking the venturi tube exists, and the residual water draining function cannot be realized, so that the scheme is lower in reliability.

In view of this, the present invention has been made.

Disclosure of Invention

The invention aims to solve the technical problems of overcoming the defects of the prior art, and provides a water draining device of a dish washer and a control method of the dish washer, which can realize quick outward water draining of the dish washer and simultaneously prevent the problem of residual water in a water tank after water draining by utilizing a siphon effect.

In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:

a drain device of a dish washer, comprising:

a water tank;

a drain pump communicated with the water tank;

the siphon drain pipe is communicated with the drain pump and provided with an ascending section which is arranged in an upward extending mode and a descending section which is communicated with the ascending section and extends downwards, and the cross section area of the ascending section is smaller than that of the descending section;

the inlet end of the main drain pipe is communicated with the drain pump, and the outlet end of the main drain pipe is communicated to the descending section of the siphon drain pipe;

the inlet end of the siphon drain pipe is higher than the outlet end of the siphon drain pipe for outward drainage, and the siphon drain is performed after the drain pump stops working.

Further, the cross-sectional area of the main drain pipe is larger than the cross-sectional area of the rising section of the siphon drain pipe;

preferably, the cross-sectional area of the main drain pipe is equal to or less than the cross-sectional area of the descending section of the siphon drain pipe.

Further, the siphon drain pipe also comprises a bending section, wherein the bending section is arranged between the ascending section and the descending section, one end of the bending section is connected with the upper end of the ascending section, and the other end of the bending section is connected with the upper end of the descending section; the highest position of the bending section is higher than the upper end of the descending section, and the cross section area of the bending section is equal to the cross section area of the ascending section;

the main drain pipe is provided with a vertical extension section which extends upwards, and the outlet end of the main drain pipe is connected to the upper end of the descending section of the siphon drain pipe or a region close to the upper end of the descending section.

Further, the tail end of the vertical extension section is connected with a connecting section which is bent downwards, and the connecting section is connected with a descending section of the siphon drain pipe; the highest position of the connecting section is higher than the highest position of the bending section in the siphon drain pipe.

Further, a first stop valve is arranged on the main drain pipe and used for controlling the on-off of the main drain pipe; the second stop valve is arranged on the siphon drain pipe and used for controlling the on-off of the siphon drain pipe, and the second stop valve is arranged between the inlet end of the siphon drain pipe and the upper end of the descending section;

preferably, the inlet end of the main drain pipe extends along the horizontal direction to form a horizontal extension section, the vertical extension section of the main drain pipe is connected with the extension tail end of the horizontal extension section, and the first stop valve is arranged on the horizontal extension section;

and/or the siphon drain pipe is provided with a horizontal section which is horizontally extended, the extending tail end of the horizontal section extends upwards to form a rising section, and the second stop valve is arranged on the horizontal section of the siphon drain pipe.

Further, the siphon water draining pipe further comprises a flow detection device, wherein the flow detection device is arranged between the inlet end of the siphon water draining pipe and the upper end of the descending section;

preferably, the flow detection device is arranged between a second stop valve on the siphon drain and the lower end of the rising section.

A control method of a dishwasher, the dishwasher including the above-mentioned drain device of the dishwasher, the control method comprising:

starting a drainage pump, wherein water in the water tank enters the main drainage pipe and the siphon drainage pipe, and is collected to the descending section of the siphon drainage pipe to be discharged outwards;

cutting off the main drain pipe when the first set condition is reached;

closing the draining pump and performing siphon draining through the siphon draining pipe.

Further, the first set condition is that the water level in the water tank or the drainage pump is reduced to a set water level, and the set water level is higher than the inlet end of the siphon drainage pipe.

Further, after closing the drain pump to perform siphon drainage, the method further comprises: when the second set condition is reached, cutting off the siphon drain pipe;

the second setting condition is: the water level in the drain pump reaches zero and/or no water flow is detected before the drop section of the siphon drain, or a set period of time after the drain pump is turned off.

Further, during the washing process of the dish washer, the main drain pipe and the siphon drain pipe are both kept in a cut-off state.

By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects.

In the invention, when the dish washer controls the drain pump to be opened, the drain water flow can enter the main drain pipe and the siphon drain pipe simultaneously and is converged to the descending section of the siphon drain pipe to be discharged outwards. The cross section area of the descending section of the siphon drain pipe is larger than that of the ascending section, so that higher drainage efficiency during the opening period of the drain pump is ensured. After the drainage pump is closed, the siphon drainage pipe can be utilized to realize siphon drainage, so that residual water in the water tank is pumped out by the siphon drainage pipe under the siphon effect. The ascending section cross section area of the siphon drain pipe is smaller, the siphon effect can be ensured, the water flow backflow after the siphon is finished is reduced or even avoided, the residual water in the water tank is ensured to be discharged, and the problem that the residual water in the water tank causes secondary pollution to tableware is avoided.

In the invention, the cross section area of the main drain pipe is larger than that of the rising section of the siphon drain pipe, and higher drainage efficiency can be realized in the running state of the drain pump. The siphon drain pipe is provided with the bending section and is used for connecting the ascending section and the descending section, so that smooth transition is realized between the ascending section and the descending section, and the resistance of water flow steering in the siphon drain process is reduced. The bending section and the rising section of the siphon drain pipe have the same cross-sectional area, namely the siphon drain pipe has smaller cross-sectional area before beginning to extend downwards, so that the water quantity which possibly flows backwards at the end of siphon is further reduced.

According to the invention, by arranging the first stop valve and the second stop valve, the main drain pipe and the siphon drain pipe can be controlled to be in a cut-off state in the washing process, so that dry burning faults caused by discharging washing water due to the siphon effect are avoided. Meanwhile, the first stop valve can be used for controlling the main drain pipe to be cut off, and then controlling the drain pump to be closed, so that the state that the siphon drain pipe is filled with the drain water flow is not affected, and the siphon drain can be smoothly realized. The second stop valve cuts off the siphon drain pipe before the descending section, can also avoid the drainage rivers to flow back to the condition in drain pump or the basin when the drainage is close to accomplishing, ensures to fully discharge residual water.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

fig. 1 is a schematic view showing a structure of a dishwasher in accordance with a first embodiment of the present invention;

FIG. 2 is a flowchart showing a first control method of a dishwasher in accordance with an embodiment of the present invention;

FIG. 3 is a flowchart showing a second control method of the dishwasher in accordance with the first embodiment of the present invention;

FIG. 4 is a flowchart of a third control method of a dishwasher in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view showing a structure of a dishwasher in accordance with a second embodiment of the present invention;

fig. 6 is a flowchart of a control method of a dishwasher in accordance with a second embodiment of the present invention.

In the figure: 100. a main drain pipe; 101. a first stop valve; 140. a vertically extending section; 150. a horizontal extension; 160. a connection section; 200. a siphon drain; 201. a second shut-off valve; 202. a flow sensor; 220. bending sections; 230. a rising section; 240. a descent section; 250. a drainage end section; 260. a horizontal section; 300. a water tank; 400. a draining pump; 500. an inner container; 600. ground surface.

It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 and 5, the drain device of a dishwasher in accordance with the present invention includes:

a water tank 300;

a drain pump 400 in communication with the sump 300;

a siphon drain pipe 200, which is communicated with the drain pump 400, and has an ascending section 230 extending upward, and a descending section 240 communicating with the ascending section 230 and extending downward, wherein the cross-sectional area of the ascending section 230 is smaller than that of the descending section 240;

the main drain pipe 100 has an inlet end communicating with the drain pump 400 and an outlet end communicating with the drop section 240 of the siphon drain pipe 200.

The siphon drain pipe 200 has an inlet end higher than an outlet end for draining water outwards, and performs siphon drainage after the drain pump 400 stops operating.

In the above-described scheme, since the inlet end of the siphon drain pipe 200 is higher than the outlet end, when the siphon drain pipe 200 is filled with the drain water flow, a siphon effect is generated, so that the water in the water tank 300 is sufficiently pumped out under the siphon effect. In this way, the occurrence of the condition that residual water exists in the water tub 300, which may cause secondary pollution to the tableware washed later, can be avoided.

The drain pump 400 can drive water in the water tank 300 to enter the main drain pipe 100 and the siphon drain pipe 200 simultaneously when in operation, and the drain water flow finally gathers to the descending section 240 of the siphon drain pipe 200 to be discharged outwards, and the descending section 240 has a larger cross-sectional area compared with the ascending section 230, so that higher drain efficiency can be realized during operation of the drain pump 400, and drain time can be saved. The smaller cross-sectional area of the rising section 230 is beneficial to ensuring the siphon effect and ensuring that the residual water in the water tank 300 can be sufficiently discharged during the siphon drainage process. The rising section 230 and the falling section 240 of the siphon drain 200 have different cross-sectional areas, and can achieve both efficient drainage and sufficient drainage of residual water.

As a preferred embodiment of the present invention, a first shut-off valve 101 is provided on the main drain pipe 100 for controlling the on-off of the main drain pipe 100; the siphon drain pipe 200 is provided with a second stop valve 201 for controlling the on-off of the siphon drain pipe 200, and the second stop valve 201 is disposed between the inlet end of the siphon drain pipe 200 and the upper end of the descending section 240.

In the above-mentioned scheme, the first stop valve 101 and the second stop valve 201 can cut off the main drain pipe 100 and the siphon drain pipe 200 when the dishwasher performs washing, thereby preventing the problem of pumping the washing water out due to the siphon effect. When the siphon drainage is completed, the siphon drainage pipe 200 can be cut off through the second stop valve 201, so that the backflow of drainage water in the siphon drainage pipe into the water tank 300 is avoided, and no residual water in the water tank 300 is ensured.

Example 1

As shown in fig. 1, the present embodiment provides a dishwasher including a tub 500 for accommodating dishes to be washed, and a drain for controlling drain of washing water in the tub 500, and a drain thereof.

In this embodiment, the drain device of the dishwasher includes a sump 300 and a drain pump 400. The water tank 300 is disposed on the bottom wall of the inner container 500, and a groove structure is formed on the bottom wall of the inner container 500, and the washing water in the inner container 500 can be collected into the water tank 300 under the action of self gravity. The drain pump 400 communicates with the sump 300 for providing a driving force to drain the water in the sump 300.

The drain apparatus further includes a main drain pipe 100 and a siphon drain pipe 200. Wherein an inlet end of the siphon drain pipe 200 communicates with the drain pump 400, and an outlet end is for draining the water outwards. The inlet end of the main drain pipe 100 is connected to the drain pump 400, and the outlet end is connected between the inlet end and the outlet end of the siphon drain pipe 200.

Specifically, the siphon drain 200 is an integral pipe, an opening is provided between an inlet end and an outlet end thereof, and an outlet end of the main drain 100 is connected to the opening, thereby forming a three-way structure at a junction of the siphon drain 200 and the main drain 100.

In this embodiment, the drain device of the dishwasher can realize siphon drainage. Specifically, the siphon drain 200 has an upwardly extending upper section 230, and a downwardly extending lower section 240 in communication with the upper section 230. The inlet end of the siphon drain pipe 200 is higher than the outlet end of the siphon drain pipe which drains outward, so that when the siphon drain pipe 200 is filled with the drain water flow, the drain pump 400 can stop operating, and the siphon drain pipe 200 can perform siphon drainage to continue draining the remaining water in the sump 300.

In the above-described aspect, the descent section 240 of the siphon drain 200 is extended downward to be inserted below the ground 600, so that the outlet end of the siphon drain 200 is located below the ground 600 to drain the water outward. The siphon drain 200 has an ascending section 230 and a descending section 240 that are connected to each other, thereby forming a siphon structure in which the height of the water outlet is lower than that of the water inlet, and the upward and downward directions are sequentially performed.

The siphon structure can utilize siphon effect to make the liquid in the high-position container flow upwards along the siphon firstly, then flow into the container in lower position, namely realize the effect that the liquid flows from high liquid level to higher liquid level and then flows back to lower liquid level. The siphon effect is generated by the attraction and potential energy difference between liquid molecules.

In particular, when two containers that can hold liquid are placed at different levels, the high-position container has a higher liquid level than the low-position container. The pipe orifice at the higher end of the siphon pipe is immersed below the liquid level of the high-position container, and the siphon pipe is filled with liquid, at the moment, the pipe orifices at the two ends of the siphon pipe are subjected to equal atmospheric pressure, but the difference between the hydraulic pressure and the air pressure is larger due to the fact that the liquid level is higher at the pipe orifice at the higher end of the siphon pipe, larger pressure is generated at the water surface of the pipe orifice at the higher end of the siphon pipe, water in the siphon pipe flows from the end with larger pressure to the end with smaller pressure, and then the liquid in the high-position container is gradually sucked into the low-position container along the siphon pipe.

In this embodiment, the water draining device of the dishwasher is formed with a siphon structure, when the dishwasher drains water, the drain pump 400 is controlled to be turned on, and water in the water tank 300 can enter the main drain pipe 100 and the siphon drain pipe 200 respectively and be collected into the descending section 240 of the siphon drain pipe 200 to be discharged outwards. When the siphon drain 200 is completely filled with the drain water flow, the main drain 100 is shut off, and the drain pump 400 is turned off, so that the remaining water in the sump 300 continues to be discharged outwardly along the siphon drain 200 under the siphon effect. By adopting the siphon drainage mode, the water in the water tank 300 can be more thoroughly pumped out, and the situation that residual water exists in the water tank 300 after the drainage is finished is avoided.

Compared with the scheme of removing residual water by using a heating mode in the prior art, the scheme does not need to set extra energy, and is beneficial to saving the energy consumption of the dish washer. The drainage device is simple in structure, low in probability of being blocked and being incapable of draining residual water, and further higher in reliability. Meanwhile, the structure of the drainage device is simplified, the cost is reduced, the maintenance is more convenient, and the user experience is better.

In a further version of this embodiment, the cross-sectional area of the ascending section 230 is smaller than the cross-sectional area of the descending section 240 of the siphon drain 200. Specifically, when the siphon drain 200 is a round tube, the cross-sectional diameter of the ascending section 230 is smaller than the cross-sectional diameter of the descending section 240.

Since the main drain pipe 100 and the rising section 230 of the siphon drain pipe 200 simultaneously convey the drain water flow during the operation of the drain pump 400, the falling section 240 of the siphon drain pipe 200 has a larger cross-sectional area to facilitate the passage of a larger drain flow rate, and thus a higher drain efficiency is more easily achieved during the operation of the drain pump 400, so that a length required for drainage can be saved.

And the siphon effect is utilized to drain, when the drainage is nearly completed, air can be introduced when one end of the siphon sucking liquid is separated from the liquid level, the siphon effect can be destroyed, and the liquid flowing upwards at the front section of the siphon can flow backwards. If the pipe diameter of the siphon pipe is too large, the problem that residual water cannot be completely discharged due to the large water quantity of the backflow exists. Meanwhile, the larger the pipe diameter of the siphon tube, the larger the gravity force to which the filled liquid is subjected, and thus the larger the pressure required to maintain the siphon tube in a filled state. When the outer liquid level of one end of the siphon pump liquid is lowered to be close to the bottom surface of the container, the condition that air enters the container to destroy the siphon effect is more likely to occur.

The ascending section 230 of the siphon drain 200 in this embodiment has a smaller cross-sectional area, which is beneficial to keep the siphon drain 200 full of the drain water flow during the siphon drain process, and avoid the siphon effect from being destroyed before the drain is completed. Meanwhile, the cross-sectional area of the rising section 230 is smaller, and thus the amount of water that can be contained therein is smaller, even if the siphon effect is broken due to the entering of the rising section 230 into the air after the residual water in the water tank 300 completely enters the siphon drain pipe 200, and thus the backflow of the drain water occurs, the residual water in the water tank 300 does not occur because the amount of water flowing back is small.

The drop section 240 of the siphon drain 200, although of a larger cross-sectional area, generally does not disrupt the siphon effect by air entering the drop section 240 due to the downward flow of water therein under the force of gravity. And even when the water in the water tank 300 is completely drawn out and thus air is introduced into the siphon discharge pipe 200, the water flow in the drop section 240 is discharged downward by gravity without flowing back into the water tank 300.

In a further version of this embodiment, the cross-sectional area of the main drain pipe 100 is greater than the cross-sectional area of the rising section 230 of the siphon drain pipe 200. When the main drain pipe 100 is also circular, i.e., the cross-sectional diameter of the main drain pipe 100 is greater than the cross-sectional diameter of the riser section 230.

Preferably, the cross-sectional area of the main drain pipe 100 is equal to or less than the cross-sectional area of the drop leg 240 of the siphon drain pipe 200, and more preferably, the cross-sectional areas of both are uniform. That is, the cross-sectional diameter of the main drain pipe 100 is equal to the cross-sectional diameter of the drop leg 240 of the siphon drain pipe 200.

In the drain device of the dishwasher according to the present embodiment, the main drain pipe 100 plays a main role in draining during the operation of the drain pump 400, most of the washing water is collected into the descending section 240 of the siphon drain pipe 200 by the main drain pipe 100, and only a small portion of the drain water flow directly enters the siphon drain pipe 200 to be drained. When a small amount of washing water remains in the sump 300, the drain pump 400 is turned off again, siphon drainage is achieved by the siphon drain pipe 200, and the remaining washing water of the sump 300 is sufficiently drawn out, preventing the remaining water from being present in the sump 300.

The dishwasher of the present embodiment starts the drain pump 400 at the drain stage, and simultaneously delivers the drain water flow using the main drain pipe 100 and the siphon drain pipe 200. To ensure that the cross-sectional area of the siphon effect is small at the later stage, the rising section 230 of the siphon drain 200 provides the main drain 100 with a larger cross-sectional area, and thus greater drainage efficiency through the main drain 100 can be achieved.

In a further aspect of this embodiment, the siphon drain 200 further includes a bending section 220, wherein the bending section 220 is disposed between the rising section 230 and the falling section 240, and one end of the bending section 220 is connected to the upper end of the rising section 230 and the other end of the bending section is connected to the upper end of the falling section 240. The uppermost position of the bending section 220 is higher than the upper end of the falling section 240, and the cross-sectional area of the bending section 220 is equal to the cross-sectional area of the rising section 230. Specifically, the cross-sectional diameter of the bending section 220 is equal to the cross-sectional diameter of the rising section 230.

The main drain pipe 100 has a vertically extending section 140 extending upward, and an outlet end of the main drain pipe 100 is connected to an upper end of a descending section 240 of the siphon drain pipe 200 or a region near the upper end of the descending section 240.

Further, the end of the vertical extension 140 is connected to a connection 160 bent downward, and the connection 160 is connected to a descent 240 of the siphon drain 200. The highest position of the connection section 160 is higher than the highest position of the bending section 220 in the siphon drain 200.

In the above-described scheme, the outlet end of the main drain pipe 100 is connected to the highest position downstream of the siphon drain pipe 200, and is connected to the siphon drain pipe 200 by being bent downward by the connection section 160. In this way, after the drain pump 400 is turned off, even if the water flows back in the vertical extension 140 of the main drain pipe 100 by the force, the siphon drain pipe 200 is not affected from the state of being filled with the water flow due to the partial downward extension of the connection of the main drain pipe 100 and the siphon drain pipe 200. In this manner, the siphon drain 200 may remain full, thereby ensuring that a siphon effect may be created to thoroughly drain the water from the sump 300.

In this embodiment, the control method of the dishwasher includes:

starting the drainage pump 400, enabling water in the water tank 300 to enter the main drainage pipe 100 and the siphon drainage pipe 200, and discharging the water outwards from the descending section 240 converged to the siphon drainage pipe 200;

when the first setting condition is reached, cutting off the main drain pipe 100;

the drain pump 400 is turned off, and the siphon drain is performed through the siphon drain pipe 200.

In the above scheme, the main drain pipe 100 is cut off first in the draining process of the dish washer, and then the drain pump 400 is closed to perform siphon drainage, so that the water in the main drain pipe 100 can be prevented from flowing backwards to the water tank 300 when the drain pump 400 is closed, the state that the siphon drain pipe 200 is full of water is destroyed, and further the siphon effect can be formed after the drain pump 400 is closed to continue to drain outwards.

To realize the control of the on-off of the main drain pipe 100, the drain device of the dishwasher in this embodiment further includes a first shut-off valve 101 provided on the main drain pipe 100. The dishwasher can control the on-off of the main drain pipe 100 by controlling the open/close state of the first shut-off valve 101.

Before the start of the drainage, the first shutoff valve 101 is controlled to be opened to turn on the main drain pipe 100. Then, the drain pump 400 is turned on, and the water in the water tank 300 can enter the main drain pipe 100 under the driving action of the drain pump 400 and then enter the descending section 240 of the siphon drain pipe 200 along the main drain pipe 100 to be discharged outwards. When the first setting condition is reached, the first shut-off valve 101 is controlled to be closed, thereby shutting off the main drain pipe 100, and then the drain pump 400 is closed, so that siphon drainage along the siphon drain pipe 200 can be achieved.

In a further aspect of this embodiment, the first setting condition is that the water level in the sump 300 or the drain pump 400 is lowered to a set water level, which is higher than the inlet end of the siphon drain pipe 200.

In the present embodiment, the water level sensor is provided in the sump 300 or the drain pump 400, and the water level sensor may be provided in both the sump 300 and the drain pump 400. The dishwasher presets a set water level for controlling siphon drainage, and when the water level detected by the water level sensor drops to the set water level, the first shut-off valve 101 is closed to shut off the main drain pipe 100, and then the drain pump 400 is closed to perform siphon drainage.

The set water level is higher than the inlet end of the siphon drain pipe 200, so as to avoid sucking air in the siphon drain pipe 200 before starting siphon drain, and further, the residual water in the water tank 300 can not be discharged by siphon effect after the drain pump 400 is closed.

The control method of the dish washer according to the embodiment further includes: after the drain pump 400 is turned off to perform siphon drain, the siphon drain pipe 200 is shut off when the second set condition is reached. In this way, on one hand, the air can be prevented from entering the siphon drain pipe 200, when the siphon effect is destroyed, a small amount of water in the siphon drain pipe 200 flows back into the water tank 300, and on the other hand, when the dishwasher runs again to wash dishes by water entering the inner container 500, the siphon drain pipe 200 is in a cut-off state, so that the problem that the washing water in the inner container 500 is pumped out by the siphon drain pipe 200 due to the siphon effect in the process of washing the dishes is avoided.

Specifically, in this embodiment, when the second set condition is reached, that is, the residual water in the water tank 300 is drained, the siphon drainage process may be ended.

In order to control the on-off of the siphon drain pipe 200, the drain apparatus further comprises a second stop valve 201 disposed on the siphon drain pipe 200. The dishwasher can control the on-off of the siphon drain 200 by controlling the open/close state of the second shut-off valve 201.

Specifically, the second shut-off valve 201 is disposed between the inlet end of the siphon drain 200 and the upper end of the drop leg 240, i.e., upstream of the drop leg 240. In this case, the first shut-off valve 101 is used to control the on-off of the main drain pipe 100, and the second shut-off valve 201 is used to control the on-off of the area upstream of the siphon drain pipe 200 with respect to the descending section 240. While the descending section 240 communicates with both the main drain pipe 100 and the upstream region thereof, so that the first shutoff valve 101 and the second shutoff valve 201 are in parallel control relationship.

In this embodiment, before the drainage is started, the first stop valve 101 and the second stop valve 201 are controlled to be opened, so that the main drain pipe 100 and the siphon drain pipe 200 are respectively turned on. Then the drain pump 400 is turned on, and the water in the water tank 300 can simultaneously enter the main drain pipe 100 and the siphon drain pipe 200 under the driving action of the drain pump 400, thereby realizing outward drainage. When the first set condition is reached, the first stop valve 101 is controlled to close and cut off the main drain pipe 100, and then the drain pump 400 is closed, so that siphon drainage can be realized through the siphon drain pipe 200. When the second setting condition is further reached, the residual water in the water tank 300 has been drained, and at this time, the second shut-off valve 201 is controlled to be closed to shut off the siphon drain 200 before the lower stage 240, thereby ending the siphon drain process.

In a further aspect of this embodiment, the main drain pipe 100 and the siphon drain pipe 200 are both kept in a cut-off state during the washing process of the dishwasher. Specifically, during the washing of the dishwasher, the first and second shut-off valves 101 and 201 are controlled to be maintained in a closed state.

In the drainage device of the dishwasher according to the present embodiment, if the siphon drainage pipe 200 is filled with water flow during the washing process of the dishwasher, a siphon effect is generated to gradually draw out the washing water in the water tank 300, so that the inner container 500 is not filled with the washing water when the washing is not completed. The dishwasher generally heats the washing water when washing, and if the washing water is pumped out in the washing process, the dishwasher can be dry-burned, so that serious potential safety hazards exist.

Although the main drain pipe 100 is mainly used for rapid drainage in the operation state of the drain pump 400, it is connected to the siphon drain pipe 200 by extending upward for a certain length and bending downward, and the inlet end thereof is higher than the outlet end of the siphon drain pipe 200, and may also generate a siphon effect. Further, when the main drain pipe 100 and the descent section 240 of the siphon drain pipe 200 are filled with water flow during the washing, there is also a possibility that the washing water in the sump 300 is drawn out along the main drain pipe 100 by the siphon effect.

In this embodiment, when the dishwasher is washing, the first stop valve 101 and the second stop valve 201 are controlled to be kept in the closed state, so that the inlet ends of the main drain pipe 100 and the siphon drain pipe 200 are not communicated with the outlet end of the siphon drain pipe 200 inserted below the ground 600, and the siphon effect generated in the washing process can be avoided to pump out the washing water in the water tank 300.

In a preferred embodiment of the present embodiment, the main drain pipe 100 is formed by extending the inlet end of the main drain pipe 100 in the horizontal direction to form a horizontal extension section 150, and the vertical extension section 140 is connected to the extension end of the horizontal extension section 150 (i.e., the left end of the horizontal extension section 150 in fig. 1). Similarly, the siphon drain 200 has a horizontal section 260 extending horizontally, and the rising section 230 is formed by extending the extension end of the horizontal section 260 upward again. Because the water tank 300 is disposed near the central area of the bottom wall of the inner container 500, the main drain pipe 100 and the siphon drain pipe 200 are horizontally extended for a certain length to avoid the inner container 500 structure, so that a sufficient upward extending space is provided.

Meanwhile, for the siphon drain 200, when the residual water in the water tank 300 is completely extracted, the horizontal section 260 thereof enters the air, but the rising section 230 is still filled with the water flow, and the siphon effect is not generally destroyed. Only after the air enters the rising section 230 of the siphon drain 200 will the siphon effect be broken, resulting in a backflow of the water flow. The siphon drain 200 is extended downward by a short distance from its inlet end and then extended in a horizontal direction, and when a reverse flow of water occurs, the amount of the reverse flow water can be retained in the horizontal section 260 of the siphon drain 200 without being returned to the water tank 300.

Further, the first shut-off valve 101 is provided on the horizontally extending section 150 of the main drain pipe 100. Similarly, the second shut-off valve 201 is disposed on the horizontal section 260 of the siphon drain 200. Cutting off the main drain pipe 100 and the siphon drain pipe 200 at a position closer to the drain pump 400 can minimize the amount of water that may flow back into the sump 300. Particularly, for the siphon drain 200, the water flow in the rising section 230 is completely blocked by the second stop valve 201, effectively preventing the water flow from flowing back into the water tank 300.

Preferably, the siphon drain 200 also has a drain end 250 located below the ground 600, connected to the drop leg 240. The drain end 250 extends in a horizontal or near horizontal direction, ultimately forming the outlet end of the siphon drain 200 and communicates with the sewer line in the user's home. The above scheme is directed to the installation position of the dish washer, especially the position where the descending section 240 of the siphon drain pipe 200 is inserted into the ground 600 and the drain line of the user's home are also at a distance, ensuring that the outlet end of the siphon drain pipe 200 is lower than the inlet end thereof, and can generate a siphon effect to drain water.

In a further aspect of this embodiment, the following three embodiments may be specifically adopted as the second setting condition for controlling the end of the siphon drainage process.

As a first implementation of the present embodiment, the second setting condition is that the water level in the drain pump 400 reaches zero. Specifically, a water level sensor is provided in the drain pump 400 for detecting a water level condition therein. When the water level sensor detects that the water level in the drain pump 400 reaches zero, it indicates that the residual water in the sump 300 has been drained, i.e., the second shut-off valve 201 is controlled to be closed, ending the siphon drainage process.

In detail, as shown in fig. 2, the control method of the dish washer includes the steps of:

s11, a dish washer performs dish washing, and the first stop valve and the second stop valve are kept in a closed state;

s12, after washing is completed, opening a first stop valve and a second stop valve;

s13, starting a drainage pump to drain water;

s14, the water level in the water tank or the drainage pump is reduced to the set water level, and the first stop valve is closed;

s15, closing a drainage pump, and performing siphon drainage on the siphon drainage pipe;

s16, detecting that the water level in the drainage pump reaches zero, closing the second stop valve, and ending the drainage.

In the above scheme, when the water level in the drain pump 400 is detected to be zero, that is, air starts to enter the siphon drain pipe 200. At this time, the second stop valve 201 is closed to cut off the siphon drain 200, so that the situation that the siphon effect is destroyed due to the fact that air continues to enter the rising section 230 of the siphon drain 200, and water flows back to the water tank 300 is effectively avoided.

As a second implementation of this example, the second set condition is to detect the passage of no water in the siphon drain 200. To achieve water flow detection in the siphon drain 200, the dishwasher drain further includes a flow detection device disposed between the inlet end of the siphon drain 200 and the upper end of the drop leg 240. The flow detection device, in this embodiment specifically a flow sensor 202, is disposed on the horizontal section 260 of the siphon drain 200 between the second shut-off valve 201 and the lower end of the rising section 230. When the flow sensor 202 detects that no water passes through the siphon drain pipe 200, the residual water in the water tank 300 is drained, that is, the second stop valve 201 is controlled to be closed, and the siphon drain process is ended.

In detail, as shown in fig. 3, the control method of the dish washer includes the steps of:

s21, the dish washer performs dish washing, and the first stop valve and the second stop valve are kept in a closed state;

s22, after washing is completed, opening a first stop valve and a second stop valve;

s23, starting a drainage pump to drain water;

s24, the water level in the water tank or the drainage pump is reduced to the set water level, and the first stop valve is closed;

s25, closing the drainage pump, and performing siphon drainage on the siphon drainage pipe;

s26, detecting that no water flow in the siphon drain pipe passes through, closing the second stop valve, and ending the drainage.

In the above scenario, when the flow sensor 202 detects that the water flow is zero, it is indicated that air has entered the horizontal segment 260 of the siphon drain 200. At this time, the second shut-off valve 201 is closed to shut off the siphon drain 200, so that the drain water flow having passed through the second shut-off valve 201 is completely blocked, and the reverse flow of the water in the rising section 230 of the siphon drain 200 back into the water tank 300 is prevented.

As a third implementation of the present embodiment, the second setting condition is that the water level in the drain pump 400 reaches zero and no water flow is detected in the siphon drain 200. The dishwasher simultaneously detects the water level in the drain pump 400 and the drain flow in the siphon drain pipe 200 during the siphon drain, and only when the water level in the drain pump 400 is zero, that is, no residual water exists in the drain pump 400, and no drain water flows through the siphon drain pipe 200, it is judged that the residual water in the water tank 300 is drained, and then the second stop valve 201 is controlled to be closed, so that the siphon drain process is finished.

In detail, as shown in fig. 4, the control method of the dish washer includes the steps of:

s31, the dish washer performs dish washing, and the first stop valve and the second stop valve are kept in a closed state;

s32, after washing is completed, opening the first stop valve and the second stop valve;

s33, starting a drainage pump to drain water;

s34, the water level in the water tank or the drainage pump is reduced to the set water level, and the first stop valve is closed;

s35, closing a drainage pump, and performing siphon drainage on the siphon drainage pipe;

s36, detecting that the water level in the drainage pump reaches zero and no water flow passes through the siphon drainage pipe, closing the second stop valve, and ending the drainage.

In the scheme, through double judgment of the water level and the flow, the situation that residual water cannot be drained due to error of the detection result of one of the sensors can be avoided.

In this embodiment, the dishwasher has a drain device including a main drain pipe 100 and a siphon drain pipe 200. The main drain pipe 100 and the siphon drain pipe 200 are respectively communicated with the drain pump 400 communicated with the sump 300, and finally drain water is collected through the descending section 240 of the siphon drain pipe 200 and discharged outwards. The drain pump 400 can be opened at the initial stage of the drainage stage to drain the water outwards through the main drain pipe 100 and the siphon drain pipe 200, and the descending sections 240 of the main drain pipe 100 and the siphon drain pipe 200 have larger cross-sectional areas, so that the drainage efficiency is ensured, and the drainage time is saved. The siphon drain pipe 200 may generate a siphon effect when being filled with the drain water flow, and the main drain pipe 100 is cut off at a later stage of the drain stage, and then the drain pump 400 is turned off, so that the residual water in the sump 300 may be pumped out by using the siphon effect. The rising section 230 of the siphon drain 200 has a smaller cross-sectional area, ensuring a siphon effect and a sufficient drainage of residual water.

Example two

As shown in fig. 5, this embodiment differs from the first embodiment in that: the second set condition is that a set period of time is reached after the drain pump 400 is turned off.

Specifically, the dishwasher in this embodiment does not perform the detection of the water level in the drain pump 400 and the flow rate in the siphon drain 200 after the drain pump 400 is turned off, but starts to count the time when the drain pump 400 is turned off, i.e., cuts off the siphon drain 200, i.e., closes the second shut-off valve 201, for a set period of time. Since the flow rate detection in the siphon drain 200 is not required, the siphon drain 200 of the present embodiment does not need to be provided with a flow rate detection device, as compared with the first embodiment.

In detail, as shown in fig. 6, the control method of the dish washer in the present embodiment includes the steps of:

s41, a dish washer performs dish washing, and the first stop valve and the second stop valve are kept in a closed state;

s42, after washing is completed, opening the first stop valve and the second stop valve;

s43, starting a drainage pump to drain water;

s44, the water level in the water tank or the drainage pump is reduced to the set water level, and the first stop valve is closed;

s45, closing a drainage pump, and performing siphon drainage on the siphon drainage pipe;

and S46, closing the second stop valve when the set time period is reached, and ending the water discharge.

In the above-mentioned scheme, the specific value of the set time period is required to ensure that the residual water in the sump 300 can be completely drained through siphon drainage, and the time period required for draining the residual water is related to the current water level in the sump 300 or the drain pump 400 when the drain pump 400 is turned off. In this embodiment, after detecting that the water level in the water tank 300 or the drain pump 400 drops to the set water level, the drain pump 400 is turned off, and then the maximum duration required for siphon drainage to complete when the water tank 300 or the drain pump 400 is at the set water level can be tested in advance through multiple tests, and the maximum duration is used as the set duration for controlling the second stop valve 201 to be turned off.

In this embodiment, the dishwasher controls the end timing of the siphon drain according to the duration of the siphon drain, and omits the detection operation of the water level or the flow rate, and particularly, the flow rate detection device provided on the siphon drain 200. The arrangement of the sensing device is reduced, so that the production cost of the dish washer is reduced.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.

Claims (10)

1. A drain device of a dishwasher, comprising:

a water tank;

a drain pump communicated with the water tank;

the siphon drain pipe is communicated with the drain pump and provided with an ascending section which is arranged in an upward extending mode and a descending section which is communicated with the ascending section and extends downwards, and the cross section area of the ascending section is smaller than that of the descending section;

the inlet end of the main drain pipe is communicated with the drain pump, and the outlet end of the main drain pipe is communicated to the descending section of the siphon drain pipe;

the inlet end of the siphon drain pipe is higher than the outlet end of the siphon drain pipe for outward drainage, and the siphon drain is performed after the drain pump stops working.

2. The drain of a dishwasher of claim 1, wherein the cross-sectional area of the main drain is greater than the cross-sectional area of the rising section of the siphon drain.

3. The drain device of a dishwasher according to claim 2, wherein the siphon drain further comprises a bending section provided between the rising section and the falling section, one end of which is connected to an upper end of the rising section, and the other end of which is connected to an upper end of the falling section; the highest position of the bending section is higher than the upper end of the descending section, and the cross section area of the bending section is equal to the cross section area of the ascending section;

the main drain pipe is provided with a vertical extension section which extends upwards, and the outlet end of the main drain pipe is connected to the upper end of the descending section of the siphon drain pipe or a region close to the upper end of the descending section.

4. A drain device of a dishwasher according to claim 3, wherein the end of the vertically extending section is connected to a downwardly bent connection section, the connection section being connected to a drop section of a siphon drain; the highest position of the connecting section is higher than the highest position of the bending section in the siphon drain pipe.

5. The drain device of the dishwasher of any one of claims 1 to 4, wherein a first shut-off valve is provided on the main drain pipe for controlling on-off of the main drain pipe;

the second stop valve is arranged on the siphon drain pipe and used for controlling the on-off of the siphon drain pipe; the second stop valve is arranged between the inlet end of the siphon drain pipe and the upper end of the descending section.

6. The drain of a dishwasher of any one of claims 1 to 4, further comprising a flow sensing device disposed between the inlet end of the siphon drain and the upper end of the drop leg.

7. A control method of a dishwasher, characterized in that the dishwasher comprises a drain device of the dishwasher according to any one of claims 1-6, the control method comprising:

starting a drainage pump, wherein water in the water tank enters the main drainage pipe and the siphon drainage pipe, and is collected to the descending section of the siphon drainage pipe to be discharged outwards;

cutting off the main drain pipe when the first set condition is reached;

closing the draining pump and performing siphon draining through the siphon draining pipe.

8. The control method of a dishwasher according to claim 7, wherein the first set condition is that a water level in a sump or a drain pump is lowered to a set water level, the set water level being higher than an inlet end of a siphon drain.

9. The control method of a dishwasher according to claim 7 or 8, further comprising, after closing the drain pump to siphon drain: when the second set condition is reached, cutting off the siphon drain pipe;

the second setting condition is: the passage of no water is detected before the water level in the drain pump reaches zero and/or the drop section of the siphon drain, or a set period of time is reached after the drain pump is turned off.

10. The control method of a dishwasher according to claim 7 or 8, wherein the main drain pipe and the siphon drain pipe are kept in a cut-off state during washing of the dishwasher.