CN117883020A - 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 way and a descending section which is communicated with the ascending section and is arranged in a downward extending way, and the inlet end of the siphon drain pipe is higher than the outlet end of the siphon drain pipe for draining water outwards; and the inlet end of the main drain pipe is communicated with the drain pump, the outlet end of the main drain pipe is independent of the siphon drain pipe to drain water outwards, and the cross section area of the main drain pipe is larger than that of the siphon drain pipe. The drainage device can drain water through the main drainage pipe and the siphon drainage pipe simultaneously during operation of the drainage pump, the larger cross section area of the main drainage pipe is beneficial to improving drainage efficiency, residual water in the water tank can be pumped out by utilizing the siphon effect after the drainage pump is closed, the smaller cross section area of the siphon drainage pipe ensures the siphon effect, and further the problem of residual water in the water tank of the dish washing machine 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 overcome the defects of the prior art, and provides a water draining device of a dish washing machine and a control method of the dish washing machine, which can be improved on the basis of the water draining structure of the existing dish washing machine, and can realize efficient water draining of the dish washing machine and prevent water tank residual water.

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 is arranged in a downward extending mode, and the inlet end of the siphon drain pipe is higher than the outlet end of the siphon drain pipe for draining water outwards;

and the inlet end of the main drain pipe is communicated with the drain pump, the outlet end of the main drain pipe is independent of the siphon drain pipe to drain water outwards, and the cross section area of the main drain pipe is larger than that of the siphon drain pipe.

Further, a siphon stop valve is arranged on the siphon drain pipe and used for controlling the on-off of the siphon drain pipe.

Further, the siphon drain pipe is also provided with a starting section, one end of the starting section is connected with the drain pump to form an inlet end of the siphon drain pipe, and the other end of the starting section is connected with the lower end of the rising section; the siphon break valve is disposed on the initiation section.

Further, a flow detection device is further arranged on the siphon drain pipe, and the flow detection device is arranged between the outlet end of the siphon drain pipe and the siphon stop valve.

Further, the siphon drain pipe is also provided with a starting section connected with the drain pump, and the rising section is communicated with the drain pump through the starting section; the siphon stop valve is arranged on the initial section, and the flow detection device is arranged between the siphon stop valve and the lower end of the rising section.

Further, the initial section of the siphon drain pipe extends downwards for a certain distance from the inlet end connected with the drain pump and then horizontally extends to be connected with the lower end of the rising section; the top position of the upward extension of the rising section is higher than the inlet end of the siphon drain pipe.

Further, a main drain stop valve is arranged on the main drain pipe and used for controlling the on-off of the main drain pipe;

and/or an anti-siphon structure is arranged between the inlet end and the outlet end of the main drain pipe.

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 respectively and is discharged outwards from respective outlet ends;

the first setting condition is reached, and the drainage pump is closed;

and (5) carrying out siphon drainage through a siphon drainage pipe.

Further, the first setting condition is that the drain pump is started for a first set period of time.

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

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

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

In the invention, when the drain pump of the dish washer drain device is started, the drain water flow can enter the main drain pipe and the siphon drain pipe simultaneously and be discharged outwards respectively, and the main drain pipe has a larger cross section area, so that higher drain efficiency in the initial stage of drain is ensured. After the drainage pump is closed, the siphon drainage can be realized by utilizing the siphon effect generated by the siphon drainage pipe, so that the residual water in the water tank is pumped out by the siphon drainage pipe under the siphon effect. The cross-sectional 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 can be ensured to be drained, and the problem that the residual water in the water tank causes secondary pollution to tableware is avoided. The main drain pipe and the siphon drain pipe are mutually independent, can be directly improved on the drain structure of the existing dish washer, and are easy to realize.

According to the invention, the siphon stop valve is arranged, so that the siphon drain pipe can be controlled to be in a cut-off state in the washing process, and dry burning faults caused by the fact that the washing water is pumped out of the water tank due to the siphon effect are avoided. The siphon stop valve is arranged at the front of the lower end of the rising section of the siphon drain pipe, and the siphon drain pipe is cut off between the rising section and the inlet end of the siphon drain pipe, so that the situation that water flow in the rising section flows back into the drain pump or the water tank when the drain is nearly finished and the siphon effect is destroyed can be avoided, and the situation that residual water does not exist in the water tank is ensured.

According to the invention, the main drain pipe is provided with the main drain stop valve or the anti-siphon structure, so that the main drain pipe can be prevented from generating a siphon effect in the washing process, and further, the washing water is pumped out of the water tank, and the problems of dry burning faults and potential safety hazards of a dish washer in the washing process are avoided.

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 main drain stop valve; 140. a vertically extending section; 150. a horizontal extension; 200. a siphon drain; 201. a siphon shut-off valve; 202. a flow sensor; 230. a rising section; 240. a descent section; 250. a drainage end section; 270. a starting 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 communicating with the drain pump 400 and having an ascending section 230 extending upward and a descending section 240 communicating with the ascending section 230 and extending downward, the inlet end of the siphon drain pipe 200 being higher than the outlet end of the siphon drain pipe draining outward;

the main drain pipe 100 has an inlet end communicating with the drain pump 400 and an outlet end draining outwardly independently of the siphon drain pipe 200, and the main drain pipe 100 has a cross-sectional area larger than that of the siphon drain pipe 200.

In the above scheme, when the drain pump 400 works, water in the water tank 300 can be driven to enter the main drain pipe 100 and the siphon drain pipe 200 simultaneously, and then is discharged outwards respectively along the main drain pipe 100 and the siphon drain pipe, especially the main drain pipe 100 has a larger cross-sectional area, so that higher drain efficiency can be achieved in the initial stage of drainage, and the drain time is saved.

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, and after the drain pump 400 is turned off, water in the water tank 300 can be continuously pumped out by the siphon drain pipe 200 under the siphon effect, so that the occurrence of the situation that residual water exists in the water tank 300 and secondary pollution is possibly generated to the subsequently washed tableware can be avoided. The small cross-sectional area of the siphon drain 200 ensures a siphon effect and prevents the problem of the reverse flow of water in the siphon drain 200 into the water tank 300 when the siphon drain is nearly completed. The main drain pipe 100 is matched with the siphon drain pipe 200, which gives consideration to the drain efficiency of the dish washer and prevents the problem of residual water in the sump 300.

As a preferred embodiment of the present invention, a siphon break valve 201 is provided to the siphon drain 200 for controlling the on/off of the siphon drain 200.

Further, the siphon drain 200 further has a start section 270, one end of the start section 270 is connected to the drain pump 400 to form an inlet end of the siphon drain 200, and the other end is connected to a lower end of the rising section 230. Siphon break valve 201 is disposed on the start segment 270.

In the above-described scheme, when the siphon drainage is completed, the siphon drainage pipe 200 can be cut off by the siphon stop valve 201, and particularly, the backflow of the water flow in the rising section 230 into the water tank 300 can be blocked, so that the residual water in the water tank 300 is ensured not to exist. Meanwhile, the siphon drain pipe 200 can be cut off by the siphon cut-off valve 201 when the dishwasher is washing, so that the problem of pumping the washing water from the sump 300 due to the siphon effect can be avoided.

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 to provide a driving force to drain the water in the sump 300 to the outside.

The drain device further includes a main drain pipe 100 and a siphon drain pipe 200, which are independent from each other. Wherein an inlet end of the siphon drain pipe 200 is connected to the drain pump 400, and an outlet end thereof is for draining the water outwards. The inlet end of the main drain pipe 100 communicates with the drain pump 400, and the outlet end is drained outwardly independently of the siphon drain pipe 200.

The drain device of the dishwasher of the present embodiment can realize siphon drainage through the siphon drain pipe 200. 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 outward drain thereof, so that when the siphon drain pipe 200 is filled with the drain water flow, the drain pump 400 may stop operating, and at this time, the siphon drain pipe 200 is capable of performing siphon drain 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 drain device of the dishwasher is formed with a siphon structure, the drain pump 400 is controlled to be opened when the drain is started, and water in the water tank 300 can enter the main drain pipe 100 and the siphon drain pipe 200 respectively, and then be discharged outwards along the two different pipelines respectively. Since the water is discharged from two different water discharge channels simultaneously and outwards at the initial stage of water discharge, higher water discharge efficiency can be realized. After the siphon drain 200 is in a state of being filled with the drain water flow, the drain pump 400 may be turned off, and at this time, a small amount of water remaining in the sump 300 may continue to be discharged outside along the siphon drain 200 under the siphon effect. In the latter stage of drainage, the water in the water tank 300 can be more thoroughly pumped out than the method of draining by the drain pump 400 alone, so that 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. The main drain pipe 100 and the siphon drain pipe 200 are mutually independent, so that the drain device of the dish washer of the embodiment can be directly improved on the drain structure of the existing dish washer with one drain pipe (for example, one siphon drain pipe 200 is additionally arranged), and the structure is simple and easy to realize, thereby being beneficial to reducing the production cost.

Further, the cross-sectional area of the main drain pipe 100 in this embodiment is larger than that of the siphon drain pipe 200. Specifically, when the main drain pipe 100 and the siphon drain pipe 200 are both circular pipes, the cross-sectional diameter of the main drain pipe 100 is larger than that 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 of draining during the operation of the drain pump 400, a large portion of the drain water is directly discharged to the outside from the main drain pipe 100, and only a small portion of the drain water is discharged along the siphon drain pipe 200 at this stage. When a small amount of washing water remains in the sump 300, the drain pump 400 may be turned off, and the remaining water in the sump 300 may be completely drawn out by using a siphon effect generated by the siphon drain pipe 200, preventing a problem of the remaining water in the sump 300.

The dish washer firstly starts the draining pump 400 in the draining stage, and simultaneously drains outwards by utilizing the main draining pipe 100 and the siphon draining pipe 200, wherein the main draining pipe 100 has larger cross section area, and can further realize larger draining efficiency, thereby saving the draining time of the dish washer. The siphon drain 200 has a relatively smaller cross-sectional area, and it is easier to maintain the state in which the siphon drain 200 is filled with water during the siphon drain, avoiding the siphon effect from being damaged by air entering before the completion of the drain. Meanwhile, the smaller cross-sectional area also enables the water amount which can be contained in the siphon drain pipe 200 to be smaller, when siphon drainage is about to be completed, even if the air entering the ascending section 230 breaks the siphon effect, the situation that the drain water flows back occurs, the water cannot enter the water tank 300 basically because the water amount of the backflow is smaller, and the problem that residual water exists in the water tank 300 is effectively prevented.

In a further aspect of this embodiment, a main drain stop valve 101 is disposed on the main drain pipe 100, for controlling on/off of the main drain pipe 100. Specifically, the dishwasher controls the main drain shutoff valve 101 to be opened, and the main drain pipe 100 is in an on state, and when the dishwasher controls the main drain shutoff valve 101 to be closed, the main drain pipe 100 is in an off state.

Before the water discharge is started, the main water discharge stop valve 101 is controlled to be in an open state, so that the main water discharge pipe 100 is conducted, and after the water discharge pump 400 is started, the water in the water tank 300 is rapidly discharged along the main water discharge pipe 100 under the driving action of the water discharge pump 400.

In detail, the main drain pipe 100 horizontally extends from an inlet end thereof by a certain distance to form a horizontal extension 150, and then upwardly extends to form a vertical extension 140. The extending end of the vertical extension 140 is further connected to a downwardly extending pipe section (not shown) to eventually drain the drain water outwardly. 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 extends horizontally for a certain length to avoid the inner container 500, so that a sufficient space for extending upwards is provided.

Meanwhile, since the main drain pipe 100 itself has a structure that extends upward and then downward, there is a possibility that a siphon effect is generated. In order to prevent the dish washer from washing, the main drain pipe 100 gradually pumps the washing water in the tub 300 by a siphon effect, and controls the main drain shut-off valve 101 to maintain a closed state during the washing process, thereby enabling the main drain pipe 100 to be in a shut-off state without pumping water from the tub 300. Thus, the case where the washing water is not present in the inner container 500 when the washing is not completed is avoided. In addition, 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. The scheme of the embodiment avoids the above-mentioned potential safety hazard by controlling the main drain stop valve 101 to cut off the main drain pipe 100.

In another aspect of this embodiment, an anti-siphon structure is provided between the inlet end and the outlet end of the main drain pipe 100. Specifically, the anti-siphon structure is a respirator on a dishwasher in the prior art, and the arrangement of the respirator can prevent the main drain pipe 100 from generating a siphon effect in the washing process of the dishwasher, so that the situation that the washing water is pumped out along the main drain pipe 100 in the washing process can not occur.

In yet another aspect of this embodiment, the main drain pipe 100 is provided with both the main drain shutoff valve 101 and the anti-siphon structure, i.e., the respirator. In this scheme, the main drain pipe 100 can be prevented from generating siphon effect to pump water through the respirator during the washing process of the dish washer, and then the main drain stop valve 101 can be in an open state or a closed state during the washing process.

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

starting the drain pump 400, wherein the water in the water tank 300 enters the main drain pipe 100 and the siphon drain pipe 200 respectively and is discharged outwards from the respective outlet ends;

reaching the first setting condition, closing the drain pump 400;

siphon drainage is performed through the siphon drain pipe 200.

In the above-mentioned scheme, the dish washer controls the drain pump 400 to be opened when starting the drain, on the one hand, realizes the initial quick drain, and on the other hand, also fills the siphon drain pipe 200 with the drain water flow, thereby realizing the later siphon drain.

In a preferred embodiment of the present embodiment, the main drain pipe 100 is cut off and then the drain pump 400 is turned off when the first set condition is reached. Specifically, the dishwasher controls the main drain shutoff valve 101 to be closed to shut off the main drain line 100.

The main drain pipe 100 is cut off by the main drain stop valve 101 before the drain pump 400 is closed, at this time, the drain pump 400 is still in operation, and since the main drain pipe 100 is not conducted any more, the drain water flow can only enter the siphon drain pipe 200 at this time, ensuring that no air will enter the siphon drain pipe 200 before the drain pump 400 is closed.

Preferably, the main drain stop valve 101 is disposed on the horizontal extension 150 of the main drain pipe 100, more preferably on the horizontal extension 150 near the drain pump 400 (i.e., near the right end of the horizontal extension 150 in fig. 1). In this way, the water flow in the main drain pipe 100 is prevented from flowing back into the water tank 300 by cutting the water flow near the inlet end of the main drain pipe 100, and particularly, the problem that a small amount of water flows back into the water tank 300 along the main drain pipe 100 after siphon drainage is completed, resulting in residual water in the water tank 300, is avoided.

In a further aspect of this embodiment, the first setting condition for controlling the drain pump 400 to be turned off is that the drain pump 400 is turned on for a first set period of time.

In the above-mentioned scheme, the specific value of the first set period of time is related to the amount of wash water in the dishwasher liner 500 and the rate of outward drainage in the running state of the drain pump 400, and at least it is required to ensure that when the drain pump 400 is started for the first set period of time, the water level in the water tank 300 is higher than the inlet end of the siphon drain pipe 200, so as to prevent air from being sucked into the siphon drain pipe 200 before starting siphon drain.

For example, it may be tested in advance that a time period required for the drain pump 400 to be opened to drain until the water level in the sump 300 or the drain pump 400 drops to a set water level when the dishwasher washes with a normal washing water level is used as the first set time period. Wherein the set water level is higher than the inlet end of the siphon drain pipe 200.

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. 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 this way, on the one hand, it is possible to prevent air from entering the siphon drain 200, and when the siphon effect is broken, a small amount of water in the siphon drain 200 flows back into the water tank 300, resulting in a problem of residual water in the water tank 300. On the other hand, when the dishwasher is operated again to wash dishes by feeding water into the inner tub 500, the siphon drain 200 is in a cut-off state, and the problem that the washing water in the inner tub 500 is drawn out by the siphon drain 200 due to the siphon effect during washing of dishes is avoided.

In order to control the on-off of the siphon drain pipe 200, the drain apparatus further comprises a siphon 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 siphon break valve 201.

Further, the siphon drain 200 further has a start section 270, one end of the start section 270 is connected to the drain pump 400 to form an inlet end of the siphon drain 200, and the other end of the start section 270 is connected to a lower end of the rising section 230. Siphon break valve 201 is disposed on the start segment 270.

Preferably, the start section 270 of the siphon drain pipe 200 extends downward a distance from the inlet end connected to the drain pump 400, and then extends horizontally to be connected to the lower end of the rising section 230. The rising section 230 extends upwardly to a top position above the inlet end of the siphon drain 200. That is, the inlet end of the siphon drain 200 is higher than the lower end of the rising section 230 thereof, and the upper end of the rising section 230 is higher than the inlet end.

In the above-mentioned scheme, the siphon drain pipe 200 sequentially includes the start section 270, the ascending section 230 and the descending section 240 from the inlet end, and in general, when the start section 270 starts to enter air, the ascending section 230 is still in a state of being filled with water flow, and the siphon effect is not damaged. 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 stop valve 201 is disposed before the rising section 230 of the siphon drain pipe 200, and is closer to the drain pump 400, so that the amount of water flowing back into the water tank 300 can be reduced, and the water flow which may flow back in the rising section 230 can be completely blocked, thereby effectively avoiding the problem that the water flow flows back into the water tank 300.

In this embodiment, 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 siphon break valve 201 is controlled to close, ending the siphon drainage process.

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

s11, the dish washer performs tableware washing, and the siphon stop valve is kept in a closed state;

s12, after washing is completed, opening a main drainage stop valve and a siphon stop valve;

s13, starting a drainage pump to drain water;

s14, starting the drainage pump to reach a first set duration;

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 siphon 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 siphon shut-off valve 201 is closed to shut off the siphon drain 200, so that the situation that the siphon effect is destroyed by the air continuing to enter the rising section 230 of the siphon drain 200, and the water flow 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 drain of the dishwasher further comprises a flow detection device disposed between the outlet end of the siphon drain 200 and the siphon shut-off valve 201. When the flow rate detection device detects that the water flow rate is zero, it indicates that the water in the water tank 300 is completely discharged, and there is no water in a section from the inlet end of the siphon drain pipe 200 to the position of the siphon stop valve 201. At this time, the siphon break valve 201 is controlled to be closed, and even if the reverse flow of the water occurs later, the reverse flow of the water can be blocked by the siphon break valve 201 without entering the water tank 300.

The flow detection device, in this embodiment specifically a flow sensor 202, is disposed on the water initiation section 270 of the siphon drain 200 between the siphon 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 siphon stop valve 201 is controlled to be closed, and the siphon drainage process is finished.

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

s21, the dish washer performs tableware washing, and the siphon stop valve is kept in a closed state;

s22, after washing is completed, opening a main drainage stop valve and a siphon stop valve;

s23, starting a drainage pump to drain water;

s24, starting the drainage pump to reach a first set duration;

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

s26, detecting that no water flow passes through the siphon drain pipe, closing the siphon 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 initial section 270 of the siphon drain 200, but has not entered the rising section 230, i.e., the siphon effect has not been destroyed. At this time, the siphon break valve 201 is closed to shut off the siphon drain 200, so that the drain water flow having passed through the siphon break 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 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, the dishwasher judges that the residual water in the water tank 300 is drained, and further controls the siphon stop valve 201 to be closed, thereby ending the siphon drain process.

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

s31, the dish washer performs tableware washing, and the siphon stop valve is kept in a closed state;

s32, after washing is completed, opening a main drainage stop valve and a siphon stop valve;

s33, starting a drainage pump to drain water;

s34, starting the drainage pump to reach a first set duration;

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 siphon 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 are independently discharged to the outside. 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 main drain pipe 100 has a larger cross-sectional area, so that the drainage efficiency at the initial stage of the drainage stage 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 may also pump out residual water in the sump 300 using the siphon effect after closing the drain pump 400 at a later stage of the drain. The siphon drain pipe 200 has a small cross-sectional area, ensures a siphon effect, ensures that residual water in the water tank 300 can be sufficiently discharged, and avoids a series of problems caused by the existence of residual water in the water tank 300.

Example two

As shown in fig. 5, this embodiment differs from the first embodiment in that: the second set condition is that a second 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 siphon shut-off valve 201, for a second 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, the dish washer performs tableware washing, and the siphon stop valve is kept in a closed state;

s42, after washing is completed, opening a main drainage stop valve and a siphon stop valve;

s43, starting a drainage pump to drain water;

s44, starting the drainage pump to reach a first set duration;

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

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

In the above-mentioned scheme, the specific value of the second set period of time needs to ensure that the residual water in the sump 300 can be completely drained through siphon drainage, and the period of time 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, the drain pump 400 is turned on for a first set period of time and then turned off, and the water level in the water tank 300 or the drain pump 400 can normally drop to a level near a specific level. The maximum period of time required for siphon drainage to be completed when the drain tank 300 or the drain pump 400 is at the specific water level may be tested through a plurality of tests in advance, as a set period of time for controlling the siphon break valve 201 to be closed.

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, for example, 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.

Example III

As shown in fig. 1 and 5, this embodiment is different from the first and second embodiments described above in that: the first set 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 the siphon drain, and when the water level detected by the water level sensor drops to the set water level, the drain pump 400 is turned off to perform the siphon drain.

In this embodiment, the actual water level in the water tank 300 or the water level in the water drain pump 400 is directly detected, so that the water drain pump 400 is controlled to be turned off, and compared with the mode of controlling the water drain pump 400 according to the opening time in the first and second embodiments, the water drain pump 400 is controlled to be turned off at the same water level when the dishwasher is drained each time. Particularly, with respect to the scheme of controlling the closing of the siphon break valve 201 according to the closing time period of the drain pump 400, since the siphon drainage is started at the same water level height every time of the drainage and thus the time required for starting the siphon drainage until the residual water in the sump 300 is just completely pumped out is substantially uniform, the closing time period of the siphon break valve 201 can be controlled more precisely, preventing the backflow of the water flow in the siphon drain pipe 200 into the sump 300.

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 is arranged in a downward extending mode, and the inlet end of the siphon drain pipe is higher than the outlet end of the siphon drain pipe for draining water outwards;

and the inlet end of the main drain pipe is communicated with the drain pump, the outlet end of the main drain pipe is independent of the siphon drain pipe to drain water outwards, and the cross section area of the main drain pipe is larger than that of the siphon drain pipe.

2. The drain device of the dishwasher of claim 1, wherein a siphon shut-off valve is provided on the siphon drain for controlling on-off of the siphon drain.

3. The drain device of a dishwasher according to claim 2, wherein the siphon drain pipe further has a start section, one end of which is connected to the drain pump to form an inlet end of the siphon drain pipe, and the other end of which is connected to a lower end of the rising section; the siphon break valve is disposed on the initiation section.

4. The drain device of the dishwasher of claim 2, wherein a flow rate detecting device is further provided on the siphon drain, the flow rate detecting device being provided between an outlet end of the siphon drain and the siphon shut-off valve.

5. The drain device of a dishwasher of claim 4, wherein the siphon drain further has a start section connected to the drain pump, the rise section being in communication with the drain pump through the start section; the siphon stop valve is arranged on the initial section, and the flow detection device is arranged between the siphon stop valve and the lower end of the rising section.

6. The drain device of dishwasher of claim 5, wherein the initial section of the siphon drain pipe extends downward a distance from the inlet end connected to the drain pump and then horizontally extends to be connected to the lower end of the rising section; the top position of the upward extension of the rising section is higher than the inlet end of the siphon drain pipe.

7. The drain device of the dishwasher of any one of claims 1 to 6, wherein a main drain shut-off valve is provided on the main drain pipe for controlling on-off of the main drain pipe;

and/or an anti-siphon structure is arranged between the inlet end and the outlet end of the main drain pipe.

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

starting a drainage pump, wherein water in the water tank enters the main drainage pipe and the siphon drainage pipe respectively and is discharged outwards from respective outlet ends;

the first setting condition is reached, and the drainage pump is closed;

and (5) carrying out siphon drainage through a siphon drainage pipe.

9. The method of claim 8, wherein the first set condition is that the drain pump is turned on for a first set period of time.

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

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