CN117652990A - 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 drain pump communicated with the water tank; the main drain pipe is provided with a drain front section communicated with the drain pump and at least partially extending upwards, and a drain rear section connected with the drain front section and extending downwards; the inlet end of the siphon drain pipe is communicated with the drain pump, the outlet end of the siphon drain pipe is higher than the inlet end and is communicated to the drain rear section of the main drain pipe, and the cross section area of the siphon drain pipe is smaller than that of the main drain pipe; the outlet end of the main drain pipe is lower than the inlet end of the siphon drain pipe, and the siphon drain pipe performs siphon drainage after the drain pump stops working. According to the invention, the main drain pipe can realize quick drainage at the beginning stage of drainage, the drainage efficiency is improved, the siphon drain pipe realizes siphon drainage by utilizing the siphon effect, 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 main drain pipe is provided with a drain front section communicated with the drain pump and at least partially extending upwards, and a drain rear section connected with the drain front section and extending downwards;

the inlet end of the siphon drain pipe is communicated with the drain pump, the outlet end of the siphon drain pipe is higher than the inlet end and is communicated to the drain rear section of the main drain pipe, and the cross section area of the siphon drain pipe is smaller than that of the main drain pipe;

the outlet end of the main drain pipe is lower than the inlet end of the siphon drain pipe, and the siphon drain pipe performs siphon drainage after the drain pump stops working.

Further, the joint of the drainage front section and the drainage rear section forms the highest position of the main drainage pipe;

the siphon drain pipe is provided with an extension section extending upwards, so that the outlet end of the siphon drain pipe is connected with the upper area of the drain back section; the outlet end of the siphon drain pipe is lower than the highest position of the main drain pipe.

Further, the extending end of the extending section is provided with a bending section which bends downwards, and the siphon drain pipe is connected with the drain back section through the bending section;

preferably, one end of the bending section is connected with the top end of the extending section, and the other end of the bending section is connected with the drainage rear section through an inclined part; the inclined part extends downwards from the bending section and is inclined towards the direction approaching the rear drainage section.

Further, a first stop valve is arranged on the drainage front section of the main drain pipe and used for controlling the on-off of the drainage front section; and a second stop valve is arranged on the siphon drain pipe and used for controlling the on-off of the siphon drain pipe.

Further, the drainage front section of the main drain pipe extends from the inlet end of the main drain pipe along the horizontal direction for a certain distance and then extends vertically upwards, and the first stop valve is arranged on the area where the drainage front section extends horizontally;

and/or the siphon drain pipe is provided with a horizontal section which is horizontally arranged in an extending way and an extending section which is upwards extended from the extending end of the horizontal section, and the second stop valve is arranged on the horizontal section of the siphon drain pipe.

Further, a flow detection device is arranged on the siphon drain pipe;

preferably, the flow detection device is disposed between a second shut-off valve on the siphon drain and the start end of the extension.

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 a water tank enters a main drainage pipe and a siphon drainage pipe;

cutting off the front drainage section of the main drainage pipe when the first set condition is reached;

closing the drainage pump, and carrying out siphon drainage through the siphon drainage pipe and the drainage rear section of the main drainage 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 in the siphon drain, or a set period of time is reached 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.

According to the invention, the draining pump is started in the initial draining stage of the dish washer, the draining pump is drained outwards through the main draining pipe and the siphon draining pipe, the cross section area of the main draining pipe is larger, higher draining efficiency can be realized, and the draining time is saved. 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 discharged outwards from the siphon drainage pipe and the drainage rear section of the siphon drainage pipe under the siphon effect, the cross section area of the siphon drainage pipe is smaller, the siphon effect can be ensured, the residual water 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 siphon drain pipe is connected with the upper area of the drain back section, and the connection position is lower than the highest position of the main drain pipe, namely the drain water flow can not pass through the highest position of the main drain pipe during siphon drainage, so that the siphon effect can be ensured to be formed after the drain pump is closed.

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 water discharge front section of the main water discharge pipe to be cut off, and then controlling the water discharge pump to be closed, so that the siphon water discharge pipe and the water discharge rear section of the main water discharge pipe are ensured to be filled with water discharge water flow, and siphon water discharge is realized. The second stop valve cuts off the siphon drain pipe, 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; 110. a drainage front section; 120. a drainage rear section; 130. a drainage end section; 200. a siphon drain; 201. a second shut-off valve; 202. a flow sensor; 210. an extension section; 220. bending sections; 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 main drain pipe 100 having a drain front section 110 communicating with the drain pump 400 and extending at least partially upward, and a drain rear section 120 connected to the drain front section 110 and extending downward;

and a siphon drain pipe 200 having an inlet end communicating with the drain pump 400 and an outlet end higher than the inlet end and communicating with the drain rear section 120 of the main drain pipe 100, the siphon drain pipe 200 having a smaller cross-sectional area than that of the main drain pipe 100.

The drain rear section 120 of the main drain pipe 100 extends at least downward to a height lower than the inlet end of the siphon drain pipe 200, and the siphon drain pipe 200 performs siphon drainage after the drain pump 400 stops operating.

In the above-described scheme, since the lower end of the drain rear section 120 of the main drain pipe 100 is lower than the inlet end of the siphon drain pipe 200, when the siphon drain pipe 200 and the drain rear section 120 of the main drain pipe 100 are filled with the drain water flow, a siphon effect is generated, so that the water in the water tank 300 is sufficiently drained 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 main drain pipe 100 is mainly used for draining water under the operation state of the drain pump 400, and the larger cross-sectional area is beneficial to improving the drainage efficiency, so that the drainage time is saved. The siphon drain 200 is used to generate a siphon effect, and the use of a relatively small cross-sectional area is advantageous in ensuring the siphon effect and ensuring that the residual water in the water tank 300 can be completely drained by using the siphon effect. The use of different cross-sectional areas for the main drain 100 and the siphon drain 200 allows for efficient drainage and adequate drainage of residual water.

As a preferred embodiment of the present invention, a first shut-off valve 101 is provided at the drainage front section 110 of the main drainage pipe 100 for controlling the on-off of the drainage front section 110; the siphon drain pipe 200 is provided with a second shut-off valve 201 for controlling the on-off of the siphon drain pipe 200.

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 main drain pipe 100 is connected to the drain pump 400, and an outlet end forms a drain outlet for draining water to the outside of the dishwasher. The siphon drain pipe 200 has an inlet end communicating with the drain pump 400 and an outlet end connected between the inlet end and the outlet end of the main drain pipe 100.

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

In this embodiment, the drain device of the dishwasher can realize siphon drainage. Specifically, the main drain pipe 100 has a drain front section 110 communicating with the drain pump 400 and disposed to extend at least partially upward, and a drain rear section 120 connected to the drain front section 110 and extending downward. The siphon drain 200 has an outlet higher than an inlet thereof and communicates with the drain rear section 120 of the main drain 100. The outlet end of the main drain pipe 100 is lower than the inlet end of the siphon drain pipe 200 so that the siphon drain pipe 200 can perform siphon drain after the drain pump 400 stops operating.

In the above-described aspect, the drain rear section 120 of the main drain pipe 100 extends downward to be inserted below the ground 600, so that the outlet end of the main drain pipe 100 is located below the ground 600 to drain the water. The outlet end of the siphon drain pipe 200 is higher than the inlet end thereof, and thus the siphon drain pipe 200 and the drain rear section 120 of the main drain pipe 100 together constitute a siphon structure which is bent upward and downward first and has a water outlet height lower than a water inlet height.

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, and 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. After the drain rear section 120 of the main drain pipe 100 and the siphon drain pipe 200 are both filled with the drain water flow, the drain front section 110 of the main drain pipe 100 is cut off, and the drain pump 400 is turned off, so that the water remaining in the sump 300 can be discharged outwardly along the siphon drain pipe 200 and the drain rear section 120 of the main drain pipe 100 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 aspect of this embodiment, the cross-sectional area of the main drain pipe 100 is greater than the cross-sectional area of the siphon drain pipe 200, allowing for greater drainage flow in the main drain pipe 100. 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, and most of the washing water is drained outward from the main drain pipe 100. When a small amount of washing water remains in the sump 300, siphon drainage is performed by the siphon drainage pipe 200, and the remaining washing water in the sump 300 is sufficiently drawn out, preventing the remaining water from being present in the sump 300.

The dish washer of this embodiment opens drain pump 400 earlier in the drainage stage, utilizes main drain pipe 100 and siphon drain pipe 200 to outwards drain simultaneously, and main drain pipe 100 that has bigger cross-sectional area at this moment realizes bigger drainage flow more easily to have higher drainage efficiency, be favorable to saving the long period of time that the drainage needs.

And the siphon effect is utilized for draining, when the draining 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 in the ascending 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 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 siphon drain 200 has a smaller cross-sectional area and thus contains a smaller amount of water, and after the residual water in the water tank 300 completely enters the siphon drain 200, even if the reverse flow of the drain water occurs due to the siphon effect being destroyed by the entering air, the residual water in the water tank 300 does not substantially enter the water tank 300 due to the small amount of reverse flow.

While the drain back section 120 forming the siphon structure has a larger cross-sectional area than the main drain pipe 100, it forms the descent section of the siphon structure, i.e., the drain water flows downward in the drain back section 120 and is discharged, generally without disrupting the siphon effect by air from the side of the descent section. And even when the water in the water tank 300 is completely drawn out and thus air is introduced into the siphon structure, the water flow in the drain back section 120 is downwardly discharged by gravity without being backwardly flowed into the water tank 300.

In a further aspect of this embodiment, the front and rear drainage sections 110, 120 of the main drain pipe 100 form the highest position of the main drain pipe 100 where they are connected. The siphon drain 200 has an upwardly extending extension 210, with the outlet end of the siphon drain 200 being connected to the upper region of the drain back section 120. The outlet end of the siphon drain 200 is lower than the highest position of the main drain 100.

In the above-described scheme, the extension section 210 of the siphon drain 200 extends upward to be connected to the upper region of the drain rear section 120, ensuring that the siphon drain 200 has an extension structure with an outlet end higher than an inlet end. And the outlet end of the siphon drain 200 is lower than the highest position of the main drain 100, that is, the main drain 100 is connected to the outlet end of the siphon drain 200 downstream of its highest position in the direction of water flow in the main drain 100. In this way, after the drain pump 400 is turned off, even if the water flow in the front drain stage 110 flows back under the action of gravity to cause air to enter, the state that the rear drain stage 120 is filled with water flow is not affected, and thus the siphon drain structure formed by the siphon drain pipe 200 and the rear drain stage 120 of the main drain pipe 100 together can be kept in a full state, thereby ensuring that the siphon effect can be generated to thoroughly drain the water in the water tank 300.

Further, in the present embodiment, the extension section 210 of the siphon drain pipe 200 has a bending section 220 bent downward at the extension end, and the siphon drain pipe 200 is connected to the drain rear section 120 of the main drain pipe 100 via the bending section 220.

The drain rear section 120 of the main drain pipe 100 extends downward, in which the flow of drain water flows downward. Through the arrangement of the bending section 220, the outlet end of the siphon drain pipe 200 is downward or nearly downward, so that the drainage water flow does not need to be greatly turned when being merged into the drainage rear section 120 of the main drain pipe 100 by the siphon drain pipe 200, and the problem that the drainage water flow does not smoothly flow at the outlet end of the siphon drain pipe 200 is avoided. On the other hand, the problem that the siphon effect cannot be generated due to the influence of the water flow flowing out from the outlet end of the siphon drain pipe 200 and the water flow flowing out from the drain rear section 120 being opposite to each other, which affects the filling of the siphon drain pipe 200 and the drain rear section 120 with the water flow is also avoided.

In detail, the bending section 220 has an inverted U-shaped structure, one end of which is connected to the top end of the extension section 210, and the other end of which is connected to the drainage rear section 120 through an inclined portion extending obliquely. The inclined portion extends downwards from the other end of the bending section 220 and gradually approaches the drainage rear section 120, so as to form an inclined extending structure. Through the above structure, the siphon drain pipe 200 is smoothly connected with the drain rear section 120 of the main drain pipe 100, thereby reducing the resistance to water flow turning during siphon drainage, and ensuring that residual water in the water tank 300 can be sufficiently pumped out and drained by utilizing the siphon effect.

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

starting the drain pump 400, and allowing water in the water tank 300 to enter the main drain pipe 100 and the siphon drain pipe 200;

when the first setting condition is reached, the drainage front section 110 of the main drainage pipe 100 is cut off;

the drain pump 400 is turned off, and siphon drainage is performed through the siphon drain pipe 200 and the drain rear section 120 of the main drain pipe 100.

In the above-mentioned scheme, the drainage front section 110 of the main drain pipe 100 is cut off first in the drainage process of the dishwasher, and then the drain pump 400 is closed to perform siphon drainage, so that the backflow of water in the main drain pipe 100 to the sink 300 can be prevented when the drain pump 400 is closed, the state that the siphon drain pipe 200 and the drainage rear section 120 are 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 control the on-off of the drainage front section 110, the drainage device of the dishwasher in this embodiment further includes a first shut-off valve 101 provided on the drainage front section 110 of the main drain pipe 100. The dishwasher can control the on-off of the drain front 110 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 drainage front section 110 of the main drain pipe 100. Then, the drain pump 400 is turned on, and the water in the sump 300 is discharged along the main drain pipe 100 by the driving of the drain pump 400. When the first setting condition is reached, the first shut-off valve 101 is controlled to be closed, thereby shutting off the drain front stage 110, and then the drain pump 400 is turned off, so that siphon drainage along the siphon drain pipe 200 and the drain rear stage 120 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 drainage front 110, 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 and is not communicated with the main drain pipe 100, so that the problem that the washing water in the inner container 500 is pumped out 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.

Before the start of draining, the first stop valve 101 and the second stop valve 201 are controlled to be in an open state, 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 setting condition is reached, the first stop valve 101 is controlled to close and cut off the drainage front section 110, and then the drainage pump 400 is closed, so that siphon drainage can be realized through the siphon drainage pipe 200 and the drainage rear section 120. 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, 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 drain device of the dishwasher according to the present embodiment, the siphon drain 200 and the drain rear section 120 of the main drain 100 constitute a siphon structure. If the siphon drain pipe 200 and the drain rear section 120 of the main drain pipe 100 are filled with water flow during the washing of the dishwasher, a siphon effect is generated to gradually pump the washing water in the sump 300, and thus the washing water is not contained in the inner tub 500 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.

The main drain pipe 100 is mainly used for rapid drainage in the operation state of the drain pump 400, but has an upwardly extending drain front section 110 and a downwardly extending drain rear section 120, and has an inlet end higher than an outlet end, and may also be constructed as a siphon structure generating a siphon effect. Further, when the main drain pipe 100 is filled with water during washing, there is a possibility that the washing water in the sump 300 is drawn out along the main drain pipe 100 by a 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 connected to the drain outlet (i.e., the outlet end of the main drain pipe 100) inserted below the ground 600, and the siphon effect generated during the washing process can be avoided to pump out the washing water in the water tank 300.

In the preferred embodiment, the drainage front 110 of the main drain pipe 100 extends from the inlet end thereof in a horizontal direction for a certain distance and then extends vertically upward. Similarly, the siphon drain 200 also has a horizontal section 260 extending horizontally before the extension section 210, and the lower end of the extension section 210 is connected to the extension end of the horizontal section 260 (i.e., the left end of the horizontal section 260 in fig. 1). 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 siphon effect is generally not destroyed by the air entering the horizontal segment 260 (i.e. the rising segment is still filled with water flow), and only after the air enters the rising segment of the siphon drain 200, the siphon effect is destroyed, so that the water flow is reversed. 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 an area where the drainage front 110 horizontally extends. Similarly, the second shut-off valve 201 is disposed on the horizontal section 260 of the siphon drain 200. Cutting off the drain front section 110 of 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 is completely blocked by the second stop valve 201, effectively preventing the water flow from flowing back into the water tank 300.

Preferably, the main drain pipe 100 also has a drain end section 130 located below the ground 600 that is connected to the drain back section 120. The drain end section 130 extends in a horizontal or near horizontal direction, ultimately forming the outlet end of the main drain pipe 100 and communicates with the drain line in the user's home. The above scheme is directed to the installation position of the dish washer, especially the position of the drain rear section 120 of the main drain pipe 100 inserted into the ground 600 and the drain pipe of the user's home are also at a distance, ensuring that the outlet end of the main drain pipe 100 is lower than the inlet end of the siphon drain pipe 200, 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 the drainage pump, and performing siphon drainage on the siphon drainage pipe and the drainage rear section of the main 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 phenomenon that water flows backwards to the water tank 300 after the siphon effect is broken 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 includes a flow detection device provided on the siphon drain 200. 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 bottom end of the extension section 210. 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 and the drainage rear section of the main 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 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 the drainage pump, and performing siphon drainage on the siphon drainage pipe and the drainage rear section of the main 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 water tank 300, and the drain pump 400 can be opened in the initial stage of the drainage stage to drain 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 to ensure the drainage efficiency, thereby being beneficial to saving the drainage time. The siphon drain 200 and the drain rear section 120 of the main drain 100 communicate to form a siphon structure, which may generate a siphon effect when filled with the drain water flow. At the latter stage of the draining process, the draining front section 110 of the main draining pipe 100 is cut off, and then the draining pump 400 is turned off, so that the residual water in the water tank 300 can be drained by siphon effect. The cross-sectional area of the siphon drain pipe 200 is small, thereby ensuring a siphon effect and 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 the drainage pump, and performing siphon drainage on the siphon drainage pipe and the drainage rear section of the main 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 main drain pipe is provided with a drain front section communicated with the drain pump and at least partially extending upwards, and a drain rear section connected with the drain front section and extending downwards;

the inlet end of the siphon drain pipe is communicated with the drain pump, the outlet end of the siphon drain pipe is higher than the inlet end and is communicated to the drain rear section of the main drain pipe, and the cross section area of the siphon drain pipe is smaller than that of the main drain pipe;

the outlet end of the main drain pipe is lower than the inlet end of the siphon drain pipe, and the siphon drain pipe performs siphon drainage after the drain pump stops working.

2. The drain device of a dishwasher according to claim 1, wherein a junction of the front drain section and the rear drain section forms a highest position of the main drain pipe;

the siphon drain pipe is provided with an extension section extending upwards, so that the outlet end of the siphon drain pipe is connected with the upper area of the drain back section; the outlet end of the siphon drain pipe is lower than the highest position of the main drain pipe.

3. The drain device of a dishwasher according to claim 2, wherein the extension end of the extension section has a bent section bent downward, and the siphon drain pipe is connected to the drain rear section through the bent section.

4. The drain device of the dishwasher of claim 1, wherein a first shut-off valve is provided on a drain front section of the main drain pipe for controlling on-off of the drain front section; and a second stop valve is arranged on the siphon drain pipe and used for controlling the on-off of the siphon drain pipe.

5. The drainage device of a dishwasher of claim 4, wherein the drainage front section of the main drain pipe extends horizontally by a certain distance from the inlet end of the main drain pipe and then extends vertically upward, and the first shut-off valve is provided on an area where the drainage front section extends horizontally;

and/or the siphon drain pipe is provided with a horizontal section which is horizontally arranged in an extending way and an extending section which is upwards extended from the extending end of the horizontal section, and the second stop valve is arranged on the horizontal section of the siphon drain pipe.

6. The drain device of a dishwasher according to any one of claims 1 to 5, wherein a flow detection device is provided on the siphon drain.

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 a water tank enters a main drainage pipe and a siphon drainage pipe;

cutting off the front drainage section of the main drainage pipe when the first set condition is reached;

closing the drainage pump, and carrying out siphon drainage through the siphon drainage pipe and the drainage rear section of the main drainage 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 water level in the drain pump reaches zero and/or no water flow is detected in 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.