Drainage system of washing equipment and drainage method of washing equipment

Abstract

The invention discloses a drainage system of washing equipment and a drainage method of the washing equipment. The drainage system of the washing equipment comprises a drainage pipeline for drainage of the washing equipment, the drainage pipeline is provided with at least one switching valve and at least one filter, the switching valves and the filters are alternately connected to the drainage pipeline in series in the drainage direction of the drainage pipeline, and the switching valves are arranged on the upstream of the filters. The control device is used for controlling drainage of the drainage pipeline to be switched between filtering drainage and non-filtering drainage. The switching valves and the filters are alternately arranged in the drainage direction of the drainage pipeline, and the switching valves are arranged on the upstream of the filters, so that drainage of the drainage pipeline can be switched between filtered drainage and non-filtered drainage, the drainage modes of the drainage pipeline are diversified, pollutants of washing water discharged by the drainage pipeline are reduced, and meanwhile, the drainage efficiency of the drainage pipeline is improved. And the speed of draining washing water by the drainage pipeline can be accelerated.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and in particular, relates to a drainage system and a drainage method for a washing device. Background Art

[0002] When washing clothes, due to the friction between clothes and between clothes and the washing machine itself, the clothes will produce lint and mix into the washing water, making the washing water become sewage. The washing machine's drainage pipe is generally equipped with a filter device to filter the lint before the sewage is discharged, which can avoid the situation where the sewer is blocked by direct discharge of sewage. Even if the sewer is not blocked, the direct discharge of sewage will cause environmental pollution. In addition, valuables that fall from the clothes can also be blocked by the filter device to avoid unnecessary losses.

[0003] In the prior art, the drainage pipe of the washing machine is generally only provided with a filtering device, and all sewage discharged from the drainage pipe of the washing machine must be filtered by the filtering device before being discharged. However, if sewage that can be discharged directly needs to be filtered by the filtering device before being discharged, the speed of discharging washing water from the drainage pipe will be reduced.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a drainage system and a drainage method for washing equipment. By alternately arranging the switching valve and the filter along the drainage direction of the drainage pipeline and arranging the switching valve upstream of the filter, the drainage of the drainage pipeline can be switched between filtered drainage and non-filtered drainage, thereby diversifying the drainage mode of the drainage pipeline, achieving the purpose of reducing pollutants in the washing water discharged from the drainage pipeline and accelerating the speed of washing water discharged from the drainage pipeline.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] The present invention provides a drainage system for washing equipment, comprising a drainage pipeline for draining water from the washing equipment, wherein at least one switching valve and at least one filter are arranged on the drainage pipeline, the switching valve and the filter are alternately connected in series on the drainage pipeline along the drainage direction of the drainage pipeline, and the switching valve is arranged upstream of the filter to control the drainage of the drainage pipeline to switch between filtered drainage and non-filtered drainage.

[0008] Furthermore, a first switching valve, a second switching valve, a first filter and a second filter are provided on the drainage pipeline, and the first switching valve, the first filter, the second switching valve and the second filter are arranged in sequence along the drainage direction of the drainage pipeline.

[0009] Furthermore, the first switching valve and the second switching valve are three-position four-way switching valves;

[0010] The first switching valve has a first position in which the water is filtered and discharged through the first filter, a second position in which the water bypasses the first filter and is directly discharged, and a third position in which the water flows reversely through the first filter and is backwashed and discharged;

[0011] The second switching valve has a first position in which the water is filtered and discharged through the second filter, a second position in which the water bypasses the second filter and is directly discharged, and a third position in which the water flows reversely through the second filter and is backwashed and discharged.

[0012] Furthermore, a reversing valve is provided downstream of the filter at the end of the drainage pipeline, the water inlet of the reversing valve is connected to the drainage pipeline, the first water outlet of the reversing valve is used to communicate with the washing equipment, and the second water outlet of the reversing valve is connected to the outside atmosphere;

[0013] Preferably, the drainage pipeline is further provided with a drainage pump located upstream of the first switching valve.

[0014] The present invention also provides a control method for a washing device. The drainage system of the washing device provided by the above technical solution is adopted. During the drainage process of the washing device, a filtering drainage program and / or a non-filtering drainage program can be executed to drain the washing device.

[0015] Further, when each switching valve is in the first position, the washing equipment performs a filtering drainage program; the non-filtering drainage program is a direct drainage program or a backwashing drainage program, when each switching valve is in the second position, the washing equipment performs a direct drainage program, and when each switching valve is in the third position, the washing equipment performs a backwashing drainage program;

[0016] During the drainage process of the washing equipment, if it is detected that the first turbidity value of the washing water upstream of the first switching valve is greater than the first set value, the first switching valve is controlled to drain at the first station; if it is simultaneously detected that the second turbidity value of the washing water upstream of the second switching valve is greater than the second set value and less than the first set value, the second switching valve is controlled to drain at the first station.

[0017] Further, if it is detected that the first turbidity value is greater than the first set value and the second turbidity value is less than or equal to the second set value, the first switching valve is controlled to drain water at the first station and the second switching valve is controlled to drain water at the second station or the third station;

[0018] If it is detected that the first turbidity value is less than or equal to the first set value, the first switching valve and the second switching valve are controlled to drain water at the second station or the third station respectively.

[0019] Furthermore, after the first switching valve and the second switching valve drain water at the first station, if it is detected that the blockage degree of the first filter and / or the second filter is greater than the set degree, the first switching valve and / or the second switching valve is controlled to switch from the first station to the second station or the third station for drainage.

[0020] Furthermore, after controlling the first switching valve and / or the second switching valve to switch from the first position to the third position for drainage, if it is detected after a set time that the blockage degree of the first filter and / or the second filter is still greater than the set degree, the first switching valve and / or the second switching valve is controlled to switch from the third position to the second position for drainage.

[0021] Furthermore, when the first switching valve and the second switching valve are simultaneously draining water at the first station, if it is detected that the turbidity of the washing water downstream of the second filter is less than or equal to the third set value, and the third set value is less than the second set value, the reversing valve is controlled to be connected to the washing equipment;

[0022] When the first switching valve and the second switching valve are simultaneously draining water at the second station, the reversing valve is controlled to be connected with the washing equipment.

[0023] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0024] By alternately arranging the switching valve and the filter along the drainage direction of the drainage pipe and arranging the switching valve upstream of the filter, the drainage of the drainage pipe can be switched between filtered drainage and non-filtered drainage, thereby diversifying the drainage method of the drainage pipe, while reducing the pollutants in the washing water discharged from the drainage pipe and speeding up the discharge of the washing water from the drainage pipe.

[0025] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0027] Figure 1 Schematic diagram of a drainage system of a washing device in which a first switching valve and a second switching valve are respectively provided at a first station according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of a drainage system of a washing device in which a first switching valve and a second switching valve are respectively provided at a second station according to an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of a first switching valve and a second switching valve provided by an embodiment of the present invention respectively having a first working position, a second working position and a third working position;

[0030] Figure 4 It is a flow chart of a drainage method for a washing device provided in an embodiment of the present invention.

[0031] Icons: 1- housing; 2- water cylinder; 3- water inlet pipe; 4- drainage pipe; 41- drainage pump; 42- first filter; 43- second filter; 44- first switching valve; 45- second switching valve; 46- reversing valve; 5- circulating water circuit.

[0032] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 and Figure 2As shown, the present invention provides a drainage system for a washing device, including a drainage pipeline 4 for draining water from the washing device, wherein the drainage pipeline 4 is provided with at least one switching valve and at least one filter, the switching valve and the filter are alternately connected in series to the drainage pipeline 4 along the drainage direction of the drainage pipeline 4, and the switching valve is arranged upstream of the filter, for controlling the drainage of the drainage pipeline 4 to switch between filtered drainage and non-filtered drainage.

[0037] In an embodiment of the present invention, the switching valve and the filter are alternately arranged along the drainage direction of the drainage pipe 4, and the switching valve is arranged upstream of the filter, so that the drainage of the drainage pipe 4 can be switched between filtered drainage and non-filtered drainage, thereby diversifying the drainage mode of the drainage pipe 4, while reducing the pollutants in the washing water discharged from the drainage pipe 4 and speeding up the speed of discharging the washing water from the drainage pipe 4.

[0038] The washing device can be a washing machine or a dishwasher. When the washing device is a washing machine, for example, when the washing device is a drum washing machine, the drum washing machine includes a casing 1, an outer drum arranged in the casing 1, and an inner drum rotatably arranged in the outer drum. The outer drum is a water tub. A drain port is arranged at the bottom of the outer drum. A drain pipe 4 is connected in series to the drain port. The water outlet end of the drain pipe 4 passes through the casing 1 and is connected to the outside atmosphere. The water inlet of the water tub is arranged on the water inlet pipe 3, which is used to fill water into the water tub.

[0039] Each filter corresponds to a switching valve located upstream of the filter. The switching valve is used to control whether the drainage of the drainage pipeline 4 is filtered through the filter downstream of the switching valve. If the drainage is filtered through the filter downstream of the switching valve, the drainage of the drainage pipeline 4 is filtered drainage. If the drainage is not filtered through the filter downstream of the switching valve, the drainage of the drainage pipeline 4 is filtered drainage.

[0040] When a filter and a switching valve are provided on the drainage pipeline 4, the drainage process of the drainage pipeline 4 is either only a filtering drainage process or only a non-filtering drainage process;

[0041] When more than two filters and more than two switching valves are provided on the drainage pipeline 4, there are only filtering drainage process in the drainage pipeline 4; only non-filtering drainage process; filtering drainage process first and then non-filtering drainage process; non-filtering drainage process first and then filtering drainage process.

[0042] In an embodiment of the present invention, a first switching valve 44, a second switching valve 45, a first filter 42 and a second filter 43 are provided on the drainage pipe 4, and the first switching valve 44, the first filter 42, the second switching valve 45 and the second filter 43 are arranged in sequence along the drainage direction of the drainage pipe 4.

[0043] In the embodiment of the present invention, the above arrangement realizes that the first switching valve 44 is used to control whether the drainage of the drainage pipeline 4 is filtered through the first filter 42, and the second switching valve 45 is used to control whether the drainage of the drainage pipeline 4 is filtered through the second filter 43;

[0044] Specifically, the first switching valve 44 and the second switching valve 45 are three-position four-way switching valves;

[0045] The first switching valve 44 has a first position in which the water is filtered and discharged through the first filter 42, a second position in which the water bypasses the first filter 42 and is directly discharged, and a third position in which the water flows reversely through the first filter 42 and is backwashed and discharged;

[0046] The second switching valve 45 has a first position where the water is filtered and discharged through the second filter 43, a second position where the water bypasses the second filter 43 and is directly discharged, and a third position where the water flows reversely through the second filter 43 and is backwashed and discharged.

[0047] When the first switching valve 44 and the second switching valve 45 are in the first position, the drainage of the drainage pipe 4 is controlled to be filtered drainage filtered by the first filter 42 and the second filter 43, which can achieve double filtration of the washing water and reduce pollutants in the washing water. When one filter is blocked, damaged, etc., the drainage system of the present application still has a filtering function.

[0048] The non-filtered drainage may be non-filtered drainage that bypasses the filter for direct discharge, or non-filtered drainage that flows in reverse through the first filter 42 for backwash discharge;

[0049] When the first switching valve 44 and the second switching valve 45 are in the second position, the drainage of the drainage pipeline 4 is controlled to be non-filtered drainage that has not been filtered by the first filter 42 and the second filter 43, which belongs to direct discharge, avoids the filtering step, and can increase the drainage speed.

[0050] When the first switching valve 44 and the second switching valve 45 are in the third position, the drainage of the drainage pipeline 4 is controlled to be non-filtered drainage that has not been filtered by the first filter 42 and the second filter 43, which belongs to backwashing discharge; backwashing the filter can remove the dirt trapped in the filter layer and restore the filtering capacity of the filter.

[0051] like Figure 3 As shown, position a represents the first station, position b represents the second station, and position c represents the third station.

[0052] For example, when the first switching valve 44 is in the first position and the second switching valve 45 is in the first position, the drainage process of the drainage pipe 4 only has the filtering drainage process; when the first switching valve 44 is in the second position and the second switching valve 45 is in the second position, the drainage process of the drainage pipe 4 only has the direct drainage process; when the first switching valve 44 is in the first position and the second switching valve 45 is in the second position, the drainage process of the drainage pipe 4 has the filtering drainage process and the direct drainage process; when the first switching valve 44 is in the third position and the second switching valve 45 is in the first position, the drainage process of the drainage pipe 4 has the backwashing drainage process and the filtering drainage process.

[0053] In the embodiment of the present invention, a reversing valve 46 is provided downstream of the filter at the end of the drainage pipeline 4, the water inlet of the reversing valve 46 is connected to the drainage pipeline 4, the first water outlet of the reversing valve 46 is used to communicate with the washing equipment, and the second water outlet of the reversing valve 46 is connected to the outside atmosphere;

[0054] In the embodiment of the present invention, when the first filter 42 and the second filter 43 are provided on the drainage pipeline 4, the second filter 43 is the filter at the end of the drainage pipeline 4;

[0055] The drainage pipeline 4 is provided with a reversing valve 46 downstream of the second filter 43. The reversing valve 46 is arranged in the housing 1. The reversing valve 46 has a water inlet and two drainage outlets. The reversing valve 46 divides the drainage pipeline 4 into a first drainage section and a second drainage section. All switching valves and all filters are arranged on the first drainage section. The water outlet of the second drainage section passes through the housing 1 and is connected to the outside atmosphere. The water outlet of the first drainage section is connected to the water inlet of the reversing valve 46. The first drainage outlet of the reversing valve 46 is connected to the water storage drum 2 of the washing machine through the circulating water circuit 5. The water inlet of the second drainage section is connected to the second drainage outlet of the reversing valve 46. The setting of the circulating water circuit 5 can reuse the water discharged from the washing machine, which can save water resources.

[0056] While the drainage pipe 4 discharges the washing water, the circulation pipe can send the washing water that meets the standards into the water storage drum 2 to realize the circulation of the washing water. The washing water is reused. When the turbidity of the water in the water storage drum 2 is less than the set turbidity, or the first turbidity value described below changes from being greater than the first set value to being less than or equal to the first set value, the circulation of the washing water is stopped;

[0057] Of course, a water storage device may be provided outside the water holding drum 2 , and the water outlet of the circulating water circuit 5 is connected to the water storage device, and the water storage device stores washing water for the water holding drum 2 .

[0058] In addition, a drain pump 41 is provided upstream of the switching valve at the front end of the drain pipe 4. Specifically, the drain pump 41 is provided upstream of the first switching valve 44. When the drain pump 41 is turned on, the washing water in the water storage drum 2 reaches the first switching valve 44 through the drain pump 41. When the drain pump 41 is turned off, the washing water in the water storage drum 2 is stopped from being discharged.

[0059] like Figure 4 As shown, the present invention provides a drainage method for a washing device, which adopts the drainage system for the washing device provided by the above technical solution. During the drainage process of the washing device, a filtering drainage program and / or a non-filtering drainage program can be executed to drain the washing device.

[0060] In an embodiment of the present invention, during the process of draining the washing equipment, it is possible to choose to execute only the filtering drainage program, only the non-filtering drainage program, or both the filtering drainage program and the non-filtering drainage program, thereby selecting the drainage program according to actual conditions. While ensuring that the discharge of detergent water meets the standards, the drainage efficiency can be improved.

[0061] In the embodiment of the present invention, when each switching valve is in the first position, the washing equipment performs a filtering drainage program; the non-filtering drainage program is a direct drainage program or a backwashing drainage program, when each switching valve is in the second position, the washing equipment performs a direct drainage program, and when each switching valve is in the third position, the washing equipment performs a backwashing drainage program;

[0062] During the drainage process of the washing equipment, if it is detected that the first turbidity value of the washing water upstream of the first switching valve 44 is greater than the first set value, the first switching valve 44 is controlled to drain water at the first station. If it is detected that the second turbidity value of the washing water upstream of the second switching valve 45 is greater than the second set value and less than the first set value, the second switching valve 45 is controlled to drain water at the first station. The first set value is Figure 4 The first setting value is Figure 4 The setting value 2 in .

[0063] Initially, the first switching valve 44 and the second switching valve 45 are respectively in the second position. Specifically, the drain pump 41 is turned on. If the detected first turbidity value is greater than the first set value, it means that the washing water is highly polluted and the first filter 42 is required to filter the drainage of the drainage pipe 4. Then the first switching valve 44 is switched to the first position. At the same time, it is detected that the second turbidity value is greater than the second set value and less than the first set value, which means that the first filter 42 has effectively filtered the washing water. However, the filtering capacity of the first filter 42 may be reduced or some pollutants of certain volume sizes cannot be filtered, resulting in a high degree of pollution in the washing water. The second filter 43 is required to filter the drainage of the drainage pipe 4 again. Then the second switching valve 45 is switched to the second position. The first switching valve 44 and the second switching valve 45 are respectively in the first position to drain the washing equipment until the drainage is completed. After the drainage is completed, the drain pump 41 is turned off. The first switching valve 44 and the second switching valve 45 are switched from the first position to the second position to prevent external pollutants from contaminating the first filter 42 and the second filter 43, so that only the filtering and drainage procedures are executed during the drainage process.

[0064] The filtering levels of the first filter 42 and the second filter 43 may be the same or different. When the filtering levels of the first filter 42 and the second filter 43 are different, impurities of different volumes can be filtered in stages.

[0065] Further, if it is detected that the first turbidity value is greater than the first set value and the second turbidity value is less than or equal to the second set value, the first switching valve 44 is controlled to drain water at the first station and the second switching valve 45 is controlled to drain water at the second station or the third station.

[0066] On the basis that the first turbidity value is greater than the first set value, if the second turbidity value is less than or equal to the second set value, it means that the first filter 42 has effectively filtered the washing water, and the filtering capacity of the first filter 42 has not decreased or the first filter 42 can filter pollutants of various volume sizes, the degree of dirtiness of the washing water is relatively small, and meets the emission standards, and there is no need for the second filter 43 to filter the washing water again. The second switching valve 45 can be switched in the second position or from the second position to the third position, so that not only the filtering drainage procedure but also the direct drainage procedure is executed during the drainage process.

[0067] Further, if it is detected that the first turbidity value is less than or equal to the first set value, the first switching valve 44 and the second switching valve 45 are controlled to drain water at the second station or the third station respectively.

[0068] The first turbidity is less than the first set value, indicating that the washing water is less dirty and meets the discharge standard. Therefore, the first switching valve 44 and the second switching valve 45 directly discharge the washing water at the second station, so that only the direct drainage procedure is executed during the discharge process.

[0069] The drainage process of the washing machine includes a washing drainage stage, a rinsing drainage stage and a dehydration drainage stage. In the washing drainage stage, the first turbidity value is greater than the first set value, the first switching valve 44 is in the first position, the second turbidity value is greater than the second set value and less than the first set value, the second switching valve 45 is in the first position, the second turbidity value is less than or equal to the second set value, and the second switching valve 45 is in the second position;

[0070] The first turbidity value is less than or equal to the first set value, and the first switching valve 44 and the second switching valve 45 are in the second position;

[0071] During the rinsing and draining stage, at least one of the first switching valve 44 and the second switching valve 45 is at the first position; during the dehydration and draining stage, the first switching valve 44 and the second switching valve 45 are respectively at the second position.

[0072] It should be noted that if the filter is clogged during the washing or rinsing drainage process, the switching valve is switched to the third position.

[0073] In an embodiment of the present invention, after the first switching valve 44 and the second switching valve 45 drain water at the first station, if it is detected that the blockage degree of the first filter 42 and / or the second filter 43 is greater than the set degree, the first switching valve 44 and / or the second switching valve 45 is controlled to switch from the first station to the second station or the third station for drainage.

[0074] In the embodiment of the present invention, when the filter is clogged during filtering and draining water, the switching valve can be switched from the first position to the third position so that the drainage of the drainage pipeline 4 can backwash the filter, or in order to cope with an emergency, the switching valve can be switched from the first position to the second position so that the washing water of the drainage pipeline 4 can be directly discharged;

[0075] If the first filter 42 is clogged, the first switching valve 44 switches from the first position to the third position for backwashing, and the second switching valve 45 still filters the washing water at the first position;

[0076] If the second filter 43 is clogged, the first switching valve 44 still filters the washing water at the first station, and the second switching valve 45 switches from the first station to the third station for backwashing;

[0077] If the first filter 42 and the second filter 43 are blocked respectively, the first switching valve 44 is switched from the first station to the third station for backwashing, and the second switching valve 45 is switched from the first station to the third station for backwashing. Since the backwashing time is not long, the water discharged to the outside after backwashing can be collected. By detecting the turbidity of the collected washing water, it is determined whether to reuse or filter again.

[0078] Furthermore, after controlling the first switching valve 44 and / or the second switching valve 45 to switch from the first station to the third station for drainage, if it is detected after the set time that the blockage degree of the first filter 42 and / or the second filter 43 is still greater than the set degree, the first switching valve 44 and / or the second switching valve 45 is controlled to switch from the third station to the second station for drainage.

[0079] If the blockage degree of the first filter 42 and / or the second filter 43 cannot be alleviated after the set time, the first switching valve 44 and / or the second switching valve 45 is switched from the third position to the second position to discharge the washing water in the drainage pipe 4 directly to the outside.

[0080] In an embodiment of the present invention, when the first switching valve 44 and the second switching valve 45 are draining water at the first station at the same time, if it is detected that the turbidity of the washing water downstream of the second filter 43 is less than or equal to the third set value, and the third set value is less than the second set value, the reversing valve 46 is controlled to be connected to the washing equipment.

[0081] In the embodiment of the present invention, when the reversing valve 46 is in the first position, the first water outlet of the reversing valve 46 is connected to the water drum 2 of the washing device, and when the reversing valve 46 is in the second position, the second water outlet of the reversing valve 46 is connected to the outside atmosphere;

[0082] If it is detected that the turbidity of the washing water discharged from the second filter 43 is less than or equal to the third turbidity value, it means that the washing water is slightly dirty and can be reused by the water storage drum 2, and the reversing valve 46 is in the first position; if it is detected that the turbidity of the washing water discharged from the second filter 43 is greater than the third set value and less than the second set value, it means that the washing water is slightly dirty but cannot be reused by the water storage drum 2, and the reversing valve 46 is in the second position. Initially, the reversing valve 46 is in the second position;

[0083] Furthermore, when the first switching valve 44 and the second switching valve 45 are simultaneously draining water at the second station, the control reversing valve 46 is connected to the washing equipment;

[0084] When the first switching valve 44 and the second switching valve 45 are both in the second position, it means that the washing water is slightly dirty and can be reused in the water holding drum 2, and the switching valves are in the first position.

[0085] In addition, when the first turbidity value is greater than the first set value and exceeds the maximum set value, the first switching valve 44 and the second switching valve 45 are operated alternately at the first station and the third station, that is, filtration and backwashing are performed alternately to prevent the filtration capacity of the first filter 42 and the second filter 43 from being reduced.

[0086] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A drainage system for a washing device, comprising a drainage pipeline for draining water from the washing device, characterized in that: At least one switching valve and at least one filter are provided on the drainage pipeline. The switching valve and the filter are alternately connected in series on the drainage pipeline along the drainage direction of the drainage pipeline, and the switching valve is provided upstream of the filter to control the drainage of the drainage pipeline to switch between filtered drainage and non-filtered drainage.

2. The drainage system according to claim 1, characterized in that: A first switching valve, a second switching valve, a first filter and a second filter are arranged on the drainage pipeline. The first switching valve, the first filter, the second switching valve and the second filter are arranged in sequence along the drainage direction of the drainage pipeline.

3. The drainage system according to claim 2, characterized in that: The first switching valve and the second switching valve are three-position four-way switching valves; The first switching valve has a first position in which the water is filtered and discharged through the first filter, a second position in which the water bypasses the first filter and is directly discharged, and a third position in which the water flows reversely through the first filter and is backwashed and discharged; The second switching valve has a first position in which the water is filtered and discharged through the second filter, a second position in which the water bypasses the second filter and is directly discharged, and a third position in which the water flows reversely through the second filter and is backwashed and discharged.

4. The drainage system according to claim 3, characterized in that: A reversing valve is provided downstream of the filter at the end of the drainage pipeline, the water inlet of the reversing valve is connected to the drainage pipeline, the first water outlet of the reversing valve is used to connect to the washing equipment, and the second water outlet of the reversing valve is connected to the outside atmosphere; Preferably, a drainage pump is provided upstream of the switching valve at the front end of the drainage pipeline.

5. A method for draining water from a washing device, characterized in that: By using the drainage system for washing equipment as described in any one of claims 1 to 4, during the drainage process of the washing equipment, a filtering drainage procedure and / or a non-filtering drainage procedure can be executed to drain the washing equipment.

6. The drainage method according to claim 5, characterized in that: When each switching valve is in the first position, the washing equipment performs a filtering drainage procedure; the non-filtering drainage procedure is a direct drainage procedure or a backwashing drainage procedure; when each switching valve is in the second position, the washing equipment performs a direct drainage procedure; when each switching valve is in the third position, the washing equipment performs a backwashing drainage procedure; During the drainage process of the washing equipment, if it is detected that the first turbidity value of the washing water upstream of the first switching valve is greater than the first set value, the first switching valve is controlled to drain at the first station; if it is simultaneously detected that the second turbidity value of the washing water upstream of the second switching valve is greater than the second set value and less than the first set value, the second switching valve is controlled to drain at the first station.

7. The drainage method according to claim 6, characterized in that: If it is detected that the first turbidity value is greater than the first set value and the second turbidity value is less than or equal to the second set value, the first switching valve is controlled to drain water at the first station and the second switching valve is controlled to drain water at the second station or the third station; If it is detected that the first turbidity value is less than or equal to the first set value, the first switching valve and the second switching valve are controlled to drain water at the second station or the third station respectively.

8. The drainage method according to claim 6, characterized in that: After the first switching valve and the second switching valve drain water at the first station, if it is detected that the blockage degree of the first filter and / or the second filter is greater than the set degree, the first switching valve and / or the second switching valve is controlled to switch from the first station to the second station or the third station for drainage.

9. The drainage method according to claim 8, characterized in that: After controlling the first switching valve and / or the second switching valve to switch from the first position to the third position for drainage, if it is detected after the set time that the blockage degree of the first filter and / or the second filter is still greater than the set degree, the first switching valve and / or the second switching valve is controlled to switch from the third position to the second position for drainage.

10. The drainage method according to any one of claims 5 to 9, characterized in that: When the first switching valve and the second switching valve are simultaneously draining water at the first station, if it is detected that the turbidity of the washing water downstream of the second filter is less than or equal to the third set value, and the third set value is less than the second set value, the reversing valve is controlled to be connected to the washing equipment; When the first switching valve and the second switching valve are simultaneously draining water at the second station, the reversing valve is controlled to be connected with the washing equipment.

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