CN216891638U

CN216891638U - Circulating pipe for washing machine and washing machine

Info

Publication number: CN216891638U
Application number: CN202120342748.5U
Authority: CN
Inventors: 陈小平; 蔡晨曦; 刘军
Original assignee: Yunmi Internet Technology Guangdong Co Ltd
Current assignee: Yunmi Internet Technology Guangdong Co Ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2022-07-05
Anticipated expiration: 2031-02-05

Abstract

The present invention relates to a circulation duct for a washing machine, comprising: the circulating inlet is connected with a drain pipe of the outer barrel of the washing machine, and washing water in the outer barrel enters the circulating pipe from the circulating inlet to form circulating water; the circulating outlet is connected with a water inlet of the outer barrel of the washing machine, and circulating water in the circulating pipe is sent into the outer barrel through the circulating outlet; a TOC sensor is fixedly arranged on the circulating pipe, and a detection part of the TOC sensor is positioned in the circulating pipe and contacts with circulating water in the circulating pipe to detect the TOC value of the circulating water; the TOC sensor has a simple installation structure, can accurately acquire the TOC value of the circulating water, and simultaneously relates to a corresponding washing machine.

Description

Circulating pipe for washing machine and washing machine

Technical Field

The utility model relates to the field of circulating water detection structures for washing machines, in particular to a circulating pipe for a washing machine and the washing machine.

Background

The washing machine generally adopts turbidity to judge the turbidity in the washing water so as to indicate whether clothes are washed clean or not, namely a turbidity sensor is adopted to measure the turbidity in the washing water, and the turbidity sensor represents the degree of light transmission obstruction of suspended substances in water, so that the detection effect on insoluble substances in water is good; however, in the washing process, not only insoluble substances but also a plurality of washing liquids (surfactants) and dirt (organic additives) attached to the objects to be washed exist in water, so that the measured turbidity cannot completely represent the cleanness degree of the clothes; in addition, some washing machines in the prior art use washing water to wash clothes in a circulating manner, but because dirt remains in a washing drum or the clothes are more dirty, the washing is not beneficial to washing due to the adoption of the washing water in a circulating manner, the washing efficiency is reduced, and the spraying blockage caused by spraying in some washing machines adopting circulating spraying washing is also caused. Therefore, a new circulating pipe and a washing machine which can monitor the water quality of circulating water are needed, and the water quality condition of the circulating water can be accurately displayed, so that the requirement of the existing life on the washing quality is met.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a circulating pipe for a washing machine and the washing machine.

The technical scheme of the utility model is summarized as follows:

the present invention provides a circulation duct for a washing machine, comprising:

the circulating inlet is connected with a drain pipe of the outer barrel of the washing machine, and washing water in the outer barrel enters the circulating pipe from the circulating inlet to form circulating water;

the circulating outlet is connected with a water inlet of the outer barrel of the washing machine, and circulating water in the circulating pipe is sent into the outer barrel through the circulating outlet;

the circulating pipe is fixedly provided with a TOC sensor, and a detection part of the TOC sensor is positioned in the circulating pipe and contacts with circulating water in the circulating pipe to detect the TOC value of the circulating water.

Preferably, the circulating pipe comprises a main pipe and a mounting branch pipe for accommodating the TOC sensor, and the mounting branch pipe is arranged on the pipe wall of the main pipe and communicated with the main pipe; when the TOC sensor is installed on the installation branch pipe, the detection part is positioned in the main pipe.

Preferably, the circulating pipe further comprises a circulating pump for providing circulating water power; the main pipeline comprises a first main pipeline and a second main pipeline; the circulating inlet is positioned in the first main pipeline, and the inlet of the circulating pump is communicated with the outer barrel drain pipe through the first main pipeline; the circulating outlet is positioned on the second main pipeline, and the outlet of the circulating pump is communicated with the water inlet of the outer barrel through the second main pipeline; the installation branch pipe is arranged on the first main pipe.

Preferably, the TOC sensor further comprises a base, the detection part is arranged at one end of the base, and when the TOC sensor is installed in the installation branch pipe, the base is accommodated in the installation branch pipe and is in fixed sealing fit with the inner side wall of the installation branch pipe.

Preferably, the side wall of the base body is provided with a plurality of convex rings so as to form a seal with the inner side wall of the mounting branch pipe when the TOC sensor is mounted on the mounting branch pipe.

Preferably, the other end of the base body, which is far away from the detection part, is provided with a cover body; the size of the cover body is larger than the inner diameter of the mounting branch pipe, and when the TOC sensor is fixedly mounted in the mounting branch pipe, the cover body is positioned outside the pipe orifice of the mounting branch pipe and is in sealing fit with the pipe orifice of the mounting branch pipe.

Preferably, the lid sets up the locating pin near installation branch pipe department, the installation branch pipe mouth of pipe sets up the constant head tank, when the TOC sensor is installed in the installation branch pipe, locating pin and constant head tank cooperation for the installation location of TOC sensor.

Preferably, a transmission connecting part is arranged at one end of the cover body, which is far away from the base body, so as to be used for transmitting signal data detected by the TOC sensor and supplying power for the TOC sensor.

Preferably, the detecting part of the TOC sensor comprises an ultraviolet emitting end, a receiving end and a detection water area between the emitting end and the receiving end; the transmitting end transmits ultraviolet signals, the ultraviolet signals are absorbed by circulating water in the detected water area, and the receiving end receives the residual ultraviolet signals so as to provide signals for the washing machine signal processing module to process to obtain the circulating water TOC value.

Preferably, when the TOC sensor is installed in the through hole, the transmitting end, the detection water area and the receiving end are arranged along the flowing direction of circulating water in the vertical circulating pipe.

The utility model also provides a washing machine, which comprises a washing machine shell, a washing drum arranged in the washing machine shell and the circulating pipe; the washing drum comprises an outer drum and a rotatable inner drum in the outer drum, the inner drum is used for accommodating washing objects, and washing water can flow in the inner drum and the outer drum; when the washing machine circularly washes, the TOC sensor on the circulating pipe detects the TOC value of the circulating water.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides a circulating pipe for a washing machine and the washing machine, wherein a TOC sensor is arranged on the circulating pipe, when washing water enters the circulating pipe, the TOC sensor can detect the TOC value of the circulating water, the content of organic matters in the circulating water is reflected through TOC (total organic carbon), the quality of the circulating water in the washing process can be objectively displayed, and a subsequent washing program can optimize circulating washing according to the TOC value; for example, in the main washing, a circulating spraying mode is adopted, and whether spraying is carried out or not is determined according to a circulating water TOC value obtained by a TOC sensor on a circulating pipe; if the TOC value of the circulating water is detected to meet the requirement in the rinsing process, the rinsing water can be continuously and circularly washed; the TOC sensor is simple in mounting structure and can accurately acquire the TOC value of circulating water.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:

FIG. 1 is a schematic perspective view of a circulation duct for a washing machine according to the present invention in cooperation with an outer tub of the washing machine;

FIG. 2 is a schematic view showing an exploded structure of a TOC sensor and a circulation pipe in the circulation pipe for the washing machine according to the present invention;

FIG. 3 is an enlarged view illustrating the structure of the TOC sensor and the circulation duct in the circulation duct for the washing machine according to the present invention;

FIG. 4 is a schematic cross-sectional view illustrating a TOC sensor and a circulation pipe in a circulation pipe for a washing machine according to the present invention;

FIG. 5 is a schematic view showing the structure of a TOC sensor in a circulation duct for a washing machine according to the present invention;

fig. 6 is an external structural view of a washing machine according to the present invention.

Description of reference numerals:

1-TOC sensor; 11-a transmitting end; 12-a receiving end; 13-a substrate; 14-positioning pins; 15-a convex ring; 16-a transmission connection; 17-detection of water area; 18-a cover body;

2-a circulation pipe; 21-a first main pipe; 22-a second main conduit; 23-installing branch pipes; 24-a positioning groove; 25-installing the inner side wall of the branch pipe; 27-a circulation pump; 28-recycle inlet; 29-a recycle outlet;

3-outer cylinder;

4-washing machine shell.

Detailed Description

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, which will enable those skilled in the art to practice the present invention with reference to the accompanying specification. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and generally are not intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict. It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

The present invention provides a circulation duct for a washing machine, as shown in fig. 1, 4, 5, comprising: a circulating inlet 28 connected with a drainpipe of the outer cylinder of the washing machine, wherein the washing water in the outer cylinder enters the circulating pipe 2 from the circulating inlet 28 to form circulating water; a circulating outlet 29 connected with the water inlet of the outer cylinder of the washing machine, and circulating water in the circulating pipe 2 is sent into the outer cylinder from the circulating outlet 29; the circulating pipe 2 is fixedly provided with a TOC sensor 1, and a detection part of the TOC sensor 1 is positioned in the circulating pipe and contacts with circulating water in the circulating pipe to detect the TOC value of the circulating water.

A detection section as shown in the figure taking a transmitting end 11 and a receiving end 12 as an example; the TOC sensor 1 is arranged on the circulating pipe 2, a detection part (an emitting end 11 and a receiving end 12) of the TOC sensor 1 can be in contact with circulating water in the circulating pipe 2, when circulating washing is adopted in the washing process, the TOC value of the circulating water can be quickly and effectively obtained, the content of organic matters in the circulating water is reflected through TOC (total organic carbon), the quality of the circulating water in the washing process can be objectively displayed, and the subsequent washing program can optimize the circulating washing according to the TOC value; for example, in the main washing, a circulating spraying mode is adopted, and whether spraying is carried out or not is determined according to a circulating water TOC value obtained by a TOC sensor on a circulating pipe; if the TOC value of the circulating water is detected to meet the requirement in the rinsing process, the rinsing water can be continuously and circularly washed; the TOC sensor has a simple mounting structure, and can accurately acquire the TOC value of circulating water; the TOC is a detection mode for detecting the total carbon content of organic matters in water, can accurately reflect the content of the organic matters in the water, can detect suspended organic matters, can detect most of common pigments, food stains, organic additives and detergents which are water-soluble organic matters, can reflect the dirt amount of circulating water through the TOC detection, and is used for judging whether the circulating water can be beneficial to circulating washing or not.

In some embodiments, as shown in fig. 1, 2, 3 and 4, the circulation pipe 2 comprises a main pipe and a mounting branch pipe 23 for accommodating the TOC sensor 1, the mounting branch pipe 23 being provided on a pipe wall of the main pipe to communicate with the main pipe; when the TOC sensor 1 is arranged on the mounting branch pipe 23, the detection part is positioned in the main pipe; be used for installing TOC sensor 1 through setting up specific installation branch pipe on the trunk line of circulating pipe 2, can reduce the part processing difficulty of circulating pipe, effectively guarantee the construction of circulating pipe simple and leakproofness, as shown in FIG. 2, use the first trunk line 21 of trunk line as the example, first trunk line 21 belongs to the circulating line, the circulation circulating water, installation branch pipe 23 can be the side direction and set up in first trunk line 21, can adopt the design of current tee bend pipeline, the length of installation branch pipe 23, the structure matches with the TOC sensor, can be used for holding the TOC sensor, make TOC sensor seal installation behind installation branch pipe 23, the detection part is located first trunk line 21, detect the TOC value of the circulating water in the first trunk line 21.

In some embodiments, as shown in fig. 1 and 2, the circulation pipe further comprises a circulation pump 27 for providing circulation water power; the main pipes comprise a first main pipe 21 and a second main pipe 22; the circulating inlet 28 is positioned on the first main pipe 21, and the inlet of the circulating pump 27 is communicated with the outer barrel drain pipe through the first main pipe 21; the circulating outlet 29 is positioned on the second main pipeline 22, and the outlet of the circulating pump 27 is communicated with the water inlet of the outer barrel through the second main pipeline 22; the mounting branch pipe 23 is arranged on the first main pipe 21; furthermore, in general, considering the structural arrangement of a general washing machine, the outer cylinder drain pipe of the washing machine with a circulation pipe is located at the bottom of the outer cylinder, so that the outer cylinder drain pipe can be transversely connected with the first main pipe 21, then one end of the first main pipe 21 is connected with the outer cylinder drain pipe, the other end of the first main pipe is connected with the circulation pump 27, the circulation water enters the circulation pump 27 through the first main pipe 21, after pressurization, the outlet of the circulation pump 27 can be vertically upward, the main part of the second main pipe 22 is longitudinally arranged, the circulation water is from bottom to top in the second main pipe 22, and only the second main pipe has a section transverse direction to be connected with the outer cylinder water inlet, so that circulation from the outer cylinder drain pipe to the outer cylinder water inlet is realized; it should be pointed out that the outer cylinder drain pipe can be a three-way pipe, which is mainly used for draining water, but in the circulating water, the other branch pipe can be used for connecting a circulating pipe, when circulation is needed, an external drain port (such as a drain pump) can be closed, and when circulation is not needed, the circulating pump can be closed, and the drain pump is opened to realize external drainage;

it should be understood that the TOC sensor is located in the installation branch pipe 23 disposed on the first main pipe 21, that is, the TOC sensor is used for detecting the TOC value of the circulating water before the circulating pump 27, so that the TOC sensor can be used for detecting whether the circulating water meets the condition, so that the TOC sensor can be used for judging whether the circulating channel is opened or not, or whether the TOC value in the circulating process meets the condition, so as to decide whether the circulating channel is closed or not; of course, the installation branch 23 may be provided on the second main pipe 22, and in this case, it may be used for obtaining the TOC value of the circulating water of the circulated washing when the circulating pipe is put into use, and if the obtained TOC value does not meet the requirement, it may be determined whether to stop the circulation according to the circumstances.

In some embodiments, as shown in fig. 5, the detection portion of the TOC sensor 1 includes an ultraviolet emitting end 11, a receiving end 12, and a detection water area 17 between the emitting end 11 and the receiving end 12; the transmitting end 11 transmits ultraviolet signals, the ultraviolet signals are absorbed by circulating water in the detection water area 17, and the receiving end 12 receives the residual ultraviolet signals; then, the TOC value of the detected circulating water can be obtained according to the remaining ultraviolet signal, specifically, the absorbance value of the circulating water can be obtained by calculation according to the intensity of the ultraviolet signal emitted by the emitting end 11, the intensity of the remaining ultraviolet signal received by the receiving end 12, the length of the detected water area 17 and the like, and then the TOC value can be obtained according to the absorbance value, for example, the conventional absorbance for 254nm ultraviolet light; therefore, the data transmitted from the TOC sensor 1 to the control device of the washing machine can be the intensity of the residual ultraviolet signal received by the receiving end 12, the intensity of the emitted ultraviolet and the length of the detection water area 17 can be preset, and then the control device calculates to obtain the absorbance value and the TOC value; or, a signal processing module with a calculation function is arranged on the TOC sensor 1, a final TOC value is obtained after calculation, and then the TOC value is transmitted to a control device of the washing machine for program judgment; this embodiment does not limit the subsequent specific data flow, and only sets the specific structure of the detection end of the TOC sensor 1, so that the transmitting end 11 and the receiving end 12 with detection functions contact the circulating water in the circulating pipe, and the transmitting end 11 and the receiving end 12 are water detection areas 17 to detect the circulating water in the areas to obtain the TOC value.

In some embodiments, as shown in fig. 2 and 4, when the TOC sensor 1 is fixedly arranged on the circulating pipe, the emitting end 11, the detection water area 17 and the receiving end 12 of the detection part are arranged along the flowing direction of the circulating water in the vertical circulating pipe; in the specific arrangement, the structural arrangement of the cross section shown in fig. 4 can be adopted, the emission end 11, the water detection area 17 and the receiving end 12 are arranged along the water flow direction in the vertical circulating pipe 2, namely the ultraviolet emission direction of the emission end 11 is vertical to the water flow direction, so that the length direction of the water detection area 17 is vertical to the water flow direction, the circulating water can be stable in the area, and the measurement accuracy is improved; in addition, in the circulating water flowing process, water can smoothly pass through the detection water area 17, resistance passing through the area does not exist, water flows smoothly, and detection accuracy is improved.

Of course, as will be understood by those skilled in the art, for the installation of the installation branch 23 of the circulation pipe 2 and the detection part of the sensor, it is also possible to have a structure of two protruding bases 13 for the corresponding assembly of the emitting end 11 and the receiving end 12 as shown in the drawing, two mounting branch pipes 23 are arranged on the side wall of the circulating pipe 2 and can be used for the holes with proper size for the corresponding components of the transmitting end 11 and the receiving end 12 to pass through, only the corresponding components of the emitting end 11 and the receiving end 12 need to pass through the openings and be arranged in the water flow channel of the circulating pipe 2, and correspondingly, the detection work can be completed, the combination of the base body 13 and the mounting branch pipe 23 is not mainly involved, the installation of the branch pipe 23 for installation of the circulation pipe 2 and the sensing part of the sensor is not the only way as shown in the figure, the specific mode can be selected according to the actual requirement, and the design of the circulating pipe 2 and the structure of the TOC sensor 1 are combined for planning; in addition, for some embodiments, the positioning can be achieved by arranging the openings, for example, two mounting branch pipes 23 (openings) are arranged on the circulating pipe 2 along the circumferential direction, the arrangement of the transmitting end 11 and the receiving end 12 can be achieved, so that the transmitting end 11, the detection water area 17 and the receiving end 12 are arranged along the direction perpendicular to the water flow direction of the circulating water in the circulating pipe 2 to achieve the required direction requirement.

In some embodiments, as shown in fig. 2, 3 and 4, the TOC sensor 1 further includes a base 13, the detecting portion is disposed at one end of the base 13, and when the TOC sensor 1 is installed in the installation branch pipe 23, the base 13 is accommodated in the installation branch pipe 23 and is fixedly and hermetically engaged with the inner side wall 25 of the installation branch pipe; since the TOC sensor 1 belongs to a component connected to the circulating pipe 2, in order to prevent the circulating water in the circulating pipe 2 from leaking, the sensor needs to be fixedly and hermetically connected with the mounting branch pipe 23 on the circulating pipe 2, specifically, as shown in the figure, the base body 13 can be accommodated in the mounting branch pipe 23, and the side wall of the base body 13 needs to be fixedly connected with the inner side wall 25 of the mounting branch pipe 23 and sealed, so as to prevent the circulating water from leaking outside from the side wall; of course, in some of the above solutions, for example, in the solution that two installation branch pipes 23 with proper size are opened on the side wall for the corresponding components of the emitting end 11 and the receiving end 12 to pass through, the base 13 is sealed with the outer wall of the circulation pipe 2, or the emitting end 11 and the receiving end 12 are sealed with the inner wall of the installation branch pipe 23, and the corresponding lengths also need to be adapted to enable the emitting end 11 and the receiving end 12 to be located in the circulation pipe 2; the above is understood to mean the sealing connection of the base body 13 to the mounting branch 23; the specific form of connection can be bonding and buckling; for sealing, the connection form part can achieve the sealing effect, and certainly, the sealing can be performed through conventional sealing forms such as multi-stage water sealing, interference fit and the like.

In some embodiments, as shown in fig. 5, the side wall of the base 13 is provided with a plurality of protruding rings 15 to form a seal with the inner side wall 25 of the installation branch pipe when the TOC sensor 1 is installed in the installation branch pipe 23, and for the purpose of sealing, the protruding rings 15 may be made of a flexible material and have an interference fit, and can overcome a certain pressure of the circulating water; the side wall can adopt the arrangement of multi-stage water seals; as shown in the figure, a snap connection may be provided between the outer periphery of the mounting branch 23 and the exposed portion of the base 13 of the TOC sensor 1 outside the mounting branch, so as to secure the connection between the TOC sensor 1 and the circulation pipe 2.

In some embodiments, as shown in fig. 2, 3, 4 and 5, the other end of the base 13 away from the detection part is provided with a cover 18; the size of the cover body 18 is larger than the inner diameter of the mounting branch pipe 23, and when the TOC sensor 1 is fixedly mounted in the mounting branch pipe 23, the cover body 18 is positioned outside the pipe orifice of the mounting branch pipe 23 and is in sealing fit with the pipe orifice of the mounting branch pipe 23; according to the structure of the TOC sensor 1, as some connecting components may be arranged inside the TOC sensor, the structure of the TOC sensor can be provided with a cover 18, generally, the cover is opened to see the relevant connecting components, and the cover 18 can be utilized to enable the size of the cover to be larger than the inner diameter of the mounting branch pipe 23, in the mounting process, the TOC sensor 1 cannot directly penetrate through the mounting branch pipe 23 to enable the whole body to fall into the mounting branch pipe 23, and the cover 18 can be in sealing fit with the outer side of the pipe orifice of the mounting branch pipe 23 to prevent water leakage; of course, the cover 18 may be sized larger than the outer diameter of the mounting legs 23 so that this portion may be utilized and the cover 18 may be designed to wrap around the outermost periphery of the mounting legs 23 to enhance the seal.

In some embodiments, as shown in fig. 2 and 5, the positioning pin 14 is disposed at a position of the cover 18 close to the mounting branch 23, the pipe orifice of the mounting branch 23 is provided with a positioning groove 24, and when the TOC sensor 1 is mounted on the mounting branch 23, the positioning pin 14 is matched with the positioning groove 24 for mounting and positioning the TOC sensor 1; for example, the emitter 11, the detection water region 17, and the receiver 12 can be positioned along the direction of the circulating water flow in the vertical circulation pipe 2.

In some embodiments, the sidewall of the base 13 is pre-coated with glue, and the TOC sensor 1 is fixed to the inner sidewall 25 of the installation branch pipe by bonding and sealing the glue when the TOC sensor is installed in the installation branch pipe 23.

In some embodiments, as shown in fig. 2, 3, 4 and 5, the cover 18 is provided with a transmission connector 16 at one end away from the base 13 for transmitting signal data detected by the TOC sensor and supplying power to the TOC sensor, and in a corresponding arrangement, the sensor may have a main body of the base 13, the detection portion is used for contacting circulating water, and the other end may be provided with the transmission connector 16 outside the installation branch pipe 23 so as to connect a control end and a data storage end of the washing machine for transmitting data and receiving signals, and further provided with a connecting wire for supplying power, and the like.

The present invention also provides a washing machine, as shown in fig. 1 and 6, comprising a washing machine housing 4, a washing drum arranged in the washing machine housing 4 and the circulation pipe; the washing drum comprises an outer drum 3 and a rotatable inner drum in the outer drum, the inner drum is used for accommodating washing objects, and washing water can flow in the inner drum and the outer drum; when the washing machine circularly washes, the TOC sensor on the circulating pipe detects the TOC value of the circulating water.

While embodiments of the utility model have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the utility model, and further modifications may readily be effected by those skilled in the art, so that the utility model is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.

Claims

1. A circulation duct for a washing machine, characterized by comprising:

2. The circulation pipe for a washing machine according to claim 1, wherein the circulation pipe comprises a main pipe and a mounting branch pipe for accommodating the TOC sensor, the mounting branch pipe being provided on a pipe wall of the main pipe to communicate with the main pipe; when the TOC sensor is installed on the installation branch pipe, the detection part is positioned in the main pipe.

3. The circulation duct for a washing machine as claimed in claim 2, further comprising a circulation pump for supplying power to circulate water; the main pipeline comprises a first main pipeline and a second main pipeline; the circulating inlet is positioned in the first main pipeline, and the inlet of the circulating pump is communicated with the outer barrel drain pipe through the first main pipeline; the circulating outlet is positioned on the second main pipeline, and the outlet of the circulating pump is communicated with the water inlet of the outer barrel through the second main pipeline; the installation branch pipe is arranged on the first main pipe.

4. The circulation tube for a washing machine as claimed in claim 2, wherein the TOC sensor further comprises a base body, the sensing part is provided at one end of the base body, and the base body is received in the mounting branch tube and is fixedly and sealingly engaged with an inner side wall of the mounting branch tube when the TOC sensor is mounted in the mounting branch tube.

5. The circulation duct for washing machine as claimed in claim 4, wherein the base sidewall is provided with a plurality of protrusions to form a seal with an inner sidewall of the mounting bracket when the TOC sensor is mounted to the mounting bracket.

6. The circulation tube for a washing machine as claimed in claim 4, wherein a cover is provided at the other end of the base body away from the sensing part; the size of the cover body is larger than the inner diameter of the mounting branch pipe, and when the TOC sensor is fixedly mounted in the mounting branch pipe, the cover body is positioned on the outer side of the pipe orifice of the mounting branch pipe and is in sealing fit with the pipe orifice of the mounting branch pipe.

7. The circulation duct for washing machine as claimed in claim 6, wherein the cover body is provided with a positioning pin near the mounting branch duct, the opening of the mounting branch duct is provided with a positioning groove, and the positioning pin is engaged with the positioning groove for mounting and positioning the TOC sensor when the TOC sensor is mounted to the mounting branch duct.

8. The circulation tube for a washing machine as claimed in claim 6, wherein a transmission connector is provided at an end of the cover body remote from the base body for transmitting signal data detected by the TOC sensor and for supplying power to the TOC sensor.

9. The circulation duct for washing machine as claimed in claim 1, wherein the sensing part of the TOC sensor includes an ultraviolet ray emitting end, a receiving end, and a sensing water region between the emitting end and the receiving end; the transmitting end transmits ultraviolet signals, the ultraviolet signals are absorbed by circulating water in the detected water area, and the receiving end receives the residual ultraviolet signals so as to provide signals for the washing machine signal processing module to process to obtain the circulating water TOC value.

10. The circulation pipe for the washing machine as claimed in claim 9, wherein the emitter terminal, the sensing water region, and the receiver terminal are arranged in a direction perpendicular to a flow direction of the circulating water in the circulation pipe when the TOC sensor is fixedly provided on the circulation pipe.

11. A washing machine comprising a washing machine housing, a washing tub provided in the washing machine housing, and the circulation duct of any one of claims 1 to 10; the washing drum comprises an outer drum and a rotatable inner drum in the outer drum, the inner drum is used for accommodating washing objects, and washing water can flow in the inner drum and the outer drum; when the washing machine circularly washes, the TOC sensor on the circulating pipe detects the TOC value of the circulating water.