Additive dispensing device and washing machine

Abstract

An additive dispensing device (100) and a washing machine. The additive dispensing device (100) comprises: a water supply path (1) for allowing inflow water entering the additive dispensing device (100) to flow through; and a dispensing unit, used for dispensing an additive to the water supply path (1), wherein a plurality of Venturi tubes (19) arranged in parallel are arranged on the water supply path (1), a negative pressure suction port (191) of each Venturi tube (19) is communicated with the external atmosphere, and negative pressure is formed at the negative pressure suction port (191) under the action of an additive mixed liquid flowing through each Venturi tube (19), external air enters the Venturi tube (19) through the negative pressure suction port (191) and is mixed with the additive mixed liquid flowing through the Venturi tube (19) to excite the additive mixed liquid to generate foam to form a foam-containing mixture. By arranging the plurality of Venturi tubes (19) arranged in parallel on the water supply path (1), the flowing additive liquid is excited by the suctioned air, thereby increasing the foaming amount of the additive mixture dispensed outward, and improving the laundry washing effect.

Description

TECHNICAL FIELD The present invention belongs to the technical field of laundry treatment equipment, and particularly relates to an additive dispensing device of a washing machine, and further relates to a washing machine equipped with the additive dispensing device. BACKGROUND An existing washing machine is generally provided with a water drum for accommodating washing water. A rotatable washing drum is provided in the water drum. Dehydration holes communicating the inside and outside are formed in the washing drum, so that washing water flowing into the water drum can interactively flow inside and outside the washing drum through the dehydration holes, thereby realizing contact between the washing water and a load to be treated that is placed in the washing drum, and achieving the effect of treating the load by using the washing water. The additive dispensing manner of the existing washing machine described above is as follows: by means of an additive dispensing device, an additive is dispensed into a pipeline communicated with the water drum of the washing machine, and then the dispensed additive flows along the pipeline into the water drum of the washing machine. Therefore, in the existing manner, the dispensed additive is located inside the water drum of the washing machine and outside the washing drum, and cannot directly contact the load placed in the washing drum. Then, when the washing machine performs a washing program, the dispensed additive is mixed with washing water flowing into the water drum, and part of the washing water mixed with the additive flows into the washing drum through the dehydration holes and contacts the load to be treated in the drum, so that only a small part of the additive mixed into the washing water can contact the load and act on the load. Therefore, the conventional additive dispensing manner has the problems of low utilization efficiency of the dispensed additive and waste of the additive. Meanwhile, in the conventional additive dispensing manner, in order to ensure that the additive dispensed between the water drum and the washing drum contacts the load to be treated in the washing drum, a large amount of water needs to flow into the water drum until the water level of the washing water in the water drum is higher than the washing drum, so as to ensure that the washing water flows into the washing drum through the dehydration holes and that the additive contacts the load in the washing drum. Therefore, the conventional additive dispensing manner also has the problem that excessive water is used for additive dispensing. In order to solve the above problems, the applicant previously proposed a technical solution in which an additive mixed liquid is directly dispensed into a drum of a washing machine, the additive mixed liquid directly acts on laundry in the drum, and the washing machine efficiently washes laundry that is wetted by the mixed liquid and has a relatively high additive concentration. However, in the above solution, the mixing effect of the additive and inlet water in the dispensing device is poor, and the uniformity of the mixed liquid dispensed into the drum is very low. In addition, because the additive and water are directly mixed in the water path of the dispensing device, the mixing rate between the two liquids is relatively slow, and after mixing, the activity of the additive is not sufficiently excited, thereby affecting the effect of the additive on washing treatment of laundry. In view of this, the present invention is specifically proposed. SUMMARY OF THE INVENTION A technical problem to be solved by the present invention is the deficiencies of the prior art and provide an additive dispensing device, so as to realize the purpose that an additive is directly dispensed outwardly through a water supply flow path. Meanwhile, the present invention further provides an additive dispensing device, so as to realize foaming excitation of the additive and water in the water supply flow path, cause the additive and water to form a mixed liquid containing foaming particles, realize dispensing of the additive mixed liquid containing foaming particles into a washing machine for use, and thereby improve the treatment effect of the dispensed additive on laundry. In order to realize the above object of the invention, the basic concept of the technical solution adopted by the present invention is as follows: The present invention provides an additive dispensing device, comprising: a water supply flow path, configured to allow water to flow therethrough; a dispensing unit, configured to dispense an additive into the water supply flow path, so that the additive is mixed with a water flow to form an additive mixed liquid; wherein: a Venturi tube is provided on the water supply flow path, a negative-pressure suction port of the Venturi tube is communicated with external atmosphere, so that under the action of liquid flowing through the Venturi tube, external air enters from the negative-pressure suction port and is mixed with the additive mixed liquid, for exciting the additive mixed liquid to generate foam. Further, two or more Venturi tubes arranged in parallel are provided on the water supply flow path. Further, a mounting portion radially protruding from an inner wall of the water flow path is provided in the water supply flow path, and the water supply flow path is divided by the mounting portion into an upstream portion and a downstream portion; and the Venturi tube provided on the water supply flow path is mounted on the mounting portion, and two ends of a pipeline of the Venturi tube are respectively communicated with the upstream portion and the downstream portion of the water supply flow path. Further, a ventilation chamber is provided below the mounting portion, and the ventilation chamber is communicated with external atmosphere through a ventilation passage; and the negative-pressure suction port of the Venturi tube is opened downwardly, and a notch for communicating the negative-pressure suction port with the ventilation chamber is provided on the mounting portion, so that the Venturi tube is communicated with the same ventilation chamber. Further, the additive dispensing device comprises a water box, and the water supply flow path is integrally provided in an upper cover of the water box; the upper cover is formed by vertically fastening an upper cover body and a lower cover body, and concave-convex structures arranged in cooperation are provided on opposite facing surfaces of the upper cover body and the lower cover body, so that the water supply flow path is formed between the two cover bodies. The upper cover body is provided with the mounting portion which is protruded downwardly, is formed by a block-shaped structure, and is located inside the water supply flow path, and the Venturi tube is inserted and mounted on the same mounting portion to communicate the water supply flow path on two sides of the mounting portion. And the lower cover body is provided with a groove-shaped structure downwardly recessed and having an opening on an upper, and the mounting portion is correspondingly fastened at the opening of the upper of the grooveshaped structure, so that the groove-shaped structure forms the ventilation chamber. Further, a plurality of branch passages horizontally spaced apart from one another are provided in the mounting portion with the block-shaped structure, and two ends of each of the branch passages are respectively communicated with corresponding two sides of the mounting portion with the block-shaped structure. The Venturi tube is coaxially inserted and mounted in each of the branch passages, and two ends of the Venturi tube are respectively communicated with the upstream portion and the downstream portion of the water supply flow path on the corresponding two sides of the mounting portion with the block-shaped structure. The notch is provided on a lower side of the mounting portion with the block-shaped structure, and the notch is located directly below the negative-pressure suction port of the Venturi tube, so as to communicate an inside of the pipeline of the Venturi tube with the ventilation chamber. Two sealing rings are provided on an outer tube wall of the Venturi tube, and the two sealing rings are respectively located on an upstream side and a downstream side of the notch, so as to seal a gap between the Venturi tube and the branch passages. Preferably, a semi-annular opening opened downwardly and arranged around half a circumference of a tube wall is provided on the tube wall of the Venturi tube, the semi-annular opening is provided directly above the notch being in strip-shaped, and a width of the semi-annular opening is smaller than a width of the notch being in strip-shaped. Further, each of the branch passages is a straight pipe section having an axis extending in a horizontal direction. The Venturi tube comprises a liquid inlet pipe section and a liquid outlet pipe section coaxially connected to each other, wherein the liquid inlet pipe section has a smaller pipe diameter than the liquid outlet pipe section. The liquid inlet pipe section having a small pipe diameter is correspondingly and coaxially inserted in the each of the branch passages, and the liquid outlet pipe section having a large pipe diameter is located outside the mounting portion with the block-shaped structure and in the downstream portion of the water supply flow path. A radial dimension of an outer circumference of the tube wall of the liquid inlet pipe section is equal to a radial dimension of an inner circumferential pipe of the each of the branch passages; an end surface at which the liquid inlet pipe section is connected to the liquid outlet pipe section is abutted against one side of the mounting portion facing the downstream portion of the water supply flow path. Further, one end of the each of the branch passages communicated with the upstream portion of the water supply flow path is provided with a ring of annular stop edge radially protruding inwardly, and an inner circumferential radial dimension of the annular stop edge is smaller than an outer circumferential radial dimension of the tube wall of the liquid inlet pipe section of the Venturi tube. Further, a mounting protrusion outwardly protruding is provided on the outer tube wall of the liquid outlet pipe section, a mounting post upwardly protruding is provided on the lower cover body, the mounting protrusion is correspondingly placed on a top of the mounting post, and a screw passes through the mounting protrusion from top to bottom and is threadedly engaged with and mounted to the mounting post. Further, a bottom wall and a top wall of the water supply flow path on an upstream side of the Venturi tube are both inclined surfaces gradually rising along a liquid flow direction, two inclined surfaces are parallel to each other, and a spacing distance therebetween is greater than a radial dimension of an outer tube wall of the Venturi tube. A bottom wall and a top wall of the water supply flow path on a downstream side of the Venturi tube are both planes, two planes are parallel to each other, and a spacing distance therebetween is greater than the radial dimension of the outer tube wall of the Venturi tube; a distance between the two inclined surfaces is smaller than a distance between the two planes. Further, the plane of the bottom wall of the water supply flow path on the downstream side of the Venturi tube is flush in height with a lowest point of the inclined surface of the bottom wall of the water supply flow path on the upstream side of the Venturi tube; and the plane of the top wall of the water supply flow path on the downstream side of the Venturi tube is flush in height with a highest point of the inclined surface of the top wall of the water supply flow path on the upstream side of the Venturi tube. Further, the Venturi tube is divided, from a liquid inlet end toward a liquid outlet end, into three pipe sections of a constricted pipe section, a straight pipe section, and a flared pipe section that are sequentially communicated and coaxially arranged. The constricted pipe section is a conical pipe section having an inner diameter gradually narrowed along a liquid flow direction; the straight pipe section is a cylindrical pipe section having a constant bore diameter, and a diameter of the straight pipe section is greater than or equal to a maximum pipe diameter of the constricted pipe section, or greater than or equal to a maximum pipe diameter of the flared pipe section; the flared pipe section is a conical pipe section having an inner diameter gradually enlarged along the liquid flow direction. A semicircular opening extending along a circumferential direction of the straight pipe section is provided on a lower portion of a tube wall of the straight pipe section, and the semicircular opening constitutes the negative-pressure suction port. Preferably, the negative-pressure suction port covers at least one-third of a height portion of the lower portion of the tube wall of the straight pipe section. Further, a mixing structure is provided in the upstream portion of the water supply flow path upstream of the Venturi tube, a position where the dispensing unit is communicated with the water supply flow path is located upstream of the mixing structure, and the dispensed additive and supply water are mixed in the mixing structure to form the additive mixed liquid. A further object of the present invention is to provide a washing machine equipped with the additive dispensing device described above, so as to realize direct dispensing of an additive into a washing drum, thereby enabling the dispensed detergent to directly contact a load to be treated in the washing drum and improving the utilization rate of the detergent. In order to realize the above object of the invention, the basic concept of the technical solution adopted by the present invention is as follows: The present invention further discloses a washing machine, comprising a washing drum for accommodating a load to be treated, and the additive dispensing device described in any one of the above. An inlet of the water supply flow path of the additive dispensing device is communicated with a water inlet pipe of the washing machine, an outlet of the water supply flow path is communicated with a liquid outlet structure, and the liquid outlet structure sprays toward the washing drum of the washing machine. Further, the liquid outlet structure is provided on a housing, and / or a door body, and / or a water drum, and / or a window gasket of the washing machine. A spray outlet of the liquid outlet structure is opened toward the inside of the washing drum, and an additive solution foaming mixture sprayed from the liquid outlet structure is directly sprayed into the washing drum. Furthermore, a technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an additive dispensing device, so as to realize the purpose that an additive is directly dispensed outwardly through a water supply flow path. Meanwhile, the present invention further provides an additive dispensing device and an additive dispensing method, so as to realize foaming excitation by mixing the additive and water in the water supply flow path with external air, cause the additive and water to form a mixed liquid containing foaming particles, realize dispensing of the additive mixed liquid containing foaming particles into a washing machine for use, and thereby improve the treatment effect of the dispensed additive on laundry. In order to realize the above object of the invention, the basic concept of the technical solution adopted by the present invention is as follows: The present invention provides an additive dispensing device, comprising: a water supply flow path, configured to allow water to flow therethrough; a flushing water flow path, communicated with a temporary storage chamber and configured to allow flushing water to flow therethrough; a dispensing unit, configured to dispense an additive into the flushing water flow path and / or the temporary storage chamber, so that the flushing water flow and the dispensed additive jointly enter the temporary storage chamber and are mixed to form an additive mixed liquid; and a negative-pressure tube provided on the water supply flow path, wherein a negative-pressure suction port of the negative-pressure tube is respectively communicated with external atmosphere and the temporary storage chamber; wherein when a water flow flows through the negative-pressure tube, negative pressure is generated at the negative-pressure suction port, and the negative pressure is used to simultaneously draw external air and the additive mixed liquid in the temporary storage chamber into the water supply flow path from the negative-pressure suction port, for exciting foam generation. Further, the negative-pressure tube comprises a Venturi tube, and a liquid inlet end and a liquid outlet end of the Venturi tube are both communicated with the water supply flow path, so as to allow the supply water flow to flow through the Venturi tube. The Venturi tube comprises a constricted pipeline, a negative-pressure straight pipeline, and a flared pipeline sequentially communicated from the liquid inlet end toward the liquid outlet end. The negativepressure suction port for communicating the inside and outside of negative-pressure straight pipeline is provided on a pipe wall of the negative-pressure straight pipeline. The negativepressure suction port is communicated with the temporary storage chamber through a dispensing pipeline, and is configured to draw the additive mixed liquid in the temporary storage chamber; and an air inlet is provided in a middle portion of the dispensing pipeline, and the air inlet is communicated with external atmosphere through an air intake pipeline and is configured to draw in external air. Further, a one-way check structure for preventing the additive mixed liquid flowing through the dispensing pipeline from being discharged outwardly through the air intake pipeline is provided on the air intake pipeline and / or at a position where the air intake pipeline is communicated with the dispensing pipeline. Preferably, the air inlet where the air intake pipeline is communicated with the dispensing pipeline is a hole for preventing the additive mixed liquid from flowing outwardly. Further preferably, the air inlet is a small hole having a bore diameter smaller than 5 mm, preferably approximately equal to 1 mm. Further, a one-way ventilation valve is provided on the air intake pipeline and is configured to ensure that only an airflow flowing from the outside toward the dispensing pipeline can flow through the air intake pipeline. Further, the dispensing pipeline comprises a horizontal pipe section and a vertical pipe section, one end of the horizontal pipe section is communicated with the negative-pressure suction port arranged on one side of a pipe wall horizontally extending of the Venturi tube, an other end of the horizontal pipe section is communicated with an upper end of the vertical pipe section, a lower end of the vertical pipe section is communicated with a bottom of the temporary storage chamber, and the air inlet is provided in a middle portion of the horizontal pipe section. A maximum liquid level height of the additive mixed liquid is provided in the temporary storage chamber, and a space of the temporary storage chamber above the maximum liquid level height is a ventilation portion. The ventilation portion is respectively communicated with the air intake pipeline and the air inlet provided on the dispensing pipeline, so that the air inlet provided on the dispensing pipeline is communicated with the air intake pipeline through the ventilation portion of the temporary storage chamber. Further, a chamber with ventilation and liquid intake is provided on one side of the temporary storage chamber, and the chamber with ventilation and liquid intake is communicated with the ventilation portion of the temporary storage chamber. A bottom wall of the chamber with ventilation and liquid intake is higher than the maximum liquid level height in the temporary storage chamber, and a top of the chamber with ventilation and liquid intake is flush with a top of the temporary storage chamber. The air intake pipeline and the flushing water flow path are both communicated with the chamber with ventilation and liquid intake, and the air inlet provided on the dispensing pipeline is communicated with the top of the chamber with ventilation and liquid intake. Further, a first side and a second side of the chamber with ventilation and liquid intake are opposite to each other, the first side is communicated with the temporary storage chamber, the second side is communicated with the air intake pipeline and the flushing water flow path, and the bottom wall of the chamber with ventilation and liquid intake is gradually inclined downwardly from the first side toward the second side. The air intake pipeline and the flushing water flow path are respectively provided at adjacent two ends of the first side of the chamber with ventilation and liquid intake, and inlet orientations of the air intake pipeline and the flushing water flow path are perpendicular to each other. Further, the air inlet is located directly above a position where the chamber with ventilation and liquid intake is communicated with the ventilation portion of the temporary storage chamber, and is configured to communicate a lowest position in a middle portion of the dispensing pipeline and the chamber with ventilation and liquid intake and with a top space of the temporary storage chamber, so that the air inlet of the dispensing pipeline is communicated with the air intake pipeline through the ventilation portion at the top of the temporary storage chamber and the chamber with ventilation and liquid intake, and is configured to draw air from external atmosphere into the dispensing pipeline. Further, the dispensing unit comprises a dispensing pipeline, a liquid storage chamber, and a dispensing pump. Two ends of the dispensing pipeline are respectively communicated with the liquid storage chamber and the flushing water flow path, and the dispensing pump is provided on the dispensing pipeline and is configured to generate a driving force when the dispensing pump operates, so as to draw additive in the liquid storage chamber into the flushing water flow path. Preferably, a one-way valve for one-way communication of the dispensing pipeline is provided on the dispensing pipeline, and is configured to control the additive to flow only from the liquid storage chamber toward the flushing water flow path. The present invention further provides an additive dispensing method for an additive dispensing device, comprising: dispensing an additive in a liquid storage chamber into a flushing water flow path; introducing a flushing water flow into the flushing water flow path, wherein the flushing water flow flushes the dispensed additive into a temporary storage chamber and mixes with the additive to form an additive mixed liquid; introducing a supply water flow into a water supply flow path, wherein when the supply water flow flows through a negative-pressure tube, negative pressure is generated at a negativepressure suction port of the negative-pressure tube, and the negative pressure jointly draws the additive mixed liquid in the temporary storage chamber and external air into the water supply flow path; and when the additive mixed liquid and the external air jointly flow into the water supply flow path, mixing the additive mixed liquid and the external air with each other and forming foam, wherein the additive mixed liquid containing foam is dispensed outwardly together with the supply water flow. Further, a single total amount of the additive mixed liquid mixed and formed in the temporary storage chamber is smaller than an amount corresponding to a maximum liquid level of the temporary storage chamber, and a maximum liquid level height of the temporary storage chamber is lower than a position where the negative-pressure suction port of the negativepressure tube is communicated with external air, so as to ensure that the additive mixed liquid in the temporary storage chamber does not flow out through the air inlet. Further, the additive dispensing device described in any one of the above adopts the above dispensing method to dispense the additive. A further object of the present invention is to provide a washing machine equipped with the additive dispensing device described above, so as to realize direct dispensing of an additive into a washing drum, thereby enabling the dispensed detergent to directly contact a load to be treated in the washing drum and improving the utilization rate of the detergent. In order to realize the above object of the invention, the basic concept of the technical solution adopted by the present invention is as follows: The present invention further discloses a washing machine, comprising a washing drum for accommodating a load to be treated, and further comprising the additive dispensing device described in any one of the above. An inlet of the water supply flow path and an inlet of the flushing water flow path of the additive dispensing device are respectively communicated with a water inlet pipe of the washing machine. An outlet of the water supply flow path is connected to a liquid outlet structure. The liquid outlet structure is provided on a housing, and / or a door body, and / or a water drum, and / or a window gasket of the washing machine. The liquid outlet structure sprays, toward the washing drum of the washing machine, a mixture having foam and formed by mixing the additive and supply water. Further, the liquid outlet structure is provided on a housing, and / or a door body, and / or a water drum, and / or a window gasket of the washing machine. A spray outlet of the liquid outlet structure is opened toward the inside of the washing drum, and an additive solution foaming mixture sprayed from the liquid outlet structure is directly sprayed into the washing drum. After adopting the above technical solutions, compared with the prior art, the present invention has the following beneficial effects: 1. By means of the above device, the additive is directly dispensed outwardly through the water path provided on the dispensing device, thereby avoiding the additive flowing through the water box. This not only shortens the flow path of the additive, but also reduces the amount of flushing water required for additive dispensing, and greatly improves the additive utilization rate. Meanwhile, the additive solution flowing out of the water path is directly sprayed out through the liquid outlet structure, so that the coverage area of the sprayed additive solution can be increased, and the additive solution can be directly sprayed onto a load to be treated deep inside the washing drum. 2. Meanwhile, by providing the additive dispensing device on the washing machine, the additive of the washing machine directly flows through the water supply flow path to the liquid outlet structure and is directly sprayed into the washing drum by the liquid outlet structure. Thus, the additive of the washing machine does not pass through the water box or the water drum outside the washing drum, but directly flows from the water path of the dispensing device into the washing drum and is sprayed onto the load to be treated, thereby realizing the purpose of directly spraying the additive solution onto the load to be treated in the washing drum. 3. In addition, by providing the Venturi tube on the water supply flow path, air is introduced when the supply water flow in the water supply flow path flows therethrough, so that air particles are mixed into the water flow flowing through the water supply flow path, thereby achieving foaming of the added additive by using inlet water containing air particles, obtaining an additive mixed liquid containing foaming particles with a better washing effect, and further realizing significant technical progress of improving additive activity and enhancing the washing treatment effect of the dispensed additive mixed liquid on laundry. In particular, by providing a plurality of Venturi tubes arranged in parallel on the water supply flow path, all additive solution flowing therethrough is excited by pumped air, thereby realizing significant technical progress of increasing the foaming amount of the additive mixture dispensed outwardly by the dispensing device. 4. In addition, by providing the additive dispensing device on the washing machine, the additive of the washing machine directly flows through the water supply flow path to the liquid outlet structure and is directly sprayed into the washing drum by the liquid outlet structure. Thus, the additive of the washing machine does not pass through the water box or the water drum outside the washing drum, but directly flows from the water path of the dispensing device into the washing drum and is sprayed onto the load to be treated, thereby realizing the purpose of directly spraying the additive solution onto the load to be treated in the washing drum. 5. In addition, by providing the negative-pressure tube on the water supply flow path, when the supply water flow in the water supply flow path flows therethrough, the additive mixed liquid in the temporary storage chamber and external air are simultaneously drawn, so that air particles are mixed into the additive mixed liquid, thereby achieving foaming of the additive mixed liquid by using the air particles, obtaining an additive mixed liquid containing foaming particles with a better washing effect, and further realizing significant technical progress of improving additive activity and enhancing the washing treatment effect of the dispensed additive mixed liquid on laundry. In particular, external air is injected into the additive mixed liquid in the temporary storage chamber through the negative-pressure suction port of the negative-pressure tube, so that all additive solution drawn into the water supply flow path is excited by pumped air, thereby realizing significant technical progress of increasing the foaming amount of the additive mixture dispensed outwardly by the dispensing device. Meanwhile, the present invention has a simple structure, significant effects, and is suitable for popularization and use. The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and descriptions thereof are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings described below are merely some embodiments. For a person of ordinary skill in the art, other drawings may also be obtained based on these drawings without creative effort. In the accompanying drawings: FIG. 1 is a schematic structural diagram of a washing machine according to an embodiment of the present invention; FIG. 2 is a schematic sectional structural diagram of the washing machine according to an embodiment of the present invention; FIG. 3 is a schematic perspective structural diagram of an additive dispensing device according to an embodiment of the present invention; FIG. 4 is a schematic top structural diagram of the additive dispensing device according to an embodiment of the present invention; FIG. 5 is a schematic sectional structural diagram taken along line A-A in FIG. 4 according to an embodiment of the present invention; FIG. 6 is an enlarged schematic structural diagram of an elliptical dashed-line portion in FIG. 5 according to an embodiment of the present invention; FIG. 7 is a schematic perspective structural diagram of the additive dispensing device with an upper cover plate removed according to an embodiment of the present invention; FIG. 8 is a schematic principle diagram of an additive dispensing device according to another implementation of an embodiment of the present invention; FIG. 9 is a schematic perspective structural diagram of the additive dispensing device according to another implementation of an embodiment of the present invention; FIG. 10 is a schematic top structural diagram of the additive dispensing device according to another implementation of an embodiment of the present invention; FIG. 11 is a schematic sectional structural diagram taken along line A-A in FIG. 10 according to an embodiment of the present invention; FIG. 12 is a schematic sectional structural diagram taken along line B-B in FIG. 11 according to an embodiment of the present invention; and FIG. 13 is a schematic sectional structural diagram taken along line C-C in FIG. 11 according to an embodiment of the present invention. Main reference numerals in the drawings: 100, dispensing device; 200, water drum; 300, washing drum; 400, window gasket; 500, liquid outlet structure; 600, conduit; 700, mixing structure; 1, water supply flow path; 2, water box; 3, upper cover; 31, upper cover body; 32, lower cover body; 15, impeller; 16, mixing chamber; 19, Venturi tube; 190, sealing ring; 191, negative-pressure suction port; 192, liquid inlet end; 193, liquid outlet end; 194, liquid inlet pipe section; 195, liquid outlet pipe section; 196, constricted pipeline; 197, straight pipeline; 198, flared pipeline; 199, mounting protrusion; 110, mounting portion; 111, branch passage; 112, notch; 113, annular stop edge; 114, vertical mating rib; 120, ventilation chamber; 121, ventilation passage; 122, vertical rib; 130, mounting post; 131, screw; 8, upstream portion; 9, downstream portion; 81, inclined surface; 91, plane; 4, flushing water flow path; 5, temporary storage chamber; 6, negative-pressure tube; 7, dispensing unit; 71, liquid dispensing channel; 8, liquid storage chamber; 9, dispensing pump; 10, air intake pipeline; 11, dispensing pipeline; 111, horizontal pipe section; 112, vertical pipe section; 12, air inlet; 13, first switch valve; 14, second switch valve; 015, chamber with ventilation and liquid intake. It should be noted that these accompanying drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any manner, but rather to explain the concept of the present invention to those skilled in the art by reference to specific DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be described clearly and completely below with reference to the accompanying 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. In the description of the present invention, it should be noted that orientation or positional relationship indicated by the terms “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “inside,” “outside,” and the like are based on orientation or positional relationship shown in the accompanying drawings, and are merely for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation. Therefore, these terms should not be understood as limiting the present invention. In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms “mounted,” “connected,” and “coupled” should be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; may be a mechanical connection or an electrical connection; and may be a direct connection or an indirect connection through an intermediate medium. For a person of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances. As shown in FIG. 1 to FIG. 2, an embodiment of the present invention further introduces a washing machine, comprising: a water drum 200 for containing water; a rotatable washing drum 300 mounted in the water drum 200 and configured to accommodate a load to be treated; and an additive dispensing device 100 configured to directly dispense an additive into the washing drum 300. With the above arrangement, the washing machine can realize the use effect that the additive is directly dispensed into the washing drum 300 and the dispensed additive is directly sprayed onto the load to be treated in the washing drum 300, thereby achieving significant technical progress in improving the utilization rate of the additive. As shown in FIG. 1 to FIG. 7, the additive dispensing device 100 according to an embodiment of the present invention comprises: a water supply flow path 1, configured to allow inlet water entering the additive dispensing device 100 to flow therethrough; a dispensing unit, configured to dispense an additive into the water supply flow path 1; and a liquid outlet structure 500, wherein an outlet of the water supply flow path 1 is connected to the liquid outlet structure 500, and the liquid outlet structure 500 is arranged toward the washing drum 300 of the washing machine. When the additive is dispensed, a small amount of inlet water flows into the water supply flow path, so that the additive is mixed with the small amount of inlet water in the water supply flow path 1 to form an additive solution. The additive solution supplied by the water supply flow path 1 can be directly sprayed onto the load to be treated in the washing drum 300 through the liquid outlet structure 500, thereby significantly improving the utilization rate of the dispensed additive. By means of the above device, the additive is directly dispensed outwardly through the water path provided on the dispensing device 100, thereby avoiding the additive flowing through the water box. This not only shortens the flow path of the additive, but also reduces the amount of flushing water required for additive dispensing, and greatly improves the additive utilization rate. As shown in FIG. 1 to FIG. 7, in an embodiment of the present invention, the water supply flow path 1 is integrated on a water box 2 of the additive dispensing device 100. The outlet of the water supply flow path 1 is provided on an outer side of the water box 2. The liquid outlet structure 500 is provided outside the water box 2, and the outlet of the water supply flow path 1 is communicated with the liquid outlet structure 500 through a conduit 600. By integrally providing the water supply flow path 1 on the water box 2 of the additive dispensing device 100, and directly connecting the outlet of the water supply flow path 1 to the liquid outlet structure 500, the additive and inlet water drawn through the water supply flow path 1 are jointly sprayed out, thereby realizing the purpose that the additive dispensing device 100 performs spray dispensing outwardly directly through the liquid outlet structure 500, without passing through the water box portion of the dispensing device 100. Preferably, the liquid outlet structure 500 may be any nozzle structure in the prior art, and has a spray outlet opened toward a rotating drum of the washing machine, for spraying and dispensing a mixed liquid into the rotating drum of the washing machine. As shown in FIG. 1 to FIG. 7, in an embodiment of the present invention, a plurality of Venturi tubes 19 arranged in parallel are provided on the water supply flow path 1. The negativepressure suction port 191 of each Venturi tube 19 is communicated with external atmosphere. Under the action of the additive mixed liquid flowing through each Venturi tube 19, negative pressure is formed at the negative-pressure suction port 191, so that external air enters the Venturi tube 19 from the negative-pressure suction port 191 and is mixed with the additive mixed liquid flowing through the Venturi tube 19, thereby exciting the additive mixed liquid to generate foam and form a mixture containing foam. Thus, the additive mixture containing foam is directly sprayed onto the load to be treated in the washing drum 300 through the liquid outlet structure 500, and the foamed additive mixed liquid is used to spray-wash the load, so as to achieve a washing effect with less inlet water and higher washing efficiency. Meanwhile, by providing the plurality of parallel Venturi tubes 19, each Venturi tube 19 allows part of the additive mixed liquid to flow therethrough, so that multiple streams of air are respectively drawn in by the plurality of Venturi tubes 19 to foam the additive mixed liquid, thereby significantly improving the foaming efficiency of the additive mixed liquid. In an embodiment of the present invention, a mounting portion 110 radially protruding from an inner wall of the water flow path is provided in the water supply flow path 1, and the mounting portion 110 divides the water supply flow path 1 into an upstream portion 8 and a downstream portion 9. Each Venturi tube 19 is mounted on the mounting portion 110, and two ends of each Venturi tube 19 are respectively communicated with the upstream portion 8 and the downstream portion 9 of the water supply flow path. Thus, the water supply flow path 1 is partitioned by the mounting portion 110, so that the additive mixed liquid in the upstream portion 8 of the water supply flow path 1 must flow through one Venturi tube 19 before crossing the mounting portion 110 and flowing to the downstream portion, thereby ensuring that all of the additive mixed liquid can be used to draw air and be mixed with the air for foaming, and significantly improving the foaming efficiency of the additive mixed liquid. In an embodiment of the present invention, a ventilation chamber 120 is provided below the mounting portion 110, and the ventilation chamber 120 is communicated with external atmosphere through a ventilation passage 121. The ventilation passage 121 may be directly communicated with an opening formed in an outer wall of a housing of the dispensing device 100, so as to achieve communication with external atmosphere. Alternatively, the ventilation passage 121 may be connected into an internal chamber of the housing of the dispensing device and communicated with external atmosphere through an opening at a front end of the chamber. Of course, the ventilation passage 121 may also be connected to the inside of a drum of the washing machine and communicated with external atmosphere through a ventilation opening formed in the drum, or other similar arrangements may be adopted. Meanwhile, in an embodiment of the present invention, the negative-pressure suction port 191 of each Venturi tube 19 is opened downwardly, and a notch 112 for communicating the negative-pressure suction port 191 with the ventilation chamber 120 is provided on the mounting portion 110, so that each Venturi tube 19 is communicated with the same ventilation chamber 120. Thus, each Venturi tube 19 is communicated with atmosphere and can draw in air to foam the additive mixed liquid flowing therethrough. In an embodiment of the present invention, the additive dispensing device comprises a water box 2, and an upper cover 3 is fastened to the top of the water box 2. The water supply flow path 1 is integrally provided in the upper cover 3. The upper cover 3 is formed by vertically fastening an upper cover body 31 and a lower cover body 32. Concave-convex structures arranged in cooperation are provided on opposite facing surfaces of the two cover bodies. The concave-convex structures cause a gap passage to be formed between fastening contact surfaces of the two cover bodies, and the gap passage constitutes the water supply flow path 1. Preferably, the upper cover body and the lower cover body are connected by a welding process, so as to fixedly assemble the upper cover body and the lower cover body, and weld the opposing concave-convex structures together into one body, so that the water supply flow path integrated in the upper cover does not leak water and the upper and lower cover bodies can also be fixedly assembled into one body. Meanwhile, the upper cover body 31 is provided with the mounting portion 110 which protrudes downwardly, is located in the water supply flow path 1, and is formed by a block-shaped structure. Each Venturi tube 19 extends horizontally along an axis and is correspondingly inserted and mounted on the mounting portion 110. The lower cover body 32 is provided with a downwardly recessed groove-shaped structure having an open upper side. A bottom wall of the mounting portion 110 is correspondingly fastened at an upper opening of the groove-shaped structure, so that an internal space of the groove-shaped structure constitutes the ventilation chamber 120. The bottom wall of the mounting portion 110 is in corresponding sealing contact with a groove opening of the groove-shaped structure, so that the ventilation chamber 120 is separated from the water supply flow path 1. Preferably, in order to ensure positioning accuracy when the upper and lower cover bodies are fastened and assembled, two vertical ribs 122 protruding and extending upwardly and arranged at intervals along the liquid flow direction in the water supply flow path 1 are provided on a bottom wall of the lower cover body 32. Two vertical mating ribs 114 protruding downwardly and arranged at intervals along the liquid flow direction in the water supply flow path 1 are provided on a bottom wall of the mounting portion 110. The two vertical ribs 122 and the two vertical mating ribs 114 are correspondingly arranged one-to-one opposite each other. Lower ends of the vertical ribs 122 abut against upper ends of the vertical mating ribs 114 and are connected into one body by a welding process, so that joints between the vertical ribs 122 and the vertical mating ribs 114 are integrally connected, thereby preventing liquid flowing in the water supply flow path 1 from entering the ventilation chamber 120 from the joints between the upper and lower cover bodies. In an embodiment of the present invention, a plurality of branch passages 111 horizontally spaced apart from one another are provided in the block-shaped mounting portion 110, and axes of the branch passages 111 are parallel to the liquid flow direction in the water supply flow path 1. Preferably, the axes of the branch passages 111 are located in the same horizontal plane, and the axes of the branch passages 111 are arranged at equal intervals in a horizontal direction perpendicular to the liquid flow direction in the water supply flow path 1, so that the additive mixed liquid in various portions of the water supply flow path 1 can uniformly flow into corresponding Venturi tubes 19. Meanwhile, two ends of each branch passage 111 are respectively communicated with opposite two sides of the block-shaped mounting portion 110. One Venturi tube 19 is coaxially inserted and mounted in each branch passage 111, and two ends of the Venturi tube 19 are respectively communicated with the upstream portion 8 and the downstream portion 9 of the water supply flow path 1 on the opposite two sides of the blockshaped mounting portion 110, so that the additive mixed liquid passes through the Venturi tube 19, is foamed, and then flows into the downstream portion 9 of the water supply flow path 1. In addition, a notch 112 is formed in a lower side wall of the block-shaped mounting portion 110. The notch 112 extends in a direction perpendicular to the liquid flow direction in the water supply flow path 1, and the notch 112 respectively communicates each branch passage 111 with the ventilation chamber 120 below. The notch 112 is located directly below the negative-pressure suction port 191 of each Venturi tube 19, so as to communicate the inside of each Venturi tube 19 pipeline with the ventilation chamber 120 through the negative-pressure suction port 191 and the notch 112. Two sealing rings 190 are sleeved on an outer tube wall of the Venturi tube 19, and the two sealing rings 190 are respectively located on an upstream side and a downstream side of the notch 112, so as to seal a gap between the Venturi tube 19 and the branch passage 111, thereby preventing liquid flowing in the water supply flow path 1 from entering the ventilation chamber 120 through the gap. Preferably, a semi-annular opening opened downwardly and arranged around half a circumference of the tube wall is provided on the tube wall of the Venturi tube 19. The semiannular opening is provided directly above the strip-shaped notch 112, and the semi-annular opening constitutes the negative-pressure suction port 191 of the Venturi tube 19. In the liquid flow direction of the water supply flow path 1, a width of the semi-annular opening is smaller than a width of the strip-shaped notch 112, so as to ensure that sufficient negative pressure can be generated at the negative-pressure suction port 191 to draw air from external atmosphere into the pipeline of the Venturi tube 19. Further preferably, the semi-annular opening is located on a side of the strip-shaped notch 112 close to the upstream portion 8 of the water supply flow path 1, so that the negative-pressure suction port 191 formed by the semi-annular opening entirely falls within a corresponding overlapping range of the strip-shaped notch 112, and the drawn-in air is not interfered with by the tube wall to cause turbulence interference. In an embodiment of the present invention, the branch passage 111 is a straight pipe passage having an axis extending in a horizontal direction. The Venturi tube 19 is a straight pipe structure coaxially inserted in the straight pipe section. The straight pipe structure is divided into two sections having different outer circumferential radial dimensions, namely a liquid inlet pipe section 194 having a smaller outer pipe diameter and a liquid outlet pipe section 195 having a larger outer pipe diameter. The liquid inlet pipe section 194 and the liquid outlet pipe section 195 are coaxially connected. A non-connected end of the liquid inlet pipe section 194 is the liquid inlet end 192 of the Venturi tube 19, and a non-connected end of the liquid outlet pipe section 195 is the liquid outlet end 193 of the Venturi tube 19. The liquid inlet pipe section 194 is correspondingly and coaxially inserted in the branch passage 111. An outer circumferential radial dimension of the liquid inlet pipe section 194 is equal to an inner circumferential bore diameter dimension of the branch passage 111. The liquid outlet pipe section 195 is located outside the branch passage 111 and in the downstream portion 9 of the water supply flow path 1. The liquid outlet pipe section 195 and the liquid inlet pipe section 194 are coaxially arranged and connected through an annular right-angle stepped surface. The annular right-angle stepped surface is located at an annular end surface of an end portion of the liquid inlet pipe section 194 and correspondingly abuts against a peripheral portion of the branch passage 111 on a side of the mounting portion 110 facing the downstream portion 9 of the water supply flow path 1, so that after the Venturi tube 19 is correspondingly inserted and mounted on the mounting portion 110, the insertion position is positioned by means of the above abutting fit. Preferably, one end of the branch passage 111 communicated with the upstream portion 8 of the water supply flow path 1 is provided with a ring of annular stop edge 113 radially protruding inwardly. An inner circumferential radial dimension of the annular stop edge 113 is smaller than a radial dimension of an outer circumferential tube wall of the liquid inlet pipe section 194 of the Venturi tube 19, and is greater than or equal to a radial dimension of an inner circumferential hole of the liquid inlet pipe section 194. Thus, after the liquid inlet pipe section 194 of the Venturi tube 19 is correspondingly inserted into the branch passage 111, the inserted end is in limiting abutment with the annular stop edge 113, thereby realizing positioning of the insertion position of the Venturi tube 19. Of course, in order to ensure realization of the above limiting abutment, an axial length of the liquid inlet pipe section 194 of the Venturi tube 19 is equal to an axial length of the branch passage 111, so that a liquid inlet end surface of the liquid inlet pipe section 194 and a liquid inlet annular end surface of the liquid outlet pipe section 195 can both realize limiting abutment with the mounting portion 110. In an embodiment of the present invention, an outwardly protruding mounting protrusion 199 is provided on an outer tube wall of the liquid outlet pipe section 195, and an extending direction of the mounting protrusion 199 is any tangential direction of the liquid outlet pipe section 195. Preferably, the mounting protrusion 199 is located near the liquid outlet end 193 of the liquid outlet pipe section 195, so that a user can grip the mounting protrusion 199 to drive the Venturi tube 19 to be correspondingly inserted into the branch passage 111. Meanwhile, an upwardly protruding mounting post 130 located in the water supply flow path 1 is provided on the lower cover body 32. The mounting protrusion 199 is correspondingly placed on a top of the mounting post 130, and a screw 131 passes through the mounting protrusion 199 from top to bottom and is threadedly engaged with and mounted to the mounting post 130. In an embodiment of the present invention, a bottom wall and a top wall of the water supply flow path 1 on an upstream side of the Venturi tube 19 are both inclined surfaces 81 gradually rising along the liquid flow direction. The two inclined surfaces 81 are parallel to each other, and a spacing distance therebetween is greater than a radial dimension of an outer tube wall of the Venturi tube 19, so that the additive mixed liquid flowing into the Venturi tube 19 flows upwardly under the action of the upwardly inclined inner walls and the liquid flow rate is reduced, thereby avoiding an excessively high pressure in the Venturi tube 19. Meanwhile, a bottom wall and a top wall of the water supply flow path 1 on a downstream side of the Venturi tube 19 are both planes 91. The two planes 91 are parallel to each other, and a spacing distance therebetween is greater than the radial dimension of the outer tube wall of the Venturi tube 19. A distance between the two inclined surfaces 81 is smaller than a distance between the two planes 91, so that a pipe diameter dimension of the water supply flow path 1 on the downstream side of the Venturi tube 19 is greater than that on the upstream side, thereby avoiding poor flow of the additive mixed liquid caused by excessive pressure on the downstream side. In particular, when a relatively large amount of foam is generated on the downstream side of the Venturi tube 19, the larger space of the water supply flow path 1 can buffer the foam, thereby avoiding situations in which foam accumulates at the liquid outlet of the Venturi tube 19 and affects smoothness of liquid flow in the water supply flow path 1. Preferably, a bottom wall plane 91 of the water supply flow path 1 on the downstream side of the Venturi tube 19 is flush in height with a lowest point of the bottom wall inclined surface 81 of the water supply flow path 1 on the upstream side of the Venturi tube 19. A top wall plane 91 of the water supply flow path 1 on the downstream side of the Venturi tube 19 is flush in height with a highest point of the top wall inclined surface 81 of the water supply flow path 1 on the upstream side of the Venturi tube 19. Further preferably, the lowest point height of the bottom wall inclined surface 81 of the water supply flow path 1 on the upstream side of the Venturi tube 19 is flush with a bottom wall height of other portions of the water supply flow path 1, and the lowest point height of the top wall inclined surface 81 of the water supply flow path 1 on the upstream side of the Venturi tube 19 is flush with a top wall height of other portions of the water supply flow path 1. In an embodiment of the present invention, an internal pipeline of the Venturi tube 19 is divided, from the liquid inlet end 192 toward the liquid outlet end 193, into three pipe sections that are sequentially communicated and coaxially arranged, namely a constricted pipeline 196, a straight pipeline 197, and a flared pipeline 198. The constricted pipeline 196 is a conical pipe section having a bore diameter gradually narrowed along the liquid flow direction. The straight pipeline 197 is a cylindrical pipeline having a constant bore diameter, and a pipe diameter thereof is greater than or equal to a maximum pipe diameter of the constricted pipeline 196, or greater than or equal to a maximum pipe diameter of the flared pipeline 198. The flared pipeline 198 is a conical pipeline having a bore diameter gradually enlarged along the liquid flow direction. A semicircular opening is formed in a lower portion of a tube wall of the straight pipeline 197, and the semicircular opening constitutes the negative-pressure suction port 191. Preferably, the negative-pressure suction port 191 covers at least one-third of a height portion of the lower portion of the tube wall of the straight pipeline 197. In an embodiment of the present invention, a mixing structure 700 is provided on the water supply flow path 1 upstream of the Venturi tube 19. A position where the dispensing unit is communicated with the water supply flow path 1 is located on a portion of the water supply flow path 1 upstream of the mixing structure 700, and the mixing structure 700 mixes the dispensed additive and supply water to form the additive mixed liquid. The water supply flow path 1 of the additive dispensing device 100 is provided with a multi-stage mixing structure, which is configured to form a vortex water flow in the water supply flow path 1 and mix the dispensed additive with inlet water. The liquid outlet structure 500 is connected to the outlet of the water supply flow path 1 and is configured to dispense the mixed additive and water. By providing the mixing structure in the water supply flow path, the additive and water in the water supply flow path are sufficiently mixed, so that the additive and inlet water drawn by the water supply flow path of the additive dispensing device are premixed uniformly before entering the Venturi tube for foaming, thereby further improving the foaming efficiency of the additive mixed liquid and realizing significant technical progress of using the mixed liquid containing foam to perform enhanced intensive washing on laundry in the washing drum. In an embodiment of the present invention, the mixing structure may be any existing structure capable of mixing the additive and the supply water flow. Specifically, the mixing structure may be as follows: as shown in FIG. 7, a mixing chamber 16 connected in series is provided on the water supply flow path 1, an impeller 15 is provided in the mixing chamber 16, and a liquid mixture composed of the additive and inlet water flowing through the mixing chamber 16 pushes the impeller 15 to rotate, thereby mixing the dispensed additive with the inlet water. As shown in FIG. 8 to FIG. 13, an embodiment of the present invention introduces an additive dispensing device, comprising: a water supply flow path 1, configured to allow supply water to flow therethrough; a flushing water flow path 4, communicated with a temporary storage chamber 5 and configured to supply a flushing water flow; a dispensing unit 7, configured to dispense an additive into the flushing water flow path 4 and / or the temporary storage chamber 5, wherein the flushing water flow and the dispensed additive are mixed in the temporary storage chamber 5 to form an additive mixed liquid; and a negative-pressure tube 6 provided on the water supply flow path 1. A negative-pressure suction port 191 of the negativepressure tube 6 is respectively communicated with external atmosphere and the temporary storage chamber 5. When a supply water flow flows through the negative-pressure tube 6, negative pressure is generated at the negative-pressure suction port 191, and the negative pressure is used to simultaneously draw external air and the additive mixed liquid in the temporary storage chamber 5 into the water supply flow path 1 from the negative-pressure suction port 191, thereby exciting foam generation and forming an additive mixture containing foam. By providing the negative-pressure tube on the water supply flow path, when the supply water flow in the water supply flow path flows therethrough, the additive mixed liquid in the temporary storage chamber and external air are simultaneously drawn, so that air particles are mixed into the additive mixed liquid. Thus, the additive mixed liquid is excited by the air particles to foam, thereby obtaining an additive mixed liquid containing foaming particles with a better washing effect, and further realizing significant technical progress of improving additive activity and enhancing the washing treatment effect of the dispensed additive mixed liquid on laundry. In particular, external air is injected into the additive mixed liquid in the temporary storage chamber through the negative-pressure suction port of the negative-pressure tube, so that all additive solution drawn into the water supply flow path is excited by pumped air, thereby realizing significant technical progress of increasing the foaming amount of the additive mixture dispensed outwardly by the dispensing device. In an embodiment of the present invention, the negative-pressure tube 6 comprises a Venturi tube 19. A liquid inlet end 192 and a liquid outlet end 193 of the Venturi tube 19 are both communicated with the water supply flow path 1, so that the Venturi tube 19 is connected in series on the water supply flow path 1 and all supply water flow flowing through the water supply flow path 1 flows through the Venturi tube 19. The Venturi tube 19 comprises a constricted pipeline 196, a negative-pressure straight pipeline 197, and a flared pipeline 198 sequentially arranged from the liquid inlet end 192 toward the liquid outlet end 193. A negativepressure suction port 191 for communicating the inside and outside of the pipeline of the Venturi tube 19 is provided on a pipe wall of the negative-pressure straight pipeline 197. The negativepressure suction port 191 is communicated with the temporary storage chamber 5 through a dispensing pipeline 11 and is configured to draw the additive mixed liquid in the temporary storage chamber 5. An air inlet 12 is provided in a middle portion of the dispensing pipeline 11, and the air inlet 12 is communicated with external atmosphere through an air intake pipeline 10 and is configured to draw in external air. In an embodiment of the present invention, a one-way check structure for preventing the additive mixed liquid flowing through the dispensing pipeline 11 from being discharged outwardly through the air intake pipeline 10 is provided on the air intake pipeline 10 and / or at the air inlet 12 where the air intake pipeline 10 is communicated with the dispensing pipeline 11. The one-way check structure may be any existing structure capable of realizing one-way communication of airflow. Preferably, the one-way check structure is configured such that the air inlet 12 where the air intake pipeline 10 is communicated with the dispensing pipeline 11 is a small hole having a bore diameter smaller than 5 mm, preferably approximately equal to 1 mm, so that the air inlet 12 having the relatively small bore diameter cannot allow the washing additive mixed liquid to flow outwardly and can only allow gas to flow in for exchange, thereby enabling the air inlet 12 having the relatively small bore diameter to constitute the one-way check structure. Further preferably, the one-way check structure may alternatively be a one-way ventilation valve provided on the air intake pipeline 10, and configured to ensure that only an airflow flowing from the outside toward the dispensing pipeline 11 can flow through the air intake pipeline 10, which is not shown in the accompanying drawings. In an embodiment of the present invention, the dispensing pipeline 11 comprises a horizontal pipe section 111 and a vertical pipe section 112. One end of the horizontal pipe section 111 is communicated with the negative-pressure suction port 191 opened on one side of a pipe wall of the horizontally extending Venturi tube 19, and the other end of the horizontal pipe section 111 is communicated with an upper end of the vertical pipe section 112. A lower end of the vertical pipe section 112 is communicated with a bottom of the temporary storage chamber 5, and the air inlet 12 is provided in a middle portion of the horizontal pipe section 111. A top of the temporary storage chamber 5 is respectively communicated with the air intake pipeline 10 and the air inlet 12 provided on the dispensing pipeline 11. Positions where the air intake pipeline 10 and the air inlet 12 are communicated with the temporary storage chamber 5 are both higher than the maximum liquid level height in the temporary storage chamber 5, and are configured to communicate the air inlet 12 provided on the dispensing pipeline 11 with the air intake pipeline 10 through a top space of the temporary storage chamber 5. In an embodiment of the present invention, a chamber with ventilation and liquid intake 015 communicated therewith is provided on one side of the temporary storage chamber 5. A bottom wall of the chamber with ventilation and liquid intake 015 is higher than the maximum liquid level height in the temporary storage chamber 5, and a top of the chamber with ventilation and liquid intake 015 is flush with a top of the temporary storage chamber 5. The air intake pipeline 10 and the flushing water flow path 4 are both communicated with the chamber with ventilation and liquid intake 015, and the air inlet 12 provided on the dispensing pipeline 11 is communicated with the top of the chamber with ventilation and liquid intake 015. Preferably, opposite two sides of the chamber with ventilation and liquid intake 015 are respectively a first side and a second side. The first side is communicated with the temporary storage chamber 5, the second side is communicated with the air intake pipeline 10 and the flushing water flow path 4, and the bottom wall of the chamber with ventilation and liquid intake 015 is gradually inclined downwardly from the first side toward the second side. Further preferably, the air intake pipeline 10 and the flushing water flow path 4 are respectively provided at opposite two ends of the first side of the chamber with ventilation and liquid intake 015, and inlet orientations of the air intake pipeline 10 and the flushing water flow path 4 are perpendicular to each other, so as to prevent incoming liquid from flowing out through the air intake pipeline 10. Still further preferably, a bottom wall height of the air intake pipeline 10 is higher than a bottom wall height of the flushing water flow path 4. Meanwhile, in the present invention, the air intake pipeline 10 is configured as a pipeline structure having a certain height, and the air intake pipeline 10 is lower than the height of the air inlet 12. Thus, when a relatively large amount of additive mixed liquid enters the temporary storage chamber 5 and exceeds the maximum liquid level height, the additive mixed liquid in the temporary storage chamber 5 can overflow outwardly through the air intake pipeline 10, thereby preventing the additive mixed liquid from flowing into the water supply flow path 1 through the air inlet. Accordingly, the air intake pipeline 10 simultaneously integrates dual functions of air supply and drainage. In an embodiment of the present invention, the air inlet 12 is located directly above a position where the chamber with ventilation and liquid intake 015 is communicated with the temporary storage chamber 5, and is configured to communicate a lowest position in the middle portion of the dispensing pipeline 11, the chamber with ventilation and liquid intake 015, and a top space of the temporary storage chamber 5, so that the air inlet 12 of the dispensing pipeline 11 is communicated with the air intake pipeline 10 through the chamber with ventilation and liquid intake 015 and the top space of the temporary storage chamber 5, and is configured to draw air from external atmosphere into the dispensing pipeline 11. With the above arrangement, the air intake pipeline 10 and the air inlet 12 can be communicated by using the top spaces of the temporary storage chamber 5 and the chamber with ventilation and liquid intake 015 that do not retain the washing additive mixed liquid at all times. In an embodiment of the present invention, the dispensing unit 7 comprises a liquid dispensing channel 71, a liquid storage chamber 8, and a dispensing pump 9. Two ends of the liquid dispensing channel 71 are respectively communicated with the liquid storage chamber 8 and the flushing water flow path 4. The dispensing pump 9 is provided on the liquid dispensing channel 71, and is configured to generate a driving force when the dispensing pump 9 operates, so as to draw the additive in the liquid storage chamber 8 into the flushing water flow path 4. Preferably, a one-way valve for one-way communication of the liquid dispensing channel 71 is provided on the liquid dispensing channel 71, and is configured to control the additive to flow only from the liquid storage chamber 8 toward the flushing water flow path 4. The liquid storage chamber 8 may contain any one or combination of existing laundry treatment additives, such as detergent, softener, rinsing agent, disinfectant, bleaching agent, fragrance additive, and the like. Of course, the dispensing unit 7 may further comprise a plurality of liquid storage chambers 8, and different types of laundry treatment additives are respectively stored in the liquid storage chambers, so as to be simultaneously or separately dispensed into the temporary storage chamber. Meanwhile, when the plurality of liquid storage chambers 8 are provided, the liquid storage chambers 8 may be respectively communicated with the flushing water flow path 4 through different liquid dispensing channels, or may alternatively be communicated with the flushing water flow path 4 through the same liquid dispensing channel. An embodiment of the present invention further introduces an additive dispensing method for an additive dispensing device, comprising: dispensing the additive in the liquid storage chamber into the flushing water flow path; introducing a flushing water flow into the flushing water flow path, wherein the flushing water flow flushes the dispensed additive into the temporary storage chamber and mixes with the additive to form an additive mixed liquid; introducing a supply water flow into the water supply flow path, wherein when the supply water flow flows through the negative-pressure tube, negative pressure is generated at the negative-pressure suction port of the negative-pressure tube, and the negative pressure jointly draws the additive mixed liquid in the temporary storage chamber and external air into the water supply flow path; and when the additive mixed liquid and the external air jointly flow into the water supply flow path, mixing the additive mixed liquid and the external air with each other and forming foam, wherein the additive mixed liquid containing foam is dispensed outwardly together with the supply water flow. In an embodiment of the present invention, the additive dispensing method described above may be applied to the additive dispensing device described in the above embodiments of the present invention, and may also be applied to any other type of additive dispensing device. In an embodiment of the present invention, during execution of an additive dispensing program by the washing machine, the steps in the additive dispensing method described above may be sequentially executed to complete foamed dispensing of the additive. Alternatively, during the dispensing process, the steps may be cyclically executed multiple times in sequence, so that the additive is dispensed in batches after being foamed, which can also achieve the above effect of foamed dispensing of the additive and intensive washing of laundry in the drum. In an embodiment of the present invention, a single total amount of the additive mixed liquid mixed and formed in the temporary storage chamber is smaller than an amount corresponding to a maximum liquid level of the temporary storage chamber, and a maximum liquid level height of the temporary storage chamber is lower than a position where the negativepressure suction port of the negative-pressure tube is communicated with external air, so as to ensure that the additive mixed liquid in the temporary storage chamber does not flow out through the air inlet. An embodiment of the present invention further introduces a washing machine, comprising a washing drum for accommodating a load to be treated, and further comprising any one of the additive dispensing devices described above. An inlet of the water supply flow path and an inlet of the flushing water flow path of the additive dispensing device are respectively communicated with a water inlet pipe of the washing machine. An outlet of the water supply flow path is connected to a liquid outlet structure. The liquid outlet structure is provided on a housing, and / or a door body, and / or a water drum, and / or a window gasket of the washing machine. The liquid outlet structure sprays, toward the washing drum of the washing machine, a mixture having foam and formed by mixing the additive and supply water. Meanwhile, in an embodiment of the present invention, the additive dispensing device shown in FIG. 3 to FIG. 7 and the additive dispensing device shown in FIG. 8 to FIG. 13 may also be integrally provided, that is, the respective structures in the different drawings described above may be simultaneously integrated and mounted on the same additive dispensing device. As shown in FIG. 1 to FIG. 13, in this embodiment, a top of the water box 2 of the additive dispensing device 100 is the upper cover 3. The water supply flow path 1, the flushing water flow path 4, the dispensing pipeline 11, the air intake pipeline 10, and other water path structures may all be provided inside the upper cover 3. The outlet of the water supply flow path 1 is exposed at an outer peripheral side of the upper cover 3. An inlet end of the conduit 600 is communicated with the outlet of the water supply flow path 1, and an outlet end of the conduit 600 is communicated with the liquid outlet structure 500 provided outside the water box 2. Preferably, the upper cover 3 comprises an upper cover body 31 and a lower cover body 32 fastened to each other vertically. The upper cover body 31 and the lower cover body 32 are spliced opposite to each other, and the water supply flow path 1, the flushing water flow path 4, the dispensing pipeline 11, the air intake pipeline 10, and other water path structures are formed at a joint surface therebetween. Further preferably, the upper cover body 31 and the lower cover body 32 of the upper cover 3 are connected by a welding process, so as to form a closed, pressure-resistant water path structure inside. Thus, the water path structure of the additive dispensing device 100 can be integrated on the upper cover 3, so that inlet water and the additive of the dispensing device 100 are directly dispensed through the water supply flow path 1 inside the upper cover 3, thereby realizing the effect that the additive directly flows outwardly from an outlet on the outer peripheral side of the upper cover 3 for dispensing. Of course, the water supply flow path 1, the flushing water flow path 4, the dispensing pipeline 11, the air intake pipeline 10, and other water path structures may also be configured as independent pipelines. In this embodiment, the dispensing unit comprises a liquid storage chamber for storing the additive, and the liquid storage chamber is communicated with the water supply flow path 1. The dispensing device 100 is further provided with a power unit, which provides power for drawing the additive in the liquid storage chamber into the water supply flow path. In this embodiment, the power unit may be a pump provided on a liquid suction flow path connected between the liquid storage chamber and the water supply flow path 1, and provides, for liquid in the liquid suction flow path, a driving force for flowing from the liquid storage chamber toward the water supply flow path 1. In this embodiment, the power unit may also be provided as another existing structure. For example, the power unit may be a suction pump, a suction port of the suction pump being communicated with the water supply flow path 1, so that negative pressure is formed in the water supply flow path 1 and the additive in the liquid storage chamber is drawn into the water supply flow path 1 through the liquid suction flow path. And / or, the power unit may also be a Venturi tube provided on the water supply flow path 1. The Venturi tube is provided with a negative-pressure region having an abrupt change in pipe diameter, and the negative-pressure region can form negative pressure by using water flowing therethrough. A suction port is provided in the negative-pressure region of the Venturi tube, and the suction port is communicated with the liquid storage chamber through the liquid suction flow path, which is not shown in the accompanying drawings. In this embodiment, the additive dispensing device 100 comprises a plurality of liquid storage chambers. Each liquid storage chamber may respectively contain a different type of additive, such as detergent, softener, fragrance additive, disinfectant, and the like. A control device is provided on the dispensing device 100 and is configured to control one of the liquid storage chambers, or a combination of the liquid storage chambers, to be communicated with the water supply flow path 1, so as to correspondingly dispense any one type of additive into the water supply flow path 1, or simultaneously dispense a plurality of types of additives in combination. In this embodiment, the control device may be configured as any existing structure capable of realizing the above function. For example, in this embodiment, each liquid storage chamber may be communicated with the water supply flow path 1 through a flow path provided with a control valve, respectively, so that the opening and closing of the respective control valves are controlled to realize separate or combined on-off control of the respective flow paths, thereby realizing the purpose of independently dispensing any one type of additive or simultaneously 5 dispensing a plurality of types of additives. Alternatively, the respective liquid storage chambers may be communicated one-to-one with different inlets of the same reversing valve, an outlet of the reversing valve is communicated with the water supply flow path 1, and a rotatable valve core is provided in the reversing valve and is configured to control any one inlet or a combination of inlets to be communicated with the outlet, thereby also realizing the purpose of 10 independently dispensing any one type of additive or simultaneously dispensing a plurality of types of additives, which is not shown in the accompanying drawings. In this embodiment, a liquid storage box is provided in the water box 2 of the dispensing device 100, and the liquid storage box is mounted in the water box 2 of the additive dispensing device 100 in a manner of being drawable outwardly. At least one liquid storage chamber for 15 storing an additive is provided in the liquid storage box. Each liquid storage chamber on the liquid storage box is communicated with the water supply flow path 1 through a communicating device, and a control device is provided on the communicating device and is configured to control the respective liquid storage chambers to be selectively or collectively, and controllably, communicated with or disconnected from the water supply flow path 1. In this embodiment, an inlet of the water supply flow path 1 is provided on an outer wall of the water box 2, and the inlet of the water supply flow path 1 is communicated with a water supply source, so that an inlet water flow can flow into the water supply flow path 1. In this embodiment, the additive dispensing device 100 is mounted on a washing machine, and the water supply source of the additive dispensing device is a water inlet pipe of the washing machine. The inlet of the water supply flow path 1 and an inlet of the flushing water flow path 4 are respectively communicated with the water inlet pipe of the washing machine in a controllably openable and closable manner, so that washing inlet water can flow into the water supply flow path 1 and / or the flushing water flow path 4 through the inlets. A water inlet joint is provided on the water box 2 of the additive dispensing device 100, and two ends of the water inlet joint are respectively communicated with the inlet of the water supply flow path 1, the inlet of the flushing water flow path 4, and the water inlet pipe of the washing machine. Further preferably, a control valve for controlling on-off of the water paths is mounted at the water inlet joint; the inlet of the water supply flow path 1 is provided with a first switch valve 13 for controlling on-off of the water path, and the inlet of the flushing water flow path 4 is provided with a second switch valve 14 for controlling on-off of the water path. By providing the additive dispensing device 100 on the washing machine, the additive of the washing machine directly flows through the water supply flow path 1 to the liquid outlet structure 500 and is directly sprayed into the washing drum 300 by the liquid outlet structure 500. Thus, the additive of the washing machine does not pass through the water box or the water tub 200 outside the washing drum 300, but directly flows from the water path of the dispensing device 100 into the washing drum 300 and is sprayed onto the load to be treated, thereby realizing the purpose of directly spraying the additive solution onto the load to be treated in the washing drum 300. Meanwhile, with the above arrangement, the washing machine equipped with the additive dispensing device 100 can realize that an additive solution formed by mixing the additive with a small amount of inlet water in the water supply flow path 1 is directly sprayed onto the load to be treated in the washing drum 300, thereby significantly improving the utilization rate of the dispensed additive. In this embodiment, a liquid suction port is provided in a middle portion of the flushing water flow path 4, and the liquid suction port is communicated with the dispensing unit 7, so that the additive is drawn into the flushing water flow path 4 from the liquid suction port. Preferably, the flushing water flow path 4 is communicated with an outlet of a pump or with an outlet of a Venturi tube for liquid suction; an inlet of the pump, or a negative-pressure port of the Venturi tube, is communicated with an outlet of the liquid dispensing channel 71; an inlet of the liquid dispensing channel 71 is communicated with an outlet of a communicating device; and a plurality of inlets of the communicating device are communicated with the respective liquid storage chambers 8 in one-to-one correspondence, thereby realizing the purpose that the additive in the liquid storage chamber 8 is drawn into the liquid dispensing channel 71 through the above flow paths under the driving action of the pump or the Venturi tube for liquid suction. In this embodiment, the liquid outlet structure 500 may be provided on the housing, and / or the door body, and / or the water drum 200, and / or the window gasket 400 of the washing machine. A spray outlet of the liquid outlet structure 500 is opened toward the inside of the washing drum 300, and the additive sprayed from the liquid outlet structure 500 is directly sprayed into the washing drum 300. Preferably, in this embodiment, a specific mounting manner of the liquid outlet structure 500 is as follows: As shown in FIG. 1 to FIG. 2, a ring-shaped window gasket 400 is mounted at a drum opening of the water drum 200. The window gasket 400 is cylindrical. One end of the cylindrical window gasket 400 is connected to the drum opening of the water drum 200, and the other end is connected to the housing of the washing machine, so as to form a passage. The drum opening of the washing drum 300 is oppositely communicated with one end of the passage. The housing of the washing machine is provided with a laundry loading opening correspondingly communicated with the other end of the passage. A door body capable of correspondingly opening and closing the laundry loading opening is mounted on the housing of the washing machine. After the door body is closed, a sealed space is formed inside the water drum 200. A gap space is provided between the door body and the window gasket 400, and the gap space is directly communicated with the inside of the washing drum 300 through the drum opening of the washing drum 300. The liquid outlet structure 500 is mounted at the top of the window gasket 400. The liquid outlet structure 500 passes through the window gasket 400. A portion of the liquid outlet structure 500 located on an inner circumferential side of the window gasket 400 has a spray outlet, and a portion located on an outer circumferential side of the window gasket 400 has an inlet. A flow path is provided inside the liquid outlet structure 500, and two ends of the flow path are respectively communicated with the inlet and the spray outlet. The spray outlet is arranged toward the drum opening direction of the washing drum 300, so that the additive solution sprayed from the liquid outlet structure 500 can be directly sprayed into the washing drum 300, thereby realizing significant technical progress of directly spraying the additive onto the load to be treated in the washing drum 300 and improving the additive dispensing efficiency. In this embodiment, the liquid outlet structure 500 may be any existing spray structure. The spray outlet may be configured as a plurality of spray small holes arranged at intervals, or may be configured as a single opening. In this embodiment, an independently arranged conduit 600 is provided in the washing machine, located outside the water box of the additive dispensing device 100 and outside the water drum 200. Two ends of the conduit 600 are respectively inserted into and communicated with the inlet of the liquid outlet structure 500 and the outlet of the water supply flow path 1, so that the additive solution supplied by the water supply flow path 1 can be directly guided through the conduit 600 to the liquid outlet structure 500, thereby realizing the effect of directly spraying and dispensing the additive solution into the washing drum 300 of the washing machine. Preferably, the conduit 600 is made of rubber or the like, and can itself be bent and deformed. The above descriptions are merely preferred embodiments of the present invention and do not limit the present invention in any form. Although the present invention has been disclosed above by way of preferred embodiments, the embodiments are not intended to limit the present invention. Any person skilled in the art may make some changes or modifications to equivalent embodiments by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments according to the technical essence of the present invention, without departing from the contents of the technical solution of the present 5 invention, shall still fall within the scope of the solution of the present invention.

Claims

1. An additive dispensing device, comprising:a water supply flow path, configured to allow water to flow therethrough;a dispensing unit, configured to dispense an additive into the water supply flow path, so that the additive is mixed with a water flow to form an additive mixed liquid;wherein:a Venturi tube is provided on the water supply flow path, a negative-pressure suction port of the Venturi tube is communicated with external atmosphere, so that under the action of liquid flowing through the Venturi tube, external air enters from the negative-pressure suction port and is mixed with the additive mixed liquid, for exciting the additive mixed liquid to generate foam.

2. The additive dispensing device according to claim 1, wherein:a mounting portion radially protruding from an inner wall of the water flow path is provided in the water supply flow path, and the water supply flow path is divided by the mounting portion into an upstream portion and a downstream portion; andthe Venturi tube provided on the water supply flow path is mounted on the mounting portion, and two ends of a pipeline of the Venturi tube are respectively communicated with the upstream portion and the downstream portion of the water supply flow path.

3. The additive dispensing device according to claim 2, wherein:a ventilation chamber is provided below the mounting portion, and the ventilation chamber is communicated with external atmosphere through a ventilation passage; andthe negative-pressure suction port of the Venturi tube is opened downwardly, and a notch for communicating the negative-pressure suction port with the ventilation chamber is provided on the mounting portion, so that the Venturi tube is communicated with the same ventilation chamber.

4. The additive dispensing device according to claim 3, wherein:the additive dispensing device comprises a water box, and the water supply flow path is integrally provided in an upper cover of the water box;the upper cover is formed by vertically fastening an upper cover body and a lower cover body, and concave-convex structures arranged in cooperation are provided on opposite facing surfaces of the upper cover body and the lower cover body, so that the water supply flow path is formed between the two cover bodies;the upper cover body is provided with the mounting portion which is protruded downwardly, is formed by a block-shaped structure, and is located inside the water supply flow path, and the Venturi tube is inserted and mounted on the same mounting portion to communicate the water supply flow path on two sides of the mounting portion; andthe lower cover body is provided with a groove-shaped structure downwardly recessed and having an opening on an upper, and the mounting portion is correspondingly fastened at the opening of the upper of the groove-shaped structure, so that the groove-shaped structure forms the ventilation chamber.

5. The additive dispensing device according to claim 4, wherein:a plurality of branch passages horizontally spaced apart from one another are provided in the mounting portion with the block-shaped structure, and two ends of each of the branch passages arerespectively communicated with corresponding two sides of the mounting portion with the blockshaped structure;the Venturi tube is coaxially inserted and mounted in each of the branch passages, and two ends of the Venturi tube are respectively communicated with the upstream portion and the downstream portion of the water supply flow path on the corresponding two sides of the mounting portion with the block-shaped structure;the notch is provided on a lower side of the mounting portion with the block-shaped structure, and the notch is located directly below the negative-pressure suction port of the Venturi tube, so as to communicate an inside of the pipeline of the Venturi tube with the ventilation chamber;two sealing rings are provided on an outer tube wall of the Venturi tube, and the two sealing rings are respectively located on an upstream side and a downstream side of the notch, so as to seal a gap between the Venturi tube and the branch passages; andpreferably, a semi-annular opening opened downwardly and arranged around half a circumference of a tube wall is provided on the tube wall of the Venturi tube, the semi-annular opening is provided directly above the notch being in strip-shaped, and a width of the semi-annular opening is smaller than a width of the notch being in strip-shaped.

6. The additive dispensing device according to claim 5, wherein:each of the branch passages is a straight pipe section having an axis extending in a horizontaldirection;the Venturi tube comprises a liquid inlet pipe section and a liquid outlet pipe section coaxially connected to each other, wherein the liquid inlet pipe section has a smaller pipe diameter than the liquid outlet pipe section;the liquid inlet pipe section having a small pipe diameter is correspondingly and coaxially inserted in the each of the branch passages, and the liquid outlet pipe section having a large pipe diameter is located outside the mounting portion with the block-shaped structure and in the downstream portion of the water supply flow path;a radial dimension of an outer circumference of the tube wall of the liquid inlet pipe section is equal to a radial dimension of an inner circumferential pipe of the each of the branch passages;an end surface at which the liquid inlet pipe section is connected to the liquid outlet pipe section is abutted against one side of the mounting portion facing the downstream portion of the water supply flow path;preferably, one end of the each of the branch passages communicated with the upstream portion of the water supply flow path is provided with a ring of annular stop edge radially protruding inwardly, and an inner circumferential radial dimension of the annular stop edge is smaller than an outer circumferential radial dimension of the tube wall of the liquid inlet pipe section of the Venturi tube; andpreferably, a mounting protrusion outwardly protruding is provided on the outer tube wall of the liquid outlet pipe section, a mounting post upwardly protruding is provided on the lower cover body, the mounting protrusion is correspondingly placed on a top of the mounting post, and a screwpasses through the mounting protrusion from top to bottom and is threadedly engaged with and mounted to the mounting post.

7. The additive dispensing device according to any one of claims 1 to 6, wherein:a bottom wall and a top wall of the water supply flow path on an upstream side of the Venturi tube are both inclined surfaces gradually rising along a liquid flow direction, two inclined surfaces are parallel to each other, and a spacing distance therebetween is greater than a radial dimension of an outer tube wall of the Venturi tube;a bottom wall and a top wall of the water supply flow path on a downstream side of the Venturi tube are both planes, two planes are parallel to each other, and a spacing distance therebetween is greater than the radial dimension of the outer tube wall of the Venturi tube;a distance between the two inclined surfaces is smaller than a distance between the two planes;preferably, the plane of the bottom wall of the water supply flow path on the downstream side of the Venturi tube is flush in height with a lowest point of the inclined surface of the bottom wall of the water supply flow path on the upstream side of the Venturi tube; andthe plane of the top wall of the water supply flow path on the downstream side of the Venturi tube is flush in height with a highest point of the inclined surface of the top wall of the water supply flow path on the upstream side of the Venturi tube.

8. The additive dispensing device according to any one of claims 1 to 6, wherein:the Venturi tube is divided, from a liquid inlet end toward a liquid outlet end, into three pipe sections of a constricted pipe section, a straight pipe section, and a flared pipe section that are sequentially communicated and coaxially arranged;the constricted pipe section is a conical pipe section having an inner diameter gradually narrowed along a liquid flow direction;the straight pipe section is a cylindrical pipe section having a constant bore diameter, and a diameter of the straight pipe section is greater than or equal to a maximum pipe diameter of the constricted pipe section, or greater than or equal to a maximum pipe diameter of the flared pipe section;the flared pipe section is a conical pipe section having an inner diameter gradually enlarged along the liquid flow direction;a semicircular opening extending along a circumferential direction of the straight pipe section is provided on a lower portion of a tube wall of the straight pipe section, and the semicircular opening constitutes the negative-pressure suction port; andpreferably, the negative-pressure suction port covers at least one-third of a height portion of the lower portion of the tube wall of the straight pipe section.

9. The additive dispensing device according to any one of claims 1 to 8, wherein:a mixing structure is provided in the upstream portion of the water supply flow path upstream of the Venturi tube, a position where the dispensing unit is communicated with the water supply flow path is located upstream of the mixing structure, and the dispensed additive and supply water are mixed in the mixing structure to form the additive mixed liquid.

10. An additive dispensing device, comprising:a water supply flow path, configured to allow water to flow therethrough;a flushing water flow path, communicated with a temporary storage chamber and configured to allow flushing water to flow therethrough;a dispensing unit, configured to dispense an additive into the flushing water flow path and / or the temporary storage chamber, so that the flushing water flow and the dispensed additive jointly enter the temporary storage chamber and are mixed to form an additive mixed liquid; anda negative-pressure tube provided on the water supply flow path, wherein a negative-pressure suction port of the negative-pressure tube is respectively communicated with external atmosphere and the temporary storage chamber;wherein when a water flow flows through the negative-pressure tube, negative pressure is generated at the negative-pressure suction port, and the negative pressure is used to simultaneously draw external air and the additive mixed liquid in the temporary storage chamber into the water supply flow path from the negative-pressure suction port, for exciting foam generation.

11. The additive dispensing device according to any one of claims 1 to 9, comprising:the water supply flow path, configured to allow supply water to flow therethrough;a flushing water flow path, communicated with a temporary storage chamber and configured to allow flushing water to flow therethrough;the dispensing unit, configured to dispense an additive into the flushing water flow path and / or the temporary storage chamber, so that the flushing water flow and the dispensed additive jointly enter the temporary storage chamber and are mixed to form an additive mixed liquid; anda negative-pressure tube provided on the water supply flow path, wherein a negative-pressure suction port of the negative-pressure tube is respectively communicated with external atmosphere and the temporary storage chamber;wherein when a supply water flow flows through the negative-pressure tube, negative pressure is generated at the negative-pressure suction port, and the negative pressure is used to simultaneously draw external air and the additive mixed liquid in the temporary storage chamber into the water supply flow path from the negative-pressure suction port, for exciting foam generation.

12. The additive dispensing device according to claim 10 or 11, wherein:the negative-pressure tube comprises a Venturi tube, and a liquid inlet end and a liquid outlet end of the Venturi tube are both communicated with the water supply flow path, so as to allow the supply water flow to flow through the Venturi tube;the Venturi tube comprises a constricted pipeline, a negative-pressure straight pipeline, and a flared pipeline sequentially communicated from the liquid inlet end toward the liquid outlet end;the negative-pressure suction port for communicating the inside and outside of negativepressure straight pipeline is provided on a pipe wall of the negative-pressure straight pipeline;the negative-pressure suction port is communicated with the temporary storage chamber through a dispensing pipeline, and is configured to draw the additive mixed liquid in the temporary storage chamber; andan air inlet is provided in a middle portion of the dispensing pipeline, and the air inlet is communicated with external atmosphere through an air intake pipeline and is configured to draw in external air.

13. The additive dispensing device according to claim 12, wherein:a one-way check structure for preventing the additive mixed liquid flowing through the dispensing pipeline from being discharged outwardly through the air intake pipeline is provided on the air intake pipeline and / or at a position where the air intake pipeline is communicated with the dispensing pipeline;preferably, the air inlet where the air intake pipeline is communicated with the dispensing pipeline is a hole for preventing the additive mixed liquid from flowing outwardly; andfurther preferably, the air inlet is a small hole having a bore diameter smaller than 5 mm.

14. The additive dispensing device according to claim 13, wherein:the dispensing pipeline comprises a horizontal pipe section and a vertical pipe section, one end of the horizontal pipe section is communicated with the negative-pressure suction port arranged on one side of a pipe wall horizontally extending of the Venturi tube, an other end of the horizontal pipe section is communicated with an upper end of the vertical pipe section, a lower end of the vertical pipe section is communicated with a bottom of the temporary storage chamber, and the air inlet is provided in a middle portion of the horizontal pipe section;a maximum liquid level height of the additive mixed liquid is provided in the temporary storage chamber, and a space of the temporary storage chamber above the maximum liquid level height is a ventilation portion; andthe ventilation portion is respectively communicated with the air intake pipeline and the air inlet provided on the dispensing pipeline, so that the air inlet provided on the dispensing pipeline is communicated with the air intake pipeline through the ventilation portion of the temporary storage chamber.

15. The additive dispensing device according to claim 14, wherein:a chamber with ventilation and liquid intake is provided on one side of the temporary storage chamber, and the chamber with ventilation and liquid intake is communicated with the ventilation portion of the temporary storage chamber;a bottom wall of the chamber with ventilation and liquid intake is higher than the maximum liquid level height in the temporary storage chamber, and a top of the chamber with ventilation and liquid intake is flush with a top of the temporary storage chamber; andthe air intake pipeline and the flushing water flow path are both communicated with the chamber with ventilation and liquid intake, and the air inlet provided on the dispensing pipeline is communicated with the top of the chamber with ventilation and liquid intake.

16. The additive dispensing device according to claim 15, wherein:a first side and a second side of the chamber with ventilation and liquid intake are opposite to each other, the first side is communicated with the temporary storage chamber, the second side is communicated with the air intake pipeline and the flushing water flow path, and the bottom wall of the chamber with ventilation and liquid intake is gradually inclined downwardly from the firstside toward the second side; andthe air intake pipeline and the flushing water flow path are respectively provided at adjacent two ends of the first side of the chamber with ventilation and liquid intake, and inlet orientations of the air intake pipeline and the flushing water flow path are perpendicular to each other.

17. The additive dispensing device according to claim 15, wherein:the air inlet is located directly above a position where the chamber with ventilation and liquid intake is communicated with the ventilation portion of the temporary storage chamber, and is configured to communicate a lowest position in a middle portion of the dispensing pipeline and the chamber with ventilation and liquid intake and with a top space of the temporary storage chamber, so that the air inlet of the dispensing pipeline is communicated with the air intake pipeline through the ventilation portion at the top of the temporary storage chamber and the chamber with ventilation and liquid intake, and is configured to draw air from external atmosphere into the dispensing pipeline.

18. The additive dispensing device according to any one of claims 10 to 17, wherein:the dispensing unit comprises a dispensing pipeline, a liquid storage chamber, and a dispensing pump;two ends of the dispensing pipeline are respectively communicated with the liquid storage chamber and the flushing water flow path, and the dispensing pump is provided on the dispensing pipeline and is configured to generate a driving force when the dispensing pump operates, so as to draw additive in the liquid storage chamber into the flushing water flow path; andpreferably, a one-way valve for one-way communication of the dispensing pipeline is provided on the dispensing pipeline, and is configured to control the additive to flow only from the liquid storage chamber toward the flushing water flow path.

19. An additive dispensing method for an additive dispensing device, comprising:dispensing an additive in a liquid storage chamber into a flushing water flow path;introducing a flushing water flow into the flushing water flow path, and the flushing water flow flushing the dispensed additive into a temporary storage chamber to form an additive mixed liquid;introducing a supply water flow into a water supply flow path;wherein when the supply water flow flows through a negative-pressure tube, negative pressure is generated at a negative-pressure suction port of the negative-pressure tube, and the negative pressure jointly draws the additive mixed liquid in the temporary storage chamber and external air into the water supply flow path; andwhen the additive mixed liquid and the external air jointly flow into the water supply flow path, the additive mixed liquid and the external air are mixed with each other and form foam, and the additive mixed liquid containing foam is dispensed outwardly together with the supply water flow.

20. The additive dispensing method for the additive dispensing device according to claim 19, wherein:a single total amount of the additive mixed liquid formed in the temporary storage chamber is smaller than an amount corresponding to a maximum liquid level of the temporary storagechamber, and a maximum liquid level height of the temporary storage chamber is lower than a position where the negative-pressure suction port of the negative-pressure tube is communicated with external air, so that the additive mixed liquid in the temporary storage chamber does not flow out through the air inlet.

21. A washing machine, comprising a washing drum for accommodating a load to be treated, andthe washing machine further comprises the additive dispensing device according to any one of claims 1 to 20;wherein an inlet of the water supply flow path of the additive dispensing device is communicated with a water inlet pipe of the washing machine;an outlet of the water supply flow path is connected to a liquid outlet structure;the liquid outlet structure is provided on a housing, a door body, a water drum, and / or a window gasket of the washing machine; andthe liquid outlet structure is configured to spray, toward the washing drum of the washing machine, a mixture having foam and formed by mixing the additive and supply water.

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