Detergent dispensing device and washing machine

Abstract

The present invention provides a detergent dispensing device and a washing machine, comprising a dispensing cavity, a first chamber is arranged in the dispensing cavity, dispensing liquid is stored in the first chamber, the first chamber is connected to a constant volume cavity through a liquid suction pipe, the constant volume cavity is connected to a water inlet valve through two venturi tube structures, the negative pressure pipes of the two venturi tube structures are connected to the constant volume cavity, a one-way valve and / or a float valve are arranged in the two negative pressure pipes and the liquid suction pipe, and the dispensing liquid flows to the constant volume cavity or the dispensing liquid in the constant volume cavity is dispensed to the dispensing cavity by changing the water inlet state of the two venturi tubes. The present invention forms a double venturi negative pressure single dispensing automatic dispensing component by arranging two venturi tube structures, completes the absorption and dispensing of the dispensing liquid in the form of double negative pressure, has a reasonable structure, and is precisely controlled, greatly simplifies the control structure of automatic detergent dispensing, and reduces production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a detergent dispensing device and a washing machine. Background Art

[0002] At present, all washing machine manufacturers have launched washing machines with automatic dispensing functions. This type of washing machine can realize the intelligent addition of detergent, avoiding users from adding detergent manually, which is more convenient and has a good user experience. With the advancement of science and technology and the improvement of washing machine functions, users have higher and higher requirements for automatic detergent dispensing technology for washing machines. The detergent dispensing device in the related technology generally adopts piston pumps, centrifugal pumps, peristaltic pumps and solenoid valves to directly dispense detergent into the water tub, but the detergent and water mixed in this way are poor, which not only affects the washing performance, but also damages the clothes due to direct contact between the detergent and the clothes. In addition, the structure of this type of detergent dispensing device is complex and the cost is relatively high.

[0003] Currently, various detergent dispensing devices generally consist of three parts: a detergent storage box, a water inlet box, and a dispensing device. The detergent stored in the detergent storage box is dispensed into the water inlet box through the dispensing device and flows into the washing tub for washing the user's clothes. This device is relatively complex, high in cost, complex in assembly, and has high requirements for process and component precision. Summary of the invention

[0004] In view of this, the present invention now provides a detergent dispensing device and a washing machine, which form a double-Venturi negative pressure automatic dispensing component by setting two Venturi tube structures, simplifying the dispensing structure, reducing the coordination of parts, and improving the reliability and stability of parts.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A detergent dispensing device comprises a dispensing cavity, wherein a first chamber is arranged in the dispensing cavity, dispensing liquid is stored in the first chamber, the first chamber is connected to a constant volume cavity via a liquid suction pipe, the constant volume cavity is connected to a water inlet valve via two venturi tube structures, negative pressure tubes of the two venturi tube structures are connected to the constant volume cavity, one-way valves and / or float valves are arranged in the two negative pressure tubes and the liquid suction pipe, and by changing the water inlet state of the two venturi tubes, the dispensing liquid flows into the constant volume cavity or the dispensing liquid in the constant volume cavity is dispensed into the dispensing cavity.

[0007] The present invention forms a double-Venturi negative pressure automatic delivery component by arranging two Venturi tube structures, and completes the absorption and delivery of delivery liquid in the form of double negative pressure. It has a reasonable structure and precise control, which greatly simplifies the control structure of automatic detergent delivery and reduces production costs.

[0008] Furthermore, the two Venturi tube structures are respectively a first Venturi tube structure and a second Venturi tube structure. The first Venturi tube structure is connected to the constant volume chamber through a first negative pressure tube, and the second Venturi tube structure is connected to the constant volume chamber through a second negative pressure tube. The first Venturi tube structure is connected to the water inlet valve through a first water inlet pipe port, and the second Venturi tube structure is connected to the water inlet valve through a second water inlet pipe port. The water inlet valve can let water into the second water inlet pipe port and the first water inlet pipe port separately and / or simultaneously.

[0009] This arrangement provides a method of connecting two venturi tube structures with a constant volume chamber and a water inlet valve, and by controlling the water inlet valve to feed water into the venturi tube separately or simultaneously, the absorption or discharge of the liquid placed in the constant volume chamber is achieved.

[0010] Furthermore, a float valve is arranged in the first negative pressure tube, and a liquid suction one-way valve is arranged in the liquid suction tube. Floats are arranged in the float valve and the liquid suction one-way valve. The density of the float in the float valve is less than the density of the liquid put into the constant volume chamber, and the density of the float in the liquid suction one-way valve is greater than the density of the liquid put into the constant volume chamber.

[0011] This setting ensures the reliability of the double Venturi negative pressure tube in extracting the released liquid when negative pressure is formed in the constant volume chamber, and the relative setting of the float density and the density of the released liquid can achieve the constant volume of the released liquid, which is accurate and reliable.

[0012] Furthermore, a liquid discharge one-way valve is arranged in the second negative pressure pipe, a floating ball is arranged in the liquid discharge one-way valve, and the density of the floating ball in the liquid discharge one-way valve is greater than the density of the liquid put into the constant volume chamber.

[0013] This arrangement enables the discharge one-way valve to close the second negative pressure tube when the second negative pressure tube does not generate negative pressure, further ensuring the accuracy of the constant volume chamber in extracting and administering liquid.

[0014] Furthermore, a second chamber is provided in the delivery cavity, and a water leakage port is provided at the bottom of the second chamber.

[0015] This arrangement enables the detergent dispensing device of the present invention to automatically dispense washing liquid and washing powder, thus meeting the multifunctional requirements of the detergent dispensing device.

[0016] Furthermore, the first venturi tube structure is also connected to an overflow box. After water enters the first water inlet, it flows to the overflow box through the first water outlet. An overflow pipe is provided on the overflow box. The overflow pipe is provided near the upper part of the overflow box to direct excess water in the overflow box to the washing bucket or the second chamber or the delivery cavity.

[0017] Furthermore, the water inlet of the overflow pipe on the overflow box is not higher than the first water outlet of the overflow box, or the height of the first water outlet on the overflow box is higher than the liquid level of the liquid contained in the constant volume chamber.

[0018] This arrangement further ensures that the overflow box can store water when the first venturi tube structure is working, and discharges water into the constant volume chamber when the liquid in the constant volume chamber is released, thereby ensuring the reliability of the overflow box storing water and flushing the constant volume chamber.

[0019] Furthermore, the second water outlet of the second venturi tube structure is connected to the delivery chamber through a long drainage pipe.

[0020] This arrangement allows the liquid placed in the constant volume chamber or the flushing liquid flowing into the constant volume chamber from the overflow box to pass through the second Venturi tube structure and the long drain pipe. Even when the water inlet is stopped, the long drain pipe can produce a siphon effect, thereby emptying the constant volume chamber.

[0021] Furthermore, it includes a drawer box base and a drawer box cover, a delivery cavity is formed between the drawer box base and the drawer box cover, a detergent cover plate and a top cover plate are sequentially arranged above the drawer box cover plate, and the fixed volume cavity is formed between the top cover plate and the detergent cover plate.

[0022] This arrangement discloses a specific structure capable of realizing the double Venturi negative pressure automatic delivery washing device as described above, which has a compact structure, strong applicability, and can be applied to most existing washing machine structures.

[0023] Compared with the prior art, the detergent dispensing device and washing machine described in the present invention have the following advantages: by setting two Venturi tube structures, a double Venturi negative pressure automatic dispensing component is formed, and the absorption and dispensing of the dispensing liquid are completed in the form of double negative pressure, which simplifies the dispensing structure, reduces the coordination of parts, improves the reliability and stability of parts, and reduces production costs.

[0024] Another object of the present invention is to provide a washing machine comprising the detergent dispensing device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting 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 their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the detergent dispensing device according to an embodiment of the present invention;

[0027] Figure 2 This is a water inlet state diagram of the first water inlet pipe in the detergent dispensing device according to an embodiment of the present invention;

[0028] Figure 3 This is a diagram showing the water inlet state of the second water inlet pipe in the detergent dispensing device according to an embodiment of the present invention;

[0029] Figure 4 A reference diagram of the first relative position setting of the overflow box in the detergent dispensing device according to the embodiment of the present invention when water flows into the constant volume chamber;

[0030] Figure 5 A reference diagram for the second relative position setting of the overflow box in the detergent dispensing device according to an embodiment of the present invention when water flows into the constant volume chamber;

[0031] Figure 6 A schematic side view of the structure of the detergent dispensing device according to an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the structure of the detergent dispensing device according to an embodiment of the present invention without the top cover plate;

[0033] Figure 8 for Figure 7 A schematic diagram of the structure from above;

[0034] Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure of AA;

[0035] Fig.10 for Figure 8 Schematic diagram of the cross-sectional structure of the middle BB;

[0036] Fig.11 for Figure 7 The side view of the middle structure after removing the drawer box base;

[0037] Description of reference numerals:

[0038] 1. First venturi tube structure; 2. First negative pressure tube; 3. Float valve; 4. Constant volume chamber; 5. Suction check valve; 6. Suction tube; 7. Discharge check valve; 8. Second negative pressure tube; 9. Second water inlet; 10. Second venturi tube structure; 11. Second water outlet; 12. Long drain pipe; 13. Delivery chamber; 14. First chamber; 15. Main drain outlet; 16. Second chamber; 17. Leakage outlet; 18. Overflow box; 19. Overflow pipe; 20. First water outlet; 21. First water inlet; 22. Water inlet valve; 23. Top cover; 24. Shell; 25. Front panel; 26. Handle; 27. Detergent cover; 28. Drawer box cover; 29. ​​Drawer box base. DETAILED DESCRIPTION

[0039] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention are described in detail below with reference to specific drawings.

[0040] It should be noted that all the terms used in the present invention for directional and positional indications, such as "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "low", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state (as shown in the accompanying drawings), and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0043] Embodiment 1, as Figures 1 to 5 As shown, the present invention discloses a detergent dispensing device, including a dispensing cavity 13, in which a first chamber 14 is arranged, in which dispensing liquid is stored, the first chamber 14 is connected to a constant volume cavity 4 through a liquid suction pipe 6, the constant volume cavity 4 is connected to a water inlet valve 22 through two venturi tube structures, the negative pressure pipes of the two venturi tube structures are connected to the constant volume cavity 4, a one-way valve and / or a float valve are arranged in the two negative pressure pipes and the liquid suction pipe 6, and by changing the water inlet state of the two venturi tubes, the dispensing liquid flows into the constant volume cavity 4 or the dispensing liquid in the constant volume cavity 4 is dispensed into the dispensing cavity 13.

[0044] As an example of the present invention, the delivery cavity 13 can be a drawer box cavity or a cavity integrated on the washing machine. The two Venturi tube structures are respectively a first Venturi tube structure 1 and a second Venturi tube structure 10. The first Venturi tube structure 1 is connected to the constant volume cavity 4 through a first negative pressure tube 2, and the second Venturi tube structure 10 is connected to the constant volume cavity 4 through a second negative pressure tube 8. The first Venturi tube structure 1 is connected to the water inlet valve 22 through a first water inlet pipe port 21, and the second Venturi tube structure 10 is connected to the water inlet valve 22 through a second water inlet pipe port 9. The water inlet valve 22 can supply water to the second water inlet pipe port 9 and the first water inlet pipe port 21 separately and / or simultaneously.

[0045] The structure works as follows:

[0046] Water enters the first water inlet 21 and enters the first venturi tube structure 1. The first negative pressure tube 2 generates negative pressure, the float valve 3 in the first negative pressure tube 2 opens, the discharge check valve 7 in the second negative pressure tube 8 closes, and the suction check valve 5 in the suction tube 6 opens, and the liquid to be put in is sucked from the first chamber 14 and enters the constant volume chamber 4. When the fixed volume chamber 4 is filled with the put in liquid, or the fixed volume chamber 4 absorbs a fixed amount of put in liquid, the float valve in the suction tube 6 is closed. At this time, the first water inlet 21 continues to take in water, but only water, and the put in liquid no longer enters the constant volume chamber 4.

[0047] Close the water inlet of the first water inlet pipe 21, open the second water inlet pipe 9 to let in water, the second venturi tube structure 10 starts to work, the discharge one-way valve 7 in the second negative pressure tube 8 is opened, and the suction one-way valve 5 in the suction pipe 6 is closed, and the delivery liquid in the constant volume chamber 4 is sucked into the second venturi tube structure 10, and then enters the delivery chamber 13 with the water inlet from the second water inlet pipe 9.

[0048] The present invention forms a double-Venturi negative pressure automatic delivery component by arranging two Venturi tube structures, and completes the absorption and delivery of delivery liquid in the form of double negative pressure. It has a reasonable structure and precise control, which greatly simplifies the control structure of automatic detergent delivery and reduces production costs.

[0049] Preferably, as a preferred example of the present invention, the density of the float in the float valve 3 is less than the density of the liquid placed in the constant volume chamber 4, and the density of the float in the liquid suction check valve 5 is greater than the density of the liquid placed in the constant volume chamber 4. This setting ensures the reliability of the double venturi negative pressure tube in extracting the liquid when a negative pressure is formed in the constant volume chamber, and the relative setting of the float density and the density of the liquid placed can achieve the fixed volume of the liquid placed, which is accurate and reliable.

[0050] During operation, water enters the first water inlet pipe 21 and enters the first venturi tube structure 1. The first negative pressure pipe 2 generates negative pressure, and negative pressure is also generated in the constant volume chamber 4 connected thereto. The float of the liquid suction one-way valve 5 becomes loose, and the liquid suction one-way valve 5 is in an open state. The liquid suction pipe 6 sucks the liquid in the first chamber 14 into the constant volume chamber 4 through the liquid suction one-way valve 5. As the liquid in the constant volume chamber 4 is sucked, the liquid can float the float in the float valve 3. When the capacity in the constant volume chamber 4 reaches the preset capacity, for example, after a period of time T, the time T is a preset time range, such as 3s to 20s, which is set as needed, the float in the float valve 3 closes the float valve 3.

[0051] Then, the first water inlet pipe 21 is closed, and the second water inlet pipe 9 starts to let in water. The second negative pressure pipe 8 in the second venturi tube structure 10 generates negative pressure. At this time, the float in the discharge one-way valve 7 will become loose to a certain extent, and the detergent in the constant volume chamber 4 will flow to the delivery chamber 13 through the discharge one-way valve 7.

[0052] Preferably, the density of the float in the discharge check valve 7 is greater than the density of the liquid put into the constant volume chamber. This arrangement enables the discharge check valve to close the second negative pressure tube when the second negative pressure tube does not generate negative pressure, further ensuring the accuracy of the liquid drawn into the constant volume chamber.

[0053] Preferably, as a preferred example of the present invention, a second chamber 16 is provided in the delivery cavity 13 , the second chamber 16 is used for delivering washing powder, and a water leakage port 17 is provided at the bottom of the second chamber 16 .

[0054] This arrangement enables the detergent dispensing device of the present invention to automatically dispense washing liquid and washing powder, thus meeting the multifunctional requirements of the detergent dispensing device.

[0055] Preferably, as a preferred example of the present invention, the first venturi tube structure 1 is also connected to an overflow box 18. After water enters the first water inlet pipe 21, it flows to the overflow box 18 through the first water outlet 20. An overflow pipe 19 is arranged on the overflow box 18. The overflow pipe 19 is arranged near the upper part of the overflow box 18 to make excess water in the overflow box 18 flow to the washing bucket or the second chamber 16 or the delivery cavity 13.

[0056] When the second venturi tube structure 10 is working, since the overflow pipe 19 is open, when negative pressure is generated in the constant volume chamber 4, the pressure required to make the water in the overflow box 18 flow to the constant volume chamber 4 is less than the pressure required to make the injected liquid flow to the constant volume chamber 4 through the suction tube 6. Therefore, when the second venturi tube structure 10 is working, the second negative pressure tube 8 generates negative pressure, and the injected liquid flows from the constant volume chamber 4 into the injection chamber 13, and the constant volume chamber 4 generates negative pressure. The water in the overflow box 18 flows back into the first negative pressure tube 2 from the first water outlet 20, and then flows to the constant volume chamber 4 to flush the constant volume chamber.

[0057] Preferably, as a preferred example of the present invention, the second water outlet 11 of the second venturi tube structure 10 is connected to the delivery chamber 13 through a long drainage pipe 12 .

[0058] This arrangement allows the liquid added into the constant volume chamber or the flushing liquid flowing into the constant volume chamber 4 from the overflow box 18 to produce a siphon effect through the second venturi tube structure 10 and the long drain pipe 12, even when the water inlet is stopped, thereby emptying the constant volume chamber 4.

[0059] Preferably, as a preferred example of the present invention, the water inlet of the overflow pipe 19 on the overflow box 18 is not higher than the first water outlet 20 of the overflow box 18, or the height of the first water outlet 20 on the overflow box 18 is higher than the liquid level of the liquid contained in the constant volume chamber 4.

[0060] This arrangement further ensures that the overflow box 18 can store water when the first venturi tube structure 1 is working, and releases water into the constant volume chamber 4 when the liquid in the constant volume chamber 4 is added, thereby ensuring the reliability of the overflow box 18 storing water and flushing the constant volume chamber 4.

[0061] Preferably, as a preferred example of the present invention, a main drainage pipe opening 15 is provided at the bottom of the delivery cavity 13 to facilitate the delivery liquid or water in the delivery cavity 13 to flow to the washing bucket.

[0062] Preferably, as a preferred example of the present invention, the washing liquid stored in the first chamber 14 is any one of liquid detergents such as detergent, softener, cleaning agent, bleach, disinfectant, etc.

[0063] Embodiment 2, as Figures 1 to 11 As shown, the present invention discloses a detergent dispensing device, including a drawer box base 29 and a drawer box cover 28, a dispensing cavity 13 is formed between the drawer box base 29 and the drawer box cover 28, a detergent cover 27 and a top cover 23 are sequentially arranged above the drawer box cover 28, the fixed volume cavity 4 is formed between the top cover 23 and the detergent cover 27, and other structures are the same as those in Example 1.

[0064] Preferably, a front plate 25 is provided at the front end of the drawer box base 29 , and a handle 26 is provided on the front plate 25 .

[0065] This arrangement allows the drawer box assembly to be quickly and conveniently opened or pushed in as needed during use.

[0066] Preferably, a shell 24 is provided on the outer side of the drawer box base 29 , and the shell 24 covers the periphery of the drawer box base 29 and is snap-connected with the detergent cover plate 27 .

[0067] This arrangement avoids deformation of the drawer assembly due to external force during use, thereby improving the reliability of the drawer box assembly during use.

[0068] Preferably, the top cover plate 23 is detachably connected to the detergent cover plate 27 and / or the drawer box cover plate 28 and / or the housing 24. As an example of the present invention, the top cover plate 23 is connected to the detergent cover plate 27 by screws.

[0069] Embodiment 3, the present invention further discloses a washing machine, comprising a detergent dispensing device as described in Embodiment 1 or Embodiment 2.

[0070] The washing machine can dispense the liquid in the first chamber 14 multiple times as needed through a control program.

[0071] Preferably, the detergent dispensing device may be an independent external dispensing device, or may be a dispensing device integrated on the washing machine, wherein the dispensing device, the main water inlet valve and the water inlet box on the washing machine form a highly integrated dispensing device.

[0072] Preferably, the detergent dispensing device shares the main water inlet solenoid valve of the washing machine, namely the water inlet valve 22. The solenoid valve may have a corresponding number of control conversion ports according to the type of liquid to be dispensed, so as to control the dispensing of different washing products.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detergent dispensing device, characterized in that: The invention comprises a delivery chamber (13), wherein a first chamber (14) is arranged in the delivery chamber (13), delivery liquid is stored in the first chamber (14), the first chamber (14) is connected to a constant volume chamber (4) via a liquid suction pipe (6), the constant volume chamber (4) is connected to a water inlet valve (22) via two venturi tube structures, negative pressure pipes of the two venturi tube structures are connected to the constant volume chamber (4), one-way valves and / or floating ball valves are arranged in the two negative pressure pipes and the liquid suction pipe (6), and by changing the water inlet state of the two venturi tubes, the delivery liquid flows into the constant volume chamber (4) or the delivery liquid in the constant volume chamber (4) is delivered into the delivery chamber (13); The two venturi tube structures are respectively a first venturi tube structure (1) and a second venturi tube structure (10); the first venturi tube structure (1) is connected to the constant volume chamber (4) via a first negative pressure pipe (2); the second venturi tube structure (10) is connected to the constant volume chamber (4) via a second negative pressure pipe (8); the first venturi tube structure (1) is connected to a water inlet valve (22) via a first water inlet pipe opening (21); the second venturi tube structure (10) is connected to a water inlet valve (22) via a second water inlet pipe opening (9); the water inlet valve (22) is capable of supplying water to the second water inlet pipe opening (9) and the first water inlet pipe opening (21) individually and / or simultaneously; Water enters the first water inlet (21) and enters the first venturi tube structure (1), the first negative pressure tube (2) generates negative pressure, the float valve (3) in the first negative pressure tube (2) opens, the discharge check valve (7) in the second negative pressure tube (8) closes, the suction check valve (5) in the suction tube (6) opens, and the liquid is sucked from the first chamber (14) and enters the constant volume chamber (4); When the constant volume chamber (4) is filled with the injected liquid, or when the constant volume chamber (4) absorbs a fixed amount of injected liquid, the float valve in the liquid suction tube (6) is closed; The water inlet of the first water inlet pipe (21) is closed, and the water inlet of the second water inlet pipe (9) is opened, the second venturi tube structure (10) starts to work, the discharge check valve (7) in the second negative pressure pipe (8) is opened, and the suction check valve (5) in the suction pipe (6) is closed, and the injection liquid in the constant volume chamber (4) is sucked into the second venturi tube structure (10), and then enters the injection chamber (13) along with the water inlet of the second water inlet pipe (9).

2. The detergent dispensing device according to claim 1, characterized in that: A float valve (3) is arranged in the first negative pressure tube (2), and a liquid suction one-way valve (5) is arranged in the liquid suction tube (6). Floats are arranged in the float valve (3) and the liquid suction one-way valve (5). The density of the float in the float valve (3) is less than the density of the liquid placed in the constant volume chamber (4), and the density of the float in the liquid suction one-way valve (5) is greater than the density of the liquid placed in the constant volume chamber (4).

3. The detergent dispensing device according to claim 1, characterized in that: A liquid discharge one-way valve (7) is arranged in the second negative pressure pipe (8), a floating ball is arranged in the liquid discharge one-way valve (7), and the density of the floating ball in the liquid discharge one-way valve (7) is greater than the density of the liquid put into the constant volume chamber.

4. The detergent dispensing device according to claim 1, characterized in that: A second chamber (16) is arranged in the delivery cavity (13), and a water leakage port (17) is arranged at the bottom of the second chamber (16).

5. The detergent dispensing device according to claim 4, characterized in that: The first venturi tube structure (1) is also connected to an overflow box (18). After water enters the first water inlet pipe (21), it flows to the overflow box (18) through the first water outlet (20). An overflow pipe (19) is provided on the overflow box (18). The overflow pipe (19) is provided near the upper part of the overflow box (18) to flow excess water in the overflow box (18) to the washing bucket or the second chamber (16) or the delivery chamber (13).

6. The detergent dispensing device according to claim 5, characterized in that: The water inlet of the overflow pipe (19) on the overflow box (18) is not higher than the first water outlet (20) of the overflow box (18), or the height of the first water outlet (20) on the overflow box (18) is higher than the liquid level of the injected liquid contained in the constant volume chamber (4).

7. The detergent dispensing device according to claim 1, characterized in that: The second water outlet (11) of the second venturi tube structure (10) is connected to the delivery chamber (13) via a long drainage pipe (12).

8. The detergent dispensing device according to claim 1, characterized in that: The invention comprises a drawer box base (29) and a drawer box cover plate (28), wherein a delivery cavity (13) is formed between the drawer box base (29) and the drawer box cover plate (28), a detergent cover plate (27) and a top cover plate (23) are sequentially arranged above the drawer box cover plate (28), and the fixed volume cavity (4) is formed between the top cover plate (23) and the detergent cover plate (27).

9. A washing machine, characterized in that: It comprises the detergent dispensing device as claimed in any one of claims 1 to 8.

Images