One-way valve and washing machine liquid dispensing device including the one-way valve

Abstract

The utility model discloses a one-way valve and a washing machine liquid dispensing device including the one-way valve, comprising a valve body and also comprising: an opening and closing plate, openings at both ends of the valve body are through-set, and the opening and closing plate is used to block the downstream opening of the valve body; a spring, which is located in the valve body; a driving component, and the spring drives the opening and closing plate to move toward the downstream opening of the valve body through the driving component; a sealing component, and a sealing component is arranged between the opening and closing plate and the valve body, and is used to seal between the opening and closing plate and the downstream opening of the valve body. Since the spring is arranged in the valve body and the opening and closing plate blocks the downstream opening of the valve body, washing liquid cannot enter the valve body through the downstream opening of the valve body, while clean water can enter the valve body through the upstream opening of the valve body, so that the spring will only contact with clean water, has a long service life, and prevents the spring from being corroded by detergent.

Description

Technical Field

[0001] The utility model belongs to the technical field of one-way valves, and in particular relates to a one-way valve and a washing machine liquid dispensing device comprising the valve body. Background Art

[0002] A check valve, also known as a non-return valve or a non-return valve, is a valve that allows fluid (liquid or gas) to flow in only one direction to prevent the fluid from flowing back. It is an automatic valve that can operate without manual or external control. Check valves play an important role in various applications, ensuring that the fluid in the system flows in the intended direction and protecting equipment and processes.

[0003] One-way valves are also used in washing machine liquid dispensing devices. Most detergents are highly corrosive, and one-way valves are generally one-way valves with springs. The spring is located downstream of the valve opening and comes into contact with corrosive detergents. The spring is easily corroded by the detergents, resulting in a short spring life and inconvenience. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a one-way valve, including a valve body, characterized in that it also includes:

[0005] An opening and closing plate, the two ends of the valve body are opened through, and the opening and closing plate is used to block the downstream opening of the valve body;

[0006] A spring, located in the valve body;

[0007] A drive assembly, wherein the spring drives the opening and closing plate to move toward the downstream opening of the valve body through the drive assembly;

[0008] A sealing component is provided between the opening and closing plate and the valve body, and is used to seal between the opening and closing plate and the downstream opening of the valve body.

[0009] Furthermore, the driving assembly includes:

[0010] A guide column, one end of which is fixedly connected to the end surface of the opening and closing plate;

[0011] A guide plate, wherein the guide plate is located in the valve body and is fixedly connected to the valve body;

[0012] A blocking plate, the other end of the guide column is fixedly sleeved with a blocking plate;

[0013] The spring is sleeved on the guide column, one end of the spring is arranged to abut against the guide plate, the other end of the spring is arranged to abut against the blocking plate, and the guide column is movably arranged on the guide plate.

[0014] Furthermore, a plurality of gaps are formed between the outer contour of the guide plate and the inner contour of the valve body.

[0015] Furthermore, the sealing assembly comprises:

[0016] The sealing ring is sleeved on the guide column, one side of the sealing ring is fixedly connected to the opening and closing plate, and the other end of the sealing ring is arranged to abut against the end surface of the valve body.

[0017] Furthermore, a second sealing component is also included, wherein the second sealing component includes:

[0018] A placement ring is formed by radially extending in the valve body and is located on a side of the guide plate facing the downstream opening;

[0019] A metal seal for sealing engagement with the opening and closing plates;

[0020] A clamping ring, the downstream opening spiral of the valve body is provided with a clamping ring, the inner ring of the clamping ring radially extends to form a flange, and the flange is used to clamp the sealing metal part;

[0021] Among them, an annular cavity is formed between the placement ring, the clamping ring and the flange, the metal seal is located in the cavity, and the placement ring, the metal seal and the clamping ring are all hollow rings.

[0022] Furthermore, it also includes:

[0023] A blocking block is formed by the opening and closing plate protruding toward one side of the valve body, and is used for sealing engagement with the metal sealing member, wherein the diameter of the blocking block is smaller than the inner ring of the flange;

[0024] Among them, the cross-section of the metal seal is a V-shaped structure with the opening facing the axis, one side line of the V-shaped structure is vertical and fits with the flange and the sealing block, and the other side line of the V-shaped structure is inclined and is set in conflict with the placement ring.

[0025] Furthermore, the inner ring of the placement ring extends toward the clamping ring to form a rib ring.

[0026] Furthermore, the outer ring fixing sleeve of the valve body is provided with a plurality of O-type sealing sleeves.

[0027] Furthermore, a washing machine liquid dispensing device including the one-way valve includes:

[0028] Clean water pipeline, used to transmit clean water;

[0029] A washing liquid pipeline for preparing the liquid;

[0030] Among them, the washing liquid pipeline and the clean water pipeline are arranged in a through-connected manner, and a solenoid valve is fixedly arranged at the junction of the clean water pipeline and the washing liquid pipeline for controlling the opening and closing of the flow of clean water. The washing liquid pipeline has a liquid inlet for introducing washing liquid, and the valve body of the one-way valve is fixedly arranged in the washing liquid pipeline, and the upstream opening of the valve body of the one-way valve is arranged toward the solenoid valve, and the downstream opening of the valve body of the one-way valve is arranged toward the liquid inlet.

[0031] The beneficial effects of the utility model are:

[0032] 1. Since the spring is arranged in the valve body and the opening and closing plate blocks the downstream opening of the valve body, the cleaning liquid cannot enter the valve body through the downstream opening of the valve body, while clean water can enter the valve body through the upstream opening of the valve body, so that the spring will only contact with clean water, which has a long service life and prevents the spring from being corroded by detergent.

[0033] 2. By setting up a driving assembly, the opening and closing plate can be moved conveniently through the cooperation of the spring and the driving assembly, so that the movement trajectory of the opening and closing plate is stable. At the same time, the opening and closing plate can be pressed toward the downstream opening of the valve body through the rebound force of the spring, thereby preventing the cleaning liquid from entering the valve body and causing corrosion to the spring.

[0034] 3. Since a number of gaps are formed between the outer contour of the guide plate and the inner contour of the valve body, the existence of the guide plate will not affect the flow of clean water. The clean water entering the valve body can pass through the gap formed by the guide plate and the valve body to press the opening and closing plate open, which not only does not affect the flow of clean water, but also plays a buffering role, avoiding damage to the opening and closing plate caused by excessive water pressure.

[0035] 4. By setting a sealing ring, after the opening and closing plate is pressed toward the valve body, the opening and closing plate and the valve body can be sealed through the sealing ring, so that the sealing effect is better after the opening and closing plate presses the downstream opening of the valve body to avoid leakage of clean water.

[0036] 5. By setting up a second sealing component, a double sealing effect can be achieved. Since the opening and closing plate is located at the downstream opening of the valve body, the sealing ring sometimes comes into contact with the detergent. If the sealing ring is corroded and the use effect is poor, the metal seal and the opening and closing plate can cooperate to prevent leakage, thereby achieving a better sealing effect.

[0037] 6. The rib ring is set so that the circle formed by the edge line of the other side of the V-shaped structure of the metal seal will radially shrink on the placement ring until it touches the rib ring, which will block the deformation of the other side of the V-shaped structure of the metal seal and prevent the metal seal from excessive bending, affecting the effect and detaching from the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Attached Figure 1 It is a structural diagram of the utility model;

[0039] Attached Figure 2 It is an explosion diagram of the utility model;

[0040] Attached Figure 3 It is a cross-sectional view of the utility model;

[0041] Attached Figure 4 For attachment Figure 3 A is an enlarged schematic diagram;

[0042] Attached Figure 5 It is a cross-sectional right view of the guide plate;

[0043] Attached Figure 6 The structural diagram of the liquid dispensing device for the washing machine;

[0044] Attached Figure 7 For attachment Figure 6 A magnified schematic diagram of B.

[0045] Explanation of the reference numerals in the accompanying drawings: 1. valve body, 2. opening and closing plate, 3. spring, 4. guide column, 5. guide plate, 6. blocking plate, 7. sealing ring, 8. placing ring, 9. metal sealing part, 10. clamping ring, 11. flange, 12. cavity, 13. sealing block, 14. rib ring, 15. sealing sleeve, 16. clean water pipe, 17. washing liquid pipe, 18. solenoid valve, 19. liquid inlet. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application. In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values, and it should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. Example 1

[0047] This embodiment provides a one-way valve, including a valve body 1, and further comprising:

[0048] An opening and closing plate 2 is provided through the openings at both ends of the valve body 1, and the opening and closing plate 2 is used to block the downstream opening of the valve body 1;

[0049] A spring 3 is located in the valve body 1;

[0050] A driving assembly, wherein the spring 3 drives the opening and closing plate 2 to move toward the downstream opening of the valve body 1 through the driving assembly;

[0051] A sealing component is provided between the opening and closing plate 2 and the valve body 1 , and is used to seal between the opening and closing plate 2 and the downstream opening of the valve body 1 .

[0052] In the present technical solution, since an opening and closing plate 2 is provided to block the downstream opening of the valve body 1, and the spring 3 is located in the valve body 1, the opening and closing plate 2 is driven by the driving assembly to block the downstream opening of the valve body 1. In actual use, the washing liquid is located at the downstream opening of the valve body 1, and clean water enters the valve body 1 from the upstream opening of the valve body 1. After the water pressure of the clean water is greater than the elastic force of the spring 3, the clean water entering the valve body 1 can press the opening and closing plate 2 open, thereby flowing out from the downstream opening of the valve body 1 and mixing with the washing liquid. After the clean water has entered, the water pressure of the clean water will be less than the elastic force of the spring 3, and the opening and closing plate 2 can re-seal the downstream opening of the valve body 1 through the rebound force of the spring 3.

[0053] Since the spring 3 is arranged in the valve body 1, and the opening and closing plate 2 blocks the downstream opening of the valve body 1, the cleaning liquid cannot enter the valve body 1 through the downstream opening of the valve body 1, while clean water can enter the valve body 1 through the upstream opening of the valve body 1, so that the spring 3 will only come into contact with clean water, with a long service life, and the spring 3 is prevented from being corroded by detergent. Example 2

[0054] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] Furthermore, the driving assembly includes:

[0056] A guide column 4, one end of which is fixedly connected to the end surface of the opening and closing plate 2;

[0057] A guide plate 5, wherein the guide plate 5 is located inside the valve body 1 and is fixedly connected to the valve body 1;

[0058] A blocking plate 6 is fixedly sleeved on the other end of the guide column 4;

[0059] The spring 3 is sleeved on the guide column 4, one end of the spring 3 is set against the guide plate 5, the other end of the spring 3 is set against the blocking plate 6, and the guide column 4 is movably set on the guide plate 5.

[0060] In the present technical solution, by providing a guide plate 5, the guide column 4 is movably arranged on the guide plate 5, so as to guide the left and right movement of the opening and closing plate 2, so that the movement track of the opening and closing plate 2 is more stable;

[0061] Since the spring 3 is sleeved on the guide column 4, one end of the spring 3 is set against the guide plate 5, and the other end of the spring 3 is set against the blocking plate 6. Since the guide plate 5 is fixedly set in the valve body 1, when clean water enters the valve body 1 and the water pressure is greater than the elastic force of the spring 3, the opening and closing plate 2 is pushed open, so that a gap appears between the opening and closing plate 2 and the downstream opening of the valve body 1, so that the clean water flows out of the downstream opening of the valve body 1 through this gap. After the opening and closing plate 2 is pushed open, the guide column 4 is driven to move, so that the guide column 4 drives the blocking plate 6 to move toward the guide plate 5, so that the spring 3 between the guide plate 5 and the blocking plate 6 is compressed;

[0062] After the clean water has entered, the water pressure of the clean water will be less than the elastic force of the spring 3, so that when the spring 3 is reset due to the rebound force, it will push the blocking plate 6 away from the guide plate 5, so that the blocking plate 6 drives the guide column 4 to move, so that the guide column 4 drives the opening and closing plate 2 to reset toward the downstream opening of the valve body 1, and the opening and closing plate 2 is firmly pressed against the downstream opening of the valve body 1 by the rebound force of the spring 3;

[0063] Through this structural design, by setting up a driving assembly, the opening and closing plate 2 is conveniently moved through the cooperation of the spring 3 and the driving assembly, so that the movement trajectory of the opening and closing plate 2 is stable. At the same time, the opening and closing plate 2 is conveniently pressed toward the downstream opening of the valve body 1 through the rebound force of the spring 3, thereby preventing the cleaning liquid from entering the valve body 1 and causing corrosion to the spring 3. Example 3

[0064] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0065] Furthermore, a plurality of gaps are formed between the outer contour of the guide plate 5 and the inner contour of the valve body 1 .

[0066] In the present technical solution, since a number of gaps are formed between the outer contour of the guide plate 5 and the inner contour of the valve body 1, the existence of the guide plate 5 will not affect the flow of clean water. The clean water entering the valve body 1 can pass through the gap formed by the guide plate 5 and the valve body 1 to press the opening and closing plate 2 open, which not only does not affect the flow of clean water, but also plays a buffering role, thereby preventing the opening and closing plate 2 from being damaged by excessive water pressure. Example 4

[0067] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0068] Furthermore, the sealing assembly comprises:

[0069] The sealing ring 7 is sleeved on the guide column 4 , one side of the sealing ring 7 is fixedly connected to the opening and closing plate 2 , and the other end of the sealing ring 7 is disposed in contact with the end surface of the valve body 1 .

[0070] In the present technical solution, a sealing ring 7 is provided so that after the opening and closing plate 2 is pressed toward the valve body 1, the opening and closing plate 2 and the valve body 1 can be sealed by the sealing ring 7, so that the sealing effect is better after the opening and closing plate 2 presses the downstream opening of the valve body 1, thereby avoiding leakage of clean water.

[0071] Through this structural design, Example 5

[0072] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0073] Furthermore, a second sealing component is also included, wherein the second sealing component includes:

[0074] A placement ring 8 is formed by radially extending inside the valve body 1, and the placement ring 8 is located on a side of the guide plate 5 facing the downstream opening;

[0075] A metal seal 9, used for sealing and engaging with the opening and closing plate 2;

[0076] A clamping ring 10, the downstream opening of the valve body 1 is spirally provided with a clamping ring 10, the inner ring of the clamping ring 10 radially extends to form a flange 11, and the flange 11 is used to clamp the sealing metal part;

[0077] An annular cavity 12 is formed between the placement ring 8, the clamping ring 10 and the flange 11, and the metal seal 9 is located in the cavity 12. The placement ring 8, the metal seal 9 and the clamping ring 10 are all hollow rings.

[0078] In the present technical solution, by providing a second sealing assembly, in actual use, when the opening and closing plate 2 is pressed against the downstream opening of the valve body 1, the sealing ring 7 will contact the end face of the pressing ring 10, and the opening and closing plate 2 will contact the metal sealing member 9. The metal sealing member 9 is an elastic member and can play a double sealing role. In addition, since the opening and closing plate 2 is located at the downstream opening of the valve body 1, the sealing ring 7 may sometimes contact the detergent. If the sealing ring 7 is corroded and the use effect is poor, the metal sealing member 9 can cooperate with the opening and closing plate 2 to prevent leakage, so that the sealing effect is better.

[0079] At the same time, the clamping ring 10 and the valve body 1 are detachably connected by threads, which is convenient for the inspection and replacement of the metal seal 9. Since the inner ring of the clamping ring 10 is radially extended to form a flange 11, it is convenient to press the metal seal 9 to prevent the metal seal ring from shaking left and right under normal conditions. When in use, a sealing gasket is arranged between the clamping ring 10 and the valve body 1 to ensure the sealing effect between the clamping ring 10 and the valve body 1, and the placement ring 8, metal seal 9 and clamping ring 10 are all hollow rings, which will not affect the water flow while ensuring the sealing effect.

[0080] Through this structural design, by setting up a second sealing component, a double sealing effect can be achieved. Since the opening and closing plate 2 is located at the downstream opening of the valve body 1, the sealing ring 7 sometimes comes into contact with the detergent. If the sealing ring 7 is corroded and the use effect is poor, the metal sealing part 9 can cooperate with the opening and closing plate 2 to prevent leakage, thereby achieving a better sealing effect. Example 6

[0081] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0082] Furthermore, it also includes:

[0083] A blocking block 13 is formed on the opening and closing plate 2 protruding toward one side of the valve body 1 and is used for sealing with the metal seal 9. The diameter of the blocking block 13 is smaller than the inner circle of the flange 11;

[0084] The cross section of the metal seal 9 is a V-shaped structure with its opening facing the axis, one side of the V-shaped structure is vertical and fits the flange 11 and the sealing block 13 , and the other side of the V-shaped structure is inclined and is in conflict with the placement ring 8 .

[0085] In the present technical solution, in actual use, the diameter of the blocking block 13 is smaller than the inner circle of the flange 11 and larger than the inner circle of the metal seal 9, which ensures that when the opening and closing plate 2 drives the blocking block 13 to move, it can block the metal seal 9 without interfering with the flange 11;

[0086] Since one side line of the V-shaped structure of the metal seal 9 is in a vertical state and fits with the flange 11 and the blocking block 13, and fits with the flange 11, it is used to position the metal seal 9, so that when the flange 11 presses the metal seal 9, the positioning can be guaranteed, and the fit with the blocking block 13 makes the sealing effect better;

[0087] When the opening and closing plate 2 has a force toward the downstream opening of the valve body 1 through the rebound force of the spring 3, it will drive the blocking block 13 to move toward the hollow inner diameter of the metal seal 9. After the blocking block 13 is fitted with the metal seal 9, the metal seal 9 will be slightly deformed due to the elastic force of the spring 3. The metal seal 9 has elastic force, so that the blocking block 13 is tightly fitted with the metal seal 9 due to the elastic force of the metal seal 9 and the elastic force of the spring 3.

[0088] Since the cross section of the metal seal 9 presents a V-shaped structure, and the other side line of the V-shaped structure is inclined and is set against the placement ring 8, the metal seal 9 is engaged with the blocking block 13, and when the metal seal 9 is deformed, the other side of the V-shaped structure will also be in contact with the placement ring 8 and move and deform along the placement ring 8, so that the circle formed by the side line of the other side of the V-shaped structure of the metal seal 9 will shrink radially on the placement ring 8, so that the two sides of the V-shaped structure are tightly fitted with the blocking block 13 and the placement ring 8 respectively, so that the sealing effect is better;

[0089] At the same time, the other side of the V-shaped structure of the metal seal 9 can also have a rounded corner to reduce the friction between the metal seal 9 and the placement ring 8 and avoid wear. Example 7

[0090] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0091] Furthermore, the inner ring of the placement ring 8 extends toward the clamping ring 10 to form a rib ring 14 .

[0092] In the present technical solution, when the metal seal 9 is engaged with the blocking block 13 and the blocking block 13 drives the metal seal 9 to deform by the pressure brought by the spring 3, the other side of the V-shaped structure will also come into contact with the placement ring 8 and move and deform along the placement ring 8, so that the circle formed by the edge line of the other side of the V-shaped structure of the metal seal 9 will radially shrink on the placement ring 8;

[0093] The setting of the rib ring 14 ensures that the circle formed by the edge line of the other side of the V-shaped structure of the metal seal 9 will radially shrink on the placement ring 8 until it touches the rib ring 14, which will block the deformation of the other side of the V-shaped structure of the metal seal 9 and prevent the metal seal 9 from excessively bending to affect the effect and detaching from the cavity 12. Example 8

[0094] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0095] Furthermore, the outer ring fixing sleeve of the valve body 1 is provided with a plurality of O-shaped sealing sleeves 15 .

[0096] In the present technical solution, a number of O-shaped sealing sleeves 15 are fixedly sleeved on the outer ring of the valve body 1. When the valve body 1 needs to be installed into the pipeline, the valve body 1 can be directly inserted into the pipeline through a tool. At this time, the sealing sleeve 15 will have an interference fit with the inner wall of the pipeline, fixing the valve body 1 in the pipeline, and also increasing the friction between the valve body 1 and the pipeline. Example 9

[0097] This embodiment provides a one-way valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0098] A washing machine liquid dispensing device including the above-mentioned one-way valve comprises:

[0099] A clean water pipeline 16, used for transmitting clean water;

[0100] A washing liquid pipeline 17 is used for liquid preparation;

[0101] Among them, the washing liquid pipeline 17 is arranged through the clean water pipeline 16, and a solenoid valve 18 is fixedly arranged at the junction of the clean water pipeline 16 and the washing liquid pipeline 17 for controlling the opening and closing of the clean water flow. The washing liquid pipeline 17 has a liquid inlet 19 for introducing washing liquid, and the valve body 1 of the one-way valve is fixedly arranged in the washing liquid pipeline 17, and the upstream opening of the valve body 1 of the one-way valve is arranged toward the solenoid valve 18, and the downstream opening of the valve body 1 of the one-way valve is arranged toward the liquid inlet 19.

[0102] In the present technical scheme, the working principle of the liquid dispensing device of the washing machine is as follows: the water inlet pipe is connected to the clean water pipe 16 for supplying clean water, the washing liquid transmission pipe is connected to the liquid inlet 19 for supplying washing liquid, the washing liquid enters the washing liquid pipe 17 through the liquid inlet 19, and then the solenoid valve 18 at the junction of the clean water pipe 16 and the washing liquid pipe 17 is opened, so that the clean water moves toward the valve body 1 of the one-way valve through the solenoid valve 18, and when the clean water passes through the valve body 1 of the one-way valve and flows out from the downstream opening of the one-way valve, it will mix with the washing liquid, and then the washing liquid will be flushed into the washing machine, and then the washing liquid inlet 19 stops feeding, and at this time the washing liquid stops entering the washing liquid pipe 17, but the solenoid valve 18 for controlling the clean water continues to remain in an open state, so that the clean water flushes the washing liquid pipe 17 to avoid residual washing liquid in the washing liquid pipe 17, which, on the one hand, prevents the residual washing liquid from causing inaccurate proportioning, and on the other hand, prevents the washing liquid from flowing back and corroding the one-way valve.

[0103] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the specification of the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A one-way valve, comprising a valve body (1), characterized in that: Also includes: An opening and closing plate (2), the openings at both ends of the valve body (1) being arranged to pass through, and the opening and closing plate (2) being used to block the downstream opening of the valve body (1); A spring (3) is located in the valve body (1); A drive assembly, wherein the spring (3) drives the opening and closing plate (2) to move toward the downstream opening of the valve body (1) through the drive assembly; A sealing component is provided between the opening and closing plate (2) and the valve body (1), and is used to seal between the opening and closing plate (2) and the downstream opening of the valve body (1).

2. A one-way valve according to claim 1, characterized in that: The drive assembly comprises: A guide column (4), one end of which is fixedly connected to the end surface of the opening and closing plate (2); A guide plate (5), the guide plate (5) being located inside the valve body (1) and fixedly connected to the valve body (1); A blocking plate (6), wherein the other end of the guide column (4) is fixedly sleeved with a blocking plate (6); The spring (3) is sleeved on the guide column (4), one end of the spring (3) is arranged to abut against the guide plate (5), the other end of the spring (3) is arranged to abut against the blocking plate (6), and the guide column (4) is movably arranged on the guide plate (5) left and right.

3. A one-way valve according to claim 2, characterized in that: A plurality of gaps are formed between the outer contour of the guide plate (5) and the inner contour of the valve body (1).

4. A one-way valve according to claim 2, characterized in that: The sealing assembly comprises: A sealing ring (7), wherein the sealing ring (7) is sleeved on the guide column (4), one side of the sealing ring (7) is fixedly connected to the opening and closing plate (2), and the other end of the sealing ring (7) is arranged to abut against the end surface of the valve body (1).

5. A one-way valve according to claim 4, characterized in that: Also included is a second sealing assembly, the second sealing assembly comprising: A placement ring (8), the valve body (1) radially extending therein to form a placement ring (8), the placement ring (8) being located on a side of the guide plate (5) facing the downstream opening; A metal sealing member (9) for sealingly engaging with the opening and closing plate (2); A clamping ring (10), wherein the downstream opening of the valve body (1) is spirally provided with a clamping ring (10), and the inner ring of the clamping ring (10) is radially extended to form a flange (11), and the flange (11) is used to clamp the sealing metal part; An annular cavity (12) is formed between the placement ring (8), the clamping ring (10) and the flange (11), the metal seal (9) is located in the cavity (12), and the placement ring (8), the metal seal (9) and the clamping ring (10) are all hollow rings.

6. A one-way valve according to claim 5, characterized in that: Also includes: A sealing block (13), the opening and closing plate (2) protruding toward one side of the valve body (1) forms a sealing block (13), which is used for sealingly engaging with the metal sealing member (9), and the diameter of the sealing block (13) is smaller than the inner ring of the flange (11); The cross section of the metal seal (9) is a V-shaped structure with its opening facing the axis, one side of the V-shaped structure is vertical and fits the flange (11) and the sealing block (13), and the other side of the V-shaped structure is inclined and is disposed in contact with the placement ring (8).

7. A one-way valve according to claim 6, characterized in that: The inner ring of the placement ring (8) extends toward the clamping ring (10) to form a rib ring (14).

8. A one-way valve according to claim 7, characterized in that: The outer ring fixing sleeve of the valve body (1) is provided with a plurality of O-shaped sealing sleeves (15).

9. A liquid dispensing device for a washing machine, characterized in that: The washing machine liquid dispensing device comprises the one-way valve according to any one of claims 1 to 8, and further comprises: A clean water pipeline (16) for transmitting clean water; A washing liquid pipeline (17) for preparing the liquid; The washing liquid pipeline (17) is interlinked with the clean water pipeline (16); a solenoid valve (18) is fixedly arranged at the junction of the clean water pipeline (16) and the washing liquid pipeline (17) for controlling the opening and closing of the clean water flow; the washing liquid pipeline (17) has a liquid inlet (19) for introducing washing liquid; the valve body (1) of the one-way valve is fixedly arranged in the washing liquid pipeline (17); the upstream opening of the valve body (1) of the one-way valve is arranged toward the solenoid valve (18); and the downstream opening of the valve body (1) of the one-way valve is arranged toward the liquid inlet (19).

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