A backflow prevention assembly for a drain valve

Abstract

A backflow prevention assembly of a drain valve, the drain assembly comprising a sleeve and a stopper assembly connected to each other, the sleeve being provided with a radially slidable elastic limiting device, the sleeve being provided with an axially slidable counterweight assembly, the counterweight assembly being provided with a groove for clamping the elastic limiting device; in a non-drainage condition, one end of the elastic limiting device abuts against the lower end surface of the bottom plate, so that the stopper assembly cannot move upward at the position of closing the drain port, and even if the sewage below the drain port flows upward to exert an upward thrust on the drain assembly, the drain assembly cannot be opened, thereby forming a backflow prevention effect; in a drainage condition, during the upward movement of the counterweight assembly, the other end of the elastic limiting device is inserted into the groove, so that one end of the elastic limiting device is separated from the bottom plate, and the stopper assembly is driven to open the drain port by the sleeve. The elastic limiting device is integrated on the drain assembly, without the need to change other parts of the drain valve, and the product optimization cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drain valve technology, in particular to a drain valve backflow prevention assembly. BACKGROUND

[0002] At present, the toilet generally opens the drain valve to open the drainage, so that the water in the water tank is discharged through the drain port of the drain valve to the toilet, so as to flush the sewage in the toilet into the sewage pipeline. For the purpose of beauty and space saving, most of the toilet water tanks are low. If the sewage pipeline is blocked during use, the sewage in the toilet will open the drain valve stop water assembly, so that the sewage flows back to the water tank, causing water pollution in the water tank.

[0003] The prior art proposes related technical solutions, such as Chinese patent CN110656683A proposes a drain valve structure for preventing backflow, but this structure can only use a pull rope to drain water, and can only drain water in a single row. In other embodiments, the swing arm presses the drain assembly to achieve self-locking to prevent backflow. The swing arm and the key need a small gap, otherwise the self-locking will fail. The small gap makes the drain assembly prone to have a small sealing amount, which poses a risk of water leakage. For example, Chinese patent CN109537693A proposes a hydraulic drive mechanism for a toilet drain valve. This structure directly presses the drain assembly with a hydraulic cylinder spring to prevent backflow, and the backflow prevention effect depends on the size of the spring force. For example, CN212375965U proposes a drain valve with a backflow prevention structure. The backflow prevention structure of the drain valve is arranged at the bottom drain hole, which occupies the drain space and blocks the drain flow rate, affecting the drainage. SUMMARY

[0004] In view of the deficiencies in the background art, the purpose of the present application is to provide a drain valve backflow prevention assembly.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A backflow prevention assembly for a drain valve includes a base, a base plate, and a drain assembly. The base has a drain outlet, and the drain assembly is slidably installed between the base and the base plate, forming a sealing fit with the drain outlet. The drain assembly comprises a sleeve and a water-stop assembly connected to each other. The sleeve passes through the base plate, and the water-stop assembly is located between the base and the base plate. The sleeve has a radially sliding elastic limiting device, and the sleeve contains an axially sliding counterweight assembly. The counterweight assembly has a groove for engaging the elastic limiting device. In the non-draining state, one end of the elastic limiting device abuts against the lower end face of the base plate, preventing the water-stop assembly from moving upwards when the drain outlet is closed. In the draining state, as the counterweight assembly moves upwards, the other end of the elastic limiting device inserts into the groove, causing one end of the elastic limiting device to disengage from the base plate, and the sleeve drives the water-stop assembly to open the drain outlet.

[0007] Furthermore, the elastic limiting device includes a positioning pin, a spring, and a fixing cover. Under the action of the spring, the other end of the positioning pin always abuts against the counterweight assembly and is used to insert into the groove. One end of the positioning pin passes through the fixing cover and is used to abut against the lower end face of the base plate.

[0008] Furthermore, the surface of the groove is a smooth inclined surface, one end of the positioning pin is a cylindrical surface, and the other end is an inclined surface that mates with the smooth inclined surface.

[0009] Furthermore, the counterweight assembly has a first end face and a second end face, and the sleeve has a limiting protrusion, which has a limiting upper end face and a limiting lower end face; when the first end face abuts against the limiting upper end face, one end of the elastic limiting device abuts against the lower end face of the base plate; when the second end face abuts against the limiting lower end face, the other end of the elastic limiting device is inserted into the groove and one end of it is disengaged from the lower end face of the base plate.

[0010] Furthermore, the counterweight assembly includes a guide member and a counterweight block connected to each other. The guide member includes a first guide section with a larger diameter and a second guide section with a smaller diameter. The end of the first guide section connected to the second guide section is the first end face. The second guide section is provided with the groove and connected to the counterweight block. The upper surface of the counterweight block is the second end face. The second guide section is inserted into the through hole surrounded by the limiting protrusion.

[0011] Furthermore, the limiting protrusion has a mounting hole in the radial direction of the sleeve for placing the elastic limiting device.

[0012] Furthermore, the sleeve is provided with a buckle hole, the water-stopping component is provided with an elastic buckle, and the end of the elastic buckle is provided with an outward barb. The elastic buckle is inserted into the sleeve and the barb is engaged with the plane of the buckle hole near one end of the water-stopping component.

[0013] Furthermore, the water-stopping component is provided with a sealing ring for forming a sealing fit with the drain outlet.

[0014] Furthermore, the base plate and the base are connected by a snap-fit ​​connection.

[0015] Furthermore, the counterweight assembly can be driven by a pull rope or a button.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention proposes an anti-backflow component for a drain valve. In its initial state, the elastic limiting device abuts against the base plate, preventing the drain assembly from moving upwards. Even if sewage flowing back up from below the drain outlet exerts an upward thrust on the drain assembly, it cannot open the drain assembly, thus creating an anti-backflow effect. When drainage is required, the counterweight component moves upwards, causing the other end of the elastic limiting device to insert into the groove, disengaging one end from the lower end face of the base plate. This releases the limiting effect between the water-stop component and the base plate, and the sleeve drives the water-stop component to open the drain outlet. This elastic limiting device is integrated into the drain assembly, featuring a simple structure and high reliability. It only requires updating and replacing the existing drain assembly in the drain valve, without changing the existing pressing / pulling rope drainage method, or altering other components of the drain valve. It does not affect the drainage rate of the drain valve, resulting in low product optimization costs and wide applicability.

[0018] 2. The present invention proposes a backflow prevention component for a drain valve, wherein the surface of the groove is a smooth inclined surface with a guiding function, and one end of the positioning pin is an inclined surface that cooperates with the smooth inclined surface, which facilitates the insertion and release of the positioning pin, reduces the force required for unlocking, and improves the operating feel.

[0019] 3. The present invention proposes a backflow prevention component for a drain valve. The first end face of the counterweight component abuts against the upper end face of the step limiter. The counterweight component further presses the water-stop component against the drain outlet, increasing the sealing between the water-stop component and the drain outlet and preventing water leakage from the water tank. At the same time, the vertical downward force of the counterweight component effectively resists the force of sewage backflow that pushes open the water-stop component. The second end face of the counterweight component abuts against the lower end face of the step limiter. On the one hand, this prevents the counterweight component from continuing to move upward and squeezing the elastic limiter out of the mounting hole, causing its other end to contact the base plate and thus affecting the feel. On the other hand, it can drive the sleeve to move the water-stop component upward. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an exploded view of a backflow prevention assembly for a drain valve according to the present invention;

[0022] Figure 2 This is an isometric view of the initial state of a backflow prevention assembly for a drain valve according to the present invention.

[0023] Figure 3 This is a cross-sectional view of the initial state of a drain valve anti-backflow assembly according to the present invention;

[0024] Figure 4 This is an exploded view of the drainage component of a backflow prevention assembly for a drainage valve according to the present invention.

[0025] Figure 5 This is a cross-sectional view of the drainage component of a backflow prevention assembly for a drain valve according to the present invention.

[0026] Figure 6 for Figure 3 A magnified view of a section at point A;

[0027] Figure 7 This is a schematic diagram of the upward movement of the drive counterweight component of the anti-backflow component for a drain valve according to the present invention;

[0028] Figure 8 for Figure 7 A magnified view of a section at point A;

[0029] Figure 9 This is a schematic diagram of the second end face of a drain valve anti-backflow assembly abutting the lower end face of a limiting device according to the present invention;

[0030] Figure 10 This is a schematic diagram of the water-stopping component of a backflow prevention assembly for a drain valve according to the present invention, moved to its limit position.

[0031] Figure 11 This is a schematic diagram of the water-stopping component of an anti-backflow component for a drain valve according to the present invention falling.

[0032] Figure 12 This is a schematic diagram of the water-stopping component of a backflow prevention assembly for a drain valve according to the present invention, shown in the diagram below the limit position.

[0033] Figure 13 This is a schematic diagram of the first end face of a drain valve anti-backflow assembly abutting against the upper end face of a limiting device according to the present invention;

[0034] In the diagram, 10 is the base plate; 20 is the base; 30 is the drainage component; 301 is the guide component; 3011 is the first guide section; 3012 is the second guide section; 3013 is the groove; 3014 is the first end face; 302 is the sleeve; 3021 is the upper limit end face; 3022 is the lower limit end face; 3023 is the buckle hole; 3024 is the mounting hole; 3025 is the through hole; 303 is the counterweight; 3031 is the second end face; 401 is the fixing cover; 402 is the spring; 403 is the positioning pin; 50 is the water-stopping component; 501 is the elastic buckle; 5011 is the barb; and 502 is the sealing ring. Detailed Implementation

[0035] The following is combined Figures 1-13 The present invention will be described in detail below.

[0036] A backflow prevention assembly for a drain valve includes a base 20, a base plate 10, and a drain assembly 30. The base 20 has a drain outlet. The drain assembly 30 is slidably installed between the base 20 and the base plate 10 and can form a sealing fit with the drain outlet. The drain assembly 30 includes a sleeve 302 and a water-stopping assembly 50 connected to each other. The sleeve 302 passes through the base plate 10, and the water-stopping assembly 50 is located between the base 20 and the base plate 10. The sleeve 302 has a radially sliding elastic limiting device, and the sleeve 302 has an axially sliding counterweight assembly. The counterweight assembly has a groove 3013 for engaging the elastic limiting device. In the non-draining condition, one end of the elastic limiting device abuts against the lower end face of the base plate 10, preventing the water-stopping assembly 50 from moving upward when the drain outlet is closed. In the draining condition, during the upward movement of the counterweight assembly, the other end of the elastic limiting device inserts into the groove 3013, causing one end of the elastic limiting device to detach from the base plate 10, and the sleeve 302 drives the water-stopping assembly 50 to open the drain outlet.

[0037] This invention proposes an anti-backflow component for a drain valve. In its initial state, the elastic limiting device abuts against the base plate 10, preventing the drain assembly 30 from moving upwards. Even if sewage below the drain outlet flows back upwards and exerts an upward thrust on the drain assembly 30, it cannot open, thus preventing backflow. When drainage is needed, the counterweight component moves upwards, causing the other end of the elastic limiting device to insert into the groove 3013, disengaging one end from the base plate 10. The sleeve 302 then drives the water-stopping component 50 to open the drain outlet. This elastic limiting device is integrated into the drain assembly 30, resulting in a simple structure. Only the drain assembly 30 in existing drain valves needs to be updated or replaced, without changing the existing press / pull rope drainage method or other components of the drain valve. This allows for rapid product optimization and iteration, low cost, and wide applicability.

[0038] In this embodiment, the elastic limiting device includes a positioning pin 403, a spring 402, and a fixing cover 401. Under the action of the spring 402, the other end of the positioning pin 403 is always in contact with the surface of the counterweight assembly and is used for insertion into the groove 3013. One end of the positioning pin 403 passes through the fixing cover 401 and is used to abut against the base plate 10. The elastic limiting device is placed in the mounting hole 3024 provided radially towards the sleeve 302. Furthermore, the surface of the groove 3013 is a smooth inclined surface, one end of the positioning pin 403 is an inclined surface that cooperates with the smooth inclined surface, and the other end is a cylindrical surface. The cooperation between the smooth inclined surface and the inclined surface facilitates the insertion and disengagement of the positioning pin 403 from the groove 3013, reduces the force required for unlocking, and improves the operating feel. Furthermore, the grooves 3013 are arranged symmetrically. In other embodiments, the groove 3013 is an annular groove, the surface of the annular groove is an arc-shaped surface or a slope, and one end of the positioning pin 403 is an arc-shaped end face or a slope that mates with the arc-shaped surface or slope.

[0039] In this embodiment, the counterweight assembly has a first end face 3014 and a second end face 3031. A limiting protrusion is provided inside the sleeve 302, with a limiting upper end face 3021 and a limiting lower end face 3022. When the first end face 3014 abuts against the limiting upper end face 3021, one end of the elastic limiting device abuts against the lower end face of the base plate 10. When the second end face 3031 abuts against the limiting lower end face 3022, the other end of the elastic limiting device is inserted into the groove 3013 and one end is detached from the base plate 10. Further, the counterweight assembly can be driven by a pull rope or a button, and includes a guide member 301 and a counterweight block 303 connected to each other. The groove 3013 and the first end face 3014 are located on the guide member 301, and the second end face 3031 is located on the counterweight block 303.

[0040] In this embodiment, the guide member 301 is in the shape of a stepped shaft, with the larger diameter end being the first guide segment 3011 and the smaller diameter end being the second guide segment 3012. The end where the first guide segment 3011 and the second guide segment 3012 are connected is the first end face 3014. The second guide segment 3012 is provided with a groove 3013 and is connected to a counterweight 303. The upper surface of the counterweight 303 is the second end face 3031. The second guide segment 3012 is inserted into the through hole 3025 surrounded by the limiting protrusion.

[0041] In this embodiment, the first end face 3014 of the counterweight component abuts against the upper end face 3021 of the limiting component, and the counterweight component further presses the water-stop component 50 against the drain outlet, increasing the sealing between the water-stop component 50 and the drain outlet and preventing water leakage from the water tank; at the same time, the vertical downward force of the counterweight component effectively resists the force of sewage backflow pushing open the water-stop component 50; the second end face 3031 of the counterweight component abuts against the lower end face 3022 of the limiting component, on the one hand, preventing the counterweight component from continuing to move upward and squeezing the elastic limiting device out of the groove 3013 and then extending out of the mounting hole 3024, so that one end of it contacts the base plate 10 and affects the feel, on the other hand, it can drive the sleeve 302 to move the water-stop component 50 upward.

[0042] In this embodiment, the sleeve 302 is provided with a buckle hole 3023, and the water-stopping component 50 is provided with an elastic buckle 501. The end of the elastic buckle 501 is provided with an outward barb 5011. The elastic buckle 501 is inserted into the sleeve 302 and the barb 5011 is engaged with the plane of the buckle hole 3023 near the end of the water-stopping component 50.

[0043] In this embodiment, the water-stopping component 50 is provided with a sealing ring 502 for forming a sealing fit with the drain outlet; the base plate 10 and the base 20 are connected by a snap-fit ​​connection.

[0044] In this embodiment, the present invention proposes a backflow prevention component for a drain valve, the working principle of which is as follows:

[0045] In the initial state, i.e., before drainage, such as Figure 3 , Figure 6 As shown, the counterweight component, by its own weight, causes the first end face 3014 to abut against the upper end face of the limiting step inside the sleeve 302, pressing the water-stop component 50 onto the drain outlet to form a seal. At this time, the positioning pin 403 is not inserted into the groove 3013 and the mounting hole 3024 is located below the base plate 10. Therefore, one end of the positioning pin 403 extends out of the fixing cover 401 and abuts against the lower end face of the base plate 10, so that the water-stop component 50 cannot move upward in the position where it is closed to the drain outlet, that is, in the position where it forms a seal with the drain outlet, thereby forming an anti-backflow function.

[0046] When drainage is needed, the drive counterweight assembly moves upward, such as... Figures 7-9 As shown. When the second end face 3031 of the counterweight assembly abuts against the lower end face 3022 of the limiting position, the groove 3013 is aligned with the mounting hole 3024. Under the action of the spring 402, the other end of the positioning pin 403 is inserted into the groove 3013, causing one end of it to disengage from the lower end face of the base plate 10, thereby releasing the limiting position between the drainage assembly 30 and the base plate 10, as shown. Figure 9 As shown. Continue driving the counterweight assembly, thereby causing the drainage assembly 30 to continue moving upwards until the water-stopping assembly 50 abuts against the lower end face of the base plate 10. The drainage assembly 30 then stops rising, achieving drainage. Figure 10 As shown.

[0047] After drainage is complete, the drainage component 30 descends until it presses against the drain outlet and forms a seal. At this point, the mounting hole 3024 is below the base plate 10. Figure 12 As shown. The counterweight component continues to move downwards under its own weight, thereby squeezing the positioning pin 403 out of the groove 3013, causing one end of the positioning pin 403 to extend out of the fixing cover 401 and abut against the lower end face of the base plate 10, thus restoring the limiting position between the drainage component 30 and the base plate 10, and returning to the initial state, as shown. Figure 13 As shown.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A backflow prevention assembly for a drain valve, comprising a base, a bottom plate, and a drain assembly, wherein the base is provided with a drain outlet, and the drain assembly is slidably installed between the base and the bottom plate, and forms a sealing fit with the drain outlet, characterized in that, The drainage assembly includes a sleeve and a water-stop assembly connected to each other. The sleeve passes through the base plate, and the water-stop assembly is located between the base and the base plate. The sleeve has a radially sliding elastic limiting device, and the sleeve has an axially sliding counterweight assembly. The counterweight assembly has a groove for engaging the elastic limiting device. In the non-draining condition, one end of the elastic limiting device abuts against the lower end face of the base plate, preventing the water-stop assembly from moving upward when the drain outlet is closed. In the drainage condition, as the counterweight assembly is driven upward, the other end of the elastic limiting device inserts into the groove, causing one end of the elastic limiting device to disengage from the base plate, and the sleeve drives the water-stop assembly to open the drain outlet. The elastic limiting device includes a positioning pin, a spring, and a fixing cover. Under the action of the spring, the other end of the positioning pin is always in contact with the counterweight assembly and is used to insert into the groove. One end of the positioning pin passes through the fixing cover and is used to abut against the lower end face of the base plate.

2. The anti-backflow assembly for a drain valve as described in claim 1, characterized in that, The surface of the groove is a smooth inclined surface, one end of the positioning pin is a cylindrical surface, and the other end is an inclined surface that mates with the smooth inclined surface.

3. The anti-backflow assembly for a drain valve as described in claim 1, characterized in that, The counterweight assembly has a first end face and a second end face. The sleeve has a limiting protrusion with a limiting upper end face and a limiting lower end face. When the first end face abuts against the limiting upper end face, one end of the elastic limiting device abuts against the lower end face of the base plate. When the second end face abuts against the limiting lower end face, the other end of the elastic limiting device is inserted into the groove and one end of it is disengaged from the lower end face of the base plate.

4. The anti-backflow assembly for a drain valve as described in claim 3, characterized in that, The counterweight assembly includes a guide member and a counterweight block connected to each other. The guide member includes a first guide section with a larger diameter and a second guide section with a smaller diameter. The end of the first guide section connected to the second guide section is the first end face. The second guide section is provided with the groove and connected to the counterweight block. The upper surface of the counterweight block is the second end face. The second guide section is inserted into the through hole surrounded by the limiting protrusion.

5. The anti-backflow assembly for a drain valve as described in claim 3, characterized in that, The limiting protrusion has a mounting hole in the radial direction of the sleeve for placing the elastic limiting device.

6. The anti-backflow assembly for a drain valve as described in claim 1, characterized in that, The sleeve is provided with a buckle hole, and the water-stopping component is provided with an elastic buckle. The end of the elastic buckle is provided with an outward barb. The elastic buckle is inserted into the sleeve and the barb is engaged with the plane of the buckle hole near the end of the water-stopping component.

7. The anti-backflow assembly for a drain valve as described in claim 1, characterized in that, The water-stopping component is equipped with a sealing ring for forming a sealing fit with the drain outlet.

8. The anti-backflow assembly for a drain valve as described in claim 1, characterized in that, The base plate and the base are connected by a snap-fit ​​mechanism.

9. A backflow prevention assembly for a drain valve as described in claim 1, characterized in that, The counterweight assembly is driven by a pull rope or a button.

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