Float-type blow-off check valve

Abstract

The present application provides a kind of float type sewage check valve, including valve shell and float, valve shell has shell content container cavity, shell content container cavity has flow inlet and discharge outlet, flow inlet and discharge outlet are arranged oppositely, float has the sealing state of blocking flow inlet and the avoidance state of being in the radial peripheral region of the drainage passage formed between flow inlet and discharge outlet, the cavity bottom wall of shell content container cavity has guide structure, guide structure has float guide sliding track, float guide sliding track is increasingly lower from inside to outside along the radial of discharge outlet, to guide it to radial peripheral region in the process of switching from sealing state to avoidance state.The present application can effectively avoid the adverse occupation of float to drainage passage, ensure the smoothness of drainage, avoid direct impact contact of sewage to float, avoid drainage blockage phenomenon occurs, greatly reduce the damage degree of flow inlet sealing property due to the adhesion of dirt on the outer surface of float.

Description

Technical Field

[0001] This invention belongs to the field of one-way valve design technology, specifically relating to a float-type drain check valve. Background Technology

[0002] With the technological advancements in the automotive industry, the requirements for vehicle body drainage and backflow prevention functions are becoming increasingly stringent. In related technologies, the vehicle drainage check valve employs either a float-type water-stop structure or a traditional single check valve structure. For the float-type water-stop structure, the float is typically placed directly on the main drainage channel. During normal vehicle drainage, the float remains at the outlet position for an extended period, easily obstructing the flow cross-section and causing a decrease in drainage volume. The continuous contact and scouring of the float by the drainage allows impurities such as mud, feathers, and leaves to easily adhere to its surface, leading to pipe blockage. Furthermore, when the float is in a blocked position, there is a risk of incomplete sealing and failure of the water-stop protection (backflow prevention). Summary of the Invention

[0003] Therefore, the present invention provides a float-type sewage check valve, which can overcome the shortcomings of related float-type sewage check valves, such as the float being in the outlet position for a long time, obstructing the flow section and reducing the drainage volume, the float surface being prone to adhering to impurities and causing pipeline blockage, and the float not sealing properly and failing to stop water flow.

[0004] To address the aforementioned problems, this invention provides a float-type sewage check valve, comprising a valve housing and a float. The valve housing has an internal cavity, within which the float is located. The internal cavity has an inlet and an outlet. With reference to the valve's orientation in its operational state, the inlet and outlet are vertically opposite each other. The float has a sealing state that blocks the inlet and a clearance state that is located in the radially peripheral region of the drainage channel formed between the inlet and outlet. The bottom wall of the internal cavity has a guiding structure with a float-guided sliding track. This track descends radially from the inside out along the outlet to guide the float to the radially peripheral region during the transition from the sealing state to the clearance state. Furthermore, the float can switch from the clearance state to the sealing state under buoyancy and back to the clearance state after the buoyancy is eliminated.

[0005] In some embodiments, the guiding structure includes two spaced-apart guide plates that protrude toward the side closest to the inlet, with the middle being higher than the sides, and the top surface of the guide plates forming the float guiding sliding track.

[0006] In some embodiments, a float limiting ring is provided on the bottom wall of the cavity of the shell. The float limiting ring surrounds the outlet. When the float is in the avoidance state, the radial outer ring wall of the float limiting ring abuts against the outer surface of the float near the outlet at a first point to achieve radial limiting of the float.

[0007] In some embodiments, the minimum radial distance between the first point and the inlet is fa, the farthest radial distance between the first point and the outer surface of the float in the avoidance state near the outlet is fb, fa > fb; and / or, the float limiting ring has a first flow channel connecting its radial inner and outer sides.

[0008] In some embodiments, a limiting structure is also provided on the bottom wall of the cavity of the shell. The limiting structure includes two limiting plates arranged in parallel and spaced apart, forming a buoyancy guide channel between the two limiting plates. The guide structure and the float are both located in the buoyancy guide channel.

[0009] In some embodiments, the inlet and the outlet are coaxially arranged, the diameter d of the inlet is smaller than the diameter D of the outlet, and / or the diameter d of the inlet is smaller than the distance L between the two guide pieces.

[0010] In some embodiments, an elastic sealing ring is provided on the top wall of the cavity of the shell containing the container. The elastic sealing ring has a first sealing contact ring, which is suspended between the inlet and the outlet. When the float is in the blocked state, the first sealing contact ring seals against the outer surface of the float. And / or, the inner wall surface of the top wall of the cavity containing the container has a slope that increases radially from the outside to the inside along the inlet.

[0011] In some embodiments, the elastic sealing ring is provided with a second sealing contact ring on the side facing the outlet. The second sealing contact ring is coaxially arranged with the first sealing contact ring, and when the float is in the blocked state, the second sealing contact ring seals against the outer surface of the float.

[0012] In some embodiments, the float is a buoy, the center of mass of which does not coincide with the center of the sphere; and / or, the outer surface of the float has no parting line.

[0013] In some embodiments, the float is a hollow sphere, and the wall thickness of a first region of the hollow sphere is greater than the wall thickness of other regions.

[0014] The float-type drain check valve provided by this invention has the following beneficial effects:

[0015] When the float is in the avoidance state, it is located in the radial outer area of ​​the drainage channel. This effectively avoids the float from obstructing the drainage channel, ensuring that the sewage discharged from the inlet can enter the outlet below without obstruction and ensure smooth drainage. On the other hand, it effectively avoids direct impact contact between the sewage and the float, thereby minimizing the adhesion of dirt in the sewage to the outer surface of the float. This prevents drainage blockage caused by excessive dirt accumulation on the outer surface of the float and greatly reduces the degree of damage to the seal of the inlet caused by dirt adhering to the outer surface of the float. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is a top view of the float-type drain check valve in use according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional view of AA in the diagram;

[0019] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0020] Figure 4 yes Figure 2 A cross-sectional view of BB in the figure, showing the float in a sealed state;

[0021] Figure 5 This is a schematic diagram of the internal structure of the float-type sewage check valve in one embodiment of the present invention, with the float in an avoidance state;

[0022] Figure 6 This is a schematic diagram of the internal structure of the float-type sewage check valve in another embodiment of the present invention, with the float in an avoidance state;

[0023] Figure 7 yes Figure 1 Exploded view of the structure of the float-type sewage check valve in China;

[0024] Figure 8 yes Figure 7 A three-dimensional structural diagram of the lower shell.

[0025] Figure 9 This is a cross-sectional view of the float in another embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the internal structure of a float-type drain check valve according to another embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 1. Valve housing; 10. Internal cavity of the housing; 11. Inlet; 111. Inlet pipe; 12. Outlet; 121. Outlet pipe; 13. Upper housing; 14. Lower housing; 2. Float; 30. Float guide sliding track; 31. Guide plate; 4. Float limiting ring platform; 41. First flow passage; 5. Limiting plate; 50. Float-sinking guide passage; 51. Second flow passage; 6. Elastic sealing ring; 61. First sealing contact ring; 62. Fixing ring; 63. Connecting ring; 631. Ring groove; 64. Second sealing contact ring; 7. Rigid ring. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0033] See also Figures 1 to 10 As shown, according to an embodiment of the present invention, a float-type sewage check valve is provided, including a valve body 1 and a float 2. The valve body 1 has a housing cavity 10. In a specific embodiment, the valve body 1 includes an upper housing 13 and a lower housing 14 that are interlocked. The upper housing 13 and the lower housing 14 can be sealed together by ultrasonic welding to form the aforementioned housing cavity 10. The float 2 is located within the housing cavity 10. The housing cavity 10 has an inlet 11 and an outlet 12. When the float-type sewage check valve is in use (e.g. Figure 2 With reference to the orientation shown in the diagram, the aforementioned inlet 11 is formed on the upper housing 13, and the outlet 12 is formed on the lower housing 14. In a specific embodiment, the aforementioned inlet 11 has an inflow pipe 111 located outside the upper housing 13, and the outlet 12 has a discharge pipe 121 located outside the lower housing 14. The inlet 11 and the outlet 12 are arranged vertically opposite each other, and the float 2 has a sealed state that blocks the inlet 11 (e.g., ...). Figures 2 to 4 (as shown) and the drainage channel formed between the inlet 11 and the outlet 12 (as shown) Figure 5 and Figure 6The radially peripheral region (not labeled in the figure) of the cylindrical area formed between the parallel red lines is shown in the figure. The bottom wall of the shell-containing cavity 10 has a guide structure (not labeled in the figure) with a float guide sliding track 30. The float guide sliding track 30 decreases in height from the inside to the outside along the radial direction of the outlet 12, guiding the float 2 to the radially peripheral region during the transition from the sealed state to the peripheral state. The float 2 can switch from the peripheral state to the sealed state under buoyancy (i.e., when external water flows back through the outlet 12 of the check valve) and switch from the sealed state to the peripheral state after the buoyancy is eliminated (i.e., when there is no water below the float 2). The aforementioned radially peripheral region refers to the annular region of the shell-containing cavity 10 located radially outside the aforementioned drainage channel along the radial direction of the outlet 12. Figure 5 The region radially outside the red parallel lines shown in the diagram. It should be noted that the aforementioned float guide sliding track 30 can specifically be a contact surface or contact line capable of providing sliding guidance for the float.

[0034] In this technical solution, when the float 2 is in the avoidance state, it is located in the radial outer area of ​​the drainage channel. This effectively avoids the float 2 from obstructing the drainage channel, ensuring that the sewage discharged from the inlet 11 can enter the outlet 12 below without obstruction and ensure smooth drainage. On the other hand, it effectively avoids the direct impact of sewage on the float 2, thereby minimizing the adhesion of dirt in the sewage to the outer surface of the float 2. This avoids drainage blockage caused by excessive dirt accumulation on the outer surface of the float 2, and also greatly reduces the degree of damage to the sealing of the inlet 11 caused by dirt adhering to the outer surface of the float 2.

[0035] It should be noted that the float-type drain check valve of this application is specifically applied to the drain pipe of a car (such as the drain pipe of the interior unit of the car cabin air conditioner). In this way, when the vehicle generates sewage, it can be discharged to the outside of the vehicle through the one-way valve to prevent sewage from entering the vehicle cabin. When the vehicle is in water, external water may rise along the end of the drain pipe and eventually enter the inner cavity 10 of the valve body 1 through the outlet 12, which is a case of water backflow. Due to the setting of the float 2 of this application, when external water backflows into the inner cavity 10 of the valve body, it is floated up and switches from the aforementioned avoidance state to the sealing state, thus preventing external water from backflowing into the vehicle cabin. It is worth emphasizing that, since the float 2 in this application is guided to an area outside the drainage channel during the sewage discharge process, it will not adversely occupy the sewage discharge cross-sectional area, thus ensuring smooth drainage. At the same time, since the sewage no longer directly impacts and contacts the float 2, the difficulty of dirt in the sewage (such as soil particles, leaves, grass roots, feathers, etc.) adhering to the outer surface of the float 2 is greatly increased. This eliminates drainage blockage caused by dirt accumulation and leakage caused by dirt adhering to the sealing area of ​​the convection inlet 11 of the float 2.

[0036] In some embodiments, the guiding structure can specifically be an inclined surface structure tilted towards one side of the shell's internal cavity 10. This inclined surface structure is also the aforementioned float guiding sliding track 30. This allows the float 2 to be guided from the center of the shell's internal cavity 10 to the aforementioned radially peripheral area under its own weight when there is no water backflow under the float 2, i.e., when the float 2 lacks buoyancy support. This achieves the offset of the float 2 when it is in an avoidance state. The aforementioned inclined surface structure with a single guiding direction objectively achieves offset guidance of the float 2 in only one direction. See specific examples in some embodiments. Figure 4 As shown, the guiding structure includes two spaced-apart guide plates 31. In a preferred embodiment, the two guide plates 31 are symmetrically spaced and parallel about the center of the outlet 12. The guide plates 31 protrude towards the side closer to the inlet 11, and are higher in the middle and lower on both sides. The top surface of the guide plates 31 forms the float guiding sliding track 30. It is understood that, as Figure 2 As shown, for the same guide plate 31, the aforementioned float guide sliding rails 30 are two symmetrically arranged, and the high points of the two float guide sliding rails 30 are connected, thus forming an upwardly protruding point at the connection position of the two float guide sliding rails 30, preventing the float 2 from stopping at this point. See details. Figure 2 As shown, in a specific embodiment, the plane at the highest point of the top surface of the two aforementioned guide pieces 31 coincides with a cross-section of the outlet 12.

[0037] In this technical solution, two parallel and spaced guide plates 31 are used to provide more reliable and stable bias guidance for the float 2. Simultaneously, the highest point of the float guide sliding track 30 on the top surface of each guide plate 31 is located at the midpoint of its sliding guidance direction, enabling the float 2 to be guided along... Figure 2 The offset guidance and avoidance on the left or right side of the indicated position can adapt to uneven road conditions after the one-way valve is applied to moving objects such as vehicles, ensuring that float 2 is guided to the relatively lower side, effectively ensuring that float 2 can be reliably placed outside the aforementioned drainage channel.

[0038] It is understandable that when the aforementioned float guide sliding track 30 is merely an inclined structure running from high to low in one direction, for example, when the float guide sliding track 30 is... Figure 2 When the left side is higher than the right side in the indicated orientation, and the vehicle is traveling on a road surface that is higher than the left side, the inclined structure in one direction will lose its ability to offset and avoid the float 2. However, the float guide sliding track 30 with a high middle and low ends in the aforementioned technical solution can be well adapted to this working condition and ensure reliable offset and avoidance of the float 2.

[0039] In some embodiments, a float limiting ring 4 is also provided on the bottom wall of the cavity 10 inside the shell. The float limiting ring 4 is arranged around the outlet 12. When the float 2 is in the avoidance state, the radial outer ring wall surface of the float limiting ring 4 abuts against the outer surface of the float 2 near the outlet 12 at a first point (not indicated in the figure) to achieve radial limiting of the float 2.

[0040] In this technical solution, the radial outer ring wall of the float limiting ring platform 4 forms a limit on the radial inner outer surface of the float 2 located in the aforementioned radial outer perimeter area, ensuring that the float 2 is reliably and stably located in the radial outer region away from the drainage channel, reducing the possibility of the float 2 re-entering the drainage channel due to position changes caused by the application conditions (e.g., a vehicle on an uneven road surface) in the one-way valve.

[0041] In some implementation methods, see details. Figure 5 As shown, the radial inner ring wall of the float limiting ring platform 4 has a structure with a gradually expanding diameter from bottom to top, forming an inverted horn mouth. This allows it to collect and discharge as much sewage as possible from the upper inlet 11, greatly reducing the possibility of sewage splashing onto the radial outer area of ​​the float limiting ring platform 4. It also forms an isolation between the inner and outer areas of the lower region of the shell cavity 10, which helps to reduce or even eliminate the decrease in the cleanliness of the outer surface of the float 2 in the avoidance state during the sewage discharge process. This, in turn, helps to ensure that the one-way valve still has a strong sealing ability after sewage discharge.

[0042] In some embodiments, the two guide pieces 31 are integrally formed on the float limiting ring platform 4. In this case, the float limiting ring platform 4 can objectively form a reinforcing structure at the connection position between each guide piece 31 and the bottom wall of the cavity 10 inside the shell, ensuring the structural strength of the guide piece 31.

[0043] In some implementations, see Figure 5 As shown, the minimum radial distance between the first point and the inlet 11 is fa, and the farthest radial distance between the first point and the outer surface of the float 2 in the avoidance state near the outlet 12 is fb, where fa > fb.

[0044] In this technical solution, the radial distance between the float 2 in the avoidance state and the inlet 11 is limited, which can prevent the float 2 from directly contacting the water flowing out of the inlet 11 to the greatest extent, further reducing the possibility of dirt in the water adhering to the outer surface of the float 2, avoiding the reduction of the drainage cross section of the float 2, and ensuring smooth discharge of sewage.

[0045] In some embodiments, the float limiting ring platform 4 has a first flow channel 41 connecting its radially inner and outer sides, see details below. Figure 8 As shown, the first flow channel 41 is a notch extending from its top toward the bottom wall of the cavity 10 inside the shell. It can be understood that the bottom side of the notch is smoothly flush with the bottom wall of the cavity 10 inside the shell.

[0046] In this technical solution, a first flow channel 41 that can penetrate the radial inner and outer sides of the float limiting ring platform 4 is provided to facilitate the timely discharge of water that splashes to the radial outer side of the float limiting ring platform 4, that is, the discharge channel that is separated from the discharge outlet 12, and to prevent this part of the water from accumulating in the radial outer area of ​​the float limiting ring platform 4 and causing pollution to the float 2.

[0047] In some implementation methods, see details. Figure 7 As shown, the bottom wall of the cavity 10 inside the shell is also provided with a limiting structure (not indicated in the figure). The limiting structure includes two parallel and spaced limiting plates 5, forming a floating and sinking guide channel 50 between the two limiting plates 5. The guide structure and the float 2 are both located within the floating and sinking guide channel 50, and the floating and sinking guide channel 50 extends along the guiding direction of the float guide sliding track 30. It can be understood that the distance between the two limiting plates 5 should be slightly larger than the diameter of the float 2, but not too large. In principle, the distance between the two limiting plates 5 should be 0.5 mm to 1 mm larger than the diameter of the float 2, so as to ensure that the float 2 floats and sinks smoothly while also achieving the purpose of limiting its rise and fall.

[0048] In this technical solution, parallel limiting pieces 5 are set on the bottom wall of the cavity 10 inside the shell to form a floating and sinking guide channel 50, which limits the floating and sinking path of the float 2. Especially in the case of backflow of water in the one-way valve, the float 2 can float more accurately to the inlet 11 above it under the guidance of the floating and sinking guide channel 50 and form a seal.

[0049] In some embodiments, each of the limiting plates 5 is provided with a second flow channel 51 in the center, which connects the two sides away from the outlet 12. Preferably, the second flow channel 51 is provided at the lowest area of ​​the connection position between the limiting plate 5 and the bottom wall of the cavity to prevent sewage accumulation on the side of the limiting plate 5 away from the outlet 12.

[0050] In some embodiments, the inlet 11 and the outlet 12 are coaxially arranged, the diameter d of the inlet 11 is smaller than the diameter D of the outlet 12, and / or the diameter d of the inlet 11 is smaller than the distance L between the two guide pieces 31.

[0051] In this technical solution, the diameter of the inlet 11 and the outlet 12, as well as the distance between them and the two guide plates 31, are limited. This ensures that the water (dirty sewage) flowing out of the inlet 11 can be discharged directly through the outlet 12 as much as possible, and avoids contact and collision between the dirty sewage and the outlet 12 and the guide plates 31 as much as possible, thereby reducing the impact and splashing of dirty sewage in the inner cavity 10 of the shell.

[0052] See details Figure 6 As shown, when float 2 is in the avoidance state, float 2 and the aforementioned drainage channel (i.e. Figure 6 The minimum radial spacing of the cylindrical area (indicated by the parallel red lines) is S, where S > 0 and is generally better the larger it is.

[0053] The bottom wall of the inner cavity 10 of the shell is specifically a conical surface that is larger at the top and smaller at the bottom. The outlet 12 is located at the apex of the inverted conical surface, which is also the lowest position. This can greatly reduce the accumulation of water flowing into the inlet 11 in the inner cavity 10 of the shell.

[0054] In some embodiments, the inner wall surface of the cavity top wall of the shell-containing cavity 10 has a slope that gradually increases in the radial direction from the outside to the inside along the inlet 11. This allows the float 2 to be guided to the inlet 11 through the cooperation between the slope and the outer surface of the float 2, ensuring that the float 2 can smoothly switch from the avoidance state to the sealed state.

[0055] In some embodiments, an elastic sealing ring 6 is provided on the top wall of the cavity 10 inside the shell. The elastic sealing ring 6 has a first sealing contact ring 61, which is suspended between the inlet 11 and the outlet 12. When the float 2 is in the blocked state, the first sealing contact ring 61 seals against the outer surface of the float 2. See [reference needed] Figure 3 As shown, the elastic sealing ring 6 is located in the upper region of the inclined surface to facilitate smooth alignment of the float 2 with the inlet 11 during its ascent. The aforementioned suspension refers to the axial alignment of the first sealing contact ring 61 and the aforementioned inlet 11 within the one-way valve (i.e.,...). Figure 3 There is a gap in the vertical direction (as shown in the diagram), and there is also a gap in the axial direction between the valve and the aforementioned outlet 12.

[0056] In this technical solution, compared with the arrangement of the elastic sealing ring 6 being attached to the opening platform of the inlet 11 in the prior art, the first sealing contact ring 61 of the elastic sealing ring 6 in this application is suspended, which has greater flexibility. This allows the float 2 to have greater deformation capacity under the action of buoyancy when it is in a sealed state, thereby making the fit and sealing between the float 2 and the elastic sealing ring 6 stronger and achieving a high-precision anti-seepage effect.

[0057] It should be noted that in related technologies, in order to ensure the contact sealing between the elastic sealing ring and the float 2, pressure devices such as springs and cylinders are often used to improve the fit between the float 2 and the elastic sealing ring. However, the elastic sealing ring 6 is improved in this application by being suspended, which increases the flexible deformation capacity of the elastic sealing ring 6. In this way, when the float 2 is floating and in a sealed state, the buoyancy can be used to form an axially upward arch on the elastic sealing ring 6. The axial displacement compensation of the elastic sealing ring 6 is more free, which makes its fit with the outer surface of the float 2 tighter and significantly improves the sealing performance.

[0058] It is understandable that the inner ring of the first sealing contact ring 61 is coaxially arranged with the inlet 11, and the inner wall diameter of the first sealing contact ring 61 is larger than the diameter of the inlet 11. This can greatly reduce the probability of water flowing into the inlet 11 contacting the first sealing contact ring 61. It is even possible to completely prevent water from contacting the first sealing contact ring 61 by appropriately increasing the inner wall diameter of the first sealing contact ring 61, thereby preventing dirt in the water from adhering to the first sealing contact ring 61 and further improving the sealing performance of the float 2 after contact with it.

[0059] In some embodiments, the elastic sealing ring 6 further has a fixing ring 62 fixedly connected to the top wall of the cavity 10 of the shell. The fixing ring 62 is integrally formed with the first sealing contact ring 61 via a connecting ring 63. The connecting ring 63 has an annular groove 631 concentrically arranged with the first sealing contact ring 61. In some embodiments, the aforementioned fixing ring 62 can be assembled on the top wall of the cavity 10 of the shell by means of adhesive bonding or other methods.

[0060] In this technical solution, the connecting ring 63 of the elastic sealing ring 6 is further provided with an annular groove 631, which can reduce the thickness of the connecting ring 63 and thus improve the deformation ability of the first sealing contact ring 61 in the suspended state, further improve its fit with the outer surface of the float 2, and improve the sealing effect.

[0061] In some implementations, see Figure 10 As shown, the elastic sealing ring 6 has a second sealing contact ring 64 on the side facing the outlet 12. The second sealing contact ring 64 is coaxially arranged with the first sealing contact ring 61, and when the float 2 is in the blocked state, the second sealing contact ring 64 seals against the outer surface of the float 2. In this way, together with the aforementioned first sealing contact ring 61, a double contact seal with the float 2 can be formed to prevent backflow when dirt adheres to the outer surface of the float 2. In some embodiments, in order to further improve the sealing effect of the float 2 against the inlet 11 in the sealed state, the second sealing contact ring 64 can be provided in two or more layers to form more seals.

[0062] It is understandable that the inner ring diameter of the second sealing contact ring 64 is larger than the inner ring diameter of the first sealing contact ring 61.

[0063] In some embodiments, the aforementioned second sealing contact ring 64 is disposed in the region of the elastic sealing ring 6 corresponding to the ring groove 631, so as to further enhance the deformation capability of the second sealing contact ring 64.

[0064] See Figure 2 and Figure 3 As shown, the fixing ring 62 has a first protruding ring (not shown in the figure) extending toward the top wall of the cavity 10 inside the shell. The top wall of the cavity 10 inside the shell has a corresponding first ring groove (not shown in the figure) that is inserted and matched with the first protruding ring. Adhesive can be provided between the first protruding ring and the first ring groove to achieve a fixed connection between the fixing ring 62 and the upper shell 13.

[0065] See also Figure 3As shown, the fixed ring 62 also has a second protruding ring (not indicated in the figure) extending towards the bottom wall of the cavity 10 inside the shell. The second protruding ring is coaxially arranged with the inlet 11. A rigid ring 7 is assembled inside the second protruding ring. The port of the rigid ring 7 facing the outlet 12 has a chamfer (not indicated in the figure). On the one hand, by setting the rigid ring 7, the shape retention ability of the non-suspended part of the elastic sealing ring 6 can be improved. On the other hand, the chamfer structure of the rigid ring 7 can be used to guide the upward movement of the float 2.

[0066] See Figure 3 As shown, there is a radial distance w between the outer ring wall of the rigid ring 7 and the inclined surface of the top wall of the cavity 10 of the aforementioned shell. In order to ensure that the upward floating process of the float 2 is not blocked, w should not be greater than the radius of the float 2.

[0067] The aforementioned float 2 can, in principle, be a hemispherical shape with a top that forms a sealing contact with the aforementioned first sealing contact ring 61. In some embodiments, the float 2 is a float ball (with the same diameter), and the center of mass of the float ball does not coincide with its center of gravity. That is, the center of mass of the float 2 is offset rather than centered. In this way, the float 2 can utilize the principle of a self-righting toy to ensure that its specific state remains relatively stable regardless of whether it floats or not. That is, whether the float 2 is in a sealed state or a clearance state, its upper and lower parts remain unchanged, preventing the phenomenon that the lower part, which is more prone to adhering to dirt, flips to become the upper part due to the inversion of the upper and lower parts of the float 2, and thus the seal is not tight when it comes into contact with the elastic sealing ring 6. It is understandable that dirt in the water body when the one-way valve drains or dirt from the water body outside the one-way valve that flows back into the shell inner cavity 10 may accumulate in the shell inner cavity 10, and the float 2 is more likely to come into contact with this accumulated dirt.

[0068] The centroid deviation of the aforementioned float 2 can be achieved in various ways. For example, it can be achieved by using different density materials for different positions of the float 2. In some embodiments, see [link to specific implementation details]. Figure 9 As shown, the float 2 is a hollow sphere, and the wall thickness of the first region of the hollow sphere is greater than the wall thickness of the other regions. Figure 9 As shown, the first region is also the bottom wall region of the hollow sphere.

[0069] In this technical solution, the deviation between the center of mass and the center of the sphere is achieved by designing the wall thickness of the hollow sphere to be unequal, which simplifies the structure and manufacturing process.

[0070] In some embodiments, the outer surface of the float 2 has no parting line, ensuring that the outer surface of the float 2 is completely smooth and without protrusions. This prevents the presence of parting lines from causing poor fit between the float and the elastic sealing ring 6, resulting in gaps and inadequate sealing. Specifically, the float 2 without parting lines can be achieved using a ball milling process.

[0071] In some existing vehicles, to ensure reliable underwater operation (i.e., preventing backflow) while simultaneously discharging wastewater, a dedicated valve opening and closing mechanism is required. Furthermore, after discharge, the sealed channel retains wastewater and debris, necessitating a separate wastewater residue removal system (feathers, grass roots, hair, mud, etc.) and corresponding operating condition control information transmission sensing circuitry. This entire system is complex, unreliable, and costly—essentially an "active, servo-based control system" in the industry. This invention, through the design and application of purely mechanical structures and physical principles, employs simple injection molding and ball milling processes to achieve the desired functionality, improve reliability, and reduce costs by approximately 70%-95% compared to the former approach.

[0072] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A float-type drain check valve, characterized in that, The valve includes a valve housing (1) and a float (2). The valve housing (1) has a housing cavity (10), and the float (2) is located inside the housing cavity (10). The housing cavity (10) has an inlet (11) and an outlet (12). With reference to the orientation of the float-type sewage check valve in use, the inlet (11) and the outlet (12) are arranged vertically opposite each other. The float (2) has a sealing state that blocks the inlet (11) and a radial drainage channel formed between the inlet (11) and the outlet (12). In the peripheral region avoidance state, the bottom wall of the cavity of the shell (10) has a guide structure, the guide structure has a float guide sliding track (30), the float guide sliding track (30) is lower and lower from the inside to the outside along the radial direction of the outlet (12), so as to guide the float (2) to the radial peripheral region during the process of the float (2) switching from the sealed state to the avoidance state, and the float (2) can switch from the avoidance state to the sealed state under the action of buoyancy and switch from the sealed state to the avoidance state after the buoyancy is eliminated.

2. The float-type drain check valve according to claim 1, characterized in that, The guiding structure includes two spaced-apart guide plates (31), which protrude toward the side near the inlet (11) and are higher in the middle and lower on both sides. The top surface of the guide plate (31) forms the float guiding sliding track (30).

3. The float-type drain check valve according to claim 2, characterized in that, The bottom wall of the cavity (10) of the shell is also provided with a float limiting ring platform (4). The float limiting ring platform (4) is arranged around the outlet (12). When the float (2) is in the avoidance state, the radial outer ring wall of the float limiting ring platform (4) abuts against the outer surface of the float (2) near the outlet (12) at a first point to achieve radial limiting of the float (2).

4. The float-type drain check valve according to claim 3, characterized in that, The minimum radial distance between the first point and the inlet (11) is fa, the farthest radial distance between the first point and the outer surface of the float (2) in the avoidance state near the outlet (12) is fb, fa > fb; and / or, the float limiting ring platform (4) has a first flow channel (41) connecting its radial inner and outer sides.

5. The float-type drain check valve according to claim 2, characterized in that, The bottom wall of the cavity (10) inside the shell is also provided with a limiting structure. The limiting structure includes two parallel and spaced limiting pieces (5). A floating and sinking guide channel (50) is formed between the two limiting pieces (5). The guide structure and the float (2) are both located in the floating and sinking guide channel (50).

6. The float-type drain check valve according to claim 2, characterized in that, The inlet (11) and the outlet (12) are coaxially arranged, the diameter d of the inlet (11) is smaller than the diameter D of the outlet (12), and / or the diameter d of the inlet (11) is smaller than the distance L between the two guide pieces (31).

7. The float-type drain check valve according to claim 2, characterized in that, The top wall of the cavity of the shell containing cavity (10) is provided with an elastic sealing ring (6), the elastic sealing ring (6) has a first sealing contact ring (61), the first sealing contact ring (61) is suspended between the inlet (11) and the outlet (12), and when the float (2) is in the blocked state, the first sealing contact ring (61) seals against the outer surface of the float (2); and / or, the inner wall surface of the top wall of the cavity of the shell containing cavity (10) has a slope that is increasingly higher from the outside to the inside along the radial direction of the inlet (11).

8. The float-type drain check valve according to claim 7, characterized in that, The elastic sealing ring (6) is provided with a second sealing contact ring (64) on the side facing the outlet (12). The second sealing contact ring (64) is coaxially arranged with the first sealing contact ring (61), and when the float (2) is in the blocked state, the second sealing contact ring (61) seals against the outer surface of the float (2).

9. The float-type drain check valve according to claim 1, characterized in that, The float (2) is a buoy, the center of mass of the buoy does not coincide with its center of mass; and / or, the outer surface of the float (2) has no parting line.

10. The float-type drain check valve according to claim 9, characterized in that, The float (2) is a hollow sphere, and the wall thickness of the first region of the hollow sphere is greater than the wall thickness of the other regions.

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