A check valve assembly for use in a flushing valve

Abstract

This utility model relates to a check valve assembly for use in a flushing valve, comprising a check valve body, a mounting cap, a check control rod, and a valve plate. The check valve body has a threaded mounting hole for the cap at its upper end and a water inlet at its lower end. An annular valve seat is integrally formed inside, and a water outlet is located on the side wall. The mounting cap is threaded to the upper end of the valve body, and the check control rod is threaded into the mounting tube in its middle section. The lower end of the check control rod has a valve stem fitting hole, within which the valve stem of the valve plate is movably fitted. A spring is provided between the two to press the valve plate against the valve seat, and a sealing element is fixed to the lower side of the valve plate. The spring preload can be adjusted by rotating the check control rod, allowing the check valve opening pressure to adapt to different water supply pressures. This assembly solves the problem of fixed and unadjustable preload in existing check valves. It has a compact structure, is easy to adjust, and effectively avoids poor water flow or backflow caused by water pressure mismatch, improving the environmental adaptability of the flushing valve.

Description

Technical Field

[0001] This utility model relates to the field of flushing valve technology, and in particular to a check valve assembly for use in flushing valves. Background Technology

[0002] A flushing valve is a widely used water supply control device in public restrooms and homes. It typically integrates a check valve assembly to prevent backflow of water in the supply pipes during water outages or pressure fluctuations, thus avoiding contamination of upstream water sources. For example, a prior art flushing valve (authorization announcement number: CN219317719U) that reduces water hammer has a check valve on its inlet body. This check valve specifically includes an inlet pressure cap, a first adjusting screw, a check valve stem, a third spring, a first washer (equivalent to a valve plate), and a second washer. Its working principle is as follows: the spring force of the third spring presses the first washer against the inlet. When the inlet water pressure is sufficient to overcome the preload of the third spring, the first washer is pushed open, and water flows into the flushing valve.

[0003] However, the existing check valve structure has a significant technical flaw: the preload force of the third spring acting on the first washer is fixed, and users cannot flexibly adjust this preload force according to the actual water supply pressure in the operating environment. This leads to the following problems: when the water supply pressure is low, excessive spring preload force may prevent the check valve from opening properly, resulting in poor water flow or no water flow from the flushing valve; when the water supply pressure is high, insufficient spring preload force may cause the check valve to not close tightly, affecting the check valve's effectiveness.

[0004] Therefore, in view of the above-mentioned technical problems, this application provides a novel check valve assembly for flushing valves. This assembly, by setting an adjustable check control rod, allows users to conveniently adjust the preload of the spring according to the actual water pressure, thereby significantly improving the environmental adaptability and operational reliability of the check valve. Utility Model Content

[0005] This invention proposes a check valve assembly for use in a flushing valve, which allows the opening pressure of the check valve assembly to be flexibly adjusted according to the actual water supply pressure, thus solving the aforementioned problems existing in the prior art.

[0006] The technical solution of this utility model is implemented as follows: A check valve assembly for a flushing valve includes a check valve body, a mounting cap, a check control rod, and a valve plate. The upper end of the check valve body has a mounting cap internal thread hole, and the lower end of the check valve body has a water inlet. An annular valve seat located above the water inlet is integrally formed inside the check valve body. An outlet located above the annular valve body is formed on one side of the check valve body. The mounting cap is threadedly installed in the mounting cap internal thread hole. An installation tube extending vertically through the middle of the mounting cap is integrally formed. The check control rod is threaded into the installation tube and penetrates into the check valve body from the lower end of the installation tube. A valve stem is integrally formed on the valve plate. A valve stem mating hole is opened at the lower end of the check control rod, and the valve stem is movably mated in the valve stem mating hole. A spring is provided between the check control rod and the valve plate. The spring is used to press the valve plate against the valve seat. A sealing element is fixedly connected to the lower side of the valve plate.

[0007] Preferably, the mounting cap is threadedly connected to an upper cover assembly, which is used to cover the mounting cap, the mounting tube, and the check valve control rod.

[0008] Preferably, the upper cover assembly includes an internal threaded sleeve and a rotating cover. The internal threaded sleeve is threadedly connected to the outside of the mounting cover, and the rotating cover is rotatably connected above the internal threaded sleeve. A rotary wrench is integrally formed on the inner side of the rotating cover, and a wrench insertion hole is provided at the upper end of the check valve control rod for inserting the rotary wrench.

[0009] Preferably, the outer surface of the internal threaded sleeve is polygonal, and the rotating cover has several rotating planes circumferentially formed.

[0010] Preferably, the outer side of the internal threaded sleeve is provided with an annular retaining groove, and the rotating cover is provided with an annular protrusion that is movably fitted within the annular retaining groove.

[0011] Preferably, the mounting tube has an upper movable hole, an inner receiving hole, and a lower internal threaded hole sequentially arranged from top to bottom. The check valve control rod includes an upper rod body that is movably fitted in the upper movable hole and a threaded section that is threadedly connected in the internal threaded hole. A sealing ring groove is provided on the outer wall of the upper rod body, and a sealing ring is installed on the sealing ring groove. The sealing ring is interference-fitted with the inner wall of the upper movable hole.

[0012] Preferably, the lower end of the valve plate is integrally formed with a retainer, and the sealing element is fixed to the lower side of the valve plate by the retainer.

[0013] In summary, the beneficial effects of this utility model are as follows:

[0014] 1. By setting a check control rod that mates with the threaded mounting gland and installing a spring between the check control rod and the valve plate, the user can change the axial position of the check control rod within the check valve body by rotating it, thereby precisely adjusting the preload force of the spring pressing against the valve plate. This design allows the opening pressure of the check valve assembly to be flexibly adjusted according to the actual water supply pressure: lower the preload force when the water pressure is low to ensure opening, and increase the preload force when the water pressure is high to ensure reliable closing, effectively avoiding the drawbacks of existing technologies where the preload force is fixed and cannot adapt to different water pressure environments.

[0015] 2. The top cover assembly effectively shields and protects the internal mounting cap, mounting tube, and check valve control rod. On one hand, it prevents dust, dirt, or moisture from entering the threaded fit and adjustment mechanism, avoiding jamming or thread corrosion caused by debris, thus extending product lifespan. On the other hand, it conceals the internal adjustment structure, enhancing the overall aesthetics and integration of the product. Furthermore, the top cover assembly provides an extremely convenient, tool-free manual adjustment solution. The top cover assembly rotates to the internal threaded sleeve, and a rotary wrench is mounted on the rotating cover, engaging with the wrench socket at the top of the check valve control rod. Users simply need to grasp and rotate the rotating cover; rotating the wrench will synchronously rotate the check valve control rod, thereby adjusting the spring preload. This greatly simplifies the adjustment operation, allowing users to complete adjustments anytime, anywhere, without the need for any wrenches, screwdrivers, or other professional tools, significantly improving the user experience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of this utility model after removing the top cover assembly;

[0021] Figure 5 This is a schematic diagram of the upper cover assembly in this utility model;

[0022] Figure 6 This is an assembly diagram of the check valve control rod, valve plate, and spring structure of this utility model.

[0023] Figure 7 This is a cross-sectional structural diagram of the present invention installed on the flushing valve.

[0024] In the diagram: 1. Check valve body; 11. Internal threaded hole for gland mounting; 12. Inlet; 13. Annular valve seat; 14. Outlet; 2. Gland mounting; 21. Mounting pipe; 22. Upper movable hole; 23. Inner cavity; 24. Lower internal threaded hole; 3. Check control rod; 31. Valve stem mating hole; 32. Wrench insertion hole; 33. Upper rod body; 34. Threaded section; 35. Sealing ring groove; 4. Sealing ring; 5. Valve plate; 51. Valve stem; 52. Seal; 53. Socket; 6. Spring; 7. Internal threaded sleeve; 71. Annular clasp; 8. Rotating cover; 81. Rotating wrench; 82. Rotating plane; 83. Annular protrusion. Detailed Implementation

[0025] The following will refer to the appendix in the embodiments of this utility model. Figure 1-7 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Example:

[0027] like Figures 1 to 6 As shown, this utility model discloses a check valve assembly for use in a flushing valve, aiming to solve the problem that the preload of the check valve spring in existing flushing valves is not adjustable, resulting in an inability to adapt to different water supply pressure environments. This check valve assembly can, as... Figure 7 It is shown installed on the inlet body of the flushing valve.

[0028] The check valve assembly includes a check valve body 1, a mounting cap 2, a check control rod 3, and a valve plate 5. The check valve body 1 is the main outer shell of the assembly, and its hollow interior forms a flow channel. Specifically, a cap mounting internal thread hole 11 is provided at the upper end of the check valve body 1 for fixing the cap 2. A water inlet 12 is provided at the lower end of the check valve body 1 for connecting to a water supply pipe. Inside the check valve body 1, above the water inlet 12, an annular valve seat 13 is integrally formed. This annular valve seat 13 is used to cooperate with the sealing element 52 described later to achieve a check valve sealing function. In addition, a water outlet 14 is provided on one side wall of the check valve body 1, located above the annular valve seat 13, for guiding the water entering the valve body to the inlet channel of the flushing valve.

[0029] The mounting cap 2 has external threads, through which it is threaded into the internal threaded hole 11 of the cap mounting at the upper end of the check valve body 1, thereby sealing the upper opening of the check valve body 1. In the middle of the mounting cap 2, an integrally formed mounting tube 21 extends vertically, which is used to install and guide the check control rod 3.

[0030] The mounting tube 21 has, from top to bottom, a connected upper movable hole 22, an inner receiving hole 23, and a lower internal threaded hole 24. The check control rod 3 includes an upper rod body 33 that movably fits into the upper movable hole 22 and a threaded section 34 that is threaded into the internal threaded hole. A sealing ring groove 35 is formed on the outer wall of the upper rod body 33, and a sealing ring 4 is installed on the sealing ring groove 35. The sealing ring 4 is press-fitted with the inner wall of the upper movable hole 22 to ensure a seal. The lower end of the check control rod 3 penetrates into the check valve body 1 and has a valve stem mating hole 31. This hole is a blind hole with an opening facing downwards. The upper end face of the valve plate 5 is integrally formed with an upwardly extending valve stem 51. The outer diameter of the valve stem 51 is adapted to the inner diameter of the valve stem mating hole 31, so that the valve stem 51 can be movably inserted into the valve stem mating hole 31. This mating allows the valve stem 51 to slide up and down within the hole for a certain stroke, providing guidance for the opening and closing movement of the valve plate 5.

[0031] A spring 6 is fitted between the lower end face of the check control rod 3 and the upper end face of the valve plate 5. The upper end of the spring 6 abuts against the lower end face of the check control rod 3, and the lower end abuts against the upper end face of the valve plate 5. The spring 6 is always in a compressed state, and its elastic force is used to press the valve plate 5 downward, so that it fits tightly against the annular valve seat 13. A retainer 53 is integrally formed at the lower end of the valve plate 5, and a sealing element 52 is fixedly connected to the lower side of the valve plate 5 through the retainer 53. The sealing element 52 can be a rubber gasket or a polytetrafluoroethylene gasket. When the valve plate 5 is pressed by the spring 6, the sealing element 52 forms line contact or surface contact with the annular valve seat 13, thereby achieving a reliable seal.

[0032] In the initial state (i.e., when no water is entering), the elastic force of spring 6 presses the seal 52 against the annular valve seat 13 through the valve plate 5, and the inlet 12 and outlet 14 are in a closed state. When water flows into the water supply pipe, the water flow impacts the valve plate 5 upward from the inlet 12. When the upward thrust generated by the water pressure is greater than the downward preload of spring 6, the valve plate 5 is pushed upward, the valve stem 51 slides upward in the valve stem mating hole 31, and the seal 52 separates from the annular valve seat 13. At this time, the water flows into the valve body from the inlet 12, passes through the gap between the annular valve seat 13 and the seal 52, and then flows out from the side outlet 14, finally entering the water inlet channel of the flushing valve. When the water pressure decreases or disappears, the elastic force of spring 6 will quickly push the valve plate 5 back to its original position, and the seal 52 will re-fit against the annular valve seat 13 to prevent backflow of water. When adjustment is required, rotate the upper end of the check valve control lever 3. Because the check control rod 3 and the mounting pipe 21 are threaded together, rotating the check control rod 3 will change its axial position within the check valve body 1. For example, rotating the check control rod 3 clockwise to move it downwards will further compress the spring 6, increasing its preload on the valve plate 5, thereby increasing the opening pressure of the check valve, which is suitable for environments with high water pressure. Conversely, rotating the check control rod 3 counterclockwise to move it upwards will reduce the compression of the spring 6, lowering the preload, thereby reducing the opening pressure, which is suitable for environments with low water pressure.

[0033] To further enhance the convenience of adjustment and the aesthetics of the product, a top cover assembly is threadedly connected to the outside of the mounting cap 2. This top cover assembly can be used to cover the internal mounting cap 2, mounting tube 21, and check valve control rod 3, providing protection and aesthetic appeal. Additionally, this top cover assembly facilitates the adjustment of the preload force of the spring 6. Specifically, the top cover assembly includes an internally threaded sleeve 7 and a rotating cover 8. The inner side of the internally threaded sleeve 7 has threads for connection with the threads on the outside of the mounting cap 2. The outer surface of the internally threaded sleeve 7 is designed with a polygonal shape, allowing users to directly grasp and twist the internally threaded sleeve 7 by hand, enabling tool-free assembly and disassembly from the mounting cap 2. The rotating cover 8 is mounted above the internally threaded sleeve 7 via a rotating connection. To achieve this rotating connection, an annular retaining groove 71 is provided at the upper outer end of the internally threaded sleeve 7, and an annular protrusion 83 matching this retaining groove is provided on the inner side of the rotating cover 8. During assembly, inserting the protrusion into the slot allows the rotating cover 8 to rotate freely relative to the internal threaded sleeve 7 without axially dislodging it.

[0034] At the center of the inner side of the rotating cover 8, an integrally formed downward-extending rotary wrench 81 is formed. This rotary wrench 81 can be a cross-shaped, flat, or hexagonal protrusion; in this embodiment, it is specifically flat. Correspondingly, a wrench insertion hole 32 with a matching shape is formed at the center of the upper end face of the check control rod 3. When the entire upper cover assembly is tightened onto the mounting cap 2, the rotary wrench 81 on the rotating cover 8 is precisely inserted into the wrench insertion hole 32 of the check control rod 3. Thus, when the user pinches and rotates the rotating cover 8, the rotating cover 8 drives the rotary wrench 81, which in turn drives the check control rod 3 to rotate synchronously, thereby achieving preload adjustment by hand without any tools. To ensure that the rotary wrench 81 does not deform or become damaged during repeated adjustments, the rotating cover 8 and the rotary wrench 81 are preferably made of metal materials, such as stainless steel or brass alloys, which have good corrosion resistance and mechanical strength.

[0035] Furthermore, to further facilitate user grip and application of force, several rotating planes 82 can be evenly distributed around the outer circumference of the rotating cover 8. These planes essentially form a polygonal grip handle, increasing the friction between the fingers and the rotating cover 8, making the rotation operation more effortless and precise.

[0036] It should be further noted that, in order to allow users to know the magnitude of the adjusted preload, annular scale lines and reference arrows can be etched or printed on the outer side of the rotating cover 8, and at the corresponding positions of the internal threaded sleeve 7 or the mounting cap 2. Each rotation corresponds to a known increment in the preload of the spring 6 (which can be converted into a pressure value through factory calibration).

[0037] In summary, the check valve assembly for flushing valves provided in this application, by incorporating a threaded adjustable check control rod 3, allows for flexible adjustment of the spring 6 preload according to actual water pressure, significantly enhancing the product's adaptability to different water supply environments. Furthermore, the addition of a top cover assembly with a rotary wrench 81 enables tool-free manual adjustment, making operation extremely convenient. This assembly features a sophisticated structural design and reliable sealing, addressing the pain points of existing technologies while improving the user experience.

[0038] In addition, in actual use, users can judge whether the adjusted preload is appropriate by using two dynamic feedbacks: "number of rotations / feel" and "actual water output and closing effect of the flush valve".

[0039] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A check valve assembly for use in a flushing valve, comprising a check valve body, a mounting gland, a check control rod, and a valve plate, characterized in that: The check valve body has a pressure cap mounting internal thread hole at its upper end and a water inlet at its lower end. An annular valve seat is integrally formed inside the check valve body, located above the water inlet. An outlet is located on one side of the check valve body, above the annular valve body. The pressure cap is threaded into the pressure cap mounting internal thread hole. A through-hole mounting tube is integrally formed in the middle of the pressure cap. The check control rod is threaded into the mounting tube and penetrates into the check valve body from the lower end of the mounting tube. A valve stem is integrally formed on the valve plate. A valve stem mating hole is formed at the lower end of the check control rod, and the valve stem is movably mated within the valve stem mating hole. A spring is provided between the check control rod and the valve plate, and the spring is used to press the valve plate against the valve seat. A sealing element is fixedly connected to the lower side of the valve plate.

2. A check valve assembly for use in a flushing valve according to claim 1, characterized in that: The mounting cap is threadedly connected to an upper cover assembly, which is used to cover the mounting cap, mounting tube, and check valve control rod.

3. A check valve assembly for use in a flushing valve according to claim 2, characterized in that: The upper cover assembly includes an internal threaded sleeve and a rotating cover. The internal threaded sleeve is threadedly connected to the outside of the mounting cover, and the rotating cover is rotatably connected above the internal threaded sleeve. A rotary wrench is integrally formed on the inner side of the rotating cover. A wrench insertion hole is provided at the upper end of the check valve control rod for inserting the rotary wrench.

4. A check valve assembly for use in a flushing valve according to claim 3, characterized in that: The outer surface of the internal threaded sleeve is polygonal, and the rotating cover has several rotating planes circumferentially formed.

5. A check valve assembly for use in a flushing valve according to claim 3 or 4, characterized in that: The outer side of the internal threaded sleeve is provided with an annular retaining groove, and the rotating cover is provided with an annular protrusion that is movably fitted into the annular retaining groove.

6. A check valve assembly for use in a flushing valve according to claim 1, characterized in that: The mounting tube has an upper movable hole, an inner receiving hole, and a lower internal threaded hole connected sequentially from top to bottom. The check valve control rod includes an upper rod body that is movably fitted in the upper movable hole and a threaded section that is threadedly connected in the internal threaded hole. A sealing ring groove is provided on the outer wall of the upper rod body, and a sealing ring is installed on the sealing ring groove. The sealing ring is interference-fitted with the inner wall of the upper movable hole.

7. A check valve assembly for use in a flushing valve according to claim 1, characterized in that: The lower end of the valve plate is integrally formed with a retainer, and the sealing element is fixed to the lower side of the valve plate through the retainer.

Images