Micro-resistance slow closing check valve

Abstract

This invention relates to the field of check valve technology, specifically to a low-resistance, slow-closing check valve, comprising a valve body, a reciprocating check block disposed inside the valve body, an adjusting mechanism disposed inside the valve body, and a return flow mechanism disposed on both sides of the valve body. The valve body includes a first housing and a second housing, the second housing and the first housing being sealed together at their joints. One end of the valve body is provided with an outlet pipe for outputting water flow; one end of the second housing is provided with an inlet pipe for inputting water flow, and mounting holes are symmetrically opened on both sides of the outlet end inside the second housing. The return flow mechanism includes a guide pipe horizontally installed inside the outlet pipe, with a first water pipe at both ends of the guide pipe, and a filter device for filtering impurities in the water flow at the end of the first water pipe away from the guide pipe. This application solves the problem of the check block closing rapidly when pushed by a reverse-flowing water flow.

Description

Technical Field

[0001] This invention relates to the field of check valve technology, specifically to a low-resistance slow-closing check valve. Background Technology

[0002] The low-resistance, slow-closing check valve is a valve specifically designed for water supply and drainage pipelines. It is typically installed at the pump outlet, and its main function is to prevent backflow of the medium and eliminate destructive water hammer, ensuring the safe operation of the pipeline network. This valve features a compact structure, small size, light weight, low fluid resistance, stable and reliable sealing performance, wear resistance, and long service life. Its working principle relies on the head effect of the inlet medium flow; the valve disc automatically opens to allow the medium to pass through, and automatically closes when the water flow stops. However, the valve disc does not immediately close completely, but leaves a certain opening to reduce water hammer pressure, and then slowly closes. Low-resistance, slow-closing check valves are widely used in industrial, agricultural, urban water supply, and drainage systems.

[0003] Chinese patent document CN217177541 U discloses a low-resistance, slow-closing check valve, comprising a valve body with an inlet and an outlet on its left and right sides respectively. An inlet pipe and an outlet pipe are fixedly connected to the left and right sides of the valve body respectively. A fixing strip is fixedly connected to the inner wall of the outlet. A sliding sleeve is fixedly connected to the left side of the fixing strip. An elastic element is fixedly connected to the inner wall of the right side of the sliding sleeve. A sliding column is fixedly connected to the left side of the elastic element, and a valve plate is fixedly connected to the left side of the sliding column. This low-resistance, slow-closing check valve, through its check structure, allows the sliding column to slide within the sliding sleeve via the elastic element. The contraction and extension of the elastic element are gradual. Under water pressure, the gradual contraction provides low resistance to the water flow; when the water pressure is removed, the gradual extension is the slow-closing process. This device achieves the dual function of low-resistance, slow-closing in a single component, with a simple structure and low manufacturing cost.

[0004] The micro-resistance slow-closing check valve in the aforementioned patent document operates by using a spring to push a sliding column, which in turn drives a valve plate to close the inlet. However, when the water flow inside the valve stops, the thrust on the valve plate disappears. Simultaneously, the spring's reaction force pushes the valve plate to quickly close the inlet, preventing the valve from achieving its intended slow closure. Therefore, a micro-resistance slow-closing check valve is proposed. Summary of the Invention

[0005] To address the aforementioned problems, a low-resistance, slow-closing check valve is provided. The check block is gradually pushed closer to the output end of the second housing by the reverse flow of water. Simultaneously, a portion of the backflowing water enters the drain pipe, and then the first water pipe, filter device, and second water pipe installed at both ends of the drain pipe introduce water into the sleeve. When the water enters the sleeve, it pushes the piston to move horizontally, causing the piston to simultaneously push the push rod to extend out of the sleeve. At this point, the extended end of the push rod extends out of the mounting hole. This solves the problem of the check block closing rapidly under the push of the reverse flow of water.

[0006] To address the problems of existing technologies, this invention provides a low-resistance slow-closing check valve, comprising a valve body, a check block reciprocating inside the valve body, an adjusting mechanism inside the valve body, and a return mechanism on both sides of the valve body. The valve body includes a first housing and a second housing, with the second housing and the first housing sealed together. One end of the valve body is provided with an outlet pipe for outputting water flow; one end of the second housing is provided with an inlet pipe for inputting water flow; and mounting holes are symmetrically provided on both sides of the output end inside the second housing.

[0007] The reflux mechanism includes a diversion pipe horizontally installed inside the outlet pipe. Both ends of the diversion pipe are provided with a first water pipe. The end of the first water pipe away from the diversion pipe is provided with a filter device for filtering impurities in the water flow. The end of the filter device away from the first water pipe is provided with a second water pipe. The end of the second water pipe away from the filter device is connected to a slow-closing mechanism installed inside the mounting hole.

[0008] The slow-closing mechanism includes a sleeve, inside which a push rod is movably mounted; one end of the push rod is fixed with a piston that can contact the inner wall of the sleeve.

[0009] As a technical solution of the present invention, the drainage tube is provided with two relatively independent inner cavities. An inlet for water flow back is opened on one side of the inner cavity, and the inlet faces the direction of water flow output.

[0010] As one technical solution of the present invention, the filtration device includes a first mounting base that can be fixedly connected to a first water pipe, and a filter element for filtering water flow is installed inside the first mounting base.

[0011] As a technical solution of the present invention, a sealing gasket is installed on one side of the filter element, and a second mounting sleeve is provided on one side of the sealing gasket; a first mounting sleeve for fixing the second mounting sleeve is provided on the outside of the end of the first mounting seat away from the first water pipe, and the inner side of one end of the first mounting sleeve is threadedly connected to the outside of the second mounting sleeve.

[0012] As one technical solution of the present invention, a control valve for controlling the water flow rate is installed on the outside of the first water pipe.

[0013] As one technical solution of the present invention, the adjusting mechanism includes a rotating shaft that is horizontally installed inside the valve body and can rotate; a spring for mounting the rotating shaft is fixed at the output end of the valve body, and one end of the rotating shaft is rotatably disposed at the center of the spring; a spline shaft that can slide with the check block is provided at the end of the rotating shaft away from the spring.

[0014] As a technical solution of the present invention, the valve body is provided with sliding rods for limiting positions symmetrically arranged near the top and bottom; the rotating shaft is provided with an external thread near the center, and a threaded sleeve is installed on the outside of the external thread; a spring for pushing the check block is installed at one end of the threaded sleeve; a fixing rod is symmetrically fixed on the outside of the threaded sleeve, and a limiting hole is provided at the end of the fixing rod away from the threaded sleeve, which can slide and connect with the sliding rod.

[0015] As one technical solution of the present invention, a frustum is provided on the top of the valve body, and a rotatable worm is provided inside the frustum; a worm wheel that can mesh with the worm is fixed at one end of the rotating shaft.

[0016] As one technical solution of the present invention, a handwheel for controlling the rotation of the worm gear is fixed at the top end of the worm gear.

[0017] As one technical solution of the present invention, the top ends of the first housing and the second housing are fixed with sealing caps for sealing.

[0018] The advantages of this invention compared to the prior art are:

[0019] 1. This application utilizes the reverse flow of water to push the check block gradually closer to the output end of the second housing. Simultaneously, a portion of the returning water enters the drain pipe, and then the first water pipe, filter device, and second water pipe installed at both ends of the drain pipe introduce water into the sleeve. When the water enters the sleeve, it pushes the piston to move horizontally, causing the piston to move and simultaneously push the push rod to extend out of the sleeve. At this time, the extended end of the push rod will extend out of the mounting hole. This solves the problem of the check block closing rapidly when pushed by the reverse flow of water.

[0020] 2. This application designs two independent inner cavities within the drainage pipe, with several water inlets equidistantly positioned on one side of each cavity. This allows water flowing in opposite directions to enter the inner cavities through the inlets, ensuring that the water pressure inside both cavities remains the same. This, in turn, guarantees that the extension lengths of the two sets of push rods are consistent, solving the problem of inconsistent extension lengths in traditional push rod designs.

[0021] 3. This application installs the filter element inside the first mounting base, so that when the water flows through the first mounting base, the filter element can filter the impurities in the water flow, preventing impurities in the water from entering the sleeve and accumulating inside, thereby preventing the sleeve from becoming clogged. Attached Figure Description

[0022] Figure 1 This is a 3D diagram of a low-resistance, slow-closing check valve.

[0023] Figure 2 This is a top view of a low-resistance, slow-closing check valve.

[0024] Figure 3 yes Figure 2 Sectional view at point AA.

[0025] Figure 4 This is a partial cross-sectional view of a low-resistance, slow-closing check valve.

[0026] Figure 5 This is a three-dimensional diagram of the buffer mechanism in a low-resistance, slow-closing check valve.

[0027] Figure 6 This is an exploded view of the buffer mechanism in a low-resistance, slow-closing check valve.

[0028] Figure 7 This is an exploded view of the slow-closing mechanism in a low-resistance slow-closing check valve.

[0029] Figure 8 This is a partial cross-sectional view of the drain tube in a low-resistance, slow-closing check valve.

[0030] Figure 9 This is an exploded view of the filter device in a low-resistance, slow-closing check valve.

[0031] Figure 10 This is a three-dimensional diagram of the regulating mechanism in a low-resistance, slow-closing check valve.

[0032] Figure 11 This is a partial sectional view of the valve body in a low-resistance, slow-closing check valve.

[0033] The following are the labels in the diagram: 1. Valve body; 11. First housing; 111. Outlet pipe; 113. Frustum; 114. Slide rod; 12. Second housing; 121. Inlet pipe; 124. Mounting hole; 2. Sealing cap; 3. Return mechanism; 31. Drain pipe; 311. Inner cavity; 312. Inlet; 32. First water pipe; 33. Control valve; 34. Filter device; 341. First mounting base; 342. First mounting sleeve; 343. Filter element; 344. Sealing gasket; 345. Second mounting sleeve; 35. Second water pipe; 36. Slow-closing mechanism; 361. Sleeve; 362. Top rod; 363. Piston; 4. Worm gear; 41. Handwheel; 5. Adjusting mechanism; 51. Rotating shaft; 511. External thread; 512. Splined shaft; 52. Worm gear; 53. Threaded sleeve; 531. Fixing rod; 532. Limiting hole; 54. Spring; 6. Check block. Detailed Implementation

[0034] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0035] See Figures 1-10 As shown, a low-resistance slow-closing check valve includes a valve body 1, a check block 6 that can reciprocate inside the valve body 1, an adjusting mechanism 5 inside the valve body 1, and a return mechanism 3 on both sides of the valve body 1. The valve body 1 includes a first housing 11 and a second housing 12, and the second housing 12 is sealed to the first housing 11 at the joint. One end of the valve body 1 is provided with an outlet pipe 111 for outputting water flow; one end of the second housing 12 is provided with an inlet pipe 121 for inputting water flow, and mounting holes 124 are symmetrically opened on both sides of the output end inside the second housing 12.

[0036] The return mechanism 3 includes a diversion pipe 31 horizontally installed inside the outlet pipe 111. Both ends of the diversion pipe 31 are provided with a first water pipe 32. The end of the first water pipe 32 away from the diversion pipe 31 is provided with a filter device 34 for filtering impurities in the water flow. The end of the filter device 34 away from the first water pipe 32 is provided with a second water pipe 35. The end of the second water pipe 35 away from the filter device 34 is connected to a slow-closing mechanism 36 installed inside the mounting hole 124.

[0037] The slow-closing mechanism 36 includes a sleeve 361, and a push rod 362 is movably installed inside the sleeve 361; one end of the push rod 362 is fixed with a piston 363 that can contact the inner wall of the sleeve 361.

[0038] The reverse flow of water pushes the check valve block 6 closer to the output end of the second housing 12. Simultaneously, a portion of the returning water enters the drain pipe 31, and is then introduced into the sleeve 361 by the first water pipe 32, the filter device 34, and the second water pipe 35 installed at both ends of the drain pipe 31. When the water enters the sleeve 361, it pushes the piston 363 to move horizontally, causing the piston 363 to push the push rod 362 out of the sleeve 361. At this time, the extended end of the push rod 362 extends out of the mounting hole 124. This ensures that the check valve block 6, as it approaches the output end of the second housing 12, first contacts the extended end of the push rod 362. Simultaneously, the check valve block 6, pushed by the reverse flow of water, squeezes the end of the push rod 362, causing the push rod 362 to slowly retract under pressure. This achieves the slow closing of the check valve.

[0039] See Figure 4 and Figure 8 As shown, the drainage pipe 31 has two relatively independent inner cavities 311. One side of the inner cavity 311 is provided with an inlet 312 for water flow back, and the inlet 312 faces the direction of water flow output.

[0040] To ensure that the push rod 362 extends synchronously, two interconnected inner cavities 311 are opened inside the drainage pipe 31, and several water inlets 312 are equidistantly opened on one side of each inner cavity 311. When the water flows in reverse, it can enter the inner cavity 311 through the water inlets 312, thus ensuring that the water flow entering the inner cavity 311 remains the same. The drainage pipe 31 then transports the water flow through the first water pipe 32, the filter device 34, and the second water pipe 35 to the slow-closing mechanism 36. This effectively ensures that the water flow output from both sides of the drainage pipe 31 remains consistent.

[0041] See Figure 1 , Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown, the filtration device 34 includes a first mounting base 341 that can be fixedly connected to the first water pipe 32, and a filter element 343 for filtering water flow is installed inside the first mounting base 341.

[0042] To prevent impurities from accumulating inside the sleeve 361, a first mounting base 341 is provided at the output end of the first water pipe 32, and a filter element 343 is installed inside the first mounting base 341. This allows the filter element 343 to filter impurities in the water flow. This effectively prevents impurities from entering the sleeve 361 with the water flow, thus avoiding blockage and malfunction of the sleeve 361.

[0043] See Figure 9 As shown, a sealing gasket 344 is installed on one side of the filter element 343, and a second mounting sleeve 345 is provided on one side of the sealing gasket 344; a first mounting sleeve 342 for fixing the second mounting sleeve 345 is provided on the outside of the end of the first mounting base 341 away from the first water pipe 32, and the inner side of one end of the first mounting sleeve 342 is threadedly connected to the outside of the second mounting sleeve 345.

[0044] To facilitate the replacement or cleaning of the filter element 343, a first mounting sleeve 342 is installed on the outside of the first mounting base 341 at the end away from the first water pipe 32, and a second mounting sleeve 345 is provided at one end of the sealing gasket 344. When replacing or cleaning the filter element 343, the first mounting sleeve 342 is rotated clockwise to separate it from the second mounting sleeve 345. At this time, the filter element 343 can be quickly removed from the inside of the first mounting base 341. When installing the filter element 343, it is placed inside the first mounting base 341, and then the sealing gasket 344 is installed on the side of the filter element 343 near the second mounting sleeve 345. The second mounting sleeve 345 is then aligned with the first mounting base 341, and finally, the first mounting sleeve 342 is rotated counterclockwise to thread the first mounting sleeve 342 and the second mounting sleeve 345 together.

[0045] See Figure 4As shown, a control valve 33 for controlling the water flow rate is installed on the outside of the first water pipe 32.

[0046] By installing a control valve 33 outside the first water pipe 32, the flow rate of water inside the first water pipe 32 can be controlled by rotating the control valve 33. When the water flow rate inside the first water pipe 32 decreases, the water pressure output from the first water pipe 32 also decreases, causing the water pressure entering the sleeve 361 to increase slowly, thereby slowing down the speed of pushing the piston 363. When the control valve 33 is opened to its maximum, the water flow rate output from the first water pipe 32 increases. When the water flow rate increases, the water can quickly fill the sleeve 361. At this time, the water pressure inside the sleeve 361 increases rapidly, which in turn allows the water pressure to quickly push the piston 363, and the piston 363 then drives the push rod 362 to quickly extend outward from inside the sleeve 361.

[0047] See Figure 10 As shown, the regulating mechanism 5 includes a rotating shaft 51 that is horizontally installed inside the valve body 1 and can rotate; a spring 54 for mounting the rotating shaft 51 is fixed at the output end of the valve body 1, and one end of the rotating shaft 51 is rotatably located at the center of the spring 54; a spline shaft 512 that can slide with the check block 6 is provided at the end of the rotating shaft 51 away from the spring 54.

[0048] When the water flows in the forward direction, it pushes the check block 6 to move along the central axis of the spline shaft 512, at which point the check block 6 separates from the output end of the second housing 12. When the water flows in the reverse direction, the reverse flow pushes the check block 6 to move along the central axis of the spline shaft 512, at which point the check block 6 gradually approaches the output end of the second housing 12 under the push of the reverse flow, and finally the check block 6 closes the output end of the second housing 12.

[0049] See Figure 3 , Figure 4 and Figure 10 As shown, the valve body 1 has symmetrically arranged sliding rods 114 for limiting positions near the top and bottom; the rotating shaft 51 has an external thread 511 near the center, and a threaded sleeve 53 is installed on the outside of the external thread 511; a spring 54 for pushing the check block 6 is installed at one end of the threaded sleeve 53; a fixing rod 531 is symmetrically fixed on the outside of the threaded sleeve 53, and a limiting hole 532 that can slide and connect with the sliding rod 114 is opened at the end of the fixing rod 53 away from the threaded sleeve 53.

[0050] To ensure effective movement of the threaded sleeve 53, a fixing rod 531 is provided on the outside of the threaded sleeve 53. A limiting hole 532 is opened at the end of the fixing rod 531 away from the threaded sleeve 53, and the fixing rod 531 is installed on the slide rod 114 through the limiting hole 532. When the rotating shaft 51 rotates, the rotating shaft 51 can drive the threaded sleeve 53 to move horizontally through the external thread 511. As the threaded sleeve 53 moves, the spring 54 can push the check block 6 to gradually approach the output end of the second housing 12 until the check block 6 completely closes the output end of the second housing 12. At this time, the check valve stops working.

[0051] See Figure 3 and Figure 4 As shown, a frustum 113 is provided on the top of the valve body 1, and a rotatable worm 4 is provided inside the frustum 113; a worm wheel 52 that can mesh with the worm 4 is fixed at one end of the rotating shaft 51.

[0052] To ensure the rotation of the rotating shaft 51, a worm gear 52 is fixed to one end of the rotating shaft 51. Then, the worm 4 is longitudinally mounted on the frustum 113, and the worm 4 can extend into the water outlet pipe 111, so that the worm 4 can mesh with the worm gear 52. When the worm 4 rotates, it can synchronously drive the worm gear 52 to rotate, and at the same time, the rotation of the worm gear 52 drives the rotating shaft 51 to rotate synchronously.

[0053] See Figure 3 and Figure 4 As shown, a handwheel 41 for controlling the rotation of the worm gear 4 is fixed to the top of the worm gear 4.

[0054] To reduce the effort required to rotate the worm 4, a handwheel 41 is fixed to the top of the worm 4. When the worm 4 needs to be rotated, the handwheel 41 is turned to drive the worm 4 to rotate, thus making it easier to rotate the worm 4.

[0055] See Figure 1 and Figure 2 As shown, the top ends of the first housing 11 and the second housing 12 are fixed with sealing caps 2 for sealing.

[0056] By fixing the sealing cap 2 to the top of the first housing 11 and the second housing 12, the sealing cap 2 can seal the top of the first housing 11 and the second housing 12, thereby preventing water from overflowing from the first housing 11 and the second housing 12. This effectively ensures the stability of the water pressure inside the first housing 11 and the second housing 12.

[0057] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A low-resistance slow-closing check valve, comprising a valve body (1), a check block (6) reciprocatingly movable inside the valve body (1), an adjusting mechanism (5) inside the valve body (1), and a reflux mechanism (3) on both sides of the valve body (1), characterized in that, The valve body (1) includes a first housing (11) and a second housing (12), and the second housing (12) and the first housing (11) are sealed together at the joint; one end of the valve body (1) is provided with an outlet pipe (111) for outputting water flow; one end of the second housing (12) is provided with an inlet pipe (121) for inputting water flow, and mounting holes (124) are symmetrically opened on both sides of the output end inside the second housing (12); The adjusting mechanism (5) includes a rotating shaft (51) horizontally mounted inside the valve body (1) and capable of rotation; a spring (54) for mounting the rotating shaft (51) is fixed at the output end of the valve body (1), and one end of the rotating shaft (51) is rotatably positioned at the center of the spring (54); a splined shaft (512) capable of slidingly connecting with the check block (6) is provided at the end of the rotating shaft (51) away from the spring (54); and symmetrically arranged inside the valve body (1) near the top and bottom are... A sliding rod (114) for limiting; an external thread (511) is provided on the outside of the rotating shaft (51) near the center, and a threaded sleeve (53) is installed on the outside of the external thread (511); a spring (54) for pushing the check block (6) is installed on one end of the threaded sleeve (53); a fixing rod (531) is symmetrically fixed on the outside of the threaded sleeve (53), and a limiting hole (532) is provided on the end of the fixing rod (531) away from the threaded sleeve (53) so as to slide with the sliding rod (114); The return mechanism (3) includes a diversion pipe (31) horizontally installed inside the outlet pipe (111). Both ends of the diversion pipe (31) are provided with a first water pipe (32). The end of the first water pipe (32) away from the diversion pipe (31) is provided with a filter device (34) for filtering impurities in the water flow. The end of the filter device (34) away from the first water pipe (32) is provided with a second water pipe (35). The end of the second water pipe (35) away from the filter device (34) is connected to a slow-closing mechanism (36) installed inside the mounting hole (124). The slow-closing mechanism (36) includes a sleeve (361), and a push rod (362) is movably installed inside the sleeve (361); one end of the push rod (362) is fixed with a piston (363) that can contact the inner wall of the sleeve (361).

2. The low-resistance slow-closing check valve according to claim 1, characterized in that, The drainage pipe (31) has two relatively independent inner cavities (311) inside. One side of the inner cavity (311) is provided with an inlet (312) for water flow back, and the inlet (312) faces the direction of water flow output.

3. The low-resistance slow-closing check valve according to claim 1, characterized in that, The filtration device (34) includes a first mounting base (341) that can be fixedly connected to the first water pipe (32), and a filter element (343) for filtering water flow is installed inside the first mounting base (341).

4. A low-resistance slow-closing check valve according to claim 3, characterized in that, A sealing gasket (344) is installed on one side of the filter element (343), and a second mounting sleeve (345) is provided on one side of the sealing gasket (344); a first mounting sleeve (342) for fixing the second mounting sleeve (345) is provided on the outside of the end of the first mounting base (341) away from the first water pipe (32), and the inner side of one end of the first mounting sleeve (342) is threadedly connected to the outside of the second mounting sleeve (345).

5. A low-resistance slow-closing check valve according to claim 1, characterized in that, The first water pipe (32) is equipped with a control valve (33) for controlling the water flow rate.

6. A low-resistance slow-closing check valve according to claim 1, characterized in that, The valve body (1) has a frustum (113) on top, and a rotatable worm (4) is provided inside the frustum (113); one end of the rotating shaft (51) is fixed with a worm wheel (52) that can mesh with the worm (4).

7. A low-resistance slow-closing check valve according to claim 6, characterized in that, The top end of the worm (4) is fixed with a handwheel (41) for controlling its rotation.

8. A low-resistance slow-closing check valve according to claim 1, characterized in that, The top ends of the first housing (11) and the second housing (12) are fixed with sealing caps (2) for sealing.

Images