Check valve with valve plate slow closing function

Abstract

The utility model relates to the technical field of check valves, in particular to a check valve with a valve plate slow closing function, which comprises a valve body, a valve cover, a mounting shell, a valve rod, a valve clack, a spring and a partition plate. The valve cover is connected with the valve body, the partition plate is connected with the inner wall of the valve body, and the valve rod is slidably connected with the valve cover. The spring sleeves the outer side of the valve rod and is connected with the valve cover and the valve clack; the mounting shell is connected with the valve cover, the two extrusion assemblies are slidably connected with the mounting shell, and the extrusion assemblies are pressed on the peripheral surface of the valve rod; an adjusting assembly used for adjusting the distance between the two extrusion assemblies is arranged in the mounting shell. The extrusion assembly can exert certain pressure on the valve rod when the valve rod descends, and the descending speed of the valve rod is reduced; the adjusting assembly can adjust the distance of the extrusion assembly, namely, the descending resistance of the valve rod can be adjusted, the descending speed of the valve rod is further adjusted, and the check valve is more flexible to use.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a check valve with a valve plate slow-closing function. Background Art

[0002] Check valves are often installed at the outlet of water pumps in water supply and drainage pipelines to prevent water from flowing backward when the pump stops. However, in some current water supply and drainage pipelines, traditional check valves typically only have a one-way tilting disc or two fan-shaped butterfly-shaped discs within the valve body. When the pump stops, the disc loses the driving force of the medium, causing the valve to close rapidly.

[0003] Chinese patent application number CN214838626U discloses a check valve with a valve disc slow-closing function, comprising a valve body, a water inlet and a water outlet on either side of the valve body, a valve cover connected to the top of the valve body via a flange, a sealing gasket provided on the valve cover, a fixed valve sleeve fixedly connected to the bottom of the valve cover, a check valve stem provided within the fixed valve sleeve, an internal rod provided within the check valve stem, a magnetic block provided at the bottom end of the internal rod, and a magnetic iron provided at the bottom end of the internal rod. The utility model provides a slow-closing spring. When the check valve stem moves downward, the slow-closing spring, due to its top end being fixed to the top seat of the internal rod, generates a pulling force on the check valve stem. Although this rebound pulling force is less than the pulling force of the check valve disc on the check valve stem, it buffers the descent speed of the check valve disc, further enhancing the slow-closing function of the check valve, eliminating the huge hydraulic force generated by the backflow of the medium at the outlet, and providing good protection for the check valve disc and the pipeline system.

[0004] However, the above technical solution has the following defects: in the above check valve with valve plate slow closing function, the closing speed of the valve disc is reduced by the attraction between the magnetic block and the magnetic iron, but the distance between the magnets cannot be adjusted, and it cannot function when one of them falls. Utility Model Content

[0005] The utility model aims to solve the problems existing in the background technology and proposes a check valve with a valve plate slow closing function.

[0006] The technical solution of the utility model is: a check valve with a valve plate slow closing function, comprising a valve body, a valve cover, a mounting shell, a valve stem, a valve disc, a spring and a partition;

[0007] The valve cover is connected to the upper end of the valve body, the partition is connected to the inner wall of the valve body, the partition is provided with a through hole, the valve stem is slidably connected to the valve cover, the valve disc is connected to the lower end of the valve stem, and the valve disc and the through hole are coaxially distributed;

[0008] The spring sleeve is arranged on the outside of the valve stem, and the spring connects the lower end of the valve cover and the upper end of the valve disc;

[0009] The installation shell is connected to the upper end of the valve cover. There are two extrusion components. The two extrusion components are slidably connected to the installation shell and symmetrically distributed on both sides of the valve stem. The extrusion components press on the outer peripheral surface of the valve stem.

[0010] An adjustment component for adjusting the distance between the two extrusion components is provided inside the installation shell.

[0011] Preferably, the extrusion component includes an installation plate, a fixed block, and a pressing block.

[0012] The installation plate is slidably connected to the installation shell. One end of the pressing block is rotatably connected to the surface of the installation plate. The fixed block is connected to the surface of the installation plate and is located below the pressing block.

[0013] Preferably, the pressing block is of an elastic structure, and the length of the pressing block is greater than the length of the fixed block.

[0014] Preferably, the adjustment component includes a double-threaded rod, a knob, and a guide rod.

[0015] The double-threaded rod is rotatably connected to the installation shell. The guide rod is connected to the inner wall of the installation shell. The guide rod and the double-threaded rod are arranged side by side. The knob is connected to the end of the double-threaded rod.

[0016] The installation plates in the two extrusion components are in threaded fit connection with the double-threaded rod, and the two extrusion components are symmetrically distributed on the double-threaded rod.

[0017] Preferably, the valve flap is frustum-shaped. The outer diameter value of the valve flap gradually decreases in the direction away from the valve stem along the axis direction of the valve stem. The maximum outer diameter value of the valve flap is greater than the inner diameter value of the through hole on the partition plate, and the minimum outer diameter value of the valve flap is less than the inner diameter value of the through hole.

[0018] Preferably, it further includes an installation ring a, bolts, an installation ring b, and nuts.

[0019] The installation ring a is connected to the valve cover and is coaxially distributed with the valve cover. The installation ring b is connected to the valve body and is coaxially distributed with the valve body.

[0020] There are multiple bolts passing through the installation ring a and the installation ring b. There are multiple nuts corresponding to the bolts one by one. The nuts are in threaded fit connection with the corresponding bolts. The ends of the bolts and the nuts clamp the installation ring a and the installation ring b.

[0021] Preferably, a fixed ring is provided on the valve cover. The valve stem is slidably connected to the inner peripheral surface of the fixed ring. Multiple sealing rings are provided on the inner peripheral surface of the fixed ring, and the sealing rings are pressed tightly on the outer peripheral surface of the valve stem.

[0022] Compared with the prior art, the above technical solutions of the present utility model have the following beneficial technical effects:

[0023] 1. In the present utility model, the extrusion component can apply a certain pressure to the valve stem when the valve stem descends, slowing down the descending speed of the valve stem.

[0024] 2. In the present utility model, the adjusting component can adjust the distance of the extrusion component, that is, can adjust the resistance of the valve rod to descend, and further adjust the descending speed of the valve rod, making the check valve more flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. 6 is a perspective view of a check valve with a slow-closing function of the valve plate proposed by the present utility model.

[0026] Figure 2 FIG. 7 is a schematic structural view of a check valve with a slow-closing function of the valve plate proposed by the present utility model.

[0027] Figure 3 FIG. 8 is a sectional view of a check valve with a slow-closing function of the valve plate proposed by the present utility model.

[0028] Figure 4 FIG. Figure 2 is an internal structural view of part A in FIG.

[0029] Reference numerals: 1, valve body; 2, valve cover; 3, mounting shell; 4, valve rod; 5, mounting ring a; 6, bolt; 7, mounting ring b; 8, valve flap; 9, spring; 10, mounting plate; 11, fixing block; 12, double-threaded rod; 13, knob; 14, pressing block; 15, guide rod; 16, partition plate; 17, nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiment 1

[0031] As Figures 1-4 shown, a check valve with a slow-closing function of the valve plate proposed by the present utility model includes a valve body 1, a valve cover 2, a mounting shell 3, a valve rod 4, a valve flap 8, a spring 9 and a partition plate 16;

[0032] The valve cover 2 is connected to the upper end of the valve body 1, the partition plate 16 is connected to the inner wall of the valve body 1, a through hole is provided on the partition plate 16, the valve rod 4 is slidably connected to the valve cover 2, the valve flap 8 is connected to the lower end of the valve rod 4, and the valve flap 8 is coaxially distributed with the through hole;

[0033] Further, a fixing ring is provided on the valve cover 2, the valve rod 4 is slidably connected to the inner peripheral surface of the fixing ring, and a plurality of sealing rings are provided on the inner peripheral surface of the fixing ring, and the sealing rings are pressed against the outer peripheral surface of the valve rod 4;

[0034] Further, the valve flap 8 is frustum-shaped, the outer diameter value of the valve flap 8 gradually decreases in the axial direction of the valve rod 4 away from the valve rod 4, the maximum outer diameter value of the valve flap 8 is greater than the inner diameter value of the through hole on the partition plate 16, and the minimum outer diameter value of the valve flap 8 is less than the inner diameter value of the through hole;

[0035] The spring 9 is sleeved outside the valve rod 4, and the spring 9 is connected to the lower end of the valve cover 2 and the upper end of the valve flap 8;

[0036] The mounting shell 3 is connected to the upper end of the valve cover 2. There are two squeezing components. The two squeezing components are slidably connected to the mounting shell 3 and symmetrically distributed on both sides of the valve stem 4. The squeezing components press on the outer peripheral surface of the valve stem 4.

[0037] The squeezing component includes a mounting plate 10, a fixing block 11 and a pressing block 14.

[0038] The mounting plate 10 is slidably connected to the mounting shell 3. One end of the pressing block 14 is rotatably connected to the surface of the mounting plate 10. The fixing block 11 is connected to the surface of the mounting plate 10. The fixing block 11 is located below the pressing block 14. There is a groove in the fixing block 11, and an elastic member is arranged in the groove. The elastic member is connected to the lower end of the pressing block 14.

[0039] Furthermore, the pressing block 14 is of an elastic structure, and the length of the pressing block 14 is greater than the length of the fixing block 11.

[0040] An adjusting component for adjusting the distance between the two squeezing components is arranged in the mounting shell 3.

[0041] In the present utility model, when the valve flap 8 is extruded upward by the medium, the medium can pass through the through holes on the partition plate 16, the spring 9 is further extruded, the valve stem 4 slides on the valve cover 2. When the valve stem 4 slides upward, one end of the pressing block 14 in the squeezing component is driven to rotate upward, and the squeezing component does not squeeze the valve stem 4 and does not hinder the opening of the valve flap 8; when the valve stem 4 slides downward, it will drive the pressing block 14 to rotate downward, and the surface of the pressing block 14 presses tightly on the fixing block 11. Since the length of the pressing block 14 is greater than the length of the fixing block 11, the pressing block 14 presses tightly on the outer peripheral surface of the valve stem 4, and thus the sliding speed of the valve stem 4 can be slowed down. The frictional force between the pressing block 14 and the valve stem 4 is less than the elastic force of the spring 9, enabling the valve stem 4 to drive the valve flap 8 to move downward.

[0042] Embodiment Two

[0043] As Figures 3-4 shown, a check valve with a function of slowly closing the valve plate proposed by the present utility model. Compared with Embodiment One, in this embodiment, the adjusting component includes a double threaded rod 12, a knob 13 and a guide rod 15.

[0044] The double threaded rod 12 is rotatably connected to the mounting shell 3. The guide rod 15 is connected to the inner wall of the mounting shell 3. The guide rod 15 and the double threaded rod 12 are arranged side by side. The knob 13 is connected to the end of the double threaded rod 12.

[0045] The mounting plates 10 in the two squeezing components are in threaded fit connection with the double threaded rod 12, and the two squeezing components are symmetrically distributed on the double threaded rod 12.

[0046] In this embodiment, the rotation of the rotary knob 13 drives the double threaded rod 12 to rotate. The extrusion assembly is in threaded fit connection with the double threaded rod 12. When the two extrusion assemblies approach each other, the valve stem 4 can be further tightened. When the extrusion assembly moves away from the valve stem 4, the valve stem 4 can be loosened. By adjusting the distance, the force for extruding the valve stem 4 can be adjusted, making the use more flexible.

[0047] Embodiment Three

[0048] As Figures 1-3 shown, a check valve with a slow-closing function of the valve plate proposed by the present utility model. Compared with Embodiment One, this embodiment further includes a mounting ring a 5, bolts 6, a mounting ring b 7, and nuts 17;

[0049] The mounting ring a 5 is connected to the valve cover 2 and is coaxially distributed with the valve cover 2. The mounting ring b 7 is connected to the valve body 1 and is coaxially distributed with the valve body 1;

[0050] There are multiple bolts 6 passing through the mounting ring a 5 and the mounting ring b 7. There are multiple nuts 17 corresponding to the bolts 6 one by one. The nuts 17 are in threaded fit connection with the corresponding bolts 6. The ends of the bolts 6 and the nuts 17 clamp the mounting ring a 5 and the mounting ring b 7.

[0051] In this embodiment, the mounting ring a 5 and the mounting ring b 7 are connected together by the bolts 6 and the nuts 17, further making the installation of the valve cover 2 and the valve body 1 more stable and tight.

[0052] The above has described in detail the embodiments of the present utility model in conjunction with the drawings. However, the present utility model is not limited thereto. Various changes can be made without departing from the spirit of the present utility model within the scope of knowledge of those skilled in the art to which it pertains.

Claims

1. A check valve with a function of slow closing of the valve plate, characterized in that, It includes a valve body (1), a valve cover (2), a mounting shell (3), a valve stem (4), a valve flap (8), a spring (9) and a partition plate (16); The valve cover (2) is connected to the upper end of the valve body (1), the partition plate (16) is connected to the inner wall of the valve body (1), a through hole is provided on the partition plate (16), the valve stem (4) is slidably connected to the valve cover (2), the valve flap (8) is connected to the valve stem (4), and the valve flap (8) is coaxially distributed with the through hole; The spring (9) is sleeved outside the valve stem (4), and the spring (9) is connected to the valve cover (2) and the valve flap (8); The mounting shell (3) is connected to the valve cover (2), there are two pressing components, the two pressing components are slidably connected to the mounting shell (3) and symmetrically distributed on both sides of the valve stem (4), and the pressing components press on the outer peripheral surface of the valve stem (4); A regulating component for adjusting the distance between the two pressing components is provided inside the mounting shell (3).

2. The check valve with a function of slow closing of the valve plate according to claim 1, characterized in that, The pressing component includes a mounting plate (10), a fixing block (11) and a pressing block (14); The mounting plate (10) is slidably connected to the mounting shell (3), one end of the pressing block (14) is rotatably connected to the surface of the mounting plate (10), the fixing block (11) is connected to the surface of the mounting plate (10), and the fixing block (11) is located below the pressing block (14).

3. The check valve with a function of slow closing of the valve plate according to claim 2, characterized in that, The pressing block (14) is of an elastic structure, and the length of the pressing block (14) is greater than the length of the fixing block (11).

4. A check valve with a function of slow closing of a valve plate according to claim 1, characterized in that, The regulating component includes a double threaded rod (12), a knob (13) and a guide rod (15); The double threaded rod (12) is rotatably connected to the mounting shell (3), the guide rod (15) is connected to the inner wall of the mounting shell (3), the guide rod (15) is arranged side by side with the double threaded rod (12), and the knob (13) is connected to the end of the double threaded rod (12); The mounting plates (10) in the two pressing components are in threaded fit connection with the double threaded rod (12), and the two pressing components are symmetrically distributed on the double threaded rod (12).

5. A check valve with a function of slowly closing the valve plate according to claim 1, characterized in that, The valve flap (8) is frustum-shaped, the outer diameter value of the valve flap (8) gradually decreases in the axial direction of the valve stem (4) away from the valve stem (4), the maximum outer diameter value of the valve flap (8) is greater than the inner diameter value of the through hole on the partition plate (16), and the minimum outer diameter value of the valve flap (8) is less than the inner diameter value of the through hole.

6. A check valve with a function of slowly closing a valve plate according to claim 1, characterized in that, It also includes a mounting ring a (5), bolts (6), a mounting ring b (7) and nuts (17); The mounting ring a (5) is connected to the valve cover (2) and is coaxially distributed with the valve cover (2), and the mounting ring b (7) is connected to the valve body (1) and is coaxially distributed with the valve body (1); There are multiple bolts (6) passing through the mounting ring a (5) and the mounting ring b (7), there are multiple nuts (17) corresponding to the bolts (6) one by one, the nuts (17) are in threaded fit connection with the corresponding bolts (6), and the ends of the bolts (6) and the nuts (17) clamp the mounting ring a (5) and the mounting ring b (7).

7. A check valve with a slow-closing function of a valve plate according to claim 1, characterized in that, A fixing ring is provided on the valve cover (2), the valve stem (4) is slidably connected to the inner peripheral surface of the fixing ring, and multiple sealing rings are provided on the inner peripheral surface of the fixing ring, and the sealing rings are pressed tightly on the outer peripheral surface of the valve stem (4).

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