Micro-resistance slow-closing silencing check valve

Abstract

The utility model discloses a micro-resistance slow-closing noise elimination check valve, and belongs to the technical field of valves. The micro-resistance slow-closing noise elimination check valve comprises a valve body, a cavity is formed in the valve body, a valve seat and a valve clack are arranged in the cavity, and the valve clack moves towards or away from the valve seat; a micro-damping device is arranged at an inlet of the valve body to buffer the valve clack; the damping length of the micro damping device is 1%-10% of the closing stroke of the valve clack. The micro-damping device is arranged to buffer the valve clack in the closing path of the valve clack, and the damping length of the micro-damping device is 1%-10% of the closing stroke of the valve clack, so that micro-damping micro-slow closing of the valve is realized on the basis that the check valve is close to zero flow speed and quick closing of the valve, and a micro and reverse valve closing water hammer is generated; the peak value of the positive water hammer after the pump stopping water hammer is overlapped with the valve closing water hammer is reduced, the valley value of the first-phase negative water hammer after pump stopping is increased, and the peak value of the positive water hammer of the first-phase negative water hammer reflected wave after pump stopping is indirectly reduced or at least not increased.

Description

Technical Field

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

[0002] A check valve is an automatic valve that controls the one-way flow of a medium. It is widely used in water pump pressurized pipeline systems. It is usually used as a check valve after the pump to prevent the medium from flowing back after the pump is stopped and to isolate the pressure wave in time.

[0003] The existing slow-closing axial flow check valve uses the large damping of the hydraulic cylinder to slow-close the valve. The usual slow-closing degree of the valve closing reaches 20% to 30% or even 40% of the total stroke, that is, first close 75% quickly and then close 25% slowly, and the slow-closing time is as long as 5 to 120 seconds. The ratio of the slow-closing to the fast-closing amplitude reaches a level of 28, and the purpose of the slow-closing is to release water and reduce pressure (for the reflected wave of the pump stop water hammer-positive water hammer peak). However, the large slow-closing degree reserved in advance guides / encourages and may even aggravate the backflow of the water column. After closing the valve, it is inevitable to generate its own valve closing water hammer, thus creating a second water hammer source in addition to the pump stop water hammer, resulting in large water loss, valve disc vibration, inability to achieve two-stage valve closing, and valve closing water hammer. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] In view of the shortcomings of existing check valves, such as large water loss, valve flap vibration, inability to achieve two-stage valve closing, and valve closing water hammer, the utility model provides a micro-resistance slow-closing silencer check valve to solve the above problems.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0008] The utility model discloses a micro-resistance slow-closing silencer check valve, comprising a valve body, wherein a cavity is formed inside the valve body, a valve seat and a valve flap are arranged in the cavity, and the valve flap can move toward or away from the valve seat;

[0009] As a further improvement of the utility model, a micro-damping device is provided at the inlet of the valve body for cushioning the valve disc in the final stage of valve closing; the damping length of the micro-damping device is 1% to 10% of the valve disc closing stroke.

[0010] As a further improvement of the utility model, the valve flap includes a flap body, a first slide rod is arranged on the flap body, the first slide rod passes through the valve seat and is movably connected to the valve seat, and the flap body moves toward or away from the valve seat along with the first slide rod.

[0011] As a further improvement of the utility model, the micro-damping device is arranged opposite to the first slide bar; when the valve body reaches 1% to 10% of the return stroke, the micro-damping device contacts the first slide bar.

[0012] As a further improvement of the utility model, a spring shaft is arranged on the side of the flap body away from the valve seat, an elastic member is sleeved on the spring shaft, one end of the elastic member abuts against the flap body, and the other end abuts against the valve body.

[0013] As a further improvement of the utility model, the valve body includes an outlet section, an intermediate section and an inlet section, a valve body bottom plate is provided at the outlet section, a valve body through hole is opened on the valve body bottom plate; one end of the elastic member abuts against the flap body, and the other end abuts against the valve body bottom plate.

[0014] As a further improvement of the utility model, a second sliding rod is arranged at the end of the spring shaft, and the second sliding rod passes through the through hole of the valve body and is movably connected to the bottom plate of the valve body.

[0015] As a further improvement of the utility model, a mounting seat is arranged at the inlet section, and the mounting seat comprises a damping seat arranged on the axis of the valve body, and the damping seat is connected to the valve body through a plurality of support rods; the micro damping device is installed in the damping seat.

[0016] As a further improvement of the utility model, the micro-damping device includes a cylinder body, a piston is arranged inside the cylinder body, a damping spring is sleeved on one end of the piston, the damping spring abuts against the cylinder body, and the other end of the piston extends out of the cylinder body.

[0017] As a further improvement of the utility model, the cylinder body is connected to a cylinder cover, a through hole is provided on the cylinder cover, and the piston passes through the cylinder cover through the through hole.

[0018] As a further improvement of the utility model, a liquid inlet hole is provided on the cylinder cover; a convex ring is provided on the middle part of the piston protruding outward, and the convex ring contacts the side wall of the cylinder body; a throttling hole is provided on the convex ring and passes through the convex ring.

[0019] 3. Beneficial effects

[0020] Compared with the existing known technologies, the technical solution provided by the utility model has the following significant effects:

[0021] (1) The utility model is a micro-resistance slow closing silencer check valve, in which a micro-damping device is arranged at the inlet of the valve body to cushion the valve disc in the path of valve disc closing. The damping length of the micro-damping device is 1% to 10% of the valve disc closing stroke, so that the check valve can achieve micro-damping micro-slow closing valve on the basis of rapid valve closing at a flow rate close to zero, and only produces a small and reverse valve closing water hammer, which not only reduces the positive water hammer peak value after the pump stopping water hammer superimposed on the valve closing water hammer, but also raises the trough value of the first negative water hammer after the pump stopping, thereby indirectly reducing or at least not increasing the positive water hammer peak value of the negative water hammer reflection wave at the first stage of pump stopping.

[0022] (2) The utility model is a micro-resistance slow-closing silencer check valve. Based on the existing quick-closing silencer check valve, in the last 1% to 10% of the tiny stroke of closing the valve, a micro-resistance slow-closing valve with micro-damping and micro-slow closing is realized, which successfully reduces its own valve closing water hammer, simplifies the transient working conditions of pump stopping water hammer, and has a simple and reliable structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the fully open state of the check valve of the utility model;

[0024] Figure 2 This is a schematic diagram of the slow-closing state of the check valve of the utility model;

[0025] Figure 3 This is a schematic diagram of the fully open state of the check valve of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the micro damping device of the utility model.

[0027] Explanation of the numbers in the schematic diagram:

[0028] 1. Valve body; 11. Outlet section; 12. Middle section; 13. Inlet section; 14. Valve body bottom plate; 15. Valve body through hole; 16. Flange;

[0029] 2. Valve seat; 21. Valve shaft bracket; 22. Ring seat; 23. Valve seat through hole;

[0030] 3. Mounting seat; 31. Support rod; 32. Damping seat;

[0031] 4. Micro damping device; 41. Cylinder body; 42. Damping spring; 43. Piston; 44. Fixing screw; 45. Cylinder cover; 46. Liquid inlet hole; 47. Throttle hole; 48. Connecting screw;

[0032] 5. Valve disc; 51. Valve body; 52. First slide bar; 53. Spring shaft; 54. Second slide bar;

[0033] 6. Elastic parts. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] Example

[0041] Combination Figure 1-Figure 4 In this embodiment, a micro-resistance slow closing silencer check valve is provided with a micro-damping device 4 at the inlet of the valve body 1. In the path of the valve flap 5 closing, the valve flap 5 is buffered. The damping length of the micro-damping device 4 is 1% to 10% of the closing stroke of the valve flap 5, so that the check valve can realize a micro-damping slow closing valve on the basis of fast closing of the valve at a flow rate close to zero, and only produces a small and reverse valve closing water hammer, which not only reduces the positive water hammer peak value after the pump stopping water hammer superimposed on the valve closing water hammer, but also raises the trough value of the first negative water hammer after the pump stopping, thereby indirectly reducing or at least not increasing the positive water hammer peak value of the first negative water hammer reflection wave of the pump stopping. Among them, the damping length is: the distance that the valve flap 5 moves to the valve seat 2 after the first sliding rod 52 contacts the micro-damping device 4; that is, the last slow closing stroke of the valve flap 5.

[0042] The specific structure is described as follows:

[0043] A micro-resistance slow-closing silencer check valve in this embodiment includes a valve body 1. The valve body 1 is roughly a columnar structure with openings at both ends. A cavity is formed inside the valve body 1, and a valve seat 2 and a valve flap 5 are arranged in the cavity, wherein the valve seat 2 is fixed in the cavity, and the valve flap 5 moves in the cavity along the central axis of the valve body 1. When the valve flap 5 moves away from the valve seat 2, the check valve opens; when the valve flap 5 moves toward the valve seat 2, the check valve slowly closes, and when the valve flap 5 contacts the valve seat 2, the check valve is completely closed.

[0044] In this embodiment, the valve body 1 is divided into three parts, namely, the outlet section 11, the middle section 12 and the inlet section 13. Figure 1For example, the outlet section 11, the middle section 12 and the inlet section 13 are connected in sequence from right to left. Among them, the inner diameters of the outlet section 11 and the inlet section 13 are basically the same, the inner diameter of the middle section 12 is larger than that of the outlet section 11 and the inlet section 13, and a slope transition is set between the middle section 12 and the outlet section 11. A circle of flanges 16 are extended outward at both ends of the valve body 1, which is convenient for fixing the valve body 1 at different positions. A valve body bottom plate 14 is provided at the opening of the outlet section 11, and the valve body bottom plate 14 improves the structural strength of the valve body 1. In this embodiment, the valve body bottom plate 14 is a hub-shaped structure that allows liquid to pass through. A valve body through hole 15 is opened in the center of the valve body bottom plate 14, and the valve body through hole 15 passes through the valve body bottom plate 14. At the same time, the liquid inside the valve body 1 can pass through the valve body bottom plate 14 and flow into the outside.

[0045] In this embodiment, a micro-damping device 4 is provided at the inlet of the valve body 1 to buffer the valve flap 5; the damping length of the micro-damping device 4 is 1% to 10% of the closing stroke of the valve flap 5. Specifically, a mounting seat 3 for mounting the micro-damping device 4 is provided at the inlet section 13 of the valve body 1, and the mounting seat 3 includes a damping seat 32 provided on the axis of the valve body 1, and the damping seat 32 is connected to the valve body 1 through a plurality of support rods 31; the micro-damping device 4 is installed in the damping seat 32. In this embodiment, a total of three support rods 31 are provided, which are arranged equidistantly along the circumference of the damping seat 32, so that the damping seat 32 can be fixed more stably.

[0046] In this embodiment, the valve seat 2 is fixedly connected to the inner wall of the valve body 1, and the valve seat 2 includes a valve shaft support 21 and an annular seat 22, wherein the annular seat 22 is tightly fitted with the inner wall of the valve body 1. The annular seat 22 is provided with the valve shaft support 21, and a valve seat through hole 23 is provided in the middle of the valve shaft support 21.

[0047] In this embodiment, the valve flap 5 includes a flap body 51, and a first slide rod 52 is arranged on one side of the flap body 51. The first slide rod 52 passes through the valve seat 2 and is movably connected to the valve seat 2. The flap body 51 moves toward or away from the valve seat 2 along with the first slide rod 52. When the flap body 51 contacts the annular seat 22, the check valve is closed. A spring shaft 53 is arranged on the side of the flap body 51 away from the valve seat 2, and an elastic member 6 is sleeved on the spring shaft 53. One end of the elastic member 6 abuts against the flap body 51, and the other end abuts against the valve body bottom plate 14 of the valve body 1. A second slide rod 54 is arranged at the end of the spring shaft 53, and the second slide rod 54 passes through the valve body through hole 15 and is movably connected to the valve body bottom plate 14. The elastic member 6 in this embodiment is a spring. In this embodiment, the valve flap 5 is supported on both sides of the first slide bar 52 and the second slide bar 54 in the valve body 1, so as to stably support the valve flap 5. Meanwhile, through holes are provided on the valve seat 2 and the valve body bottom plate 14, so as to enable the valve flap 5 to move smoothly and reduce the influence of friction.

[0048] In this embodiment, the micro damping device 4 is arranged opposite to the first slide bar 52; when the flap 51 approaches the valve seat 2 (i.e., when the flap 51 reaches 1% to 10% of the return stroke), the micro damping device 4 contacts the first slide bar 52 and applies a reverse force to the first slide bar 52, thereby achieving a buffering effect. Figure 4 The micro damping device 4 of this embodiment includes a cylinder body 41, which is a structure with one end open. A piston 43 is arranged inside the cylinder body 41. A damping spring 42 is sleeved on one end of the piston 43. The damping spring 42 abuts against the cylinder body 41, and the other end of the piston 43 extends out of the cylinder body 41. The cylinder body 41 is connected to a cylinder cover 45 by a fixing screw 44. A through hole is provided on the cylinder cover 45. The piston 43 passes through the cylinder cover 45 through the through hole. A liquid inlet hole 46 is provided on the cylinder cover 45. In this embodiment, the piston 43 is a cylinder, and a convex ring is provided in the middle part protruding outward. The convex ring contacts the side wall of the cylinder body 41; a throttle hole 47 is provided on the convex ring to penetrate the convex ring. In this embodiment, the liquid inlet hole 46 allows the liquid in the valve body 1 to enter the inner cavity of the cylinder body 41, and also allows the liquid to be discharged from the cylinder body 41. During the movement of the piston 43, the inner cavity volume of the cylinder body 41 on both sides of the piston 43 will change, so that the liquid will flow from one side of the piston 43 to the other side through the throttle hole 47. Since the throttle hole 47 has a small aperture, the efficiency of the liquid passing through the throttle hole 47 is low and the time is long, thereby achieving a damping effect. In this embodiment, the micro damping device 4 is fixed to the mounting seat 3 by connecting screws 48.

[0049] Combination Figure 1-Figure 3 The check valve of this embodiment has three states:

[0050] (1) Valve closing status:

[0051] like Figure 3 As shown, under the action of back pressure, the valve is in a fully closed state, and the elastic member 6 is in an initial compression state. At this time, the elastic force of the elastic member 6 is at a minimum value, the valve is closed, and no medium flows.

[0052] (2) Fully open

[0053] like Figure 1 As shown, the valve is pushed by the fluid, overcoming the elastic force of the elastic member 6, and the valve flap 5 gradually opens; at this time, the elastic member 6 is in the maximum compression state, and the valve is in the full-diameter open state.

[0054] (3) Slow closing start state

[0055] like Figure 2As shown, after stopping the pump, when the fluid flow rate / flow velocity in the pipeline decreases, the fluid thrust acting on the valve flap 5 also gradually decreases and tends to zero. When the elastic force of the elastic member 6 exceeds the thrust of the water flow, the valve flap 5 closes quickly under the action of the elastic force. When the first slide rod 52 contacts the piston 43 of the micro-damping device 4, the micro-damping device 4, under the action of the damping spring 42 and the internal medium, gives the valve flap 5 a force opposite to the valve closing force, thereby reducing the valve closing speed of the valve flap 5 and achieving a slow closing function.

[0056] In this embodiment, an axial micro-damping device 4 is arranged at the front of the valve body 1, and its damping length is only 1-10% of the full stroke, and the slow closing time is only 1-6s, which can realize the micro-damping slow closing of the last stroke of the check valve disc 5. Compared with the conventional 20-40% long slow closing stroke and 5-120s long slow closing duration, it is one order of magnitude or more different.

[0057] The micro-slow closing described in this embodiment refers to a relatively small slow closing force and a relatively small slow closing stroke. The micro-damping device 4 is fixed in the valve body 1, so that the moving closing member begins to contact the piston 43 of the micro-damping device 4 at the last moment of closing (1 to 10% of the total stroke). Under the damping effect of the spring force of the micro-damping device 4 and the fluid, resistance is provided to the moving valve flap 5, so that the valve flap 5 slows down the valve closing speed and the valve closing time becomes longer; when the external force (the thrust of the valve flap 5 to the piston 43) is released, the micro-damping device 4 is slowly reset under the drive of the damping spring 42 and is in the waiting position. This embodiment can be used after a pressurized pipeline water pump and in places where backflow must be prevented and pressure waves must be cut off, or in water supply, water pipelines and oil and gas pipelines.

[0058] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A micro-resistance slow-closing silencer check valve, comprising a valve body (1), wherein a cavity is formed inside the valve body (1), a valve seat (2) and a valve flap (5) are arranged in the cavity, and the valve flap (5) can move toward or away from the valve seat (2); It is characterized in that A micro damping device (4) is provided at the inlet of the valve body (1) for cushioning the valve flap (5) in the final stage of valve closing; the damping length of the micro damping device (4) is 1% to 10% of the closing stroke of the valve flap (5).

2. A micro-resistance slow closing silencer check valve according to claim 1, characterized in that: The valve flap (5) comprises a flap body (51), a first slide rod (52) is arranged on the flap body (51), the first slide rod (52) passes through the valve seat (2) and is movably connected to the valve seat (2), and the flap body (51) moves toward or away from the valve seat (2) along with the first slide rod (52).

3. A micro-resistance slow closing silencer check valve according to claim 2, characterized in that: The micro damping device (4) is arranged opposite to the first slide bar (52); when the flap body (51) reaches 1% to 10% of the return stroke, the micro damping device (4) contacts the first slide bar (52).

4. A micro-resistance slow closing silencer check valve according to claim 2, characterized in that: A spring shaft (53) is arranged on the side of the flap body (51) away from the valve seat (2), and an elastic member (6) is sleeved on the spring shaft (53). One end of the elastic member (6) abuts against the flap body (51), and the other end abuts against the valve body (1).

5. A micro-resistance slow closing silencer check valve according to claim 4, characterized in that: The valve body (1) comprises an outlet section (11), an intermediate section (12) and an inlet section (13); a valve body bottom plate (14) is provided at the outlet section (11), and a valve body through hole (15) is provided on the valve body bottom plate (14); one end of the elastic member (6) abuts against the valve body (51), and the other end abuts against the valve body bottom plate (14).

6. A micro-resistance slow-closing silencer check valve according to claim 5, characterized in that: A second sliding rod (54) is arranged at the end of the spring shaft (53); the second sliding rod (54) passes through the valve body through hole (15) and is movably connected to the valve body bottom plate (14).

7. A micro-resistance slow closing silencer check valve according to claim 5, characterized in that: A mounting seat (3) is arranged at the inlet section (13), and the mounting seat (3) comprises a damping seat (32) arranged on the axis of the valve body (1), and the damping seat (32) is connected to the valve body (1) via a plurality of support rods (31); the micro damping device (4) is installed in the damping seat (32).

8. A micro-resistance slow-closing silencer check valve according to any one of claims 1 to 7, characterized in that: The micro damping device (4) comprises a cylinder (41), a piston (43) is arranged inside the cylinder (41), a damping spring (42) is sleeved on one end of the piston (43), the damping spring (42) is in contact with the cylinder (41), and the other end of the piston (43) extends out of the cylinder (41).

9. A micro-resistance slow closing silencer check valve according to claim 8, characterized in that: The cylinder body (41) is connected to a cylinder cover (45), a through hole is provided on the cylinder cover (45), and the piston (43) passes through the cylinder cover (45) through the through hole.

10. A micro-resistance slow-closing silencer check valve according to claim 9, characterized in that: The cylinder cover (45) is provided with a liquid inlet hole (46) extending therethrough; a convex ring is provided protruding outward from the middle of the piston (43), and the convex ring contacts the side wall of the cylinder body (41); and a throttle hole (47) extending therethrough is provided on the convex ring.

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