Slow-closing type check valve

Abstract

The utility model relates to the related field of check valves, in particular to a slow closing type check valve which comprises a check valve body, a valve clack, a valve rod, a mounting flange, a valve cover, a fixing cylinder, an expansion groove, a convex block, a slow closing spring, a sliding groove, a trapezoidal sliding block, slow closing rubber, an adjusting bolt and the like. According to the utility model, the slow-closing spring and the slow-closing rubber are arranged, when the valve clack drives the valve rod to move downwards to reset, the slow-closing spring can generate rebound tension on the valve clack, and the moving speed of the valve clack is further slowed down through the inclined slow-closing rubber, so that the slow closing of the valve clack is realized; the slow closing of the valve clack is favorable for reducing the impact force with the check valve body, reducing the noise generated when the valve plate is closed and reducing the noise pollution, and the abrasion of the valve clack and the check valve body is smaller by reducing the impact force of the valve clack and the check valve body, so that the service life of the check valve can be effectively prolonged.

Description

Technical Field

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

[0002] A check valve is a valve whose opening and closing part is a circular valve disc and which relies on its own weight and medium pressure to produce a movement to block the backflow of the medium. It is an automatic valve and is also called a non-return valve, one-way valve, reflux valve or isolation valve. A check valve is often installed at the outlet of a water pump in a water supply and drainage pipeline to prevent water from flowing back when the water pump stops running.

[0003] When the medium flow in the check valve changes, its valve disc usually closes instantly. The collision of the quickly closed valve disc and the valve seat will produce a large noise, forming noise pollution. If the check valve is used frequently, its valve disc will frequently collide with the valve body, which can easily cause wear of the valve disc or valve body, thereby affecting the service life of the check valve. Summary of the invention

[0004] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a slow-closing check valve to solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a slow-closing check valve, comprising a check valve body, a valve disc arranged in the check valve body, and a valve stem installed in the middle of the top end surface of the valve disc, a valve cover is fixedly installed on the top end surface of the check valve body, a convex block is arranged on the top of the valve stem, and a fixing cylinder movably extended into the check valve body is installed on the bottom end surface of the valve cover;

[0006] The inner bottom of the fixed cylinder is movably connected to the valve stem, and the inner top of the fixed cylinder expands outward to form an expansion groove;

[0007] A sliding groove is provided at the inner bottom of the expansion groove;

[0008] The outer diameter of the protrusion is larger than the outer diameter of the valve stem, the protrusion is movably connected to the inner side of the expansion groove, and the protrusion is connected to the bottom end surface of the valve cover through a slow-closing spring;

[0009] A trapezoidal slider is slidably installed in the slide groove, and the end of the trapezoidal slider facing the protrusion is an inclined surface. The outer surface of the trapezoidal slider is pasted with a slow-closing rubber that is tightly attached to the side surface of the protrusion, and an adjusting bolt is rotatably installed on the end of the trapezoidal slider away from the slow-closing rubber. The adjusting bolt cooperates with the inner circle thread of the screw hole opened on the side surface of the fixed cylinder.

[0010] Preferably, a mounting flange is provided at each of the left and right ends of the check valve body.

[0011] Preferably, the slow-closing rubber is arranged obliquely and parallel to the outer surface of the trapezoidal slider, and the slow-closing rubber is flush with the upper and lower end surfaces of the trapezoidal slider.

[0012] Preferably, a group of slide grooves, trapezoidal sliders, slow-closing rubbers and adjusting bolts are respectively provided on the left and right sides of the fixing cylinder.

[0013] Preferably, the outer bottom of the protrusion is provided with a rounded corner.

[0014] Preferably, the adjusting bolt is a T-shaped structure, and a distance is provided between the adjusting bolt and the inner wall of the check valve body.

[0015] Preferably, the sum of the rebound tension of the slow-closing spring and the elastic force of the slow-closing rubber is smaller than the tension of the valve disc on the valve stem.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a slow-closing spring and a slow-closing rubber. When the valve disc drives the valve stem to move downward and reset, the slow-closing spring will generate a rebound pulling force on the valve disc, and the slow-closing rubber set at an angle will further slow down the speed of the valve disc movement to achieve slow closing of the valve disc. The slow closing of the valve disc is beneficial to reducing the impact force with the check valve body, reducing the noise generated when the valve plate is closed, and helping to reduce noise pollution. Reducing the impact force between the valve disc and the check valve body can also reduce the wear of the valve disc and the check valve body, which can effectively increase the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the connection structure of the valve disc in the closed state of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the check valve of the utility model from a top view;

[0020] Figure 3 The utility model Figure 1 A schematic diagram of the enlarged structure in the middle.

[0021] Among them: check valve body-1, valve disc-2, valve stem-3, mounting flange-4, valve cover-5, fixing cylinder-6, expansion groove-7, bump-8, slow closing spring-9, slide groove-10, trapezoidal slider-11, slow closing rubber-12, adjusting bolt-13. DETAILED DESCRIPTION

[0022] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0023] like Figure 1 and Figure 2 As shown, the utility model provides a slow-closing check valve, comprising a check valve body 1, a valve disc 2 arranged in the check valve body 1, a valve stem 3 vertically installed in the middle of the top end surface of the valve disc 2, and a valve cover 5 is locked and fixed on the top end surface of the check valve body 1;

[0024] In this embodiment, a mounting flange 4 is provided at each of the left and right ends of the check valve body 1, so that the check valve body 1 can be connected to external equipment and pipelines through the flange 4;

[0025] When in use, the check valve is installed in the pipeline system through the flange 4. When medium flows in the check valve body 1, the medium pushes the valve disc 2 to move upward to open the check valve. At this time, the medium can flow through the check valve body 1. When the flow direction of the medium is reversed, the valve disc 2 moves downward and resets under the action of the reverse pressure of the medium and its own gravity, so that the check valve is automatically closed to prevent the fluid from flowing back, thereby realizing one-way flow control.

[0026] like Figures 1 to 3 As shown, in this embodiment, a protrusion 8 is provided on the top of the valve stem 3, and a fixing cylinder 6 movably extending into the check valve body 1 is vertically locked and fixed on the bottom end surface of the valve cover 5;

[0027] The inner bottom of the fixed cylinder 6 is movably connected to the valve stem 3, and the fixed cylinder 6 provides positioning for the valve stem 3, thereby improving the stability of the valve stem 3 during vertical movement, and the inner top of the fixed cylinder 6 expands outward to form an expansion groove 7;

[0028] A slide groove 10 is vertically opened at the inner bottom of the expansion groove 7;

[0029] The outer diameter of the protrusion 8 is larger than the outer diameter of the valve stem 3, and the protrusion 8 is movably connected to the inner side of the expansion groove 7. The protrusion 8 can move vertically up and down inside the expansion groove 7. The protrusion 8 is connected to the bottom end surface of the valve cover 5 through the slow-closing spring 9, so that the protrusion 8 cooperates with the slow-closing spring 9 to slow down the speed at which the valve disc 2 moves downward;

[0030] A trapezoidal slider 11 is slidably installed in the slide groove 10, and the end of the trapezoidal slider 11 facing the protrusion 8 is an inclined surface. The outer surface of the trapezoidal slider 11 is pasted with a slow-closing rubber 12 that is close to the side surface of the protrusion 8, so that the speed of the protrusion 8 moving downward can be further slowed down by the slow-closing rubber 12, thereby slowing down the speed of the valve flap 2 moving downward and resetting. An adjusting bolt 13 is rotatably installed on the end of the trapezoidal slider 11 away from the slow-closing rubber 12. The adjusting bolt 13 cooperates with the inner circle thread of the screw hole opened on the side surface of the fixing cylinder 6, so that the position of the slow-closing rubber 12 can be adjusted by the adjusting bolt 13, so as to adjust the elastic force of the slow-closing rubber 12 that needs to be overcome when the protrusion 8 moves downward, thereby improving the flexibility of the slow-closing rubber 12 during use.

[0031] The slow-closing rubber 12 is inclined and parallel to the outer surface of the trapezoidal slider 11. The slow-closing rubber 12 is flush with the upper and lower end surfaces of the trapezoidal slider 11, so that the speed of the downward movement of the protrusion 8 can be stably slowed down by the inclined slow-closing rubber 12.

[0032] Among them, a group of slide grooves 10, trapezoidal sliders 11, slow-closing rubbers 12 and adjusting bolts 13 are respectively arranged on the left and right sides of the fixed cylinder 6, so as to stably slow down the speed of the downward movement of the protrusion 8;

[0033] In this embodiment, the outer bottom of the protrusion 8 is provided with a rounded corner to prevent the corners of the protrusion 8 from being too sharp and causing damage to the slow-closing rubber 12;

[0034] In this embodiment, the adjusting bolt 13 is a T-shaped structure, and a distance is set between the adjusting bolt 13 and the inner wall of the check valve body 1, so as to facilitate the rotation of the adjusting bolt 13 and adjust the position of the slow-closing rubber 12;

[0035] In this embodiment, the sum of the rebound tension of the slow closing spring 9 and the elastic force of the slow closing rubber 12 is smaller than the pulling force of the valve disc 2 on the valve stem 3. The valve disc 2 can overcome the rebound tension of the slow closing spring 9 and the elastic force of the slow closing rubber 12 to reset, thereby closing the check valve.

[0036] When in use, when the valve disc 2 moves downward to reset, it drives the valve stem 3 and the protrusion 8 to move downward to reset, the slow-closing spring 9 will generate a rebound tension on the protrusion 8, and the protrusion 8 needs to overcome the elastic force of the slow-closing rubber 1 when it continues to move downward after moving downward and contacting the slow-closing rubber 12. The inclined slow-closing rubber 1 is used to slow down the speed of the protrusion 8 moving downward, thereby reducing the speed of the valve disc 2 moving downward. Although the sum of the rebound tension of the slow-closing spring 9 and the elastic force of the slow-closing rubber 12 is less than the tension of the valve disc 2 on the valve stem 3, the slow-closing spring 9 and the slow-closing rubber 12 reduce the speed of the valve disc 2 moving downward, realizing the slow closing of the valve disc 2, which is beneficial to provide protection for the valve disc 2 and the check valve body 1;

[0037] When in use, the initial state of the slow-closing rubber 12 can be adjusted according to the actual use of the check valve. The valve cover 5 can be removed by removing the bolts connecting the valve cover 5 to the check valve body 1. The initial position of the trapezoidal slider 11 can be driven by rotating the adjusting bolt 13, and the trapezoidal block 11 drives the slow-closing rubber 12 to move horizontally, thereby adjusting the elastic force of the slow-closing rubber 12 that needs to be overcome for the protrusion 8 to move downward, thereby improving the flexibility of the slow-closing rubber 12 during use. When the slow-closing rubber 12 is excessively worn, the position of the slow-closing rubber 12 can also be adjusted by adjusting the bolt 13, so that the slow-closing rubber 12 can continuously slow down the speed at which the protrusion 8 moves downward. After the adjustment is completed, the valve cover 5 can be driven by the valve disc 2 to be installed and continued to be used, which is conducive to the longer use of the slow-closing rubber 12.

[0038] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A slow-closing check valve, comprising a check valve body, a valve disc arranged in the check valve body, a valve stem installed in the middle of the top end surface of the valve disc, and a valve cover fixedly mounted on the top end surface of the check valve body; It is characterized in that The top of the valve stem is provided with a convex block, and the bottom end surface of the valve cover is provided with a fixing cylinder that movably extends into the check valve body; The inner bottom of the fixed cylinder is movably connected to the valve stem, and the inner top of the fixed cylinder expands outward to form an expansion groove; A sliding groove is provided at the inner bottom of the expansion groove; The outer diameter of the protrusion is larger than the outer diameter of the valve stem, the protrusion is movably connected to the inner side of the expansion groove, and the protrusion is connected to the bottom end surface of the valve cover through a slow-closing spring; A trapezoidal slider is slidably installed in the slide groove, and the end of the trapezoidal slider facing the protrusion is an inclined surface. The outer surface of the trapezoidal slider is pasted with a slow-closing rubber that is tightly attached to the side surface of the protrusion, and an adjusting bolt is rotatably installed on the end of the trapezoidal slider away from the slow-closing rubber. The adjusting bolt cooperates with the inner circle thread of the screw hole opened on the side surface of the fixed cylinder.

2. A slow closing check valve according to claim 1, characterized in that: A mounting flange is respectively arranged at the left and right ends of the check valve body.

3. A slow closing check valve according to claim 1, characterized in that: The slow-closing rubber is arranged obliquely and is parallel to the outer surface of the trapezoidal slider, and the slow-closing rubber is flush with the upper and lower end surfaces of the trapezoidal slider.

4. A slow closing check valve according to claim 1, characterized in that: A group of sliding grooves, trapezoidal sliding blocks, slow-closing rubbers and adjusting bolts are respectively arranged on the left and right sides of the fixing cylinder.

5. The slow closing check valve according to claim 1, characterized in that: The outer bottom of the protrusion is provided with a rounded corner.

6. A slow closing check valve according to claim 1, characterized in that: The adjusting bolt is of T-shaped structure, and a distance is arranged between the adjusting bolt and the inner wall of the check valve body.

7. A slow closing check valve according to claim 1, characterized in that: The sum of the rebound tension of the slow-closing spring and the elastic force of the slow-closing rubber is smaller than the tension of the valve disc on the valve stem.

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