CN101832396A - Low-vibration noise valve - Google Patents

Abstract

The invention provides a valve with low vibration and noise. It includes a valve body, a bonnet set on the valve body, a valve seat and a valve core located in the valve body, a valve disc located in the valve core, and a valve stem connected to the valve disc; the valve body has fluid inlets and outlets; There are many small flow channels on the valve core; the valve body and the pipeline are at a 45° inclination angle, that is, the axis direction of the valve body, that is, the valve stem and the fluid inlet and outlet directions form a 45° angle. The invention has the characteristics of low noise, low vibration, easy assembly and small size, can effectively improve the safety, reliability and service life of valves in high-pressure pipeline systems, and save operating and maintenance costs.

Description

Low vibration and noise valve

technical field

The present invention relates to a valve device.

Background technique

As a limit switch device for fluids, valves play an important role in various power equipment systems and process piping systems. Generally, the valve is composed of valve body, valve cover, valve seat, valve core, opening and closing parts, driving parts, seals, fasteners and so on. Due to the throttling effect and non-streamlined structure of the valve, commonly used valves will generate fluid turbulence and mixing inside it, and then generate strong noise. When the valve noise arouses the structural mode of the valve body or the auxiliary pipeline, it may also cause vibration of the valve or pipeline, and even cause fatigue damage in severe cases.

Contents of the invention

The object of the present invention is to provide a low-vibration-noise valve which can not only reduce the noise of the valve, but also suppress the vibration of the valve and the pipeline.

The object of the present invention is achieved as follows: it includes a valve body, a valve cover arranged on the valve body, a valve seat and a valve core located in the valve body, a valve disc located in the valve core, and a valve stem connected with the valve disc; There are fluid inlets and outlets on the body; there are many small flow channels on the valve core; the valve body and the pipeline are at a 45° inclination angle, that is, the axis direction of the valve body, that is, the valve stem and the fluid inlet and outlet directions form a 45° angle.

The present invention may also include:

1. The valve core is composed of two-stage concentric cylindrical throttling parts consisting of an inner valve sleeve and an outer valve sleeve. There are many small flow channels on the inner valve sleeve and the outer valve sleeve; many small flow channels on the inner valve sleeve The area of the first-stage throttling flow channel formed by the flow channel is slightly larger than the flow area of the pipeline; the area of the second-stage throttling flow channel formed by the many small flow channels on the outer valve sleeve is 1.5-2 times the flow area of the pipeline.

2. Many small flow channels on the inner valve sleeve are long holes distributed in the circumferential direction, and V-shaped notches are cut on the edge of the holes.

3. The spacing of the strip holes is more than eight times the width of the strip.

4. The many small flow channels on the outer valve sleeve are small holes of 1.5mm-2.5mm evenly distributed on the wall surface of the outer valve sleeve, and the edges of the holes are cut with V-shaped notches.

5. The hole spacing is more than eight times the diameter of the orifice.

6. A metal rubber gasket is arranged on the upper and lower sides of the valve core, and the inner valve sleeve and the outer valve sleeve are embedded in the grooves on the metal rubber gasket.

In order to reduce the hydrodynamic noise of commonly used ordinary valves, avoid excessive noise radiation from the valve to the outside and downstream pipelines, and avoid fatigue damage caused by acoustic-solid coupling, this invention proposes a low-vibration-noise valve, which can not only reduce valve noise , and can suppress the vibration of valves and pipelines.

The technical solution of the present invention to solve the technical problem is: the shape is basically the same as that of ordinary valves, but the axis of the moving part is not perpendicular to the fluid pipeline, but is at an angle of 45° to the direction of fluid flow, so that the plane of the valve seat faces the fluid as much as possible. flow, as shown in Figure 1. The advantage of this is that the direction of fluid flow changes more smoothly than ordinary valves, and the fluid vortex generated by the valve core will be much less, and the flow path will be smooth, so this inclined layout can reduce the generation of noise. In addition, in addition to the vibration and noise reduction design of the flow channel structure, the valve core part adopts two-stage throttling and pressure-reducing components, and each stage divides the flow channel area into multiple small flow channels: , arranged along the circumference of the valve core, the total flow area is basically the same as the flow area of the fluid pipeline, but considering the influence of the flow boundary layer, it is slightly larger than the flow area of the pipeline; under the premise of ensuring that the flow area, valve size and valve volume are appropriate , and strive to make the strip opening spacing as large as possible, preferably more than eight times the width of the strip, in order to minimize the intensity of the first-level disturbance noise, thereby reducing the total noise and the impact on the next level, and then suppressing the second-level vibration produce. The second stage adopts the method of punching holes on the cylindrical surface, and a large number of small holes with a diameter of 1.5mm to 2.5mm are evenly arranged, and the hole spacing is more than eight times the diameter of the hole. Also considering the influence of the turbulent boundary layer, the total flow area is 1.5 to 2 times the flow area of the pipeline, so as to achieve the purpose of two-stage step-by-step pressure reduction. For valves with a large flow rate, such as steam pipeline valves, due to the high flow rate of the working medium, in order to prevent impact noise when it flows through the valve core, the present invention proposes to cut a V-shaped notch on the edge of each small flow channel orifice.

Despite the above measures, the valve will inevitably produce a certain level of noise, which in turn will cause vibration of the valve assembly and pipeline. Therefore, in the present invention, a metal rubber gasket is respectively arranged on the upper and lower surfaces of the low-noise valve core assembly in contact with the valve body. The washer is made of metal wire through braiding and compression, which has high damping and variable stiffness characteristics, and has certain sound absorption performance, and is resistant to high temperature and corrosion. The vibration isolation effect of the metal rubber gasket effectively reduces the vibration transmission rate of the vibration system of the valve core and the valve body, and its value is very small even near the resonance peak, thereby effectively suppressing the first and second noises The vibration of the spool caused by it, and the transmission of the first-stage vibration to the valve body and pipeline. The invention has the characteristics of low noise, low vibration, easy assembly and small volume, can effectively improve the safety, reliability and service life of valves in high-pressure pipeline systems, and save operating and maintenance costs.

Description of drawings

Figure 1 is a schematic diagram of the structure of a low vibration and noise valve;

Figure 2 is a schematic diagram of the inner valve sleeve;

Figure 3 is a schematic diagram of the outer valve sleeve.

Detailed ways

The present invention is described in more detail below in conjunction with accompanying drawing example:

Combined with Figure 1. The axial direction of the valve main body 7, that is, the valve stem 1 forms an angle of 45° with the direction of the fluid inlet and outlet, and the inlet of the valve core faces the direction of the fluid flow. The metal rubber gasket 6 is arranged on the valve seat to isolate the vibration of the valve core composed of the inner valve sleeve 4 and the outer valve sleeve 5 caused by fluid pulsation impact and valve noise from propagating to the valve body. The inner valve sleeve 4 and the outer valve sleeve 5 are placed on the upper part of the gasket 6. The two are closely matched and embedded in the groove of the gasket 6. The same metal rubber gasket is arranged on the inner valve sleeve 4 and the outer valve sleeve 5, which also has the function of preventing Put the disc 3 and valve stem 1 into the groove where the valve core moves, and assemble the valve cover 2, seals and fasteners to form a complete low-vibration and noise valve.

Figure 2 and Figure 3 show the structure of the inner valve sleeve and the outer valve sleeve respectively. In Fig. 1, the valve stem 1 is at the uppermost end of its stroke, and the valve is in a fully open state. The air flow flows from the valve inlet into the valve space. Due to the streamlined internal structure and the 45° inclination of the valve, the fluid pulsation and vortex are less compared with ordinary valves, so the noise is lower. After the fluid enters the inner valve sleeve, it is ejected from the long strip opening. Compared with ordinary valves, the flow is regular, the equivalent size of the opening is small, and the pressure drop is small, so the noise generated is small, and the high-frequency sound energy accounts for a large proportion, which is less It is easy to arouse structural vibration. After the airflow enters the space between the first and second stages from the first stage, it is ejected from the second stage hole group. Because the second stage is a small hole of 1.5-2.5mm, the sound energy further moves to high frequency, even reaching 10000-20000Hz Above, the impact on the environment is small, and the attenuation is fast.

If the fluid pulsation and valve noise cause the inner and outer sleeves to vibrate, the inherent characteristics of the metal rubber gasket will prevent the vibration from propagating to the valve body and pipes, dissipating the vibration energy in the metal rubber material, and the gasket also has a certain noise reduction function.

When the valve stem 1 moves downward, as the flow area decreases, the fluid flow rate gradually decreases, and the valve plays a role in flow control, and the vibration and noise are very low. When the disc moves to the closing surface, it is tightly combined with the valve seat, and the flow rate is zero at this time, and the valve is closed.

Claims (7)

1. low-vibration noise valve, it comprises valve body, is arranged at the valve gap on the valve body, is positioned at valve seat, the spool of valve body, is positioned at the flap of spool, the valve rod that links to each other with flap; Have fluid inlet and outlet on the valve body; It is characterized in that: have plurality of small flow channels on the spool; Valve body and pipeline are 45 ° of angles of inclination, i.e. valve body axial direction that is valve rod and fluid inlet and outlet direction angle at 45.

2. low-vibration noise valve according to claim 1 is characterized in that: described spool is made up of the two-stage concentric cylindrical throttling element that inner valve sleeve, outer valve sleeve constitute, and all has plurality of small flow channels on inner valve sleeve and the outer valve sleeve; The first order throttling Flow area that plurality of small flow channels on the inner valve sleeve constitutes is slightly larger than the pipeline circulation area; The second level throttling Flow area that plurality of small flow channels on the outer valve sleeve constitutes is 1.5-2 a times of pipeline circulation area.

3. low-vibration noise valve according to claim 2 is characterized in that: the strip hole of the plurality of small flow channels on the inner valve sleeve for circumferentially distributing, and edge, hole cutting v-notch.

4. low-vibration noise valve according to claim 3 is characterized in that: the spacing of strip hole is more than the rectangular width of octuple.

5. low-vibration noise valve according to claim 2 is characterized in that: the plurality of small flow channels on the outer valve sleeve is the aperture of equally distributed 1.5mm-2.5mm on the valve pocket wall outside, and edge, hole cutting v-notch.

6. low-vibration noise valve according to claim 5 is characterized in that: hole pitch is more than the octuple orifice diameter.

7. according to any one described low-vibration noise valve of claim 1-6, it is characterized in that: spool respectively is provided with a metal-rubber packing ring up and down, and inner valve sleeve and outer valve sleeve are embedded in the groove on the metal-rubber packing ring.

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