An AFV axial flow valve specific muffler

Abstract

The application discloses a special muffler for an AFV (Air Flow Valve) axial flow valve, and relates to the field of AFV axial flow valve muffler devices.The technical scheme is as follows: a special muffler for an AFV axial flow valve, comprising a valve body, two detachable rectifier fence tighteners arranged in the valve body, a stretchable sleeve ring arranged between the rectifier fence tighteners, and radially arranged inclined grooves on the rectifier fence tighteners for gas to pass through; a sound-absorbing and rectifying part is arranged in the rectifier fence tightener at the gas outlet end of the valve body and adheres to the inner side wall of the rectifier fence tightener; one end of the sound-absorbing and rectifying part close to the gas outlet is covered with a sound-absorbing panel; and a lock ring is fixedly connected to the outlet end of the rectifier fence tightener and used for tightly fixing the sound-absorbing and rectifying part and the sound-absorbing panel in the rectifier fence tightener.The technical effect is that the structure is simple, the noise reduction effect is good, and the installation is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of AFV axial flow valve silencer device, in particular to a kind of AFV axial flow valve special silencer. BACKGROUND

[0002] With the rapid development of natural gas industry, large flow natural gas pipeline transportation technology has been rapidly developed, and the regulator is one of the most important core devices in the natural gas pipeline transportation link, such as AFV axial flow valve commonly used for controlling the pressure and flow of large flow pipeline.

[0003] But when natural gas flows through AFV axial flow valve, the gas pressure at the inlet end of the valve body is very high, and the gas pressure at the outlet end of the valve body is far lower than that at the inlet end of the valve body. Due to the high pressure difference, the natural gas pressure drops sharply, so that the natural gas pressure at the position with the smallest flow area in the valve body reaches the speed of sound or slightly below the speed of sound. At this time, the pressure of natural gas does not reach the minimum value. When the natural gas pressure continues to decrease, the natural gas will accelerate to generate supersonic airflow, thereby generating a loud shock wave, causing AFV axial flow valve to produce very loud noise during operation, which greatly harms the production and life of on-site operators. Therefore, it is necessary for equipment manufacturers to solve the problem of reducing the noise generated by AFV axial flow valve during operation.

[0004] At present, the Chinese invention with publication number CN103591375A discloses an external multi-purpose silencer, which comprises a silencer shell, 1-4 silencer plates are placed in the silencer shell, and a silencer cover is used to compress the silencer plates. The silencer shell and the silencer cover are sealed by a first metal winding gasket with a positioning ring, to prevent leakage. A second metal winding gasket with an inner and outer ring is arranged between the outlet flange and the inlet end of the silencer shell, and a third metal winding gasket with an inner and outer ring is arranged between the pipeline flange and the silencer cover.

[0005] The existing invention reduces noise by arranging multiple silencer plates outside the valve, but the external silencer can only absorb the noise emitted by the valve body through the silencer plates, which can only treat the symptoms and not the root cause, and the noise reduction effect is limited. The commonly used external silencer can only reduce the noise by about 15dB at most, and the noise reduction effect is not obvious enough, which has room for improvement. SUMMARY

[0006] The present application aims to provide a kind of AFV axial flow valve special silencer, which has the advantages of simple structure, good noise reduction effect and easy installation.

[0007] The technical scheme of the present application is as follows: an AFV axial flow valve special silencer, comprising a valve body, two detachable flow barrier sealers are arranged inside the valve body, and a plurality of radial inclined grooves for gas passing through are arranged on the flow barrier sealers along the circumferential direction; the flow barrier sealer located at the gas outlet end of the valve body is provided with a sound-absorbing flow regulating part which is attached to the inner side wall of the flow barrier sealer, one end of the sound-absorbing flow regulating part close to the gas outlet is covered with a sound-absorbing panel, and a locking ring is fixedly connected to the outlet end of the flow barrier sealer for tightly fixing the sound-absorbing flow regulating part and the sound-absorbing panel in the flow barrier sealer.

[0008] The present application further provides that the sound-absorbing flow regulating part is composed of at least three foam metal rings arranged in layers, and the inner side wall of each adjacent foam metal ring is attached to the outer side wall and gradually reduces in diameter.

[0009] The present application further provides that the foam metal ring is in a conical structure, and the diameter of the foam metal ring gradually increases along the flow direction of the gas.

[0010] The present application further provides that the sound-absorbing flow regulating part is provided with four foam metal rings.

[0011] The present application further provides that the foam metal ring and the sound-absorbing panel are both made of foam metal nickel alloy.

[0012] The present application further provides that the pore size of the foam metal nickel alloy is between 2-3mm.

[0013] The present application further provides that the locking ring is fixedly connected in the flow barrier sealer based on thread locking, the flow barrier sealer is provided with an inner fastening thread, and the locking ring is provided with an outer fastening thread matched with the inner fastening thread.

[0014] The present application further provides that a plurality of notches are uniformly and interval arranged on the outer fastening thread along the circumferential direction, and a knob part for facilitating manual tightening is fixedly arranged in the locking ring.

[0015] The present application further provides that the locking ring and the flow barrier sealer are both made of cast steel.

[0016] In summary, the present application has the following advantages:

[0017] 1. A silencing and rectifying section and a silencing panel are installed inside the rectifier grille seal located at the outlet end of the valve body, fitting against the inner side wall of the rectifier grille seal. The silencing and rectifying section is composed of four layers of foam metal rings stacked on top of each other. On the one hand, the silencing and rectifying section is installed layer by layer inside the outlet of the valve body. When high-pressure gas passes through the silencing and rectifying section, after being filtered and separated by multiple layers of foam metal rings, the shock waves and turbulence generated when the gas flows at high speed are absorbed and rectified, suppressing the acceleration process of the gas. This achieves noise elimination from the source of noise, thus achieving a silencing effect that is significantly better than that of an external silencer. On the other hand, the built-in method does not require changing the installation method of the AFV axial flow valve or the structure of the valve body. It is easy to disassemble and assemble, has low installation cost, and can be mass-produced.

[0018] 2. The foam metal ring is made of foam metal nickel alloy. Because foam metal nickel alloy has a wide temperature range and is strong and erosion resistant, it can improve the service life. On the other hand, the pores of the foam metal can reduce the impact on the flow rate and provide a certain filtering effect on the gas.

[0019] 3. The locking ring is fixedly connected to the rectifier grid seal using a threaded connection. A knob is fixedly installed inside the locking ring. When the locking ring is locked in the rectifier grid seal, it can be easily locked by simply turning the knob. At the same time, several slots are provided on the external fastening thread to reduce the difficulty of rotating the locking ring. Attached Figure Description

[0020] Figure 1 This is an exploded view of the overall structure of Example 1;

[0021] Figure 2 yes Figure 1 Enlarged schematic diagram of part A;

[0022] Figure 3 This is a schematic diagram of a half-section structure of Example 1;

[0023] Figure 4 This is a schematic diagram of the rotating snap-fit ​​assembly of Embodiment 2.

[0024] Reference numerals: 1. Valve body; 2. Rectifier grid seal; 4. Inclined groove; 5. Silencing and rectifying part; 51. Foam metal ring; 6. Silencing panel; 7. Locking ring; 8. Internal fastening thread; 9. External fastening thread; 10. Groove; 11. Knob part; 12. Rotary snap-fit ​​assembly; 121. Locking block; 122. Locking groove; 123. Insertion groove. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Embodiment 1:

[0027] With reference to Figure 1 and Figure 3 , a muffler special for AFV axial flow valve, comprising a valve body 1 in a circular ring structure, two detachable flow barrier sealers 2 are arranged inside the valve body 1, the two flow barrier sealers 2 are in a conical bowl structure, the tail parts of the two flow barrier sealers 2 with smaller diameters are butt jointed, an expandable sleeve is arranged between the two flow barrier sealers 2, a plurality of radial inclined grooves 4 for gas passing through are arranged on the flow barrier sealer 2 along the circumferential direction, a sound-absorbing flow regulating part 5 is arranged in the flow barrier sealer 2 at the gas outlet end of the valve body 1 and adheres to the inner side wall of the flow barrier sealer 2, a sound-absorbing panel 6 is arranged at one end of the sound-absorbing flow regulating part 5 close to the gas outlet, and a locking ring 7 is fixedly connected at the outlet end of the flow barrier sealer 2 for tightly fixing the sound-absorbing flow regulating part 5 and the sound-absorbing panel 6 in the flow barrier sealer 2. In this embodiment, the foam metal ring 51 and the sound-absorbing panel 6 are both made of foam metal nickel alloy, but are not limited to the foam metal nickel alloy material, and can also be made of foam metal aluminum alloy material.

[0028] With reference to Figure 1 and Figure 3 , specifically, the sound-absorbing flow regulating part 5 is composed of at least 3 layers of foam metal rings 51 arranged in layers, the inner side wall and the outer side wall of adjacent foam metal rings 51 from the outside to the inside are attached and the ring diameter gradually decreases, the foam metal ring 51 is in a conical structure, and the ring diameter of the foam metal ring 51 gradually increases along the flow direction of the gas. In this embodiment, the sound-absorbing flow regulating part 5 preferably has 4 layers of foam metal rings 51, when high-pressure gas passes through the sound-absorbing flow regulating part 5, the shock wave and turbulence generated by the high-speed flow of the gas after being filtered and separated layer by layer through the 4 layers of foam metal rings 51 are absorbed and regulated, the acceleration process of the gas is inhibited, the noise is eliminated from the source of the sound, and the sound-absorbing effect is achieved, the sound-absorbing effect is obviously better than that of the external muffler, the noise reduction effect of the AFV axial flow valve can reach 26dB, the sound-absorbing effect is obviously better than that of the external muffler, and the measurement data is shown in the following table:

[0029] Inlet pressure (MPA) Outlet pressure (MPA) Instantaneous flow (m3) AFV Axial Flow Valve Model Valve body size Outlet pipe diameter Manifold noise Notes 2.2 0.35 17000 AFV + ZSC-100 + Combination 6”300# DN300 102 dB (without muffler) Station edge: 98 dB Station door in: 86 dB Station door out: 75 dB 2.2 0.35 17000 AFV + ZSC-100 + Combination 6”300# DN300 78 dB (first monitoring) Station edge: 75 dB Station door in: 73 dB Station door out: 73 dB 2.2 0.35 17000 AFV + ZSC-100 + Combination 6”300# DN300 76 dB (second monitoring) Station edge: 73 dB Station door in: 70 dB Station door out: 70 dB

[0030] Specifically, the pore diameter of the foam metal nickel alloy is between 2-3mm, preferably 2mm, which achieves the best sound-absorbing effect with the smallest influence on the flow.

[0031] With reference to Figure 1 and Figure 2Specifically, the lock ring 7 is fixedly connected in the rectifier fence tightener 2 based on threaded locking, an inner fastening thread 8 is arranged on the rectifier fence tightener 2, an outer fastening thread 9 is arranged on the lock ring 7 and cooperates with the inner fastening thread 8, and a plurality of notches 10 are uniformly and evenly arranged on the outer fastening thread 9 along the circumferential direction, so that the rotation difficulty of the rotating lock ring 7 is reduced and the lock ring 7 is not loosened. A knob part 11 for manual rotation is fixedly arranged in the lock ring 7, the knob part 11 includes a rotating ring coaxially arranged with the lock ring 7 and a connecting block uniformly and fixedly arranged around the rotating ring along the circumferential direction, so as to reduce the influence on the flow. In this embodiment, the lock ring 7 and the rectifier fence tightener 2 are both made of cast steel.

[0032] Embodiment 2:

[0033] Reference Figure 4 The lock ring 7 can also be fixedly connected in the rectifier fence tightener 2 based on the rotating clamping assembly 12, the rotating clamping assembly 12 includes a clamping block 121 uniformly and fixedly connected to the outer side wall of the lock ring 7 along the circumferential direction, the rectifier fence tightener 2 is provided with a clamping groove 122 corresponding to the clamping block 121 and a plug-in groove 123 for the clamping block 121 to enter, the clamping block 121 and the clamping groove 122 are provided with n, when it is needed to fixedly install the lock ring 7 in the rectifier fence tightener 2, only the clamping block 121 is needed to be correspondingly inserted into the plug-in groove 123 and rotated 360° / n. In this embodiment, the clamping block 121 and the clamping groove 122 are both provided with four.

[0034] Brief use process: first, the foam metal ring 51 is installed in the cavity of the rectifier fence tightener 2 from the outside to the inside, so that the foam metal ring 51 is attached to the inner side wall of the rectifier fence tightener 2 and the inner side wall of the adjacent foam metal ring 51 is attached to the outer side wall, then the sound-absorbing panel 6 is installed, and finally the knob part 11 is rotated to lock the lock ring 7 to the outlet end of the rectifier fence tightener 2.

[0035] This specific embodiment is only an explanation of the present application and is not a limitation of the present application. Those skilled in the art can make creative contributions to modify this embodiment according to the needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A silencer specifically for AFV axial flow valves, comprising a valve body (1), wherein the valve body (1) is provided with two detachable flow-rectifying grille seals (2), and the flow-rectifying grille seals (2) are provided with radially arranged inclined grooves (4) along the circumferential direction for gas passage; characterized in that, The rectifier grille seal (2) located at the outlet end of the valve body (1) is provided with a silencing rectifier part (5) that fits against the inner side wall of the rectifier grille seal (2). The end of the silencing rectifier part (5) near the outlet is covered with a silencing panel (6). The outlet end of the rectifier grille seal (2) is fixedly connected with a locking ring (7) for pressing and fixing the silencing rectifier part (5) and the silencing panel (6) inside the rectifier grille seal (2). The noise reduction and rectification part (5) is composed of no less than 3 layers of foam metal rings (51) stacked together. From the outside to the inside, the inner sidewalls of adjacent foam metal rings (51) are attached to the outer sidewalls and the ring diameter gradually decreases. The foam metal ring (51) has a conical structure, and the ring diameter of the foam metal ring (51) gradually increases along the gas flow direction; Both the foam metal ring (51) and the sound-absorbing panel (6) are made of foam metal nickel alloy.

2. The silencer for AFV axial flow valves according to claim 1, characterized in that, The noise reduction and rectification section (5) is provided with four layers of foam metal rings (51).

3. The silencer for AFV axial flow valves according to claim 1, characterized in that, The pore size of the foamed nickel alloy is between 2 and 3 mm.

4. A silencer for AFV axial flow valves according to claim 1, characterized in that, The locking ring (7) is fixedly connected to the rectifier gate seal (2) by threaded locking. The rectifier gate seal (2) is provided with an inner fastening thread (8), and the locking ring (7) is provided with an outer fastening thread (9) that cooperates with the inner fastening thread (8).

5. A silencer for AFV axial flow valves according to claim 4, characterized in that, The external fastening thread (9) has several slots (10) evenly spaced along the circumferential direction, and the locking ring (7) has a knob (11) that is easy to tighten manually.

6. A silencer for AFV axial flow valves according to claim 5, characterized in that, Both the locking ring (7) and the rectifier fence seal (2) are made of cast steel.

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