Base type exhaust muffler for oil-free screw blower

Abstract

The utility model belongs to the auxiliary equipment technical field of oil -free screw blower, especially is a base formula exhaust silencer for oil -free screw blower, including installation base, silencer box and air inlet connector and air outlet connector, still including flow guide connector and silencing subassembly, flow guide connector detachably installed in air inlet connector, and fixed with multiple flow guide bowl that distributes along the axial equal interval in flow guide connector, the dismounting mouth that is used for dismounting silencing subassembly is set up in silencer box, and the silencing subassembly includes fixed frame and the sound absorption cotton fixed in fixed frame, through the combination of flow guide connector and silencing subassembly, can simultaneously attenuate 85 - 110dB's medium high frequency turbulent flow noise and low frequency airflow pulsation noise, and the sound attenuation coverage is wider, can satisfy the noise emission requirement of most industrial scene, flow guide connector adopts flange detachable design, and silencing subassembly adopts detachable plug -in structure, does not need to dismount entire silencer when maintaining, and the operation is convenient.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for oil-free screw blowers, specifically relating to a base-type exhaust silencer for oil-free screw blowers. Background Technology

[0002] Oil-free screw blowers are high-efficiency and environmentally friendly positive displacement gas compression devices. They achieve gas compression through the rotation of twin screw rotors, without the use of lubricating oil throughout the process, ensuring clean output gas.

[0003] Oil-free screw blowers generate mid-to-high frequency noise of 85-110dB during exhaust. Existing silencing solutions have the following problems: 1. Most silencers only use a single resistive (sound-absorbing cotton) or reactive (expansion chamber) structure, which cannot simultaneously cover the low-frequency airflow pulsation noise and high-frequency turbulence noise of the blower exhaust, resulting in limited silencing effect; 2. Most silencing components are sealed designs, and after long-term use, the sound-absorbing material is prone to dust accumulation and moisture absorption, requiring complete disassembly for maintenance, which is complicated.

[0004] To address the aforementioned problems, this utility model proposes a base-type exhaust silencer for an oil-free screw blower. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a base-type exhaust silencer for oil-free screw blowers, which features convenient use, good noise reduction effect, and easy maintenance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a base-type exhaust silencer for an oil-free screw blower, comprising a mounting base for support and fixation, a silencer box disposed on the mounting base, and an air inlet pipe and an air outlet pipe respectively communicating with the interior of the silencer box, and further comprising a flow guide pipe and a silencer assembly;

[0007] The flow guide pipe is detachably installed inside the air intake pipe, and a plurality of flow guide bowls are fixed inside the flow guide pipe at equal intervals along the axial direction. A flow guide hole is provided in the middle of the flow guide bowl, and a plurality of overflow holes are provided on the flow guide pipe at equal intervals along the circumferential direction.

[0008] The silencing component is detachably installed inside the silencing box. The silencing box has an opening for assembling and disassembling the silencing component. The silencing component includes a fixing frame and sound-absorbing cotton fixed inside the fixing frame.

[0009] As a preferred embodiment of this utility model, a first flange is fixed to the inner wall of the air intake pipe, and a second flange that mates with the first flange is fixed to the outer wall of the flow guide pipe.

[0010] As a preferred embodiment of this utility model, a rubber sealing ring is provided between the first flange and the second flange.

[0011] As a preferred technical solution of this utility model, it also includes a U-shaped insert frame and a locking mechanism;

[0012] The U-shaped insert frame is fixed inside the silencing box, and a slot is provided inside the U-shaped insert frame for the fixed frame to be inserted. After the fixed frame is inserted into the slot, it is locked by a locking mechanism.

[0013] As a preferred technical solution of this utility model, the locking mechanism includes a limiting plate, a fixing block and a manual bolt;

[0014] The limiting plate is fixed to the top of the fixing frame, the fixing block is fixed to the top of the outer side of the silencer box, and the manual bolt passes through the limiting plate and is connected to the fixing block by thread engagement.

[0015] As a preferred embodiment of this utility model, a rubber sealing frame is provided between the limiting plate and the silencer box.

[0016] As a preferred embodiment of this utility model, a handle is fixed to the outer wall of the limiting plate.

[0017] In a preferred embodiment of this invention, the outer wall of the fixing frame abuts against the inner wall of the slot.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. By combining the flow guide pipe with the noise reduction component, it can simultaneously reduce mid-to-high frequency turbulent noise and low-frequency airflow pulsation noise by 85-110dB, with a wider noise reduction coverage, which can meet the noise emission requirements of most industrial scenarios.

[0020] 2. The flow guide pipe adopts a detachable flange design, and the silencer component adopts a detachable plug-in structure, so there is no need to disassemble the entire silencer during maintenance, making operation convenient.

[0021] Other additional advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the isometric structure of this utility model;

[0025] Figure 3 This utility model Figure 1 Enlarged structural diagram at point A in the diagram;

[0026] Figure 4 This utility model Figure 1 Enlarged structural diagram at point B in the diagram;

[0027] Figure 5 This utility model Figure 2 A magnified schematic diagram of the locking mechanism in the diagram;

[0028] Figure 6 This is a schematic diagram of the isometric structure of the flow guide pipe in this utility model.

[0029] In the diagram: 1. Mounting base; 2. Silencer box; 21. Disassembly port; 3. Air inlet pipe; 31. First flange; 4. Flow guide pipe; 41. Flow guide bowl; 411. Flow guide hole; 42. Overflow hole; 43. Second flange; 5. Air outlet pipe; 6. Silencer assembly; 61. Fixing frame; 62. Sound-absorbing cotton; 63. U-shaped insert frame; 631. Slot; 7. Locking mechanism; 71. Limiting plate; 72. Fixing block; 73. Manual bolt; 74. Rubber sealing frame; 75. Handle; 8. Rubber sealing ring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-6 The present invention provides the following technical solution: a base-type exhaust silencer for an oil-free screw blower, comprising a mounting base 1 for support and fixation, a silencer box 2 disposed on the mounting base 1, and an air inlet pipe 3 and an air outlet pipe 5 respectively communicating with the interior of the silencer box 2, and further comprising a flow guide pipe 4 and a silencer assembly 6.

[0032] Furthermore, by Figure 1 and Figure 2As shown, in this embodiment, the flow guide pipe 4 is detachably installed inside the air intake pipe 3, and multiple flow guide bowls 41 are fixed inside the flow guide pipe 4 at equal intervals along the axial direction. A flow guide hole 411 is opened in the middle of the flow guide bowl 41, and multiple overflow holes 42 are opened on the flow guide pipe 4 at equal intervals along the circumferential direction. The silencing component 6 is detachably installed inside the silencing box 2, and a disassembly and assembly port 21 for disassembling and assembling the silencing component 6 is opened on the silencing box 2. The silencing component 6 includes a fixing frame 61 and sound-absorbing cotton 62 fixed inside the fixing frame 61. With the above solution, when in use, the mounting base 1 is fixed to the oilless screw blower or other external fixed objects with bolts, and the flow guide pipe 4 is connected to the air outlet pipe of the oilless screw blower with a flange. The pressurized gas discharged by the oilless screw blower first enters the flow guide pipe 4. After the gas enters the flow guide pipe 4, it will pass through multiple equally spaced flow guide bowls 41 along the axial direction in sequence.

[0033] Most of the gas is guided through the guide hole 411 in the middle of the guide bowl 41 to achieve "segmented guidance", which avoids the gas directly impacting the inner wall of the intake pipe 3 and the guide pipe 4 to generate turbulence noise, and at the same time makes the airflow direction more stable.

[0034] A small portion of the gas is evenly distributed through the overflow hole 42 on the circumference of the guide pipe 4, further reducing the airflow speed and pressure fluctuations, reducing the aerodynamic noise caused by high-speed airflow, and achieving preliminary "flow stabilization and noise reduction".

[0035] Ultimately, the airflow will pass through the overflow hole 42 into the intake pipe 3, flow within the intake pipe 3 until it enters the muffler box 2 and comes into full contact with the detachable muffler assembly 6.

[0036] The fixing frame 61 of the silencing component 6 provides support for the overall structure, ensuring the stable distribution of the sound-absorbing cotton 62. When the airflow passes through the sound-absorbing cotton 62, its internal porous structure will "absorb and dissipate" the sound waves. The sound wave energy is converted into heat energy by the vibration of the sound-absorbing cotton 62 fibers, thereby greatly reducing the intensity of exhaust noise and completing the core "sound absorption and noise reduction".

[0037] Finally, the clean gas, after two noise reduction treatments, is smoothly discharged through the exhaust pipe 5 connected to the silencer box 2. Throughout the process, the mounting base 1 provides a stable support for the silencer box 2, pipes and other components, preventing the vibration of the equipment during operation from being transmitted to the outside and generating additional noise, while ensuring the installation stability of the overall structure.

[0038] If maintenance is required later, the muffler component 6 can be disassembled through the disassembly port 21 on the muffler box 2, or the guide pipe 4 can be removed for cleaning or replacement to ensure long-term noise reduction effect.

[0039] Optionally, by Figure 1 and Figure 4As shown in this embodiment, a first flange 31 is fixed to the inner wall of the port of the air intake pipe 3, and a second flange 43 that cooperates with the first flange 31 is fixed to the outer wall of the flow guide pipe 4. With the above solution, when the muffler is assembled, the first flange 31 on the inner wall of the port of the air intake pipe 3 and the second flange 43 on the outer wall of the flow guide pipe 4 will be precisely aligned and tightly connected by fasteners such as bolts.

[0040] On the one hand, the rigid structure of the flange allows the intake pipe 3 and the guide pipe 4 to form a coaxial and non-offset airflow channel, avoiding airflow turbulence at the joint due to loose connection, and ensuring that the gas enters the guide pipe 4 and the intake pipe 3 smoothly.

[0041] On the other hand, when it is necessary to clean the impurities inside the guide pipe 4 or replace the guide pipe 4, simply remove the fasteners on the flange to remove the guide pipe 4 from the air inlet pipe 3 without damaging the overall pipeline structure, thus reducing the complexity of maintenance operations.

[0042] Preferably, by Figure 1 and Figure 4 As shown in this embodiment, a rubber sealing ring 8 is provided between the first flange 31 and the second flange 43. With the above solution, the rubber sealing ring 8 has good elasticity and deformation ability during use. When under pressure, it can tightly fill the tiny gaps between the two flange mating surfaces. Even under the high pressure condition of the blower exhaust, it can block the micro-leakage of gas, which not only avoids the decrease in exhaust efficiency caused by pressure loss, but also prevents the additional noise generated by the friction between the leaked gas and the outside air.

[0043] Preferably, by Figures 1-3 , Figure 5 As shown, this embodiment also includes a U-shaped insert frame 63 and a locking mechanism 7. The locking mechanism 7 includes a limiting plate 71, a fixing block 72, and a manual bolt 73. The U-shaped insert frame 63 is fixed inside the muffler box 2, and a slot 631 for the fixing frame 61 to be inserted is provided inside the U-shaped insert frame 63. After the fixing frame 61 is inserted into the slot 631, it is locked by the locking mechanism 7. The limiting plate 71 is fixed to the top of the fixing frame 61, the fixing block 72 is fixed to the top of the outer side of the muffler box 2, and the manual bolt 73 passes through the limiting plate 71 and is connected to the fixing block 72 by threaded engagement. After adopting the above scheme, during the installation stage of the silencing component 6, the U-shaped insert frame 63 is welded and fixed to the inner wall of the silencing box 2. The slot 631 provided by the U-shaped insert frame 63 provides a precise insertion guide for the fixed frame 61. The operator only needs to push the fixed frame 61 containing the sound-absorbing cotton 62 into the slot 631. The two side walls and the bottom wall of the U-shaped insert frame 63 will form lateral and bottom limits on the fixed frame 61, preventing the fixed frame 61 from shifting when it is inserted. This ensures that the silencing component 6 can quickly align with the airflow channel inside the silencing box 2, laying the positional foundation for subsequent sound absorption operations.

[0044] After the fixed frame 61 is fully inserted into the slot 631, the limiting plate 71 fixed to the top of the fixed frame 61 will move synchronously with the fixed frame 61 to align with the fixing block 72 on the top of the outer side of the muffler box 2. At this time, the bolt hole on the limiting plate 71 is coaxial with the threaded hole of the fixing block 72. After the operator passes the manual bolt 73 through the bolt hole of the limiting plate 71, the manual bolt 73 is rotated clockwise. The threaded engagement is used to gradually screw the manual bolt 73 into the threaded hole of the fixing block 72. As the manual bolt 73 is tightened, its head will exert downward axial pressure on the limiting plate 71, pressing the fixed frame 61 tightly into the slot 631, forming a double fixing effect of "U-shaped insert frame 63 lateral limiting + locking mechanism 7 top fixing". This avoids the impact of high-pressure airflow during the operation of the muffler, which may cause the fixed frame 61 to shake or shift, and ensures that the sound-absorbing cotton 62 can always be in full contact with the airflow and stably play its sound absorption and noise reduction role.

[0045] When maintenance of the silencing component 6 is required (such as replacing the aging sound-absorbing cotton 62), simply loosen the manual bolt 73 counterclockwise to release the head of the manual bolt 73 from the pressure constraint on the limiting plate 71, and then pull out the fixing frame 61 along the opening direction of the slot 631. There is no need to disassemble the U-shaped insert frame 63 or damage the structure of the silencing box 2, which greatly simplifies the disassembly and assembly process of the silencing component 6 and reduces maintenance time and operation difficulty.

[0046] Preferably, by Figures 1-3 , Figure 5 As shown in this embodiment, a rubber sealing frame 74 is provided between the limiting plate 71 and the muffler box 2. With the above solution, when in use, the rubber sealing frame 74 can tightly fill the small assembly gap between the limiting plate 71 and the outer side of the muffler box 2, preventing the airflow inside the muffler box 2 (including residual noise that has not been completely silenced) from overflowing from the gap. This not only prevents the leakage of "secondary noise" but also eliminates the loss of exhaust efficiency caused by gas leakage, further improving the overall silencing and sealing performance.

[0047] In addition, when the silencer is running, the silencer assembly 6 will vibrate slightly due to the impact of airflow. This vibration will be transmitted to the limiting plate 71 through the fixed frame 61. The elastic properties of the rubber sealing frame 74 can absorb this vibration, preventing the limiting plate 71 (metal material) from directly and rigidly contacting the silencer box 2 (metal material) and transmitting vibration, thereby reducing the "metal contact noise" caused by vibration friction between the two, and further reducing the overall operating noise of the equipment.

[0048] Preferably, by Figures 1-3 , Figure 5As shown in this embodiment, a handle 75 is fixed to the outer wall of the limiting plate 71. With the above solution, when it is necessary to disassemble the muffler assembly 6, the operator can directly hold the handle 75 to apply force without using tools to pry the limiting plate 71 or to find the position to apply force, making the operation more convenient.

[0049] Preferably, by Figures 1-3 As shown, in this embodiment, the outer wall of the fixing frame 61 abuts against the inner wall of the slot 631. With the above solution, during use, the abutting fit eliminates the lateral gap between the fixing frame 61 and the slot 631, so that the airflow in the silencing box 2 cannot bypass the sound-absorbing cotton 62 in the fixing frame 61. All airflow must be forced through the sound-absorbing cotton 62 to continue flowing, avoiding the problem of incomplete silencing caused by "bypass airflow", ensuring that the sound-absorbing cotton 62 fully exerts its sound absorption and noise reduction function, and significantly improving the overall silencing effect.

[0050] In addition, in the mating state, the inner wall of the slot 631 forms an all-round lateral constraint on the fixed frame 61. Even if the high-pressure airflow impacts the fixed frame 61 during the operation of the silencer, the fixed frame 61 will not sway or shift laterally. At the same time, the gapless fit avoids friction and collision between the outer wall of the fixed frame 61 and the inner wall of the slot 631 due to vibration, eliminates "metal friction noise", and further reduces the operating noise of the equipment.

[0051] Components not described in detail in this article are existing technologies.

[0052] The working principle and usage process of this utility model: When using the exhaust silencer of this utility model, the mounting base 1 is fixed to the oilless screw blower or other fixed objects with bolts, and the guide pipe 4 is connected to the exhaust pipe of the oilless screw blower with a flange. The pressurized gas discharged from the oilless screw blower first enters the guide pipe 4. After the gas enters the guide pipe 4, it will pass through multiple equally spaced guide bowls 41 along the axial direction.

[0053] Most of the gas is guided through the guide hole 411 in the middle of the guide bowl 41 to achieve "segmented guidance", which avoids the gas directly impacting the inner wall of the air inlet pipe 3 and the guide pipe 4 to generate turbulence noise, and at the same time makes the airflow direction more stable.

[0054] A small portion of the gas is evenly distributed through the overflow hole 42 on the circumference of the guide pipe 4, further reducing the airflow speed and pressure fluctuations, reducing the aerodynamic noise caused by high-speed airflow, and achieving preliminary "flow stabilization and noise reduction".

[0055] Finally, the airflow will pass through the overflow hole 42 and enter the intake pipe 3, where it will flow until it enters the muffler box 2 and makes full contact with the detachable muffler assembly 6.

[0056] The fixing frame 61 of the sound-absorbing component 6 provides support for the overall structure, ensuring the stable distribution of the sound-absorbing cotton 62. When the airflow passes through the sound-absorbing cotton 62, its internal porous structure will "absorb and dissipate" the sound waves. The sound wave energy is converted into heat energy by the vibration of the sound-absorbing cotton 62 fibers, thereby greatly reducing the intensity of the exhaust noise and completing the core "sound absorption and noise reduction".

[0057] Finally, the clean gas, after two noise reduction treatments, is smoothly discharged through the exhaust pipe 5 connected to the silencer box 2. Throughout the process, the mounting base 1 provides a stable support for the silencer box 2, pipes and other components, preventing the vibration of the equipment during operation from being transmitted to the outside and generating additional noise, while ensuring the installation stability of the overall structure.

[0058] If maintenance is required later, the manual bolt 73 can be unscrewed counterclockwise, and the fasteners connecting the first flange 31 and the second flange 43 can be removed. The muffler assembly 6 can be disassembled through the disassembly port 21 on the muffler box 2, or the guide pipe 4 can be removed for cleaning and replacement to ensure long-term noise reduction effect.

[0059] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A base-mounted exhaust silencer for an oil-free screw blower, comprising a mounting base (1) for support and fixation, a silencer box (2) disposed on the mounting base (1), and an inlet pipe (3) and an outlet pipe (5) respectively communicating with the interior of the silencer box (2), characterized in that: It also includes a flow guide pipe (4) and a noise reduction component (6); The flow guide pipe (4) is detachably installed inside the air intake pipe (3), and a plurality of flow guide bowls (41) are fixed inside the flow guide pipe (4) at equal intervals along the axial direction. A flow guide hole (411) is opened in the middle of the flow guide bowl (41), and a plurality of overflow holes (42) are opened on the flow guide pipe (4) at equal intervals along the circumferential direction. The silencing component (6) is detachably installed inside the silencing box (2). The silencing box (2) has a disassembly port (21) for disassembling and assembling the silencing component (6). The silencing component (6) includes a fixing frame (61) and sound-absorbing cotton (62) fixed inside the fixing frame (61).

2. The base-type exhaust silencer for an oil-free screw blower according to claim 1, characterized in that: The inner wall of the intake pipe (3) is fixed with a first flange (31), and the outer wall of the guide pipe (4) is fixed with a second flange (43) that cooperates with the first flange (31).

3. The base-type exhaust silencer for an oil-free screw blower according to claim 2, characterized in that: A rubber sealing ring (8) is provided between the first flange (31) and the second flange (43).

4. The base-type exhaust silencer for an oil-free screw blower according to claim 1, characterized in that: It also includes a U-shaped insert (63) and a locking mechanism (7); The U-shaped insert frame (63) is fixed inside the silencing box (2), and a slot (631) for the fixing frame (61) to be inserted is provided inside the U-shaped insert frame (63). After the fixing frame (61) is inserted into the slot (631), it is locked by the locking mechanism (7).

5. A base-type exhaust silencer for an oil-free screw blower according to claim 4, characterized in that: The locking mechanism (7) includes a limiting plate (71), a fixing block (72), and a manual bolt (73); The limiting plate (71) is fixed to the top of the fixing frame (61), the fixing block (72) is fixed to the top of the outer side of the silencer box (2), and the manual bolt (73) passes through the limiting plate (71) and is connected to the fixing block (72) by thread engagement.

6. A base-type exhaust silencer for an oil-free screw blower according to claim 5, characterized in that: A rubber sealing frame (74) is provided between the limiting plate (71) and the silencer box (2).

7. A base-type exhaust silencer for an oil-free screw blower according to claim 6, characterized in that: A handle (75) is fixed to the outer wall of the limiting plate (71).

8. A base-type exhaust silencer for an oil-free screw blower according to claim 4, characterized in that: The outer wall of the fixing frame (61) abuts against the inner wall of the slot (631).

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