A silencer for a laboratory exhaust system

Abstract

The utility model discloses a sound damper for laboratory exhaust system relates to sound damper technical field, including sound absorption box and subcavity subassembly, sound absorption box has sound absorption chamber, and the annular inner septum is arranged in the sound absorption box, and the sound absorption chamber is respectively sound absorption inner chamber and sound absorption outer chamber by annular inner septum, and the surface of annular inner septum is equipped with multiple circles along the sound absorption chamber axis equidistance distribution's flow guide hole group, through the straight -through structure cooperation sound absorption inner chamber's sound absorption outer chamber's airflow refraction, reflection sound attenuation principle, need not to accumulate porous material, fundamentally reduced the physical obstruction in the air duct, greatly reduced the ventilation resistance, to avoid the problem of fan wind pressure reserve shortage caused by too big resistance, guarantee exhaust system negative pressure stability, prevent harmful gas backflow risk, and through the drive subassembly control transverse separation ring piece group's unfolding or close, can flexible adjustment sound absorption outer chamber's sound attenuation subchamber quantity, realize sound attenuation efficiency and ventilation resistance dynamic balance.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, and in particular to a silencer for laboratory exhaust systems. Background Technology

[0002] As the core location for scientific research, testing, and teaching activities, laboratories rely on exhaust systems that play a crucial role in removing harmful gases generated during experiments and maintaining negative pressure balance to ensure personnel safety and a clean experimental environment. With increasing demands for precise environmental control in laboratories, the airflow and pressure of exhaust systems need to be dynamically adjusted according to experimental conditions. Furthermore, the noise generated during system operation has become a significant issue affecting the comfort and compliance of the laboratory environment.

[0003] Currently, most laboratory exhaust systems use industrial-grade silencers for noise control. Some laboratories use multi-stage resistive silencers, but the accumulation of porous materials in the ductwork leads to a significant increase in ventilation resistance. If the fan's air pressure reserve is insufficient, it can easily cause negative pressure imbalance in the exhaust system and even trigger the backflow of harmful gases.

[0004] Therefore, this utility model proposes a silencer for laboratory exhaust systems to solve the above problems. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a silencer for a laboratory exhaust system, comprising:

[0007] A silencer box, the silencer box having a silencer cavity, an annular inner partition plate arranged inside the silencer box, the silencer cavity being divided into an inner silencer cavity and an outer silencer cavity by the annular inner partition plate, and a group of multiple rings of guide holes evenly distributed along the axis of the silencer cavity are formed on the surface of the annular inner partition plate;

[0008] The cavity assembly includes multiple sets of transverse dividing ring plates located in the silencing outer cavity and linearly distributed, and two sets of spacing adjustment assemblies symmetrically distributed within the silencing outer cavity. A drive assembly is fixedly distributed at the bottom of the two sets of spacing adjustment assemblies. Each set of spacing adjustment assemblies includes multiple positioning torque adjustment members that intersect each other. Each positioning torque adjustment member intersects a set of transverse dividing ring plates. The drive assembly drives the multiple positioning torque adjustment members to rotate to close or expand the transverse dividing ring plates.

[0009] As a preferred embodiment of the silencer for laboratory exhaust systems described in this utility model, each group of transverse dividing rings includes multiple transverse dividing rings, the spacing between the multiple transverse dividing rings located in the silencer outer cavity is equal, the transverse dividing rings and the guide hole group are staggered, and the number of guide hole groups corresponds to the number of transverse dividing rings.

[0010] As a preferred embodiment of the silencer for laboratory exhaust systems described in this utility model, wherein: the multiple transverse dividing rings of each group of transverse dividing rings are sequentially a first displacement ring, a second displacement ring, and a third positioning ring; the first displacement ring and the second displacement ring are respectively installed with threaded straight cylinders at the through-holes of the two positioning torque adjustment components.

[0011] The positioning torque adjustment component includes multiple supporting torque adjustment rods. One end of each supporting torque adjustment rod passes through the positioning ring and is fitted with a limiting ring seat. The limiting ring seat is assembled on the inner wall of the silencing box. A hexagonal linkage rod is inserted between the multiple supporting torque adjustment rods.

[0012] As a preferred embodiment of the silencer for a laboratory exhaust system according to this utility model, the two supporting torque adjustment rods are respectively a first torque adjustment rod and a second torque adjustment rod. The rods of the first and second torque adjustment rods that pass through the positioning ring are smooth rods. The first torque adjustment rod has an upper external thread section at the connection point of the first displacement ring and a lower external thread section at the connection point of the first torque adjustment rod of the second displacement ring. The lengths of the upper and lower external thread sections are greater than the spacing between adjacent transverse separating rings.

[0013] As a preferred embodiment of the silencer for the laboratory exhaust system described in this utility model, the driving assembly includes a first driving motor and a second driving motor. The first driving motor drives the first torque adjusting rod to rotate, and the second driving motor drives the second torque adjusting rod at a speed greater than the speed at which the first driving motor drives the first torque adjusting rod.

[0014] As a preferred embodiment of the silencer for laboratory exhaust systems described in this utility model, the outer surface of the annular inner partition is provided with multiple guide strips at equal intervals, each group of guide holes includes multiple guide holes distributed in an annular pattern, and each guide strip is arranged between two adjacent guide holes.

[0015] The beneficial effects of this invention are as follows: By combining the straight-through structure of the silencing inner cavity with the airflow refraction and reflection silencing principle of the silencing outer cavity, there is no need to accumulate porous materials, fundamentally reducing physical obstacles in the air duct and significantly lowering ventilation resistance. This avoids the problem of insufficient fan pressure reserve due to excessive resistance, ensures stable negative pressure in the exhaust system, and prevents the risk of harmful gas backflow. Furthermore, by controlling the expansion or closure of the transverse partition ring group through the drive component, the number of silencing sub-chambers in the silencing outer cavity can be flexibly adjusted, achieving a dynamic balance between silencing efficiency and ventilation resistance. When a high silencing effect is required, the transverse partition ring group is expanded to increase the number of sub-chambers, enhancing silencing by increasing the number of airflow refractions. When the fan pressure is insufficient or exhaust efficiency needs to be prioritized, the transverse partition ring group is closed to reduce the number of sub-chambers, lowering resistance to match the system pressure, thereby dynamically controlling the balance between silencing effect and ventilation efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the silencer in this utility model;

[0018] Figure 2 This utility model Figure 1 Enlarged view of the A-section structure;

[0019] Figure 3 This utility model Figure 1 Enlarged view of the structure of section B;

[0020] Figure 4 This is a structural detail drawing of the annular inner partition in this utility model.

[0021] Explanation of reference numerals in the attached drawings: 010, silencer box; 011, annular inner partition; 012, guide bar; 013, flow guide hole group; 014, threaded straight cylinder; 015, drive motor one; 016, spacing adjustment assembly; 0161, limit ring seat; 0162, support torque adjustment rod; 0163, hexagonal linkage rod; 017, transverse partition ring group; 0171, first displacement ring; 0172, second displacement ring; 0173, third positioning ring; 018, drive motor two. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0025] Reference Figures 1-4 As shown, this embodiment provides a silencer for a laboratory exhaust system, comprising:

[0026] The muffler box 010 is a cylindrical structure that runs through the front and back. The muffler box 010 has a muffler cavity, and an annular inner partition 011 is arranged inside the muffler box 010. The muffler cavity is divided into an inner muffler cavity and an outer muffler cavity by the annular inner partition 011. The inner muffler cavity is formed by the inner sidewall of the annular inner partition 011 and is located in the core central area of ​​the muffler box 010. The inner muffler cavity has a columnar or cylindrical structure, and the inner diameter of the inner muffler cavity is the same as the front and rear opening size of the muffler box 010. The outer muffler cavity is an annular space formed between the outer sidewall of the annular inner partition 011 and the inner sidewall of the muffler box 010. It completely surrounds the outer periphery of the inner muffler cavity and shares the annular inner partition 011 as the separating boundary with the inner muffler cavity. The surface of the annular inner partition 011 has multiple rings of guide holes 013 that are evenly distributed along the axis of the muffler cavity.

[0027] The cavity assembly includes multiple sets of transverse dividing ring plates 017 located in the silencing outer cavity and linearly distributed, and two sets of spacing adjustment assemblies 016 symmetrically distributed within the silencing outer cavity. A drive assembly is fixedly distributed at the bottom of the two sets of spacing adjustment assemblies 016. Each set of spacing adjustment assemblies 016 includes multiple positioning torque adjustment members that intersect each other. Each positioning torque adjustment member intersects a set of transverse dividing ring plates 017. The drive assembly drives the multiple positioning torque adjustment members to rotate to close or expand the transverse dividing ring plates 017.

[0028] Reference Figure 1 and Figure 2As shown, each group of transverse dividing ring plates 017 includes multiple transverse dividing ring plates. The spacing between the multiple transverse dividing ring plates located in the silencing cavity is equal. The transverse dividing ring plates and the guide hole group 013 are staggered. In the annular area between each two adjacent transverse dividing ring plates, a ring of guide hole group 013 is correspondingly provided. The rings of guide hole groups 013 are equally spaced along the axial direction of the silencing cavity, and the number of guide hole groups 013 corresponds to the number of transverse dividing ring plates.

[0029] Reference Figure 2 and Figure 3 As shown, each set of transverse dividing ring pieces 017 consists of multiple transverse dividing ring pieces, namely, a first displacement ring piece 0171, a second displacement ring piece 0172, and a third positioning ring piece 0173. The first displacement ring piece 0171 and the second displacement ring piece 0172 are connected by a threaded straight cylinder 014 at the through-hole of the two positioning torque adjustment components.

[0030] The positioning torque adjustment component includes multiple supporting torque adjustment rods 0162. One end of each supporting torque adjustment rod 0162 passes through a positioning ring and is fitted with a limiting ring seat 0161. The limiting ring seat 0161 is assembled on the inner wall of the silencer box 010. A hexagonal linkage rod 0163 is inserted between the multiple supporting torque adjustment rods 0162. The multiple supporting torque adjustment rods 0162 of each group of positioning torque adjustment components rotate together through the hexagonal linkage rod 0163.

[0031] Furthermore, the two supporting torque adjustment rods 0162 are the first torque adjustment rod and the second torque adjustment rod, respectively. The rods of the first torque adjustment rod and the second torque adjustment rod that pass through the positioning ring are set as smooth rods. The first torque adjustment rod has an upper external thread section at the connection of the first displacement ring 0171, and the first torque adjustment rod has a lower external thread section at the connection of the second displacement ring 0172. The lengths of the upper external thread section and the lower external thread section are greater than the spacing between adjacent transverse dividing rings.

[0032] Furthermore, the drive assembly includes a drive motor 015 and a drive motor 018. The drive motor 015 drives the first torque adjustment rod to rotate, and the drive motor 018 drives the second torque adjustment rod to rotate at twice the speed of the first torque adjustment rod.

[0033] Reference Figure 1 and Figure 4 As shown, multiple guide strips 012 are equally spaced on the outer surface of the annular inner partition 011. Each group of guide holes 013 includes multiple guide holes distributed in an annular pattern, and each guide strip 012 is arranged between two adjacent guide holes.

[0034] Working principle: When laboratory exhaust enters the silencer box 010, the airflow mainly flows along the silencer cavity, while part of the airflow enters the silencer sub-chamber through the guide hole group 013 on the surface of the annular inner partition 011.

[0035] Within the silencing outer cavity, transverse partition rings 017 and guide hole groups 013 are staggered. Each annular area between two adjacent transverse partition rings corresponds to a ring of guide holes 013, forming multiple independent silencing sub-chambers. The airflow entering the silencing outer cavity undergoes multiple refractions, reflections, and energy dissipation within these sub-chambers to achieve the silencing effect. Therefore, the more silencing sub-chambers there are, the more times the airflow refracts within them, resulting in more significant energy attenuation and higher silencing efficiency.

[0036] When the silencing efficiency needs to be adjusted according to the exhaust speed or silencing requirements, drive motor 1 015 and drive motor 2 018 drive the two sets of positioning torque adjustment components to rotate, thereby causing the positioning torque adjustment components to rotate. This causes the first displacement ring 0171 and the second displacement ring 0172 to unfold or close in the same direction along the threaded section of the torque adjustment rod, increasing or decreasing the spacing between the transverse dividing rings, thereby increasing or decreasing the number of sub-chambers divided in the silencing outer cavity, thus changing the number of folds of the airflow in the silencing outer cavity and adjusting the silencing effect.

[0037] In addition, the guide strip 012 on the outer surface of the annular inner partition 011 ensures that the movement of the transverse partition ring is linear under the drive of a single positioning torque adjustment component.

[0038] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0039] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0040] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sound attenuator for a laboratory exhaust system, characterized by, include: A silencing box (010) has a silencing cavity. An annular inner partition (011) is arranged inside the silencing box (010). The silencing cavity is divided into an inner silencing cavity and an outer silencing cavity by the annular inner partition (011). Multiple groups of guide holes (013) are formed on the surface of the annular inner partition (011) and are evenly distributed along the axis of the silencing cavity. The cavity assembly includes multiple sets of transverse dividing ring plates (017) located in the silencing outer cavity and linearly distributed, and two sets of spacing adjustment assemblies (016) symmetrically distributed in the silencing outer cavity. The bottom of the two sets of spacing adjustment assemblies (016) is fixed with a driving assembly. Each set of spacing adjustment assemblies (016) includes multiple positioning torque adjustment members that intersect each other. Each positioning torque adjustment member intersects a set of transverse dividing ring plates (017). The driving assembly drives the multiple positioning torque adjustment members to rotate to close or expand the transverse dividing ring plates (017).

2. The sound attenuator for a laboratory exhaust system of claim 1, wherein: Each set of the transverse partition rings (017) includes multiple transverse partition rings. The spacing between the multiple transverse partition rings located in the silencing outer cavity is equal. The transverse partition rings and the flow guide hole group (013) are staggered, and the number of flow guide hole groups (013) corresponds to the number of transverse partition rings.

3. The sound attenuator for a laboratory exhaust system of claim 2, wherein: Each set of transverse dividing ring pieces (017) consists of multiple transverse dividing ring pieces, which are sequentially a first displacement ring piece (0171), a second displacement ring piece (0172), and a third positioning ring piece (0173). The first displacement ring piece (0171) and the second displacement ring piece (0172) are fitted with threaded straight cylinders (014) at the through-hole of the two positioning torque adjustment components. The positioning torque adjustment component includes multiple supporting torque adjustment rods (0162). The supporting torque adjustment rods (0162) pass through one end of the positioning ring and are fitted with a limiting ring seat (0161). The limiting ring seat (0161) is assembled on the inner wall of the silencer box (010). A hexagonal linkage rod (0163) is inserted between the multiple supporting torque adjustment rods (0162).

4. The sound attenuator for a laboratory exhaust system of claim 3, wherein: The two supporting torque adjustment rods (0162) are respectively the first torque adjustment rod and the second torque adjustment rod. The rods of the first torque adjustment rod and the second torque adjustment rod are smooth rods that pass through the positioning ring plate. The first torque adjustment rod has an upper external thread section at the connection of the first displacement ring plate (0171) and a lower external thread section at the connection of the first torque adjustment rod to the second displacement ring plate (0172). The length of the upper external thread section and the lower external thread section is greater than the distance between adjacent transverse dividing ring plates.

5. The sound attenuator for a laboratory exhaust system of claim 4, wherein: The drive assembly includes a first drive motor (015) and a second drive motor (018). The first drive motor (015) drives the first torque adjustment rod to rotate, and the second drive motor (018) drives the second torque adjustment rod at a speed greater than the speed at which the first drive motor (015) drives the first torque adjustment rod.

6. The sound attenuator for a laboratory exhaust system of claim 5, wherein: The outer surface of the annular inner partition (011) is provided with multiple guide strips (012) at equal intervals. Each group of guide holes (013) includes multiple guide holes distributed in an annular pattern. Each guide strip (012) is arranged between two adjacent guide holes.

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