Noise reduction laboratory ventilation pipe

Abstract

The utility model discloses a noise reduction laboratory ventilating pipe, which belongs to the technical field of laboratory ventilating pipes and comprises a ventilating straight pipe, the output end of the ventilating straight pipe is fixedly communicated with a ventilating curved pipe, the input end of the ventilating straight pipe is fixedly connected with an air inlet noise reduction box, and a noise reduction structure is mounted in the air inlet noise reduction box. The noise reduction structure comprises a conical air hole formed in the inner wall of the interior of the air inlet noise reduction box, and the front end of the conical air hole is fixedly connected with a mounting ring. According to the utility model, through the supporting force applied to the connecting ring and the mounting ring by the two ends of the spiral spring, the friction force of threads between the bolt and the threaded hole can be effectively improved, so that the mounting of the fan is more stable and safer, the looseness in the long-time use process is avoided, the noise is reduced, and the service life of the fan is prolonged. And secondly, the cross section of the ventilation curved pipe is S-shaped, so that the air can be further absorbed by the rock wool layer in the circulation process, and the noise reduction effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of laboratory ventilation pipes, and in particular relates to a noise-reducing laboratory ventilation pipe. Background Art

[0002] During experiments, various harmful gases may be generated, such as toxic gases from the volatilization of chemical reagents and irritating gases from experimental reactions. If these harmful gases are not discharged in time, they will cause damage to the respiratory and nervous systems of laboratory personnel. The ventilation system can quickly discharge these harmful gases from the laboratory, reducing the risk of personnel exposure to harmful gases.

[0003] During ventilation in existing ventilation systems, the internal fan rotates at high speed for a long time, which can easily cause the bolts that secure the fan to loosen. As a result, the fan will generate vibrations during rotation. This vibration will be transmitted to other parts of the ventilation system through the connecting pipes, causing the pipes to vibrate and radiate noise. Utility Model Content

[0004] The purpose of the utility model is to provide a noise-reducing laboratory ventilation duct to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a noise-reducing laboratory ventilation duct, comprising a straight ventilation pipe, the output end of the straight ventilation pipe is fixedly connected to a curved ventilation pipe, the input end of the straight ventilation pipe is fixedly connected to an air inlet noise reduction box, a noise reduction structure is installed inside the air inlet noise reduction box, the noise reduction structure comprises a conical air hole opened on the inner wall of the air inlet noise reduction box, the front end of the conical air hole is fixedly connected to a mounting ring, a threaded hole is opened on the inner wall of the front side of the mounting ring, a coil spring is fixedly connected to the inside of the threaded hole, the front side of the mounting ring is fixedly connected to a connecting ring by bolts, the inside of the connecting ring is fixedly connected to a fan, and a second wind rectifying plate is fixedly connected to the inside of the air inlet noise reduction box and in front of the fan.

[0006] As a preferred embodiment, the threaded holes are located on the front of the mounting ring and are distributed in a circular array. The connecting ring is connected to the threaded holes by bolts. The second air rectifying plate is located inside the air inlet noise reduction box and is distributed in parallel up and down.

[0007] As a preferred embodiment, a guide strip is fixedly connected to the inner side surface of the straight ventilation pipe, the output end of the curved ventilation pipe is fixedly connected to an air outlet noise reduction box, and an air rectification plate is fixedly connected to the interior of the air outlet noise reduction box.

[0008] As a preferred embodiment, the guide strips are located on the side surface inside the ventilation straight pipe and are distributed in a circular array, and the air rectification plates are located inside the air outlet noise reduction box and are distributed in parallel up and down.

[0009] As a preferred embodiment, an installation groove is provided on the inner wall of the top of the air outlet noise reduction box, and positioning grooves are provided on the inner wall of the installation groove in a square array, and a filter plate is slidably connected to the interior of the installation groove.

[0010] As a preferred embodiment, the filter plate includes a filter screen, the front and rear ends of the filter screen are slidably connected to retaining nails in a square array, and the top of the filter screen is fixedly connected to a handle.

[0011] As a preferred embodiment, the ventilation curved pipe includes a stainless steel pipe, the inner side surface of the stainless steel pipe is provided with a rock wool layer, the inner side surface of the rock wool layer is fixedly installed with a perforated metal pipe, the inner side surface of the perforated metal pipe is fixedly connected with a guide bar 2, and the guide bar 2 is distributed in a circular array on the inner side surface of the perforated metal pipe.

[0012] As a preferred embodiment, the fan includes a support frame fixedly connected to the interior of the connecting ring, a rotating motor is fixedly connected to the interior of the support frame, and a fan blade is fixedly connected to the transmission end of the rotating motor.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model, firstly, can effectively increase the friction force of the threads between the bolt and the threaded hole by applying the supporting force to the connecting ring and the mounting ring through the two ends of the coil spring, thereby making the installation of the fan more stable and safe, avoiding loosening during long-term use, and thus reducing the generation of noise; secondly, the cross-section of the ventilation curved pipe is S-shaped, so the air will be further absorbed by the rock wool layer during the circulation process, thereby playing a role in noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall three-dimensional schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a three-dimensional schematic diagram of the interior of the air outlet noise reduction box of the utility model structure;

[0017] Figure 3 This is a schematic diagram of the exterior of the air outlet noise reduction box of the utility model structure;

[0018] Figure 4 A three-dimensional schematic diagram of the interior of the air inlet noise reduction box of the utility model structure

[0019] Figure 5 For the utility model structure Figure 4 A magnified 3D diagram of the details at point A

[0020] Figure 6 This is a three-dimensional schematic diagram of the interior of the air intake noise reduction box of the utility model structure

[0021] Figure 7 A three-dimensional schematic diagram of the filter plate structure of the utility model

[0022] Figure 8 This is a schematic plan view of a vertical section of a curved ventilation pipe of the utility model structure.

[0023] In the figure: 1. Ventilation straight pipe; 2. Ventilation curved pipe; 3. Air inlet noise reduction box; 4. Guide strip 1; 5. Air outlet noise reduction box; 6. Air rectification plate 1; 7. Mounting slot; 8. Positioning slot; 9. Filter plate; 31. Conical air hole; 32. Mounting ring; 33. Threaded hole; 34. Coil spring; 35. Connecting ring; 36. Fan; 37. Air rectification plate 2; 21. Stainless steel pipe; 22. Rock wool layer; 23. Perforated metal pipe; 24. Guide strip 2; 361. Support frame; 362. Rotating motor; 363. Fan blade; 91. Filter; 92. Stop nail; 93. Handle. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the embodiments.

[0025] The following examples are intended to illustrate the present invention and are not intended to limit the scope of protection of the present invention. The conditions in the examples may be further adjusted according to specific conditions. Simple improvements to the method of the present invention based on the concept of the present invention fall within the scope of protection claimed by the present invention.

[0026] See also Figures 1-8 The utility model provides a noise reduction laboratory ventilation duct, comprising a ventilation straight pipe 1, the output end of the ventilation straight pipe 1 is fixedly connected to a ventilation curved pipe 2, the input end of the ventilation straight pipe 1 is fixedly connected to an air inlet noise reduction box 3, and a noise reduction structure is installed inside the air inlet noise reduction box 3, the noise reduction structure comprises a tapered air hole 31 provided on the inner wall of the air inlet noise reduction box 3, a mounting ring 32 is fixedly connected to the front end of the tapered air hole 31, a threaded hole 33 is provided on the inner wall of the front face of the mounting ring 32, a coil spring 34 is fixedly connected to the inside of the threaded hole 33, a connecting ring 35 is fixedly connected to the front face of the mounting ring 32 by bolts, a fan 36 is fixedly connected to the inside of the connecting ring 35, and a second air rectifying plate 37 is fixedly connected to the inside of the air inlet noise reduction box 3 and in front of the fan 36;

[0027] The vertical section of the air straightening plate 2 37 is diamond-shaped, which enables the air to enter the interior of the ventilation straight pipe 1 more evenly during the circulation process. The vertical sections of the ventilation straight pipe 1 and the ventilation curved pipe 2 are both circular, which can reduce the turbulence and eddy current of the air flow and reduce the air flow noise. The interior of the air inlet noise reduction box 3 and the air outlet noise reduction box 5 is provided with glass wool, which can absorb the noise. The coil spring 34 can increase the firmness and stability of the threaded connection between the bolt and the threaded hole 33 through its own elasticity during the installation of the fan 36. The cross-section of the ventilation curved pipe 2 is S-shaped, so the noise will contact the inner wall of the ventilation curved pipe 2 during the flow, thereby playing a role in noise reduction.

[0028] The threaded holes 33 are located on the front of the mounting ring 32 and are distributed in a circular array. The connecting ring 35 is connected to the threaded holes 33 by bolts. The second air straightening plate 37 is located inside the air inlet noise reduction box 3 and is distributed in parallel up and down.

[0029] Specifically, such as Figure 2 and Figure 3 As shown, a guide strip 4 is fixedly connected to the side surface of the inner side of the ventilation straight pipe 1, and an outlet noise reduction box 5 is fixedly connected to the output end of the ventilation curved pipe 2. An air rectifying plate 6 is fixedly connected to the inner side of the outlet noise reduction box 5.

[0030] The installation of the guide strip 4 can make the air circulate evenly and reduce the air flow noise.

[0031] The guide strips 4 are located on the side surface of the interior of the ventilation straight pipe 1 and are distributed in a circular array. The air rectifying plates 6 are located inside the air outlet noise reduction box 5 and are distributed in parallel up and down.

[0032] Specifically, such as Figure 3 As shown, the inner wall of the top of the air outlet noise reduction box 5 is provided with a mounting groove 7, the inner wall of the mounting groove 7 is provided with positioning grooves 8 in a square array, and a filter plate 9 is slidably connected to the interior of the mounting groove 7;

[0033] The filter plate 9 can not only filter the dust and impurities in the air, but also play the role of mobile sound insulation and noise reduction.

[0034] Specifically, such as Figure 7 As shown, the filter plate 9 includes a filter screen 91, the front and rear ends of the filter screen 91 are slidably connected to retaining nails 92 in a square array, and the top of the filter screen 91 is fixedly connected to a handle 93;

[0035] The inside of the stop pin 92 is provided with a spring which is contracted when subjected to pressure; during the sliding installation of the filter plate 9 in the installation groove 7, the filter plate 9 is lowered, the stop pin 92 is contracted due to friction, and when the filter plate 9 is lowered to the bottom of the installation groove 7, the stop pin 92 is located in the position of the positioning groove 8; since the positioning groove 8 is deep and cannot contact the stop pin 92, the stop pin 92 is ejected and inserted into the inside of the positioning groove 8, thereby fixing the filter plate 9.

[0036] Specifically, as shown in Figure 8 The ventilation elbow 2 comprises a stainless steel pipe 21, the side surface of the inside of the stainless steel pipe 21 is provided with a rock wool layer 22, the side surface of the inside of the rock wool layer 22 is fixedly installed with a perforated metal pipe 23, the side surface of the inside of the perforated metal pipe 23 is fixedly connected with a flow guide strip two 24, and the flow guide strip two 24 is arranged in an annular array on the side surface of the inside of the perforated metal pipe 23.

[0037] The stainless steel pipe 21 can protect the rock wool layer 22, and the rock wool layer 22 can absorb noise; the perforated metal pipe 23 can not only support and protect the rock wool layer 22, but also can make noise be better absorbed by the rock wool layer 22 through the holes formed in the inside.

[0038] Specifically, as shown in Figure 6 The fan 36 comprises a support frame 361 fixedly connected to the inside of the connecting ring 35, the inside of the support frame 361 is fixedly connected with a rotating motor 362, and the transmission end of the rotating motor 362 is fixedly connected with a fan blade 363.

[0039] The working principle and use process of the utility model are as follows: in the process of use, the staff first installs the air inlet noise reduction box 3 outdoors, then connects the ventilation straight pipe 1, and selectively installs the ventilation elbow 2 according to the distance, and finally installs the air outlet noise reduction box 5 at the output end of the ventilation elbow 2.

[0040] Then when the fan 36 is installed in the air inlet noise reduction box 3, the connecting ring 35 needs to be aligned with the position of the mounting ring 32, then a bolt is screwed into the inside of the threaded hole 33 through the connecting ring 35, thereby being screw-connected, and in the process of screw-connection, the bolt drives the connecting ring 35 to move towards the mounting ring 32, and in the process of movement, the screw spring 34 is pressed, and the counterforce of the screw spring 34 also supports the connecting ring 35, finally the bolt is screwed to a proper distance, and the installation of the fan 36 is completed, the supporting force of the screw spring 34 on the connecting ring 35 and the mounting ring 32 can effectively improve the friction force of the screw thread between the bolt and the threaded hole 33, thereby making the installation of the fan 36 more stable and safe, avoiding loosening in the process of long-time use, and thus reducing the generation of noise;

[0041] Afterwards, the external air is blown by the fan 36 and passes through the air inlet noise reduction box 3, the ventilation straight pipe 1, the ventilation curved pipe 2 and the air outlet noise reduction box 5, and then enters the room to ventilate the room.

[0042] When the air passes through the air inlet noise reduction box 3 and the air outlet noise reduction box 5, the noise generated by the air circulation and the noise generated by the fan 36 will be absorbed by the glass wool inside the air inlet noise reduction box 3 and the air outlet noise reduction box 5;

[0043] When the air passes through the straight ventilation pipe 1 and the curved ventilation pipe 2, it will be guided by the guide strip 1 4 and the guide strip 2 24, making the air circulation more uniform and reducing the generation of noise. In addition, since the cross section of the curved ventilation pipe 2 is S-shaped, the air will be further absorbed by the rock wool layer 22 during the circulation process, thereby playing a role in noise reduction.

[0044] Finally, when the air is discharged from the air outlet noise reduction box 5, the air will be filtered by the filter plate 9 and the noise will be further reduced.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A noise-reducing laboratory ventilation duct, comprising a ventilation straight duct (1), characterized in that: The output end of the ventilation straight pipe (1) is fixedly connected to the ventilation curved pipe (2), and the input end of the ventilation straight pipe (1) is fixedly connected to the air inlet noise reduction box (3). The air inlet noise reduction box (3) is internally installed with a noise reduction structure, and the noise reduction structure includes a conical air hole (31) provided on the inner wall of the air inlet noise reduction box (3). The front end of the conical air hole (31) is fixedly connected to a mounting ring (32), the inner wall of the front face of the mounting ring (32) is provided with a threaded hole (33), the inside of the threaded hole (33) is fixedly connected to a coil spring (34), the front face of the mounting ring (32) is fixedly connected to a connecting ring (35) by bolts, the inside of the connecting ring (35) is fixedly connected to a fan (36), and a second wind rectifying plate (37) is fixedly connected to the inside of the air inlet noise reduction box (3) and located in front of the fan (36).

2. The noise reduction laboratory ventilation duct according to claim 1, characterized in that: The threaded holes (33) are located on the front of the mounting ring (32) and are distributed in a circular array. The connecting ring (35) is connected to the threaded holes (33) by bolts. The second air rectifying plate (37) is located inside the air inlet noise reduction box (3) and is distributed in parallel up and down.

3. The noise reduction laboratory ventilation duct according to claim 1, characterized in that: A guide strip (4) is fixedly connected to the inner side surface of the straight ventilation pipe (1), an output end of the curved ventilation pipe (2) is fixedly connected to an air outlet noise reduction box (5), and an air rectification plate (6) is fixedly connected to the inner side of the air outlet noise reduction box (5).

4. The noise reduction laboratory ventilation duct according to claim 3, characterized in that: The guide strips (4) are located on the side surface of the interior of the ventilation straight pipe (1) and are distributed in a circular array. The wind rectification plates (6) are located inside the air outlet noise reduction box (5) and are distributed in parallel up and down.

5. The noise reduction laboratory ventilation duct according to claim 4, characterized in that: The inner wall of the top of the air outlet noise reduction box (5) is provided with a mounting groove (7), the inner wall of the mounting groove (7) is provided with positioning grooves (8) in a square array, and a filter plate (9) is slidably connected inside the mounting groove (7).

6. The noise reduction laboratory ventilation duct according to claim 5, characterized in that: The filter plate (9) comprises a filter screen (91), the front and rear ends of the filter screen (91) are slidably connected to retaining nails (92) in a square array, and the top of the filter screen (91) is fixedly connected to a handle (93).

7. The noise reduction laboratory ventilation duct according to claim 1, characterized in that: The ventilation curved pipe (2) comprises a stainless steel pipe (21), the inner side surface of the stainless steel pipe (21) is provided with a rock wool layer (22), the inner side surface of the rock wool layer (22) is fixedly mounted with a perforated metal pipe (23), the inner side surface of the perforated metal pipe (23) is fixedly connected with a second guide bar (24), and the second guide bar (24) is located on the inner side surface of the perforated metal pipe (23) and is distributed in a ring array.

8. The noise reduction laboratory ventilation duct according to claim 1, characterized in that: The fan (36) comprises a support frame (361) fixedly connected to the interior of the connecting ring (35); a rotating motor (362) is fixedly connected to the interior of the support frame (361); and a fan blade (363) is fixedly connected to the transmission end of the rotating motor (362).

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