Air duct noise reduction device of heating ventilation air conditioner

Abstract

The utility model discloses an air pipe noise reduction device of a heating ventilation air conditioner, which comprises a warm air pipe, the surface of the warm air pipe is provided with a second thread, the surface of the second thread is in threaded connection with a connecting sleeve, the front surface of the connecting sleeve is fixedly connected with a noise reduction cylinder, the inner wall of the noise reduction cylinder is provided with a first thread, and the first thread is fixedly connected with the connecting sleeve. The surface of the first thread is in threaded connection with a threaded rod, one end of the threaded rod is fixedly connected with a cover plate, a noise reduction sleeve is slidably connected into the noise reduction cylinder, a limiting groove is formed in the surface of the noise reduction sleeve, a limiting rod is fixedly connected to the inner wall of the noise reduction cylinder, and the surface of the limiting rod is slidably connected into the limiting groove. The cover plate is screwed on the first thread in the noise reduction sleeve through the threaded rod, the threaded rod can abut against the side face of the noise reduction sleeve and limit the noise reduction sleeve front and back, a worker can clean or replace the noise reduction sleeve by opening the cover plate, the noise reduction sleeve is prevented from being blocked by dust, and the noise reduction effect of the noise reduction sleeve can be improved.

Description

Technical Field

[0001] The utility model relates to the field of air duct noise reduction devices, in particular to an air duct noise reduction device for a heating, ventilation and air conditioning system. Background Art

[0002] Patent No. CN206556222U discloses a duct silencing and noise reduction device and a duct structure. The utility model has a reasonable structural design, a streamlined internal structure of the device, simple manufacturing, high reliability and low cost.

[0003] However, in the above-mentioned existing duct silencer and noise reduction device and duct structure, the air column at the small hole aperture on the micro-perforated plate and the air in the air cavity form a splint silencer structure. When the external noise audio frequency and the natural frequency of the elastic system are the same, it causes a strong resonance of the air at the small aperture, generates friction and consumes sound energy, so that the device achieves the effect of silencer and noise reduction. The device absorbs sound energy by setting a sound-absorbing and thermal insulation layer. Due to the lack of a disassembly structure for the effective thermal insulation layer, after long-term use, the dust in the warm air will adhere to the sound-absorbing and thermal insulation layer, resulting in a reduction in the effect of the sound-absorbing and thermal insulation layer.

[0004] In order to solve the above problems, the utility model provides a duct noise reduction device for a heating, ventilation and air conditioning system. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a duct noise reduction device for HVAC to solve the technical problem in the prior art that "the air column at the small hole aperture on the micro-perforated plate and the air in the air cavity form a splint silencer structure. When the external noise audio frequency is the same as the natural frequency of the elastic system, it causes a strong resonance of the air at the small aperture, generating friction to consume sound energy, so that the device achieves the effect of silencing and noise reduction. The device absorbs sound energy by setting a sound-absorbing and thermal insulation layer. Due to the lack of a disassembly structure for the effective thermal insulation layer, after long-term use, dust in the warm air will adhere to the sound-absorbing and thermal insulation layer, resulting in a reduction in the effect of the sound-absorbing and thermal insulation layer."

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: it includes a warm air pipe, the surface of the warm air pipe is provided with a second thread, the surface of the second thread is threadedly connected with a connecting sleeve, the front of the connecting sleeve is fixedly connected with a noise reduction cylinder, the inner wall of the noise reduction cylinder is provided with a first thread, the surface of the first thread is threadedly connected with a threaded rod, one end of the threaded rod is fixedly connected with a cover plate, the noise reduction sleeve is slidably connected inside the noise reduction cylinder, a limiting groove is provided on the surface of the noise reduction sleeve, a limiting rod is fixedly connected to the inner wall of the noise reduction cylinder, and the surface of the limiting rod is slidably connected in the limiting groove.

[0007] As a preferred technical solution of the utility model, the side surface of the cover plate is provided with anti-slip grooves, and the back surface of the cover plate is sealed and connected to the front surface of the noise reduction cylinder.

[0008] As a preferred technical solution of the utility model, the diameter of the threaded rod matches the inner diameter of the noise reduction cylinder, and the diameter of the noise reduction sleeve matches the inner diameter of the noise reduction cylinder.

[0009] As a preferred technical solution of the present utility model, the shape of the limiting rod matches the shape of the limiting slot, and the number of the limiting rod matches the number of the limiting slot.

[0010] As a preferred technical solution of the utility model, the interior of the connecting sleeve is connected to the interior of the noise reduction tube, and a plurality of ventilation holes are provided on the side of the noise reduction tube.

[0011] As a preferred technical solution of the utility model, the diameter of the warm air pipe matches the inner diameter of the connecting sleeve, and one end of the threaded rod abuts against the front side of the noise reduction sleeve.

[0012] The utility model provides a duct noise reduction device for HVAC, which has the following beneficial effects:

[0013] The cover plate is tightened on the first thread in the noise reduction cylinder through a threaded rod. The threaded rod can rest against the side of the noise reduction sleeve and limit the front and rear positions of the noise reduction sleeve. The staff can open the cover plate and the noise reduction sleeve for cleaning or replacement to avoid dust clogging the noise reduction sleeve, thereby improving the noise reduction effect of the noise reduction sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a HVAC air duct noise reduction device proposed by the utility model;

[0015] Figure 2 This is a structural schematic diagram of a threaded rod of a HVAC duct noise reduction device proposed by the utility model;

[0016] Figure 3 The utility model is a cross-sectional structural schematic diagram of a noise reduction cylinder of a duct noise reduction device for a heating, ventilation and air conditioning.

[0017] In the figure: 1 warm air duct, 2 connecting sleeve, 3 noise reduction sleeve, 4 vent hole, 5 cover plate, 6 noise reduction sleeve, 7 limit groove, 8 limit rod, 9 threaded rod, 10 first thread, 11 second thread, 12 anti-slip pattern. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0019] refer to Figure 1-3 The utility model provides a technical solution: it includes a warm air pipe 1, the surface of the warm air pipe 1 is provided with a second thread 11, the surface of the second thread 11 is threadedly connected with a connecting sleeve 2, the front of the connecting sleeve 2 is fixedly connected with a noise reduction cylinder 3, the inner wall of the noise reduction cylinder 3 is provided with a first thread 10, the surface of the first thread 10 is threadedly connected with a threaded rod 9, by setting the threaded rod 9, when the threaded rod 9 is tightened on the first thread 10 in the noise reduction cylinder 3, the noise reduction sleeve 6 can be limited forward and backward while the cover plate 5 is tightly fitted on the front of the noise reduction cylinder 3, one end of the threaded rod 9 is fixedly connected with the cover plate 5, the noise reduction sleeve 6 is slidably connected in the noise reduction cylinder 3, a limiting groove 7 is provided on the surface of the noise reduction sleeve 6, the inner wall of the noise reduction cylinder 3 is fixedly connected with a limiting rod 8, and the surface of the limiting rod 8 is slidably connected in the limiting groove 7.

[0020] Among them, the side of the cover plate 5 is provided with anti-skid grooves 12. By providing the anti-skid grooves 12, the anti-skid grooves 12 can increase the friction force when the staff rotates the cover plate 5. The back side of the cover plate 5 is sealed and connected to the front side of the noise reduction cylinder 3.

[0021] The diameter of the threaded rod 9 matches the inner diameter of the noise reduction cylinder 3 , and the diameter of the noise reduction sleeve 6 matches the inner diameter of the noise reduction cylinder 3 .

[0022] Among them, the shape of the limiting rod 8 matches the shape of the limiting groove 7. When the limiting rod 8 slides into the limiting groove 7, it can achieve a limiting effect on the noise reduction sleeve 6. The number of limiting rods 8 matches the number of limiting grooves 7.

[0023] The inside of the connecting sleeve 2 is connected with the inside of the noise reduction tube 3 , and the warm air can enter the noise reduction tube 3 through the connecting sleeve 2 for noise reduction processing. A plurality of ventilation holes 4 are provided on the side of the noise reduction tube 3 .

[0024] Among them, the diameter of the warm air pipe 1 matches the inner diameter of the connecting sleeve 2, and one end of the threaded rod 9 abuts against the front side of the noise reduction sleeve 6. The threaded rod 9 abuts against the front side of the noise reduction sleeve 6 to limit the front and rear positions of the noise reduction sleeve 6.

[0025] The working principle of the utility model is as follows: when in use, the staff first tightens the connecting sleeve 2 on the warm air pipe 1 of the HVAC, and then inserts the noise reduction sleeve 6 backward into the noise reduction tube 3. The limiting groove 7 in the noise reduction sleeve 6 can prevent the noise reduction sleeve 6 from rotating during operation under the restriction of the limiting rod 8. The staff tightens the threaded rod 9 on the first thread 10 in the noise reduction tube 3 by rotating the cover plate 5 clockwise. At this time, the threaded rod 9 is against the side of the noise reduction sleeve 6, and the noise reduction sleeve 6 can be limited forward and backward. The warm air generated by the HVAC during operation can enter the connecting sleeve 2 through the warm air pipe 1, and then enters the noise reduction tube 3 and is subjected to noise reduction treatment through the noise reduction sleeve 6. The warm air after noise reduction is discharged through the vent 4.

[0026] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and utility model concept of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model.

Claims

1. A duct noise reduction device for a heating, ventilation and air conditioning system, comprising a warm air duct (1), characterized in that: The surface of the warm air pipe (1) is provided with a second thread (11), the surface of the second thread (11) is threadedly connected to a connecting sleeve (2), the front of the connecting sleeve (2) is fixedly connected to a noise reduction cylinder (3), the inner wall of the noise reduction cylinder (3) is provided with a first thread (10), the surface of the first thread (10) is threadedly connected to a threaded rod (9), one end of the threaded rod (9) is fixedly connected to a cover plate (5), the noise reduction cylinder (3) is slidably connected with a noise reduction sleeve (6), the surface of the noise reduction sleeve (6) is provided with a limiting groove (7), the inner wall of the noise reduction cylinder (3) is fixedly connected to a limiting rod (8), and the surface of the limiting rod (8) is slidably connected in the limiting groove (7).

2. The HVAC duct noise reduction device according to claim 1, characterized in that: The side surface of the cover plate (5) is provided with anti-slip grooves (12), and the back surface of the cover plate (5) is sealed and connected to the front surface of the noise reduction cylinder (3).

3. The HVAC duct noise reduction device according to claim 1, characterized in that: The diameter of the threaded rod (9) matches the inner diameter of the noise reduction cylinder (3), and the diameter of the noise reduction sleeve (6) matches the inner diameter of the noise reduction cylinder (3).

4. The HVAC duct noise reduction device according to claim 1, characterized in that: The shape of the limiting rod (8) matches the shape of the limiting groove (7), and the number of the limiting rods (8) matches the number of the limiting grooves (7).

5. The HVAC duct noise reduction device according to claim 1, characterized in that: The interior of the connecting sleeve (2) is connected to the interior of the noise reduction cylinder (3), and a plurality of ventilation holes (4) are provided on the side of the noise reduction cylinder (3).

6. The HVAC duct noise reduction device according to claim 1, characterized in that: The diameter of the warm air pipe (1) matches the inner diameter of the connecting sleeve (2), and one end of the threaded rod (9) abuts against the front side of the noise reduction sleeve (6).

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