Silencer for heating and ventilation equipment

Abstract

The utility model relates to a silencer for heating and ventilation equipment, which structurally comprises an air inlet pipe, a speed reducing pipe, a silencing box, an air guide pipe and an air outlet pipe which are sequentially connected, fixing rings are arranged on the outer surfaces of the air inlet pipe and the air outlet pipe, and the fixing rings are connected with an outer wall through a fixing mechanism with a cushioning device. The air guide pipe is in a cone shape with the outer diameter gradually reduced from the end close to the silencing box to the end close to the air outlet pipe. During working, air enters from the air inlet pipe, the speed reducing pipe at the rear end of the air inlet pipe can reduce the flow speed of air and reduce noise, the silencing box at the rear end of the speed reducing pipe can absorb noise in the air, and the conical air guide pipe at the rear end of the silencing box can prevent the air from generating friction with the air guide pipe to generate noise again. The silencer for the heating and ventilation equipment has the advantages that the problem that the existing silencer for the heating and ventilation equipment is not ideal in silencing effect is solved; the problem that an existing silencer for heating and ventilation equipment cannot resist shock is solved.

Description

Technical Field

[0001] The utility model relates to a muffler for HVAC equipment and belongs to the technical field of muffler. Background Art

[0002] HVAC equipment generally includes three aspects: heating, ventilation, and air conditioning. During the operation of the HVAC equipment system, pipeline transportation is an important component of the entire system operation. It not only plays a connecting role, but also is responsible for the pipeline transportation of materials. If noise is generated during operation, it will spread along the pipeline transportation and affect the normal life of residents passing by.

[0003] CN219810030U records a HVAC equipment silencer, which includes a pipe body and a silencing device installed inside the pipe body for silencing. The ends of the pipe body are respectively installed with interfaces for connecting HVAC pipes; the silencing device includes a frame for air diversion and sound-absorbing materials laid on the frame. The HVAC equipment silencer disperses the airflow into multiple strands through the frame, evenly disperses the airflow, and makes the airflow fully contact with the sound-absorbing material, thereby eliminating the noise in the airflow and achieving a good noise reduction effect.

[0004] The muffler in the prior art has a relatively simple structure and is difficult to absorb all the noise; and it does not have an anti-vibration function. When air flows through the muffler or there is external force interference, vibration will occur, which will also generate noise. Utility Model Content

[0005] The utility model provides a muffler for HVAC equipment, which aims to overcome the above-mentioned deficiencies in the prior art, improve the noise absorption effect, and achieve earthquake resistance.

[0006] The technical solution of the utility model is: a silencer for HVAC equipment, the structure of which includes an air inlet pipe, a speed reduction pipe, a muffler box, an air guide pipe and an air outlet pipe connected in sequence, and a fixing ring is provided on the outer surface of the air inlet pipe and the air outlet pipe, and the fixing ring is connected to the outer wall through a fixing mechanism with a shock absorbing device, and the air guide pipe is in a tapered shape with the outer diameter gradually decreasing from the end close to the muffler box to the end close to the air outlet pipe. When working, the wind enters from the air inlet pipe, the speed reduction pipe at the rear end of the air inlet pipe can slow down the flow rate of the air and reduce the generation of noise, the muffler box at the rear end of the speed reduction pipe can absorb the noise in the air, and the tapered air guide pipe at the rear end of the muffler box can prevent the friction between the air and the air guide pipe from generating noise again.

[0007] Preferably, flanges are provided at the outer ends of the air outlet pipe and the air inlet pipe respectively, so as to facilitate connection with the heating and ventilation duct.

[0008] Preferably, the fixing mechanism includes a bracket, a base plate, a fixing seat and a buffer box. The bracket is connected to both sides of the fixing ring for supporting the muffler. The bottom end of the bracket is connected to the base plate. The base plate is connected to the buffer box for sliding up and down. When the base plate is subjected to pressure, it can slide inside the buffer box. The shock-absorbing device is arranged in the buffer box to absorb the vibration generated by the muffler. The bottom of the buffer box is connected to the fixing seat, and the fixing seat is connected to the outer wall.

[0009] Preferably, the shock absorbing device comprises a support column, a connecting shaft, a collar, a first spring, a damping rod, a second spring and a rotating rod. There are two support columns respectively arranged on both sides of the bottom of the buffer box. A connecting shaft is connected between the two support columns. A pair of collars are slidably sleeved on the connecting shaft. A first spring is sleeved on the connecting shaft between the two support columns and the corresponding adjacent collars. The top of the support column is connected to the bottom surface of the base plate through a damping rod. The damping rod is sleeved with a second spring. The damping rod can absorb the elastic potential energy of the second spring. The upper end of the collar is hinged to the lower end of the rotating rod. The upper ends of the rotating rods on both sides are hinged to the center of the bottom surface of the base plate. The rotating rod can rotate relative to the collar and the base plate when under pressure. When the muffler vibrates, the bracket squeezes the base plate to move in the buffer box, and the collar moves on the connecting shaft to squeeze the first spring. The first spring deforms to absorb part of the vibration. The second spring deforms under the pressure of the base plate to further absorb the vibration, thereby realizing the shock absorbing function.

[0010] Preferably, the muffler box is provided with a plurality of equidistantly distributed muffler blocks, the muffler blocks are hollow inside, the surfaces of the muffler blocks are evenly distributed with holes, and muffler cotton is also provided inside the muffler blocks. Air enters the muffler blocks through the holes, and the muffler cotton absorbs the noise to achieve silencing.

[0011] Preferably, the diameter of the deceleration tube is larger than that of the air inlet tube, and a plurality of equally spaced wind shielding rings are arranged inside the deceleration tube, and a plurality of ventilation holes are evenly distributed on the surface of the wind shielding ring in the circumferential direction. When the air passes through the deceleration tube, it will be blocked by the wind shielding ring, thereby slowing down the flow rate and reducing the generation of noise.

[0012] The advantages of the utility model are as follows: (1) By providing a speed reducing pipe and a silencer box, the problem of poor silencing effect of silencers used in existing HVAC equipment is solved; the diameter of the speed reducing pipe is larger than the diameter of the air inlet pipe, which can slow down the air flow rate; the wind shielding ring can further block the air flow, reduce the flow rate, and reduce the noise generation; the air enters the silencer box and passes through the holes in the silencer block, and the silencer cotton absorbs the noise, thereby achieving a better silencing effect.

[0013] (2) By providing a shock-absorbing device, the problem that the existing silencers for HVAC equipment are not shock-resistant is solved. When the silencer vibrates, the sleeve will move on the connecting shaft to squeeze the first spring. The first spring will absorb part of the vibration, and the second spring will deform and vibrate further, thereby achieving a shock-absorbing function and preventing the silencer from vibrating and generating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a silencer for HVAC equipment of the utility model.

[0015] Figure 2 yes Figure 1 Schematic diagram of the structure of the medium reduction tube.

[0016] Figure 3 yes Figure 1 Schematic diagram of the structure of the center sound-absorbing box.

[0017] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle shock absorbing device.

[0018] Figure 5 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0019] In the figure, 1 is the air inlet pipe, 101 is the flange, 2 is the speed reduction pipe, 201 is the wind shield ring, 202 is the ventilation hole, 3 is the silencer box, 301 is the silencer block, 302 is the hole, 303 is the silencer cotton, 4 is the air guide pipe, 5 is the air outlet pipe, 6 is the fixing ring, 601 is the bracket, 602 is the bottom plate, 603 is the fixing seat, 604 is the buffer box, 7 is the shock absorbing device, 701 is the support column, 702 is the connecting shaft, 703 is the collar, 704 is the first spring, 705 is the damping rod, 706 is the second spring, and 707 is the rotating rod. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with embodiments and specific implementation methods.

[0021] like Figure 1 As shown, a silencer for HVAC equipment has a structure comprising an air inlet pipe 1, a speed reducing pipe 2, a silencer box 3, an air guide pipe 4 and an air outlet pipe 5 which are connected in sequence. A fixing ring 6 is provided on the outer surface of the air inlet pipe 1 and the air outlet pipe 5. The fixing ring 6 is connected to the outer wall through a fixing mechanism with a shock absorbing device 7. The air guide pipe 4 is in a tapered shape with the outer diameter gradually decreasing from the end close to the silencer box 3 to the end close to the air outlet pipe 5.

[0022] During operation, wind enters the muffler from the air inlet pipe 1. The speed reduction pipe 2 at the rear end of the air inlet pipe 1 can slow down the flow rate of the air and reduce the generation of noise. The muffler box 3 at the rear end of the speed reduction pipe 2 can absorb the noise in the air. The tapered air guide pipe 4 at the rear end of the muffler box 3 can prevent the friction between the air and the air guide pipe 4 from generating noise again. The air outlet pipe 5 at the rear end of the air guide pipe 4 is used to discharge the air.

[0023] The outer ends of the air outlet pipe 5 and the air inlet pipe 1 are respectively provided with flanges 101 to facilitate connection with the heating and ventilation ducts.

[0024] The fixing mechanism includes a bracket 601, a base plate 602, a fixing seat 603 and a buffer box 604. The bracket 601 is connected to both sides of the fixing ring 6 for supporting the muffler. The bottom end of the bracket 601 is connected to the base plate 602. The base plate 602 is connected to the buffer box 604 by sliding up and down. The base plate 602 can slide inside the buffer box 604 when subjected to pressure. The shock absorbing device 7 is arranged in the buffer box 604 to absorb the vibration generated by the muffler. The bottom of the buffer box 604 is connected to the fixing seat 603, and the fixing seat 603 is connected to the outer wall.

[0025] like Figure 4 As shown, the shock absorbing device 7 includes a support column 701, a connecting shaft 702, a collar 703, a first spring 704, a damping rod 705, a second spring 706 and a rotating rod 707. A total of two support columns 701 are respectively arranged on both sides of the bottom of the buffer box 604. The connecting shaft 702 is connected between the two support columns 701. A pair of collars 703 are slidably sleeved on the connecting shaft 702. The connecting shaft 702 between the two support columns 701 and the corresponding adjacent collars 703 is A first spring 704 is respectively sleeved on each of them, and the top of the support column 701 is connected to the bottom surface of the base plate 602 through a damping rod 705. A second spring 706 is sleeved on the damping rod 705, and the damping rod 705 can absorb the elastic potential energy of the second spring 706. The upper end of the ring 703 is hinged to the lower end of the rotating rod 707, and the upper ends of the rotating rods 707 on both sides are hinged to the center of the bottom surface of the base plate 602. The rotating rod 707 can rotate relative to the ring 703 and the base plate 602 when subjected to pressure.

[0026] When the silencer vibrates, the bracket 601 squeezes the bottom plate 602 and moves in the buffer box 604, the ring 703 moves on the connecting shaft 702 and then squeezes the first spring 704. The first spring 704 deforms to absorb part of the vibration, and the second spring 706 deforms due to the pressure of the bottom plate 602, further absorbing the vibration, thereby achieving a shock-absorbing function.

[0027] like Figure 3 , 5 As shown, three equidistantly distributed silencer blocks 301 are provided inside the silencer box 3. The silencer blocks 301 are hollow inside, and holes 302 are evenly distributed on the surface of the silencer blocks 301 to facilitate air to enter the silencer blocks 301. Silencing cotton 303 is also provided inside the silencer blocks 301.

[0028] The air enters the interior of the silencer block 301 through the hole 302, and the silencer cotton 303 absorbs the noise to achieve silencer.

[0029] like Figure 1 , 2As shown, the diameter of the speed reducer 2 is larger than that of the air inlet 1, which can slow down the air flow rate. Three equally spaced wind shielding rings 201 are arranged inside the speed reducer 2 to block the air flow. A plurality of ventilation holes 202 are evenly distributed in the circumferential direction on the surface of the wind shielding ring 201 to allow air to pass through, thereby avoiding excessive friction between the wind shielding ring 201 and the air and generating noise.

[0030] When the air passes through the speed reducing tube 2, it will be blocked by the wind shielding ring 201, thereby slowing down the flow speed and reducing the generation of noise.

[0031] When in use, the silencer is connected between the heating and ventilation ducts. When wind passes through, the wind shield ring 201 will block the air flow, thereby slowing down the flow rate and reducing the generation of noise. Then the air enters the silencer box 3, and the air enters the silencer block 301 through the hole 302. The silencer cotton 303 absorbs the noise to achieve silencing. Finally, the air is discharged through the air duct 4 and the air outlet duct 5. When the silencer vibrates, the bracket 601 will squeeze the bottom plate 602 to move in the buffer box 604, so that the ring 703 moves on the connecting shaft 702 and then squeezes the first spring 704. The first spring 704 will deform to absorb part of the vibration, and the second spring 706 will deform under the pressure of the bottom plate 602 to further absorb the vibration, thereby achieving a shock absorbing function and preventing noise. Example

[0032] The sound of a certain HVAC equipment is about 60-70 decibels within a 10-meter range. After using the silencer for HVAC equipment, the sound of the HVAC equipment in operation is about 20-30 decibels within a 10-meter range, and the sound is about 10 decibels when it exceeds 15 meters, with a significant noise reduction effect.

[0033] All the components mentioned above are prior art, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A muffler for HVAC equipment, characterized in that: The invention comprises an air inlet pipe (1), a speed reducing pipe (2), a muffler box (3), an air guide pipe (4) and an air outlet pipe (5) which are connected in sequence. The air inlet pipe (1) and the air outlet pipe (5) are provided with a fixing ring (6) on their outer surfaces. The fixing ring (6) is connected to an outer wall via a fixing mechanism with a shock absorbing device (7). The air guide pipe (4) is in a tapered shape with its outer diameter gradually decreasing from the end close to the muffler box (3) to the end close to the air outlet pipe (5).

2. A muffler for HVAC equipment according to claim 1, characterized in that: The outer ends of the air outlet pipe (5) and the air inlet pipe (1) are respectively provided with flange plates (101).

3. A muffler for HVAC equipment according to claim 1, characterized in that: The fixing mechanism comprises a bracket (601), a bottom plate (602), a fixing seat (603) and a buffer box (604); the bracket (601) is connected to both sides of the fixing ring (6); the bottom end of the bracket (601) is connected to the bottom plate (602); the bottom plate (602) is connected to the buffer box (604) by sliding up and down; the shock absorbing device (7) is arranged in the buffer box (604); the bottom of the buffer box (604) is connected to the fixing seat (603); and the fixing seat (603) is connected to the outer wall.

4. A muffler for HVAC equipment as claimed in claim 3, characterized in that: The shock absorbing device (7) comprises a support column (701), a connecting shaft (702), a collar (703), a first spring (704), a damping rod (705), a second spring (706) and a rotating rod (707). Two support columns (701) are respectively arranged on both sides of the bottom of the buffer box (604). The connecting shaft (702) is connected between the two support columns (701). A pair of collars (703) are slidably sleeved on the connecting shaft (702). A first spring (704) is sleeved on the connecting shaft (702) between the support column (701) and the corresponding adjacent ring (703), the top of the support column (701) is connected to the bottom surface of the base plate (602) through a damping rod (705), and a second spring (706) is sleeved on the damping rod (705). The upper end of the ring (703) is hinged to the lower end of the rotating rod (707), and the upper ends of the rotating rods (707) on both sides are hinged to the center of the bottom surface of the base plate (602).

5. A muffler for HVAC equipment according to claim 1, characterized in that: The muffler box (3) is provided with a plurality of equidistantly distributed muffler blocks (301); the muffler blocks (301) are hollow inside, holes (302) are evenly distributed on the surface of the muffler blocks (301), and muffler cotton (303) is also provided inside the muffler blocks (301).

6. A muffler for HVAC equipment according to claim 1, characterized in that: The diameter of the deceleration tube (2) is larger than that of the air inlet tube (1), a plurality of equally spaced wind shielding rings (201) are provided inside the deceleration tube (2), and a plurality of ventilation holes (202) are evenly distributed in the circumferential direction on the surface of the wind shielding ring (201).

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