Silencing device for heating ventilation air conditioner ventilation system

Abstract

The utility model relates to the technical field of heating ventilation air-conditioning ventilation systems, and discloses a silencing device for a heating ventilation air-conditioning ventilation system, which comprises an air inlet pipe, a ventilation pipe and an exhaust pipe, the ventilation pipe is positioned between the air inlet pipe and the exhaust pipe, the ventilation pipe is respectively communicated with the air inlet pipe and the exhaust pipe, and the exhaust pipe is communicated with the ventilation pipe. The cross section area of the air inlet pipe is smaller than that of the ventilation pipe, and the cross section area of the ventilation pipe is smaller than that of the exhaust pipe. The multi-section type design is adopted, the resistive silencer and the reactive silencer are combined, the reactive silencer reduces low-frequency noise through sudden change of the section of the pipeline, and the reactive silencer can cover a wider frequency range when used in cooperation with the resistive silencer, so that the silencing effect is improved, and the practicability of the device is further improved; and in addition, the silencing device further has a self-cleaning function, impurities accumulated in the silencing device can be conveniently and regularly cleaned and collected, and convenience is provided for cleaning work of workers.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, ventilation and air conditioning ventilation systems, in particular to a silencing device for heating, ventilation and air conditioning ventilation systems. Background Art

[0002] The HVAC system is a comprehensive system designed to provide heating, ventilation and air conditioning indoors or in a car. The working principle of the HVAC system mainly involves the circulation of refrigerant in the refrigeration unit. The refrigerant vaporizes by exchanging heat with chilled water in the evaporator, thereby reducing the temperature of the chilled water. Subsequently, it becomes a high-temperature and high-pressure gas under the action of the compressor, and is cooled by cooling water when flowing through the condenser, becoming a low-temperature and low-pressure liquid again. At the same time, the cooled chilled water is pumped to the heat exchanger of the air handling unit through a chilled water pump for heat exchange with the mixed air to form a cold air source, which is then sent to the conditioned room through the air supply duct. The current HVAC system will be equipped with a muffler, which can reduce the air flow velocity, reduce the generation of eddy currents and regenerative noise, thereby improving the aerodynamic performance and improving the system's operating efficiency. In addition to reducing noise, the muffler can also prevent the reflection and refraction of sound waves, reduce the generation of echoes, and protect the equipment from damage by harmful gases such as corrosion and cavitation.

[0003] The interior of the current muffler is composed of multiple plates with holes, and it mainly uses the principle of resistive sound absorption, that is, when sound waves enter the muffler, part of the sound energy is converted into heat energy and dissipated due to friction in the pores of the porous material, so that the sound waves passing through the muffler are weakened. This type of muffler is mainly effective in silencing mid- and high-frequency noise, but has a poor effect on low-frequency noise. In HVAC systems, low-frequency noise often accounts for a large proportion. Therefore, this simple sound absorption method may not achieve the ideal sound absorption effect in the low-frequency band. Moreover, after the current muffler has been used for a period of time, a certain amount of impurities will often accumulate inside it. These impurities will affect the performance of the muffler, resulting in a decrease in the sound absorption effect. When cleaning, the staff also needs to remove the entire muffler, and the cleaning process is more troublesome. Utility Model Content

[0004] The purpose of the utility model is to provide a silencing device for a heating, ventilation, air conditioning and ventilation system to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a silencer device for a heating, ventilation and air conditioning ventilation system, comprising an air inlet duct, a ventilation duct and an exhaust duct, the ventilation duct being located between the air inlet duct and the exhaust duct, and the ventilation duct being connected to the air inlet duct and the exhaust duct respectively, the cross-sectional area of ​​the air inlet duct being smaller than the cross-sectional area of ​​the ventilation duct, the cross-sectional area of ​​the ventilation duct being smaller than the cross-sectional area of ​​the exhaust duct, a silencer frame being fixed to the right side of the inner wall of the ventilation duct and the exhaust duct, and a plurality of air diffusion holes being provided on the four sides of the surface of the silencer frame, a movable frame being sleeved on the surface of the silencer frame, a cleaning brush being fixed on the surface of the inner wall of the movable frame, a fixing frame being fixed to the top of the air inlet duct and the ventilation duct, and a driving structure being provided inside the fixing frame, a mounting groove being provided at the bottom of the ventilation duct and the exhaust duct, a waste box being provided below the exhaust duct and the ventilation duct, and the waste box being slidably connected to the inner wall of the mounting groove, and a positioning structure being provided on the left side of the waste box.

[0006] Preferably, the driving structure includes a motor fixed to the right side of the inner wall of the fixed frame, a screw rod fixed to the left end of the motor output shaft, and a movable sleeve fixed to the upper right side of the movable frame, the right end of the movable sleeve respectively passes through the ventilation pipe and the exhaust pipe and extends to the interior of the fixed frame, and the left end of the screw rod extends to the interior of the movable sleeve and is threadedly connected to the inner wall of the movable sleeve.

[0007] Preferably, both front and rear sides of the fixing frame are provided with limiting grooves, and both front and rear right sides of the movable sleeve are fixed with limiting plates, and one side of the limiting plate extends into the interior of the limiting groove and is slidably connected to the inner wall of the limiting groove.

[0008] Preferably, the positioning structure includes a mounting frame, a slot, a clamping plate and a spring, the mounting frame is fixed to the bottom of the ventilation duct and the exhaust duct and is located on the left side of the mounting slot, the slot is opened on the left side of the waste box, the clamping plate is slidably connected to the inside of the mounting frame, and the right side of the clamping plate extends to the inside of the slot and is slidably connected to the inner wall of the slot, the spring is fixed to the front and rear of the left side of the inner wall of the mounting frame, and the other end of the spring is fixedly connected to the surface of the clamping plate.

[0009] Preferably, guide grooves are provided on both the front and rear sides of the inner wall of the mounting frame, and guide blocks slidably connected to the inner wall of the guide groove are fixed on the left sides of the front and rear sides of the clamping plate.

[0010] Preferably, a guide plate is fixed to the left side of the bottom of the inner wall of the exhaust pipe and the ventilation pipe, and the surface above the guide plate is inclined.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] The utility model adopts a multi-stage design, combining a resistive silencer and a reactive silencer. The reactive silencer reduces low-frequency noise by a sudden change in the pipe cross-section. When used in conjunction with a resistive silencer, it can cover a wider frequency range to improve the silencer effect, further improving the practicality of the device. The silencer also has a self-cleaning function, which is convenient for regular cleaning and collection of impurities accumulated inside, providing convenience for the cleaning work of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 It is a three-dimensional structural schematic diagram of another viewing angle of the utility model;

[0015] Figure 3 It is a three-dimensional structural schematic diagram of another viewing angle of the utility model;

[0016] Figure 4 It is a cross-sectional view of the ventilation pipe in the utility model;

[0017] Figure 5 It is a three-dimensional schematic diagram of the driving structure in the utility model;

[0018] Figure 6 It is a three-dimensional schematic diagram of the positioning structure in the utility model;

[0019] Figure 7 For this utility model Figure 5 A partial enlarged view of point A in the middle.

[0020] In the figure: 1. air inlet pipe; 2. ventilation pipe; 3. exhaust pipe; 4. silencer frame; 5. air diffusion hole; 6. movable frame; 7. cleaning brush; 8. fixed frame; 9. driving structure; 91. motor; 92. screw rod; 93. movable sleeve; 10. mounting slot; 11. waste box; 12. positioning structure; 121. mounting frame; 122. slot; 123. clamping plate; 124. spring; 13. guide plate; 14. limit slot; 15. limit plate; 16. guide slot; 17. guide block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-7As shown, a silencer device for a heating, ventilation and air conditioning ventilation system comprises an air inlet duct 1, a ventilation duct 2 and an exhaust duct 3, the ventilation duct 2 is located between the air inlet duct 1 and the exhaust duct 3, and the ventilation duct 2 is respectively connected to the air inlet duct 1 and the exhaust duct 3, and the surfaces of one side of the air inlet duct 1 and the exhaust duct 3 are fixed with mounting plates for connecting and installing the silencer device, and the surface of the mounting plates is provided with a plurality of screw holes, the cross-sectional area of ​​the air inlet duct 1 is smaller than the cross-sectional area of ​​the ventilation duct 2, and the cross-sectional area of ​​the ventilation duct 2 is smaller than the cross-sectional area of ​​the exhaust duct 3, a silencer frame 4 is fixed to the right side of the inner wall of the ventilation duct 2 and the exhaust duct 3, and a plurality of air diffusion holes 5 are provided on the four sides of the surface of the silencer frame 4, the volume of the silencer frame 4 inside the exhaust duct 3 is larger than the volume of the silencer frame 4 inside the ventilation duct 2, and the air diffusion holes 5 are The spacing between them is the same, a movable frame 6 is sleeved on the surface of the silencer frame 4, and the movable frame 6 is respectively arranged on the right side of the exhaust duct 3 and the ventilation duct 2, and the size of the movable frames 6 on both sides is adapted to the size of the silencer frame 4 inside the exhaust duct 3 and the ventilation duct 2, a cleaning brush 7 is fixed on the surface of the inner wall of the movable frame 6, a fixed frame 8 is fixed on the top of the air inlet duct 1 and the ventilation duct 2, and a driving structure 9 is arranged inside the fixed frame 8, and mounting grooves 10 are provided at the bottom of the ventilation duct 2 and the bottom of the exhaust duct 3, and the lengths of the mounting grooves 10 on both sides are adapted to the sizes of the exhaust duct 3 and the ventilation duct 2, a waste box 11 is arranged under the exhaust duct 3 and the ventilation duct 2, and the waste box 11 is slidably connected to the inner wall of the mounting groove 10, and a positioning structure 12 is arranged on the left side of the waste box 11.

[0023] The driving structure 9 includes a motor 91, a screw rod 92 and a movable sleeve 93. The motor 91 is fixed to the right side of the inner wall of the fixed frame 8, the screw rod 92 is fixed to the left end of the output shaft of the motor 91, the movable sleeve 93 is fixed above the right side of the movable frame 6, and the right end of the movable sleeve 93 respectively penetrates the ventilation pipe 2 and the exhaust pipe 3 and extends to the inside of the fixed frame 8, the left end of the screw rod 92 extends to the inside of the movable sleeve 93 and is threadedly connected to the inner wall of the movable sleeve 93, the front and rear sides of the fixed frame 8 are provided with limiting grooves 14, the right sides of the front and rear sides of the movable sleeve 93 are fixed with limiting plates 15, and one side of the limiting plate 15 extends to the inside of the limiting groove 14 The movable sleeve 93 is pushed by the movable frame 6 on one side to move, so that the movable frame 6 can clean the surface of the muffler frame 4 through the cleaning brush 7 on its inner wall to avoid excessive impurities affecting the muffler effect.

[0024] The positioning structure 12 includes a mounting frame 121, a slot 122, a card plate 123 and a spring 124. The mounting frame 121 is fixed to the bottom of the ventilation pipe 2 and the exhaust pipe 3 and is located on the left side of the mounting slot 10. The slot 122 is opened on the left side of the waste box 11. The card plate 123 is slidably connected to the inside of the mounting frame 121, and the right side of the card plate 123 extends to the inside of the slot 122 and is slidably connected to the inner wall of the slot 122. The spring 124 is fixed to the front and rear of the left side of the inner wall of the mounting frame 121, and the other end of the spring 124 is fixedly connected to the surface of the card plate 123. In order to facilitate the staff to pull the card plate 123 from below to move left and right, a paddle is installed on the left side of the bottom of the card plate 123. The staff can move the card plate 123 to the left by pulling the paddle. The guide blocks 17 are fixed to the left sides of the front and rear sides of the card plate 123, and the guide blocks 17 are located inside the guide grooves 16 and are slidably connected to the inner walls of the guide grooves 16. When the staff needs to take out the waste box 11, they can pull the card plate 123 to the left, thereby moving the card plate 123 to the left and squeezing the spring 124. The guide blocks 17 on both sides can guide the card plate 123 so that the card plate 123 can only move horizontally left and right. After the card plate 123 is moved out of the card slot 122, the staff pulls down the waste box 11 to move the waste box 11 out of the mounting slot 10, so that the staff can uniformly process the impurities collected in the waste box 11.

[0025] A guide plate 13 is fixed to the left side of the bottom of the inner wall of the exhaust duct 3 and the ventilation duct 2. The lengths of the left and right guide plates 13 are adapted to the sizes of the exhaust duct 3 and the ventilation duct 2, and the surface above the guide plate 13 is inclined. When the movable frame 6 moves to the left to clean the dust on the surface of the muffler frame 4, the fallen dust will contact the guide plate 13 below, and the guide plate 13 can guide the dust so that the dust slides into the waste box 11 below for subsequent cleaning by the staff.

[0026] Working principle: After the silencer device and the pipeline are installed, the air enters the silencer device from the air inlet pipe 1 and moves to the inside of the ventilation pipe 2. At this time, after the air in the air inlet pipe 1 enters the inside of the ventilation pipe 2, since the space inside the air inlet pipe 1 is smaller than the space inside the ventilation pipe 2, the air flow speed will slow down accordingly due to the sudden increase in cross-sectional area. When the sound wave enters a large space from a small space, it will diffuse due to the expansion of the space, resulting in a decrease in the sound energy density, thereby weakening the propagation intensity of the sound wave, and then reducing the noise generated by the air flow. When the airflow entering the ventilation pipe 2 contacts the air diffusion holes 5 on the surface of the silencer frame 4 inside the ventilation pipe 2, it will be dispersed and absorbed, thereby further reducing the noise level. After the initial noise reduction and silencing, the air entering the ventilation pipe 2 will continue to move to the exhaust pipe 3 with a larger internal space. When the airflow inside the ventilation pipe 2 enters the exhaust pipe 3, the airflow is silenced again through the space inside the exhaust pipe 3. The air diffusion holes 5 on the surface of the silencer frame 4 inside the exhaust pipe 3 disperse the air flow again, thereby completing the silencer operation, and then the air will be discharged from the left side of the exhaust pipe 3. After the silencer device has been used for a period of time, the staff can turn on the motors 91 on both sides, so that the movable sleeve 93 pushes the movable frame 6 to move on the surface of the silencer frame 4, and the dust and impurities on the four sides of the surface of the silencer frame 4 are cleaned to the left by the cleaning brush 7 on the inner wall surface of the movable frame 6. Finally, the impurities are guided by the guide plate 13 and enter the waste box 11 below. After cleaning, the movable frame 6 returns to its original position, and the staff can pull the card plate 123 to the left, and then the waste box 11 can be removed from the bottom of the ventilation pipe 2 and the exhaust pipe 3, and the impurities collected in the waste box 11 are cleaned. After the cleaning is completed, the staff will install the waste box 11 back to the bottom of the ventilation pipe 2 and the exhaust pipe 3 again, and then the silencer device can continue to perform the silencer operation.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A silencing device for a heating, ventilation and air conditioning ventilation system, comprising an air inlet pipe (1), a ventilation pipe (2) and an exhaust pipe (3), characterized in that: The ventilation pipe (2) is located between the air inlet pipe (1) and the air exhaust pipe (3), and the ventilation pipe (2) is respectively connected to the air inlet pipe (1) and the air exhaust pipe (3); the cross-sectional area of ​​the air inlet pipe (1) is smaller than the cross-sectional area of ​​the ventilation pipe (2); the cross-sectional area of ​​the ventilation pipe (2) is smaller than the cross-sectional area of ​​the air exhaust pipe (3); a muffler frame (4) is fixed on the right side of the inner wall of the ventilation pipe (2) and the air exhaust pipe (3); a plurality of air diffusion holes (5) are provided on four sides of the surface of the muffler frame (4); a movable frame (6) is sleeved on the surface of the muffler frame (4); A cleaning brush (7) is fixed on the surface of the inner wall of the movable frame (6); a fixing frame (8) is fixed on the top of the air inlet pipe (1) and the ventilation pipe (2); a driving structure (9) is arranged inside the fixing frame (8); a mounting groove (10) is provided at the bottom of the ventilation pipe (2) and the bottom of the exhaust pipe (3); a waste box (11) is arranged below the exhaust pipe (3) and the ventilation pipe (2); the waste box (11) is slidably connected to the inner wall of the mounting groove (10); a positioning structure (12) is arranged on the left side of the waste box (11).

2. A muffler device for a HVAC system according to claim 1, characterized in that: The driving structure (9) comprises a motor (91) fixed to the right side of the inner wall of the fixed frame (8), a screw rod (92) fixed to the left end of the output shaft of the motor (91), and a movable sleeve (93) fixed to the upper right side of the movable frame (6); the right end of the movable sleeve (93) respectively passes through the ventilation pipe (2) and the exhaust pipe (3) and extends to the inside of the fixed frame (8); the left end of the screw rod (92) extends to the inside of the movable sleeve (93) and is threadedly connected to the inner wall of the movable sleeve (93).

3. A muffler device for a HVAC system according to claim 2, characterized in that: The fixing frame (8) is provided with limiting grooves (14) on both the front and rear sides, and the movable sleeve (93) is fixed with limiting plates (15) on the right sides of the front and rear sides, and one side of the limiting plate (15) extends into the interior of the limiting groove (14) and is slidably connected to the inner wall of the limiting groove (14).

4. A muffler device for a HVAC system according to claim 1, characterized in that: The positioning structure (12) comprises a mounting frame (121), a slot (122), a clamping plate (123) and a spring (124); the mounting frame (121) is fixed to the bottom of the ventilation pipe (2) and the exhaust pipe (3) and is located on the left side of the mounting frame (10); the clamping slot (122) is opened on the left side of the waste box (11); the clamping plate (123) is slidably connected to the inside of the mounting frame (121); the right side of the clamping plate (123) extends to the inside of the slot (122) and is slidably connected to the inner wall of the slot (122); the spring (124) is fixed to the front and rear of the left side of the inner wall of the mounting frame (121); and the other end of the spring (124) is fixedly connected to the surface of the clamping plate (123).

5. A muffler device for a HVAC system according to claim 4, characterized in that: The front and rear sides of the inner wall of the mounting frame (121) are provided with guide grooves (16), and the left sides of the front and rear sides of the clamping plate (123) are fixed with guide blocks (17) slidably connected to the inner wall of the guide groove (16).

6. A silencing device for a HVAC system according to claim 1, characterized in that: A guide plate (13) is fixed on the left side of the bottom of the inner wall of the exhaust pipe (3) and the ventilation pipe (2), and the surface above the guide plate (13) is arranged in an inclined manner.

Images