Noise reduction and heat insulation device for air exhaust of air blower

Abstract

The utility model provides a noise reduction and heat insulation device for air exhaust of an air blower. The noise reduction and heat insulation device comprises a noise reduction shell and a noise reduction assembly connected between an air inlet and an air outlet of the noise reduction shell. Glass fiber cotton is filled between the silencing assembly and the silencing shell, a baffle is packaged in the silencing assembly, when sound wave heat flow exhausted by the air blower enters the silencing assembly through the guide connecting pipe, sound waves are diffused under the action of the baffle and are reflected and scattered by the through holes in the pipe wall to be attenuated in the process of impacting the silencing pipe, and therefore the silencing effect of the air blower is improved. Therefore, the working noise of the blower unit is effectively reduced. And the filled glass fiber cotton can effectively prevent the heat of the sound wave heat flow from spreading outwards to cause the temperature rise of the internal environment of the air blower set, and the effect of ensuring stable operation of equipment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of blowers, in particular to a silencer and heat insulator for exhaust of a blower. Background Art

[0002] The blower is mainly composed of an air compression volume chamber, a driving power source and an air flow channel. The air compression volume chamber is used as an actuator. When the main screw rotates, the gas enters the screw and the shell through the air flow channel to form an upper compression chamber. As the screw rotates, the gas is gradually transported and compressed to the lower part and discharged from the chamber. The high-speed rotating screw rotor in the blower compresses the gas to do work. During the loading, constant pressure and unloading processes, the friction of the rotor converts the motor electrical energy into mechanical energy, which will cause the airflow to carry a lot of noise and heat energy. Long-term noise pollution will cause physical and mental harm to workers. The heat energy generated will not only easily cause the internal ambient temperature of the machine body to rise, causing the motor to overheat, but also easily accelerate the aging of parts and reduce the energy efficiency of the equipment. Utility Model Content

[0003] The utility model aims to provide a sound-absorbing and heat-insulating device for blower exhaust, so as to reduce the noise generated by the blower outlet and control the internal temperature rise of the blower.

[0004] In order to solve the above-mentioned technical problems, the utility model provides a silencer and heat insulator for blower exhaust, comprising a silencer shell and a silencer assembly connected between the inlet and exhaust ports of the silencer shell, the silencer assembly comprising a silencer pipe group having a plurality of circumferential through holes opened on the outer wall, the silencer pipe group having a baffle encapsulated therein and an adsorption material wrapped thereon, the silencer pipe group being fixedly connected to the exhaust port of the blower through a guide pipe to form a channel for the transmission of sound wave airflow.

[0005] In a preferred embodiment, the silencer tube group includes a first silencer tube and a second silencer tube that are coaxially nested.

[0006] In a preferred embodiment: the circumferential through holes on the first muffler pipe and the through holes on the second muffler pipe are arranged in a staggered manner.

[0007] In a preferred embodiment: the end of the second silencer pipe abuts against the inner wall of the silencer shell, and is enclosed with the silencer shell to form a tubular space for accommodating the adsorption material.

[0008] In a preferred embodiment: one end of the guide tube is fixedly connected to the silencer shell, and the end of the first silencer pipe passes through the silencer shell and is interference-fitted with the guide tube.

[0009] In a preferred embodiment: the uniform distribution area of ​​the through holes is not less than 0.4 per square, and the diameter of a single hole is not less than 1 mm.

[0010] In a preferred embodiment: the adsorption material is glass fiber wool.

[0011] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0012] 1. The utility model provides a silencer and heat insulator for blower exhaust. Two coaxially nested silencer pipes are arranged in a silencer shell, and then connected to the exhaust pipe of the blower through a guide pipe. When the sound wave heat flow discharged by the blower enters the silencer pipe, the noise is reflected and scattered by the through holes on the pipe wall in the process of colliding with the silencer pipe and attenuated, thereby effectively reducing the working noise of the blower unit and improving the problem of large noise generated by the generator set in the related technology.

[0013] 2. The utility model provides a sound-absorbing and heat-insulating device for blower exhaust, which sets a glass fiber wool sleeve between a sound-absorbing pipe and a sound-absorbing shell, and sets a baffle in the sound-absorbing pipe. When the sound wave heat flow enters the sound-absorbing pipe, due to the obstruction of the inner baffle, the sound wave heat flow will be dissipated to the through holes at the peripheral position to achieve primary noise reduction. Then, the remaining sound wave heat flow contacts the glass fiber wool through the second sound-absorbing pipe to achieve secondary noise reduction. In addition, the glass fiber wool can effectively isolate the heat on the sound wave heat flow from propagating outward, causing the internal ambient temperature of the blower unit to increase, thereby maintaining the stable operation performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the appearance of an embodiment of the utility model;

[0015] Figure 2 yes Figure 1 Sectional view along AA position;

[0016] Figure 3 yes Figure 1 Axonometric view along the AA position;

[0017] Figure 4 yes Figure 3 Enlarged view at position B. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0021] refer to Figure 1-4 The present embodiment provides a sound-absorbing heat insulator for blower exhaust, which comprises a sound-absorbing shell 1, a guide pipe 12 connected to the inlet and outlet of the sound-absorbing shell 1, and a flange 121 connected to the exhaust port of the blower is provided on the guide pipe 12. A sound-absorbing assembly 11 is provided through the inside of the sound-absorbing shell 1, and both ends of the sound-absorbing assembly 11 are interference-fitted with the guide pipe 12. The sound-absorbing assembly 11 comprises a sound-absorbing pipe group with a plurality of circumferential through holes opened on the peripheral wall. Specifically, the silencer tube group includes a first silencer tube 111 and a second silencer tube 112 coaxially nested. The nested first silencer tube 111 is internally encapsulated with a baffle 110, and the through holes on the peripheral side thereof are staggered with the through holes on the second silencer tube 112 at the peripheral position, so that after the sound wave airflow from the blower exhaust port enters the silencer shell 1 through the guide tube 12, when it propagates along the through direction of the first silencer tube 111 to the position of the baffle 110, it is intercepted by the baffle 110 radially blocked on the first silencer tube 111, and the propagation direction is changed and evenly diverged to the surroundings, and the sound wave airflow is diverged by the baffle 110 to reduce the propagation intensity of the sound wave.

[0022] The sound wave airflow propagating along the axial direction is intercepted by the baffle 110 and diverges to the surroundings, and forms floccules after passing through the through hole on the first muffler 111. The continuous sound wave airflow is pushed into the cavity between the first muffler 111 and the second muffler 112 and gradually gathers. As the sound wave airflow increases, the airflow velocity and air pressure in the cavity also gradually increase. The high-speed airflow constantly impacts the inner wall of the cavity, which is not only not conducive to the elimination of noise, but the vibration generated by the impact will also increase the propagation potential energy of the noise sound wave. In view of this, the utility model arranges the through hole on the second muffler 112 and the through hole on the first muffler 111 in a staggered manner. Furthermore, since both ends of the second silencer pipe 112 are in contact with the inner wall of the silencer shell 11, it and the silencer shell 11 enclose a tubular accommodation space. The utility model fills the tubular accommodation space with an adsorption material 113 for eliminating noise and absorbing heat. Specifically, the adsorption material 113 is glass fiber wool with fluffy and interlaced internal fibers and a large number of tiny pores. The sonic airflow is diverted multiple times after passing through the through holes arranged in the first silencer pipe 111 and the second silencer pipe 112. The sonic potential energy of the sonic airflow is weakened after changing the propagation direction multiple times. The sound waves are reflected, scattered and absorbed by the holes arranged in the dislocation during the propagation process. The heat energy also forms a lower thermal conductivity under the influence of the porous structure propagation path. The noise energy and thermal potential energy are mutually depleted under the intervention of the holes to achieve first-order noise reduction. Subsequently, the uneliminated acoustic heat flow continues to enter the glass fiber wool through the second silencer pipe and fully contacts with the glass fiber wool. The acoustic energy and thermal potential energy it carries are adsorbed and blocked by the porous structure of the glass fiber wool. As a flexible material, glass fiber wool can play a good buffering role for the vibration generated during gas transmission, thereby further playing a sound-absorbing and heat-insulating effect to achieve second-order noise reduction and energy absorption, thereby effectively isolating the heat on the acoustic heat flow from propagating outward and causing the internal ambient temperature of the blower unit to increase, thereby maintaining stable operation of the equipment.

[0023] In addition, considering the propagation efficiency of the acoustic heat flow in the muffler tube group, it is necessary to ensure that the uniform distribution area of ​​the through holes on the first muffler tube 111 and the second muffler tube 112 is not less than 0.4, and the diameter of a single hole is not less than 1 mm.

[0024] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A sound-absorbing and heat-insulating device for blower exhaust, comprising a sound-absorbing shell (1) and a sound-absorbing assembly (11) connected between an inlet and an outlet of the sound-absorbing shell, characterized in that: The silencer assembly (11) comprises a silencer pipe group with a plurality of circumferential through holes formed on the outer wall, the silencer pipe group is encapsulated with a baffle (110) inside and is surrounded by an adsorption material (113) outside, and the silencer pipe group is fixedly connected to the exhaust port of the blower through a guide pipe (12) to form a channel for transmitting sound wave airflow.

2. A sound-absorbing and heat-insulating device for blower exhaust according to claim 1, characterized in that: The silencer pipe group comprises a first silencer pipe (111) and a second silencer pipe (112) which are coaxially nested.

3. A sound-absorbing and heat-insulating device for blower exhaust according to claim 2, characterized in that: The circumferential through holes on the first silencer pipe (111) and the through holes on the second silencer pipe (112) are arranged in a staggered manner.

4. A sound-absorbing and heat-insulating device for blower exhaust according to claim 2, characterized in that: The end of the second silencer pipe (112) abuts against the inner wall of the silencer shell (1), and is enclosed with the silencer shell (1) to form a tubular space for accommodating the adsorption material (113).

5. A sound-absorbing and heat-insulating device for blower exhaust according to claim 2, characterized in that: One end of the guide tube (12) is fixedly connected to the silencer shell (1), and the end of the first silencer tube (111) passes through the silencer shell (1) and is interference-fitted with the guide tube (12).

6. A sound-absorbing and heat-insulating device for blower exhaust according to claim 2, characterized in that: The adsorption material (113) is glass fiber wool.

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