Straight-through type exhaust noise reduction device

Abstract

The utility model discloses a straight-through type exhaust noise reduction device which comprises a bottom plate, an outer cylinder, a first exhaust resistance body and a second exhaust resistance body, the first exhaust resistance body and the second exhaust resistance body are arranged in the outer cylinder, an outer cylinder flange is arranged at the lower end of the outer cylinder and connected with the bottom plate, a plurality of air inlet through holes are formed in the bottom plate and communicated with the lower end of the first exhaust resistance body, and a plurality of partition plates are arranged in the first exhaust resistance body. A partition plate through hole is formed in the middle of each partition plate, the two ends of each partition plate are bent upwards, vortex areas are formed below the two ends of each partition plate, a plurality of top plate through holes are formed in the first resistance body top plate, a plurality of second resistance body through holes are formed in the pipe wall of the second exhaust resistance body, and the lower end of the second exhaust resistance body is connected with the upper end of the first exhaust resistance body. Balance between noise reduction and air circulation capacity can be achieved by adjusting the hole diameter of each through hole, meanwhile, due to the fact that all the through holes are integrated in the outer cylinder, the problem that the through holes are blocked by air dust is avoided, and exhaust flow resistance does not change along with time and environment.

Description

Technical Field

[0001] The utility model relates to an exhaust noise reduction device, in particular to a straight-through exhaust noise reduction device mainly used for oxygen production equipment. Background Art

[0002] When high-pressure gas is suddenly released, high-decibel noise will be generated. For example, the oxygen production process and nitrogen exhaust process of the onboard oxygen production equipment that uses the pressure swing adsorption principle are cycled alternately. In the nitrogen exhaust process, the pressure of the high-pressure nitrogen is suddenly released when it is discharged. Without noise reduction treatment, the noise generated can be as high as 110dB, which will have a great impact on the hearing of the users.

[0003] At present, the traditional noise reduction method for the noise problem generated by the nitrogen exhaust process of airborne oxygen production equipment is to reduce the noise by filling the exhaust end with porous adsorption materials. Commonly used fillers include porous sound-absorbing cotton, metal sintered copper mesh, etc., which use the friction and viscous resistance between the airflow and the porous structure to convert the kinetic energy of the airflow into heat energy, thereby achieving the effect of noise reduction.

[0004] The above-mentioned traditional noise reduction method has the following defects: on the one hand, the porous structure exposed to the air is easily blocked by dust and impurities in the air, resulting in increased exhaust resistance, which may eventually cause the nitrogen to be unable to be discharged in time and re-participate in the next pressurized adsorption cycle, which will reduce the oxygen production efficiency and oxygen concentration; on the other hand, because there is no effective guidance of the airflow, it is difficult to achieve a good noise reduction effect, and it is even more difficult to take into account both the noise reduction effect and the purpose of smooth exhaust. Utility Model Content

[0005] The purpose of the utility model is to provide a straight-through exhaust noise reduction device which will not be blocked by air dust and has good noise reduction effect in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A straight-through exhaust noise reduction device comprises an outer cylinder and an exhaust resistance body arranged in the outer cylinder, and also comprises a bottom plate, the exhaust resistance body comprises a first exhaust resistance body and a second exhaust resistance body, with the axial direction of the outer cylinder being the vertical direction, the lower end of the outer cylinder is provided with an outer cylinder flange that is convex, the horizontal bottom plate is placed below the outer cylinder flange and is connected to each other, a plurality of vertical air intake holes are provided on the bottom plate and the air intake holes serve as the air intake end of the straight-through exhaust noise reduction device, the upper end of the first tubular and vertically through exhaust resistance body is provided with a first resistance body top plate and a lower end opening, the tube wall of the first exhaust resistance body is a hollow structure that is hollowed out except for a connecting bracket, a plurality of partitions distributed up and down are provided in the first exhaust resistance body, the A vertically penetrating partition through hole is provided in the middle of the partition, and the two ends of the partition are bent upward to form a vortex area below each of the two ends of the partition. The first exhaust resistor is installed on the bottom plate and its lower end is connected to the multiple air inlet through holes. The top plate of the first resistor is provided with multiple vertical top plate through holes. The outer diameter of the tubular and vertically penetrating second exhaust resistor is smaller than the outer diameter of the first exhaust resistor. The tube wall of the second exhaust resistor is provided with multiple second resistor through holes that penetrate inside and outside. The lower end of the second exhaust resistor is connected to the upper end of the first exhaust resistor. The second exhaust resistor is located in the upper section of the outer tube. The upper end of the outer tube is open and serves as the outlet end of the straight-through exhaust noise reduction device.

[0008] Preferably, in order to achieve better noise reduction effect, a first barrier connecting tube protruding upward is provided in the middle of the first barrier top plate, a second barrier bottom plate is provided at the lower end of the second exhaust barrier, a second barrier connecting tube protruding downward and connected with the interior of the second exhaust barrier is provided in the middle of the lower side of the second barrier bottom plate, a plurality of connecting tube through holes which pass through inside and outside are provided on the wall of the second barrier connecting tube, the length of the second barrier connecting tube is greater than that of the first barrier connecting tube, the lower section of the second barrier connecting tube is placed in the first barrier connecting tube, and a reflection interference cavity is formed in the outer tube, which is located above the first barrier top plate, below the second barrier bottom plate and outside the first barrier connecting tube.

[0009] Preferably, in order to achieve a better noise reduction effect, the outer diameter of the upper section of the outer cylinder is smaller than the outer diameter of the lower section, the outer wall of the upper section of the outer cylinder is provided with a plurality of circles of retaining rings to form an outer cylinder connecting section, the second exhaust resistance body is located in the outer cylinder connecting section, the outer wall of the second exhaust resistance body is provided with a plurality of diamond-shaped protrusions and forms a plurality of mutually staggered ventilation grooves, and a plurality of the second resistance body through holes are respectively arranged at the bottom of the corresponding ventilation grooves or on the corresponding diamond-shaped protrusions.

[0010] Preferably, in order to achieve a better sealing effect, the upper end of the outer tube protrudes inward to form a retaining ring, the upper end of the second exhaust resistance body is located below the retaining ring and is blocked by the retaining ring, a first annular sealing gasket is provided between the upper end of the second exhaust resistance body and the retaining ring, and an annular groove is provided on the outer wall of the lower end of the first exhaust resistance body and a second annular sealing gasket is provided in the annular groove.

[0011] The beneficial effects of the utility model are:

[0012] The utility model designs a base plate, an outer cylinder, a first exhaust resistance body and a second exhaust resistance body that cooperate with each other, and utilizes the first exhaust resistance body and the second exhaust resistance body to guide and diffuse the high-pressure gas, so that the gas expands, decelerates and forms eddy dissipation in the eddy region, and finally the speed, pressure and noise generated by the exhaust gas are greatly reduced, and the balance between noise reduction and gas flow capacity can be achieved by adjusting the aperture of each through hole. At the same time, because all are integrated in the outer cylinder, the problem of air dust clogging the through holes is avoided, and the exhaust flow resistance does not change with time or environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional exploded view of the straight-through exhaust noise reduction device of the utility model before assembly;

[0014] Figure 2 This is a stereoscopic diagram of the straight-through exhaust noise reduction device of the utility model after assembly;

[0015] Figure 3 This is a front cross-sectional view of the straight-through exhaust noise reduction device of the utility model after assembly;

[0016] Figure 4 It is a front cross-sectional view of a first exhaust block and a second exhaust block of the straight-through exhaust noise reduction device of the utility model after being connected. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] like Figure 1-Figure 4As shown, the straight-through exhaust noise reduction device of the utility model comprises a bottom plate 16, an outer cylinder 20, and a first exhaust resistance body 11 and a second exhaust resistance body 2 placed in the outer cylinder 20, the axial direction of the outer cylinder 20 is vertical, and the lower end of the outer cylinder 20 is provided with an outer cylinder flange 21 that bulges outwards, the transverse bottom plate 16 is placed below the outer cylinder flange 21 and is connected to each other, a plurality of vertical air intake holes 17 are provided on the bottom plate 16, and the air intake holes 17 serve as the air intake end of the straight-through exhaust noise reduction device, the upper end of the tubular and vertically through first exhaust resistance body 11 is provided with a first resistance body top plate 9, and the lower end is open, the pipe wall of the first exhaust resistance body 11 is a hollow structure that is hollowed out except for the connecting bracket, and a plurality of partitions 12 distributed up and down are provided in the first exhaust resistance body 11 A vertically penetrating partition through hole 13 is provided in the middle of the partition 12, and the two ends of the partition 12 are bent upward, and a vortex area 14 is formed below the two ends of each partition 12. The first exhaust block 11 is installed on the bottom plate 16 and its lower end is connected with a plurality of air inlet through holes 17. A plurality of vertical top plate through holes 10 are provided on the first block top plate 9. The outer diameter of the tubular and vertically penetrating second exhaust block 2 is smaller than the outer diameter of the first exhaust block 11. A plurality of second block through holes 5 penetrating inside and outside are provided on the tube wall of the second exhaust block 2. The lower end of the second exhaust block 2 is connected to the upper end of the first exhaust block 11. The second exhaust block 2 is located in the upper section of the outer tube 20. The upper end of the outer tube 20 is open and serves as the outlet end of the straight-through exhaust noise reduction device.

[0019] like Figure 1-Figure 4 As shown, the utility model also discloses the following more optimized specific structures:

[0020] In order to achieve better noise reduction effect, a first barrier connecting tube 8 protruding upward is provided in the middle of the first barrier top plate 9, a second barrier bottom plate (not marked in the figure) is provided at the lower end of the second exhaust barrier 2, a second barrier connecting tube 7 protruding downward and connected with the interior of the second exhaust barrier 2 is provided in the middle of the lower side of the second barrier bottom plate, a plurality of connecting tube through holes 6 which pass through inside and outside are provided on the wall of the second barrier connecting tube 7, the length of the second barrier connecting tube 7 is greater than that of the first barrier connecting tube 8, the lower section of the second barrier connecting tube 7 is placed in the first barrier connecting tube 8, and a reflection interference cavity 22 is formed in the outer tube 20 above the first barrier top plate 9, below the second barrier bottom plate and outside the first barrier connecting tube 8.

[0021] In order to achieve a better noise reduction effect, the outer diameter of the upper section of the outer cylinder 20 is smaller than the outer diameter of the lower section. The outer wall of the upper section of the outer cylinder 20 is provided with multiple circles of clamping rings to form an outer cylinder connecting section 19. The second exhaust resistance body 2 is located in the outer cylinder connecting section 19. The outer wall of the second exhaust resistance body 2 is provided with a plurality of diamond-shaped protrusions 3 and forms a plurality of mutually staggered ventilation grooves 4. The plurality of second resistance body through holes 5 are respectively arranged at the bottom of the corresponding ventilation grooves 4 or on the corresponding diamond-shaped protrusions 3.

[0022] In order to achieve a better sealing effect, the upper end of the outer tube 20 protrudes inward to form a retaining ring 18, the upper end of the second exhaust resistance body 2 is located below the retaining ring 18 and is blocked by the retaining ring 18, and a first annular sealing gasket 1 is provided between the upper end of the second exhaust resistance body 2 and the retaining ring 18, and an annular groove is provided on the outer wall of the lower end of the first exhaust resistance body 11 and a second annular sealing gasket 15 is provided in the annular groove.

[0023] like Figure 1-Figure 4 As shown, when in use, the bottom plate 16 is installed on the exhaust component, and the multiple air intake holes 17 are connected to the exhaust port of the exhaust component. For example, it is installed on the nitrogen exhaust component of the oxygen production equipment, and the multiple air intake holes 17 are connected to the nitrogen exhaust interface to start exhaust. The process of achieving noise reduction exhaust through this device is roughly as follows:

[0024] After the high-pressure gas is released instantly, the sonic airflow directly enters the first exhaust block 11 through the multiple air inlet holes 17. During this period, when the gas passes through the baffle holes 13 on the baffle 12 of the first exhaust block 11, due to the sudden increase in the cross-sectional area of ​​the flow channel, the airflow will expand and diverge to the surroundings, and under the guidance of the baffle 12, it will flow back in the vortex area 14 to form a vortex. After the friction of the airflow, the noise is converted into heat energy and consumed in the form of heat radiation; then the gas is discharged from the multiple top plate holes 11 on the top plate 9 of the first block 11 at the upper end of the first exhaust block 11. 0 enters the reflection interference chamber 22 and the second resistance body connecting tube 7 respectively. The gas in the second resistance body connecting tube 7 will also enter the reflection interference chamber 22 through the connecting tube through hole 6, forming the convergence and interference of two airflows, consuming energy. Under the action of pressure, the gas in the reflection interference chamber 22 enters the second exhaust resistance body 2 through the ventilation grooves 4 on the second exhaust resistance body 2 and the second resistance through holes 5 respectively. The gas will be interfered and dissipated at the intersection of each ventilation groove 4. Finally, the gas is discharged from the upper end of the second exhaust resistance body 2 to complete the noise reduction exhaust.

[0025] The above gas flow only describes the main flow of the gas. Some gases flow according to the actual gas flow holes, which will not be described in detail here.

[0026] The essential source of noise is the sudden expansion of high-pressure gas. This exhaust noise reduction device uses the principle that the gas cross-sectional area suddenly increases and then expands and decelerates. By designing multiple baffles and forming multiple vortex areas 14, the high-pressure and high-speed gas is continuously expanded and decelerated, and the two airflows are converged and interfered through the reflection interference cavity 22, consuming energy. Finally, the second exhaust baffle 2 with a honeycomb structure is rectified and evenly ejected, greatly reducing the noise generated by the instantaneous emission of high-pressure gas. Taking the oxygen concentrator carried by a certain type of helicopter as an example, when the exhaust noise reduction device is not installed, the peak value of the exhaust noise can reach 110dB. After installing the exhaust noise reduction device, the peak value of the exhaust noise drops to 79dB without affecting the terminal oxygen concentration, greatly reducing the exhaust noise.

[0027] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A straight-through exhaust noise reduction device, comprising an outer cylinder and an exhaust resistance body disposed in the outer cylinder, characterized in that: The exhaust block also includes a first exhaust block and a second exhaust block. The outer tube is vertically axially disposed at the lower end thereof and is provided with an outwardly convex outer tube flange. The transverse bottom plate is disposed below the outer tube flange and is connected to each other. A plurality of vertical air intake holes are provided on the bottom plate and the air intake holes serve as the air intake end of the straight-through exhaust noise reduction device. The first exhaust block, which is tubular and vertically penetrated, is provided with a first block top plate at the upper end and an opening at the lower end. The tube wall of the first exhaust block is a hollow structure which is hollowed out except for the connecting bracket. A plurality of partitions distributed up and down are provided in the first exhaust block, and a vertically penetrated partition hole is provided in the middle of the partition. Hole, the two ends of the partition are bent upward, and a vortex area is formed below each of the two ends of the partition, the first exhaust resistance body is installed on the bottom plate and the lower end thereof is connected with the multiple air inlet through holes, the top plate of the first resistance body is provided with a plurality of vertical top plate through holes, the outer diameter of the tubular and vertically through-through second exhaust resistance body is smaller than the outer diameter of the first exhaust resistance body, and the tube wall of the second exhaust resistance body is provided with a plurality of second resistance body through holes that pass through inside and outside, the lower end of the second exhaust resistance body is connected to the upper end of the first exhaust resistance body, the second exhaust resistance body is located in the upper section of the outer cylinder, the upper end of the outer cylinder is open and serves as the outlet end of the straight-through exhaust noise reduction device.

2. The straight-through exhaust noise reduction device according to claim 1 is characterized in that: A first barrier connecting tube protruding upward is provided in the middle of the first barrier top plate, a second barrier bottom plate is provided at the lower end of the second exhaust barrier, a second barrier connecting tube protruding downward and connected with the interior of the second exhaust barrier is provided in the middle of the lower side of the second barrier bottom plate, a plurality of connecting tube through holes which pass through inside and outside are provided on the tube wall of the second barrier connecting tube, the length of the second barrier connecting tube is greater than that of the first barrier connecting tube, the lower section of the second barrier connecting tube is placed in the first barrier connecting tube, and a reflection interference cavity is formed in the area above the first barrier top plate, below the second barrier bottom plate and outside the first barrier connecting tube in the outer tube.

3. The straight-through exhaust noise reduction device according to claim 1 or 2, characterized in that: The outer diameter of the upper section of the outer cylinder is smaller than the outer diameter of the lower section. The outer wall of the upper section of the outer cylinder is provided with multiple circles of clamping rings to form an outer cylinder connecting section. The second exhaust resistance body is located in the outer cylinder connecting section. The outer wall of the second exhaust resistance body is provided with multiple diamond-shaped protrusions and forms multiple mutually staggered ventilation grooves. The multiple second resistance body through holes are respectively arranged at the bottom of the corresponding ventilation grooves or on the corresponding diamond-shaped protrusions.

4. The straight-through exhaust noise reduction device according to claim 1 or 2, characterized in that: The upper end of the outer cylinder protrudes inward to form a retaining ring, the upper end of the second exhaust resistance body is located below the retaining ring and is blocked by the retaining ring, a first annular sealing gasket is provided between the upper end of the second exhaust resistance body and the retaining ring, and an annular groove is provided on the outer wall of the lower end of the first exhaust resistance body and a second annular sealing gasket is provided in the annular groove.

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