Device for reducing low-frequency noise of water pump of heat exchange station and working method of device

Abstract

The invention discloses a device for reducing low-frequency noise of a water pump of a heat exchange station and a working method thereof.The structure of the device comprises the water pump, a coupler, a water pump acoustic enclosure, a noise reduction cavity and a magnetic device, the noise reduction cavity is arranged in an inner cavity of the water pump acoustic enclosure, and the coupler is connected with the magnetic device; the water pump acoustic shield comprises an acoustic shield outer baffle, an acoustic shield inner baffle, an acoustic shield lower baffle and an acoustic shield upper baffle, a plurality of noise reduction micropores are formed in the side wall of the acoustic shield inner baffle, and diatom ooze coatings are laid on the acoustic shield outer baffle and the acoustic shield inner baffle respectively, so that the outward propagation resistance of low-frequency noise can be effectively increased; the water pump noise power is reduced. The noise reduction micropores and the noise reduction cavity are formed in the acoustic shield, and a traditional single-layer material is replaced with a multi-layer sound insulation material, so that the structure of the acoustic shield is designed according to a sound transmission rule, the noise transmission rate can be reduced, penetration of sound waves is avoided, the sound insulation effect is improved, and therefore low-frequency noise of all frequency bands is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange station water pump noise reduction, and in particular to a device for reducing low-frequency noise of a heat exchange station water pump and a working method thereof. Background Art

[0002] The water pump of the heat exchange station is the main source of low-frequency noise in the heat exchange station. Taking the ISG150-315 water pump as an example, its motor rated speed is 1480r / min, and the main shaft rated speed is 450r / min. After noise spectrum analysis, it is found that the noise frequency generated by the bearing is between 200 and 400Hz, and the noise frequency generated by the motor is between 20 and 200Hz. The maximum sound pressure level and the second highest sound pressure level both appear in the low frequency band below 200Hz. Compared with high-frequency noise, low-frequency noise has the characteristics of long propagation distance and slow attenuation, which interferes with the sleep of users around the heat exchange station and affects the health and quality of life of residents. Therefore, reducing the low-frequency noise of the water pump of the heat exchange station has become an urgent problem to be solved.

[0003] A Chinese patent with publication number CN 110327644 A discloses a combined soundproof enclosure for a circulating water pump, and optimizes the structure of the soundproof enclosure. However, due to the limitation of the arrangement of the soundproof enclosure components, the following problems exist: although the heat dissipation window of the circulating water pump box is conducive to the heat dissipation of the water pump, the size of the opening will directly affect the sound insulation effect of the soundproof enclosure; sound-absorbing cotton is arranged inside the maintenance door of the soundproof enclosure to absorb the noise generated when the circulating water pump is working, but it only has a good absorption effect on medium and high frequency noise, and has poor sound absorption performance for low-frequency noise below 400 Hz; the use of a complex square enclosure structure greatly increases the manufacturing cost of the soundproof enclosure.

[0004] A Chinese patent with publication number CN 220185339 U discloses a noise reduction device for a water pump, which uses a spring structure to reduce the vibration inside the water pump, uses a composite structure for noise reduction, and covers the outer layer of the water pump shell with foam EVA sound insulation cotton. Due to material limitations, the following problems exist: when the vibration frequency is close to or equal to the natural frequency of the spring, the effect of the spring vibration reduction system will be significantly reduced; the EVA sound insulation cotton has a large deadweight and poor sound absorption performance for absorbing low-frequency noise, which is not conducive to the heat dissipation of the water pump.

[0005] The low-frequency noise technology of heat exchange station water pump has the following problems:

[0006] 1 The existing soundproof enclosure design is mainly used to reduce the wide-band noise of the water pump in the heat exchange station. The noise reduction effect on the low-frequency noise that most significantly affects the health of residents is not ideal. It is necessary to develop soundproof enclosure technology for the low-frequency noise of the water pump in the heat exchange station.

[0007] 2 The existing sound insulation cover design does not take into account the different frequency bands of noise generated by the heat exchange station water pump motor and bearings, and adopts a unified sound absorption and noise reduction technology for all parts of the water pump.

[0008] 3 It is difficult to effectively reduce the low-frequency noise of the heat exchange station by using a soundproof cover alone. It needs to be coupled with vibration reduction and noise reduction technology. According to the frequency band characteristics of the noise generated by various parts of the water pump of the heat exchange station, different noise reduction technologies should be adopted to reasonably reduce the noise. Summary of the invention

[0009] The purpose of the present invention is to provide a device for reducing the low-frequency noise of a water pump in a heat exchange station and a working method thereof. The device is provided with a sound insulation cover and a magnetic device. The water pump sound insulation cover is provided with noise reduction microholes and noise reduction cavities to reduce low-frequency noise. The device is detachably installed on the outside of the water pump, which is convenient for the maintenance and overhaul of the water pump and is suitable for the noise reduction treatment of the low-frequency noise of the water pump in the heat exchange station.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a device for reducing the low-frequency noise of a water pump in a heat exchange station, the structure of which includes a water pump, a coupling, a water pump sound insulation cover, a noise reduction chamber and a magnetic device, the noise reduction chamber is arranged in the inner cavity of the water pump sound insulation cover, the coupling is connected to the magnetic device, the water pump sound insulation cover includes an outer baffle plate of the sound insulation cover, an inner baffle plate of the sound insulation cover, a lower baffle plate of the sound insulation cover and an upper baffle plate of the sound insulation cover, the side wall of the inner baffle plate of the sound insulation cover is provided with a plurality of noise reduction micropores, and the outer baffle plate of the sound insulation cover and the inner baffle plate of the sound insulation cover are respectively coated with diatom mud coatings.

[0011] Furthermore, the noise reduction chamber is arranged between the outer baffle plate of the soundproof enclosure and the inner baffle plate of the soundproof enclosure, and a plurality of isolation baffle plates are arranged in the noise reduction chamber. The isolation baffle plates are rectangular, and the noise reduction chamber is divided into a plurality of sub-chambers with different thicknesses by the plurality of isolation baffle plates.

[0012] Furthermore, six isolation baffles are provided in the noise reduction chamber, and the noise reduction chamber is divided into six sub-chambers with different thicknesses by the six isolation baffles, so that low-frequency noise is fully absorbed in frequency bands in the sub-chambers with different thicknesses.

[0013] Furthermore, the diameter of the noise reduction microholes is 0.8-1.2 mm, and the spacing between adjacent noise reduction microholes is 7-9 mm.

[0014] Furthermore, the magnetic device includes a motor, a bar magnet, an annular magnet, a shaft housing, a front shaft of a coupling and a rear shaft of a coupling, the motor is connected to the front shaft of the coupling and the rear shaft of the coupling, the front shaft of the coupling and the rear shaft of the coupling are integrated, the front shaft of the coupling is connected to the water inlet of the water pump, and the rear shaft of the coupling is connected to the water outlet of the water pump, the bar magnet is arranged on the inner side of the shaft housing, and the circumferential position of the motor shaft is adjusted by the magnetic force of the bar magnet, and the annular magnet is arranged at the front of the shaft housing, and the axial position of the motor shaft is adjusted by the magnetic force of the annular magnet.

[0015] Furthermore, the bar magnets are provided with four strips, and the four strip magnets are evenly arranged on the inner side of the shaft housing, and the ring magnets are provided with two strips.

[0016] Furthermore, the water pump sound insulation cover is in an irregular cylindrical shape.

[0017] Furthermore, the thickness of the diatom mud coating is 1.5-2.5 mm.

[0018] A method for reducing the noise of a low-frequency noise device of a water pump in a heat exchange station,

[0019] The water pump emits 20-400Hz noise when working, and the noise-reducing micropores evenly spaced on the surface of the diatom mud coating absorb the low-frequency noise of 100-200Hz;

[0020] The thin diatom mud coating on the surface of the inner baffle of the soundproof enclosure absorbs the high-frequency noise of 150 to 400 Hz;

[0021] 20-120Hz low-frequency noise enters the noise reduction chamber through the isolation inner baffle. The noise reduction cavity is divided into six sub-chambers with different thicknesses. Low-frequency noise is efficiently absorbed in the thicker sub-chamber, and high-frequency noise is efficiently absorbed in the thinner sub-chamber, which broadens the frequency band of low-frequency noise and strengthens the absorption effect of low-frequency noise.

[0022] In response to the 160-400Hz noise generated by the water pump ball bearing, a magnetic device is used to reduce the circumferential and axial friction of the motor shaft, thereby reducing the generation of 200-400Hz high-frequency noise.

[0023] Beneficial effects of the present invention:

[0024] The present invention sprays a thin diatom mud coating on the surface of the inner baffle of the sound insulation cover, utilizes the porous structure characteristics of the small pores in the diatom mud coating to absorb low-frequency noise, expands the effective sound absorption area, and the diatom mud coating on the surface of the inner baffle of the sound insulation cover can further absorb low-frequency noise.

[0025] By using a thin diatom mud coating on the surface of the noise reduction chamber and the inner baffle of the soundproof enclosure in combination with the noise reduction micropores, the porous structure of the diatom mud coating absorbs low-frequency noise with higher frequency bands, and the aperture and hole spacing of the noise reduction micropores are designed for the low-frequency noise with lower frequency bands in other frequency bands. This can broaden the frequency band of low-frequency noise absorbed and enhance the absorption effect of low-frequency noise.

[0026] According to the frequency band of low-frequency noise, the noise reduction chamber of the soundproof enclosure is divided into six chambers with different thicknesses. The absorption efficiency of low-frequency noise with low frequency is high in the chamber with large thickness, and the absorption efficiency of high-frequency noise with low frequency is high in the chamber with small thickness. The efficient absorption of low-frequency noise in a wide frequency band is achieved through precise design and calculation of the chamber thickness.

[0027] In view of the noise characteristics of high-frequency noise generated by water pump ball bearings and low-frequency noise generated by motors, magnetic devices are used to replace traditional bearings. By reducing circumferential and axial friction, the generation of high-frequency noise is reduced, and the sound insulation cover is focused on absorbing low-frequency noise. By coupling the vibration reduction and noise reduction technology of the magnetic device with the sound absorption technology of the sound insulation cover, the low-frequency noise and high-frequency noise of the heat exchange station are controlled in sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the water pump sound insulation cover of the present invention;

[0030] Figure 3 It is a schematic diagram of the noise reduction chamber structure of the present invention;

[0031] Figure 4 is a cross-sectional view of the internal structure of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the magnetic device of the present invention;

[0033] Figure 6 It is a schematic diagram of the installation structure of the magnetic device;

[0034] Figure 7 This is the schematic diagram of the magnetic device.

[0035] In the figure:

[0036] 1. Diatom mud coating, 2. Noise reduction micropores, 3. Noise reduction chamber, 4. Coupling, 5. Outer baffle of sound insulation cover, 6. Inner baffle of sound insulation cover, 7. Lower baffle of sound insulation cover, 8. Upper baffle of sound insulation cover, 9. Water pump, 10. Isolation baffle, 11. Motor, 12. Bar magnet, 13. Ring magnet, 14. Shaft housing, 15. Front shaft of coupling, 16. Rear shaft of coupling. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figures 1 to 7As shown: a device for reducing low-frequency noise of a water pump in a heat exchange station, the structure of which includes a water pump 9, a coupling 4, a water pump soundproof cover, a noise reduction chamber 3 and a magnetic device, the noise reduction chamber 3 is arranged in the inner cavity of the water pump soundproof cover, the coupling 4 is connected to the magnetic device, the water pump soundproof cover is an irregular cylindrical shape, because the frequency bands of noise generated by the water pump motor 11, the coupling 10 and the pump body of the heat exchange station are different, different noise reduction technologies are used for each part of the water pump 9. The water pump soundproof cover includes an outer baffle 5 of the soundproof cover, an inner baffle 6 of the soundproof cover, a lower baffle 7 of the soundproof cover and an upper baffle 8 of the soundproof cover, and the side wall of the inner baffle 6 of the soundproof cover is provided with a plurality of noise reduction micropores 2, the diameter of the noise reduction micropores 2 is 0.8-1.2mm, and the spacing between adjacent noise reduction micropores is 7-9mm. The outer baffle plate 5 and the inner baffle plate 6 of the soundproof enclosure are respectively coated with a diatom mud coating 1, and the thickness of the diatom mud coating 1 is 1.5-2.5 mm. The material of the soundproof enclosure is plastic; the noise reduction chamber 3 is arranged between the outer baffle plate 5 and the inner baffle plate 6 of the soundproof enclosure, and a plurality of isolation baffles 10 are arranged in the noise reduction chamber 3, and the isolation baffles are rectangular, and the noise reduction chamber 3 is divided into a plurality of sub-chambers of different thicknesses by the plurality of isolation baffles 10.

[0039] like Figure 5 , Figure 6 and Figure 7 As shown, the magnetic device includes a motor 11, a bar magnet 12, an annular magnet 13, a shaft housing 14, a coupling front shaft 15 and a coupling rear shaft 16. The motor 11 is connected to the coupling front shaft 15 and the coupling rear shaft 16. The coupling front shaft and the coupling rear shaft are integrated. The coupling front shaft is connected to the water inlet of the water pump, and the coupling rear shaft is connected to the water outlet of the water pump. The bar magnet 12 is provided with four strips, and the four strip magnets are evenly arranged on the inner side of the shaft housing. The position of the motor shaft along the circumferential direction is adjusted by the magnetic force of the bar magnet. The annular magnet 13 is provided with two strips, and the annular magnet 13 is arranged at the front of the shaft housing. The position of the motor shaft along the axial direction is adjusted by the magnetic force of the annular magnet. The magnetic device replaces the traditional bearing, avoids the noise generated by the friction of the balls in the bearing, and reduces the high-frequency noise of the water pump operation from the noise source.

[0040] The inner baffle of the soundproof enclosure is a hollow cylinder, with a plurality of noise reduction micropores on the surface. The diameter of the noise reduction micropores is 1 mm. In order to achieve the maximum absorption of low-frequency noise, the spacing between adjacent noise reduction micropores is 8 mm, which absorbs low-frequency noise in the frequency band of 100-200 Hz and reduces the working noise of the water pump 9. The outer baffle of the soundproof enclosure and the inner baffle of the soundproof enclosure are respectively coated with diatom mud coatings, and the thickness of the diatom mud coating is 2 mm. The porous molecular structure on the surface of the diatom mud coating 1 has a significant absorption effect on low-frequency noise in the frequency band of 150-400 Hz.

[0041] The space between the outer baffle plate 5 of the soundproof enclosure surrounding the water pump 9 housing and the inner baffle plate 6 of the soundproof enclosure is the noise reduction chamber 3; six isolation baffles are arranged in the noise reduction chamber, and the noise reduction chamber is divided into six sub-chambers of different thicknesses by the six isolation baffles, so that the low-frequency noise in the range of 20 to 120 Hz can be fully absorbed in the sub-chambers of different thicknesses in the frequency bands.

[0042] The isolation baffle 10 is rectangular and is connected to the outer baffle 5 and the inner baffle 6 of the soundproof enclosure by welding; the lower baffle 7 of the soundproof enclosure is consistent with the upper baffle 8 of the soundproof enclosure in shape and is connected to the outer baffle 5 and the inner baffle 6 of the soundproof enclosure by welding.

[0043] There are four bar magnets, which are evenly arranged on the inner side of the shaft housing, and there are two ring magnets.

[0044] A device for reducing low-frequency noise of a water pump in a heat exchange station emits 20-400Hz noise when the water pump is working. The noise reduction micropores evenly arranged on the surface of the diatom mud coating absorb the low-frequency noise of 100-200Hz; the thin diatom mud coating on the surface of the inner baffle of the sound insulation cover absorbs the high-frequency noise of 150-400Hz; the low-frequency noise of 20-120Hz enters the noise reduction chamber through the isolation inner baffle, and the noise reduction cavity is divided into six sub-chambers with different thicknesses. The low-frequency noise with low frequency is efficiently absorbed in the sub-chamber with large thickness, and the low-frequency noise with high frequency is efficiently absorbed in the sub-chamber with small thickness, which broadens the frequency band of the absorbed low-frequency noise and strengthens the absorption effect of the low-frequency noise; for the noise of 160-400Hz generated by the water pump ball bearing, a magnetic device is used to replace the traditional water pump ball bearing, and the generation of 200-400Hz high-frequency noise is reduced by reducing the circumferential and axial friction. The vibration and noise reduction technology of the magnetic device and the sound absorption technology of the soundproof cover are coupled with each other to achieve segmented control of the low-frequency noise and high-frequency noise of the heat exchange station.

[0045] The above description is only used to illustrate some principles of the present invention. This specification is not intended to limit the present invention to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for by the present invention.

[0046] Except for the technical features described in the specification, the other technical features are known to those skilled in the art.

Claims

1. A device for reducing low-frequency noise of a water pump in a heat exchange station, comprising a water pump and a coupling, characterized in that: It also includes a water pump soundproof cover, a noise reduction chamber and a magnetic device. The noise reduction chamber is arranged in the inner cavity of the water pump soundproof cover. The coupling is connected to the magnetic device. The water pump soundproof cover includes an outer baffle plate of the soundproof cover, an inner baffle plate of the soundproof cover, a lower baffle plate of the soundproof cover and an upper baffle plate of the soundproof cover. The side wall of the inner baffle plate of the soundproof cover is provided with a plurality of noise reduction micropores. The outer baffle plate of the soundproof cover and the inner baffle plate of the soundproof cover are respectively coated with diatom mud coatings.

2. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 1 is characterized in that: The noise reduction chamber is arranged between the outer baffle plate of the soundproof enclosure and the inner baffle plate of the soundproof enclosure. A plurality of isolation baffle plates are arranged in the noise reduction chamber. The isolation baffle plates are rectangular and the noise reduction chamber is divided into a plurality of sub-chambers with different thicknesses by the plurality of isolation baffle plates.

3. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 2 is characterized in that: Six isolation baffles are arranged in the noise reduction chamber, and the noise reduction chamber is divided into six sub-chambers with different thicknesses by the six isolation baffles, so that low-frequency noise is fully absorbed in frequency bands in the sub-chambers with different thicknesses.

4. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 1 is characterized in that: The diameter of the noise reduction micropores is 0.8-1.2 mm, and the spacing between adjacent noise reduction micropores is 7-9 mm.

5. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 1 is characterized in that: The magnetic device includes a motor, a bar magnet, an annular magnet, a shaft housing, a front shaft of a coupling and a rear shaft of a coupling. The motor is connected to the front shaft of the coupling and the rear shaft of the coupling. The front shaft of the coupling and the rear shaft of the coupling are integrated. The front shaft of the coupling is connected to the water inlet of the water pump, and the rear shaft of the coupling is connected to the water outlet of the water pump. The bar magnet is arranged on the inner side of the shaft housing, and the position of the motor shaft along the circumferential direction is adjusted by the magnetic force of the bar magnet. The annular magnet is arranged at the front of the shaft housing, and the position of the motor shaft along the axial direction is adjusted by the magnetic force of the annular magnet.

6. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 1 is characterized in that: There are four bar magnets, which are evenly arranged on the inner side of the shaft housing, and there are two ring magnets.

7. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 1 is characterized in that: The water pump sound insulation cover is in an irregular cylindrical shape.

8. The device for reducing low-frequency noise of a water pump in a heat exchange station according to claim 1 is characterized in that: The thickness of the diatom mud coating is 1.5-2.5 mm.

9. A method for reducing low-frequency noise of a heat exchange station water pump according to any one of claims 1 to 8, characterized in that: The water pump emits 20-400Hz noise when working, and the noise-reducing micropores evenly spaced on the surface of the diatom mud coating absorb the low-frequency noise of 100-200Hz; The thin diatom mud coating on the surface of the inner baffle of the soundproof enclosure absorbs the high-frequency noise of 150 to 400 Hz; 20-120Hz low-frequency noise enters the noise reduction chamber through the isolation inner baffle. The noise reduction cavity is divided into six sub-chambers with different thicknesses. Low-frequency noise is efficiently absorbed in the thicker sub-chamber, and high-frequency noise is efficiently absorbed in the thinner sub-chamber, which broadens the frequency band of low-frequency noise and strengthens the absorption effect of low-frequency noise. In response to the 160-400Hz noise generated by the water pump ball bearing, a magnetic device is used to reduce the circumferential and axial friction of the motor shaft, thereby reducing the generation of 200-400Hz high-frequency noise.

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