Noise reduction device of air source heat pump

Abstract

The invention relates to the technical field of noise reduction devices of air source heat pumps, in particular to a noise reduction device of an air source heat pump, which comprises an air source heat pump box body, anti-noise covers are buckled on the sides of four corners of the top end of the air source heat pump box body, and noise reduction cover groups are movably mounted at the bottom ends of the four sides of the air source heat pump box body. The noise reduction cover set comprises a side connecting block fixed to the side of the air source heat pump box, an inner-layer steel plate is movably installed on the side of the side connecting block, a sound absorption layer set is connected to the outer side of the inner-layer steel plate, and an outer protection plate is connected to the outer side of the sound absorption layer set. The noise reduction cover set is rotationally and vertically placed and surrounds the periphery of the air source heat pump box body, when sound is transmitted in a cross-medium mode, the larger the density difference of two media is, the larger the loss of sound energy is, the transmission media of sound waves are changed through a sound shadow area formed by the noise reduction cover set, the loss of sound energy is increased, and therefore the noise reduction effect is achieved; and troubles on normal life and work of surrounding people are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pump noise reduction devices, and in particular to a noise reduction device for an air source heat pump. Background Art

[0002] An air source heat pump is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source, air, to a high-level heat source. It can convert low-level heat energy that cannot be directly used (such as the heat contained in air, soil, and water) into usable high-level heat energy, thereby achieving the purpose of saving some high-level energy. The air source heat pump system combines cold and hot sources in one, and does not require a special refrigeration room or boiler room. The unit can be placed on the roof or the ground at will, does not occupy the effective use area of ​​the building, and is very simple to construct and install. Since there is no need for a boiler, a corresponding boiler fuel supply system, a dust removal system, and a flue gas emission system, the system is safe, reliable, and does not pollute the environment.

[0003] Existing air-source heat pumps generate noise during operation due to the internal mechanical operation and fan rotation. However, the housing of the air-source heat pump can only partially block the spread of noise, but lacks the ability to effectively intercept the noise and reduce the noise. This has caused disturbances to the normal life and work of people around the equipment. In view of this, it is necessary to improve the traditional air-source heat pump unit. Therefore, a noise reduction device for air-source heat pumps is needed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A noise reduction device for an air source heat pump comprises an air source heat pump casing, wherein noise-proof covers are installed on the four corner side buckles of the top of the air source heat pump casing, and noise reduction cover groups are movably installed on the bottom ends of the four sides of the air source heat pump casing, and the noise reduction cover groups include side connecting blocks fixed to the sides of the air source heat pump casing, and inner steel plates are movably installed on the sides of the side connecting blocks, the outer side of the inner steel plate is connected to a sound-absorbing layer group, and the outer side of the sound-absorbing layer group is connected to an outer protective plate, and the inner side of the inner steel plate is fixed to the outer side of the air source heat pump casing by a fixing piece.

[0006] Preferably, the inner steel plate includes an inner side plate, the inner wall of the inner side plate is designed to be smooth, and the inner wall of the inner side plate is equidistantly provided with refraction guide grooves, which can extend the propagation path of the sound wave in the noise reduction cover group and increase the contact area between the sound wave and the sound-absorbing material, thereby more effectively absorbing and reducing the noise. In addition, the refraction guide groove can also change the propagation direction of the sound wave, causing it to be reflected and refracted multiple times in the sound insulation cover, further reducing the propagation of noise.

[0007] Preferably, sound-absorbing holes are opened on the corner groove edges of the inner wall of the refraction guide groove. The sound-absorbing holes in the corner groove of the inner wall of the refraction guide groove are designed to absorb the energy of sound waves and convert them into heat energy, thereby reducing the intensity of the sound waves. The height and position of the noise reduction cover group can form a sound shadow area, which facilitates the achievement of noise reduction effects.

[0008] Preferably, the sound-absorbing layer group includes an outer frame fixed to the side of the inner panel, and a plurality of inner partitions are connected to the inner wall of the outer frame. A high-density rock wool board is provided on the surface of the outer frame. The high-density rock wool board design not only has good sound insulation effect and can effectively block the propagation of sound waves, but also has waterproof, heat-resistant, UV-resistant and other properties, and can maintain stable performance in a variety of environments.

[0009] Preferably, the fixing part includes two support plates at the bottom end of the inner wall of the inner plate, and the support plates are buckled on the surface of the threaded shaft. The end of the threaded shaft is connected and fixed to the outside of the air source heat pump box. The threaded sleeve on the outer side of the threaded shaft is provided with a hexagonal nut. By loosening the hexagonal nut, the support plate can be separated from the surface of the threaded shaft, which is convenient for flipping and adjusting the noise reduction cover group, and then the noise reduction cover group can be controlled to be flat on the ground surface. The noise reduction cover group can be flipped and adjusted independently, which is convenient for maintenance of mechanical equipment under the air source heat pump box.

[0010] Preferably, a rubber pad is sleeved on the outside of the threaded shaft, and the rubber pad consists of a rubber ring end and a pad end. The pad end of the rubber pad is attached to the left side of the support plate vertical plate end, and the rubber ring end of the rubber pad is attached to the right side of the support plate vertical plate end. The pad end of the rubber pad is built into the support plate and the air source heat pump box, thereby performing a vibration reduction operation on the noise reduction cover group to prevent the mechanical operation in the air source heat pump box from causing the noise reduction cover group to collide and vibrate to produce abnormal noise.

[0011] Preferably, the noise-proof cover includes a lower expansion cover, and pads are connected to the four corners of the inner wall of the lower expansion cover, and the pads are fixed to the corners of the air source heat pump box by screws. The pads are fixed to the corners of the air source heat pump box by the combination of the pads and the screws, which makes it convenient to reasonably adjust and install the lower expansion cover according to actual usage requirements.

[0012] Preferably, a rubber ring is provided on the inner wall of the square groove opening at the top of the lower expansion cover, and the rubber ring is fitted on the peripheral side of the top of the air source heat pump box. When the lower expansion cover is installed, the rubber ring on the inner wall of the square groove of the lower expansion cover can fit on the top surface of the air source heat pump box, thereby reducing the vibration force generated by resonance during mechanical operation inside the air source heat pump box and preventing the lower expansion cover from bumping and generating noise.

[0013] Preferably, the left and right ends of the lower expansion cover are connected with corner plates, and the inner walls of the vertical plate ends of the lower expansion cover are connected with sound-absorbing cotton boards. The passing wind flow can be guided by the inclined corner plates, and the wind outlet can be reduced, thereby increasing the wind flow rate and ensuring the heat dissipation effect of the air source heat pump box.

[0014] The present invention has at least the following beneficial effects: 1. By setting up a noise reduction cover group, a noise reduction shadow zone is formed on the surrounding side. Compared with the traditional structure, this device rotates and stands the noise reduction cover group so that the noise reduction cover group surrounds the air source heat pump box. When sound propagates across the medium, the greater the density difference between the two media, the greater the loss of sound energy. The sound shadow zone formed by the noise reduction cover group changes the propagation medium of the sound wave and increases the loss of sound energy, thereby achieving a noise reduction effect and reducing the disturbance to the normal life and work of people around.

[0015] 2. By setting up an inner steel plate and a sound-absorbing layer group, the noise generated by the mechanical operation of the air source heat pump box can be effectively reduced. The sound waves can be reflected and guided by the refraction guide groove to improve the sound wave attenuation effect. At the same time, multiple sound-absorbing holes can absorb the energy of the sound waves and convert it into heat energy, thereby reducing the intensity of the sound waves. The rock wool board is composed of slender fibers made by centrifugal method. These fibers are interwoven to form a large number of tiny pores. When the sound waves enter these pores, the energy of the sound waves will be consumed by the air friction and viscosity between the fibers, thereby achieving the sound absorption effect.

[0016] 3. The movable setting of the noise reduction cover group can facilitate the staff to flip the noise reduction cover group down so that the noise reduction cover group can be placed flat on the ground. Compared with the traditional overall cover design, the movable structure design can facilitate the disassembly and assembly of the mechanical equipment cover on the outside under the air source heat pump box. When repairing the equipment, there is no need to disassemble and assemble the entire covering noise reduction plate. The single-sided noise reduction cover group can be adjusted to ensure convenience during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the external structure of a noise reduction device for an air source heat pump proposed by the present invention; Figure 2 This is a schematic diagram of the external unfolded structure of a noise reduction device for an air source heat pump proposed by the present invention; Figure 3 This is a schematic diagram of the three-dimensional disassembled structure of a fixing part in a noise reduction device for an air source heat pump proposed in the present invention; Figure 4 This is a schematic diagram of the three-dimensional disassembled structure of a noise reduction cover group in a noise reduction device for an air source heat pump proposed in the present invention; Figure 5 This is a schematic side planar structural diagram of an inner steel plate in a noise reduction device for an air source heat pump proposed in the present invention; Figure 6 This is a schematic diagram of the partial three-dimensional structure of a sound-absorbing layer group in a noise reduction device for an air source heat pump proposed by the present invention; Figure 7 This is a schematic diagram of the three-dimensional bottom-up structure of a noise-proof cover in a noise reduction device for an air source heat pump proposed in the present invention.

[0019] In the figure: 1. Air source heat pump box; 2. Noise reduction cover group; 21. Side connection block; 22. Inner steel plate; 221. Inner side plate; 222. Refraction guide groove; 223. Sound-absorbing hole; 23. Sound-absorbing layer group; 231. Outer frame; 232. Inner partition; 233. Rock wool board; 24. Outer guard plate; 3. Noise-proof cover; 31. Pad frame; 32. Lower expansion cover; 33. Angle plate; 34. Sound-absorbing cotton board; 4. Fixing parts; 41. Support plate; 42. Threaded shaft; 43. Hexagonal nut; 44. Rubber pad. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Reference Figure 1-7 A noise reduction device for an air source heat pump comprises an air source heat pump casing 1, a noise-proof cover 3 is installed on the four corner side buckles of the top of the air source heat pump casing 1, and a noise reduction cover group 2 is movably installed on the bottom of the four sides of the air source heat pump casing 1. The noise reduction cover group 2 comprises a side connecting block 21 fixed to the side of the air source heat pump casing 1, and an inner steel plate 22 is movably installed on the side of the side connecting block 21, a sound-absorbing layer group 23 is connected to the outside of the inner steel plate 22, and an outer protective plate 24 is connected to the outside of the sound-absorbing layer group 23, and the inner side of the inner steel plate 22 is fixed to the outside of the air source heat pump casing 1 by a fixing member 4.

[0022] The inner steel plate 22 includes an inner plate 221 . The inner wall of the inner plate 221 is smooth and has refraction guide grooves 222 equidistantly formed on the inner wall.

[0023] A sound absorbing hole 223 is formed at the corner edge of the inner wall of the refraction guide groove 222 .

[0024] The sound absorbing layer group 23 includes an outer frame 231 fixed to the side of the inner plate 221 , and a plurality of inner partitions 232 are connected to the inner wall of the outer frame 231 . A high-density rock wool board 233 is provided on the surface of the outer frame 231 .

[0025] The fixing part 4 includes two support plates 41 at the bottom end of the inner wall of the inner plate 221, and the support plates 41 are buckled on the surface of the threaded shaft 42. The end of the threaded shaft 42 is connected and fixed to the outside of the air source heat pump box 1. The outer threaded sleeve of the threaded shaft 42 is provided with a hexagonal nut 43.

[0026] A rubber pad 44 is sleeved on the outside of the threaded shaft 42. The rubber pad 44 consists of a rubber ring end and a pad end. The pad end of the rubber pad 44 is attached to the left side of the vertical plate end of the support plate 41, and the rubber ring end of the rubber pad 44 is attached to the right side of the vertical plate end of the support plate 41.

[0027] The noise-proof cover 3 includes a lower expansion cover 32 , and pads 31 are connected to the four corners of the inner wall of the lower expansion cover 32 , and the pads 31 are fixed to the corners of the air source heat pump box 1 by screws.

[0028] A rubber ring is provided on the inner wall of the square groove opening at the top end of the lower expansion cover 32 , and the rubber ring is attached to the circumference of the top end of the air source heat pump box 1 .

[0029] The left and right ends of the lower expansion cover 32 are connected with corner plates 33 , and the inner walls of the vertical plate ends of the lower expansion cover 32 are connected with sound-absorbing cotton plates 34 .

[0030] The working principle of the air source heat pump box 1 can be divided into four main steps: compression, condensation, expansion and evaporation. The specific process is as follows: Compression: The compressor in the air source heat pump box 1 compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas. In this process, the temperature and pressure of the refrigerant are significantly increased.

[0031] Condensation: High-temperature and high-pressure refrigerant gas enters the condenser, exchanges heat with cold water or air, releases heat, cools and liquefies the refrigerant, and the released heat is transferred to the indoor air or water that needs to be heated.

[0032] Expansion: The liquefied refrigerant passes through the expansion valve throttle valve, and the pressure and temperature drop rapidly, turning into a low-temperature and low-pressure liquid.

[0033] Evaporation: Low-temperature, low-pressure liquid enters the evaporator, absorbs heat from the outside air, and evaporates into gas. This process transfers heat from the outside air to the refrigerant. Through the continuous cycle of this process, the air source heat pump box 1 can convert the low-temperature heat in the air into high-temperature heat, thereby meeting the heating, cooling, and hot water needs of the home or building.

[0034] The main advantages of the air source heat pump box 1 include high efficiency, environmental protection and energy saving. It uses free renewable resources in the air as a heat source, reduces the demand for limited fossil fuels, reduces carbon dioxide emissions, and plays a positive role in improving air quality and protecting the environment. However, the performance of the air source heat pump box 1 will also be affected by the outdoor temperature. Under extremely low temperature climate conditions, its heating effect may be reduced.

[0035] The inner side surface of the inner steel plate 22 is a smooth surface, which can easily reflect part of the sound waves and reduce the direct propagation of the sound waves. At the same time, the inner steel plate 22, the sound-absorbing layer group 23 and the outer protective plate 24 cooperate to form a laminated layer to ensure the tightness and thickness of the noise reduction cover group 2, thereby improving the noise reduction effect to a certain extent.

[0036] The noise sound waves generated by the mechanical operation inside the air source heat pump box 1 can be transmitted to the inside of the inner panel 221. The inner wall of the refraction guide groove 222 of the inner panel 221 is designed to be bent, which can facilitate some sound waves to be repeatedly ejected in the refraction guide groove 222, reducing the direct propagation of the sound waves. The other part of the sound waves are absorbed after passing through the sound-absorbing holes 223 and converted into heat energy to achieve the effect of noise reduction. The refraction guide groove 222 can extend the propagation path of the sound wave in the noise reduction cover group 2, increase the contact area between the sound wave and the sound-absorbing material, thereby more effectively absorbing and reducing the noise. In addition, the refraction guide groove 222 can also change the propagation direction of the sound wave, causing it to be reflected and refracted multiple times in the sound insulation cover, further reducing the propagation of noise.

[0037] The design of the sound-absorbing holes 223 in the corner grooves on the inner wall of the refractive guide groove 222 can absorb the energy of the sound waves and convert it into heat energy, thereby reducing the intensity of the sound waves. The height and position of the noise reduction cover group 2 can form a sound shadow area. The noise reduction shadow area refers to the area formed behind the sound barrier where the sound waves cannot directly reach. In this area, due to the obstruction of the sound barrier, the propagation of the sound waves is significantly attenuated, so the noise level is significantly reduced. The formation of the sound shadow area is due to the reflection, transmission and diffraction of the sound waves when they encounter the sound barrier, but it mainly relies on the sound barrier to block the direct sound and The ability to isolate transmitted sound, the size and shape of the sound shadow area depend on many factors, including the frequency of the sound wave, the height and length of the sound barrier, the distance between the sound source and the receiving point, etc. Generally speaking, high-frequency sound waves have a shorter wavelength and are more easily blocked, so the sound shadow area is relatively large, while low-frequency sound waves have a longer wavelength and are easy to bypass the sound barrier, so the sound shadow area is smaller and the noise reduction effect is poor. When sound propagates across media, the greater the difference in density between the two media, the greater the loss of sound energy. The noise reduction cover group 2 achieves the noise reduction effect by changing the propagation medium of the sound wave and increasing the loss of sound energy.

[0038] The porous or fibrous material inside the rock wool board 233 can absorb the energy of sound waves and convert it into heat energy, thereby reducing the intensity of the sound waves. The high-density rock wool board 233 design not only has good sound insulation effect and can effectively block the propagation of sound waves, but also has waterproof, heat-resistant, UV-resistant and other properties, and can maintain stable performance in a variety of environments. When the air source heat pump box 1 is inspected and repaired, the support plate 41 can be separated from the surface of the threaded shaft 42 by loosening the hexagonal nut 43, which is convenient for flipping and adjusting the noise reduction cover group 2, and then the noise reduction cover group 2 can be controlled to be flat on the ground surface. The noise reduction cover group 2 can be flipped and adjusted independently, which is convenient for the inspection and maintenance of mechanical equipment under the air source heat pump box 1.

[0039] When the hexagonal nut 43 is threadedly sleeved on the surface of the threaded shaft 42, the pad end of the rubber pad 44 is built in between the support plate 41 and the air source heat pump box body 1, thereby performing a vibration reduction operation on the noise reduction cover group 2 to prevent the mechanical operation in the air source heat pump box body 1 from causing the noise reduction cover group 2 to collide and vibrate to produce abnormal noise. When the hexagonal nut 43 is installed and tightened, the rubber ring end of the rubber pad 44 can be squeezed to effectively reduce the chance of the hexagonal nut 43 loosening during vibration. When the lower expansion cover 32 is installed, it is fixed to the corners of the air source heat pump box body 1 through the pad bracket 31 and the screws, which is convenient for reasonable adjustment and installation of the lower expansion cover 32 according to actual usage requirements.

[0040] When the lower expansion cover 32 is installed, the square groove at the top of the lower expansion cover 32 can be adapted to the top surface of the air source heat pump box 1. When the lower expansion cover 32 is installed, the rubber ring on the inner wall of the square groove of the lower expansion cover 32 can fit on the top surface of the air source heat pump box 1, reducing the vibration force generated by the resonance during the mechanical operation of the air source heat pump box 1, and avoiding the collision and noise of the lower expansion cover 32. The inclined corner plate 33 can guide the passing airflow, and by reducing the through-air vents, the airflow velocity is increased, thereby ensuring the heat dissipation effect of the air source heat pump box 1. At the same time, the fan noise at the top of the air source heat pump box 1 can be absorbed by the sound-absorbing cotton board 34, reducing the mechanical noise of the fan operation at the top pipe mouth to a certain extent.

[0041] Working principle: According to the attached Figure 1 With attached Figure 7 As shown, during use, the lower expansion cover 32 is used to cover the top of the air source heat pump housing 1 from top to bottom. A rubber strip is provided on the inner side of the lower expansion cover 32 so that the rubber strip is in contact with the side of the top of the air source heat pump housing 1, thereby reducing the resonance effect of the lower expansion cover 32 during use. When the lower expansion cover 32 is installed, the pad 31 can be placed against the edge of the air source heat pump housing 1 and fixed with screws. Secondly, according to the attached Figure 2 , Attachment Figure 3 With attached Figure 4As shown, the noise reduction cover group 2 is lifted upward, so that the noise reduction cover group 2 pushes the support plate 41 to move, so that the support plate 41 is buckled on the surface of the threaded shaft 42, and the rubber ring end of the rubber pad 44 is sleeved on the surface of the threaded shaft 42, so that the pad end of the rubber pad 44 is placed on the left side of the vertical plate end of the support plate 41, and finally fixed by the hexagonal nut 43 threaded on the surface of the threaded shaft 42. Under the rotation and extrusion of the hexagonal nut 43, the pad end of the rubber pad 44 can be fitted on the surface of the air source heat pump box 1.

[0042] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A noise reduction device for an air source heat pump, comprising an air source heat pump housing (1), characterized in that: The four corner side buckles of the top of the air source heat pump housing (1) are equipped with noise-proof covers (3), and the bottom ends of the four sides of the air source heat pump housing (1) are all movably equipped with noise reduction cover groups (2), and the noise reduction cover groups (2) include side connecting blocks (21) fixed to the sides of the air source heat pump housing (1), and the sides of the side connecting blocks (21) are movably equipped with inner steel plates (22), the outer sides of the inner steel plates (22) are connected to sound absorbing layer groups (23), and the outer sides of the sound absorbing layer groups (23) are connected to outer protective plates (24), and the inner sides of the inner steel plates (22) are fixed to the outer sides of the air source heat pump housing (1) through fixing members (4).

2. The noise reduction device for an air source heat pump according to claim 1, characterized in that: The inner steel plate (22) comprises an inner plate (221), the inner wall of the inner plate (221) being designed to be smooth, and the inner wall of the inner plate (221) being provided with refraction guide grooves (222) at equal intervals.

3. The noise reduction device for an air source heat pump according to claim 2, characterized in that: A sound-absorbing hole (223) is provided at the corner groove edge of the inner wall of the refraction guide groove (222).

4. The noise reduction device for an air source heat pump according to claim 1, characterized in that: The sound absorbing layer group (23) comprises an outer frame (231) fixed to the side of the inner plate (221), and the inner wall of the outer frame (231) is connected to a plurality of inner partitions (232), and a high-density rock wool board (233) is provided on the surface of the outer frame (231).

5. The noise reduction device for an air source heat pump according to claim 1, characterized in that: The fixing member (4) comprises two supporting plates (41) connected to the bottom end of the inner wall of the inner plate (221), and the supporting plates (41) are buckled on the surface of the threaded shaft (42). The end of the threaded shaft (42) is connected and fixed to the outside of the air source heat pump box (1), and the outer thread of the threaded shaft (42) is provided with a hexagonal nut (43).

6. The noise reduction device for an air source heat pump according to claim 5, characterized in that: A rubber pad (44) is sleeved on the outside of the threaded shaft (42), and the rubber pad (44) consists of a rubber ring end and a pad end. The pad end of the rubber pad (44) is attached to the left side of the vertical plate end of the support plate (41), and the rubber ring end of the rubber pad (44) is attached to the right side of the vertical plate end of the support plate (41).

7. The noise reduction device for an air source heat pump according to claim 5, characterized in that: The noise-proof cover (3) comprises a lower expansion cover (32), and pads (31) are connected to the four corners of the inner wall of the lower expansion cover (32), and the pads (31) are fixed to the corners of the air source heat pump box (1) by screws.

8. The noise reduction device for an air source heat pump according to claim 7, characterized in that: A rubber ring is provided on the inner wall of the square groove opening at the top end of the lower expansion cover (32), and the rubber ring is fitted on the circumference of the top end of the air source heat pump box (1).

9. The noise reduction device for an air source heat pump according to claim 8, characterized in that: The left and right ends of the lower expansion cover (32) are connected to corner plates (33), and the inner walls of the vertical plate ends of the lower expansion cover (32) are connected to sound-absorbing cotton boards (34).

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