Noise reduction device and detection method thereof

Abstract

The invention relates to the technical field of water heaters, in particular to a noise reduction device and a detection method thereof. According to the noise reduction device, after water in the water pump enters the noise reduction device, the water enters the buffering inner core through the water inlet of the shell, the water is subjected to first-time speed and pressure attenuation under blocking of the sealing end of the buffering inner core, and then the water is subjected to second-time speed and pressure attenuation when passing through the second water outlet hole; the second water outlet hole right faces the concave part, water acts on the concave part, resistance is provided under the action of stored water between the buffering inner core and the buffering outer core, then the water flows to the concave part from the second water outlet hole, then third-time speed and pressure attenuation can be achieved, after the water is attenuated for three times, the water flow tends to be gentle, and the water flow is smooth. The carried pressure pulsation energy of the water pump is not enough to cause resonance of the internal structure of the gas water heater behind the water pump, so that the peak value of preheating circulating noise is reduced, and the sound quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and particularly to a noise reduction device and a detection method thereof. Background Art

[0002] The zero-cold-water gas water heater is internally provided with a circulating water pump, which can draw back the stored water in the pipeline into the gas water heater in advance for heating, greatly improving the bathing comfort. The trend of compact kitchens promotes the miniaturization of the volume of gas water heaters. Restricted by the internal installation space of the gas water heater, the water pump develops towards miniaturization. In order to ensure the water pump head and circulating flow rate, the operating speed usually exceeds 5000 r / min.

[0003] The water pump of the zero-cold-water gas water heater is installed at the front end of the heat exchanger inlet. When the water pump operates, in addition to the disturbance of the pipe system caused by the vibration of the water pump body and the sound radiation to the air field, there should also be a periodic water flow pressure pulsation formed by the periodic drainage of the water pump acting on the heat exchanger and other structures to form a noise source. In the R & D test scenario, there are several prominent peaks in the spectral analysis diagram of the water pump circulating noise, and its frequency is basically the same as the fundamental frequency and N times frequency of the water pump pressure pulsation, and is close to a certain order of natural modal frequency of the internal structures of the gas water heater such as the heat exchanger. Moreover, the structures such as the heat exchanger are cavity structures. Experiments prove that the water pump pressure pulsation acts on the heat exchanger and other structures, and due to the proximity of the water pump pressure pulsation frequency to the natural modal frequency of the structure, it causes structural resonance to form vibration and noise, which is transmitted into the cavities such as the heat exchanger and undergoes multi-directional reflection to form randomly phased sound waves to superimpose and strengthen the noise. Summary of the Invention

[0004] One of the technical problems to be solved by the present invention is to provide a noise reduction device that can reduce the noise generated when the water pump works.

[0005] Another technical problem to be solved by the present invention is to provide a detection method for the noise reduction device, which can detect whether the noise reduction device works properly for maintenance.

[0006] The above first technical problem is solved by the following technical solutions:

[0007] A housing, forming a first accommodation chamber, the housing having a water outlet and a water inlet;

[0008] A buffer inner core and a buffer outer core, the buffer outer core being limited within the first accommodation chamber. The buffer outer core has a first water outlet hole and a second accommodation chamber for accommodating the buffer inner core. The buffer outer core is recessed with a plurality of recessed parts in the circumferential direction towards the buffer inner core. The buffer inner core is a cylindrical structure with one end open. The sealed end of the buffer inner core extends into the second accommodation chamber. The opening of the buffer inner core is communicated with the water inlet of the outer shell. A plurality of columns of second water outlet holes are circumferentially arranged on the buffer inner core, and each column of the second water outlet holes faces the same recessed part.

[0009] Compared with the background art, the noise reduction device of the present invention has the following beneficial effects:

[0010] In the present invention, the purpose of speed and pressure attenuation is achieved through the barrel-shaped buffer inner core, the second water outlet holes provided on the buffer inner core, and the recessed parts on the circumference of the buffer outer core. After the water in the water pump enters the noise reduction device, it first enters the buffer inner core through the water inlet of the outer shell. Since the buffer inner core is a cylindrical structure with one end open, the water undergoes the first attenuation of speed and pressure under the obstruction of the sealed end of the buffer inner core. Then, when the water passes through the second water outlet holes, due to the reduction of the aperture of the second water outlet holes, the water undergoes the second attenuation of speed and pressure during the process of flowing out of the buffer inner core. Since the second water outlet holes face the recessed parts, the water acts on the recessed parts, and under the action of the water stored between the buffer inner core and the buffer outer core, resistance is provided, so that the water can achieve the third attenuation of speed and pressure after flowing from the second water outlet holes to the recessed parts. After the water undergoes three attenuations, the water flow tends to be gentle, and the pressure pulsation energy carried by it is not sufficient to cause resonance of the internal structure of the gas water heater after the water pump, thereby reducing the peak value of the preheating cycle noise and improving the sound quality.

[0011] In one embodiment, the noise reduction device further includes a pressure sensor disposed at the water outlet of the outer shell, and the pressure sensor is configured to detect the pressure of the water flow at the water outlet.

[0012] In one embodiment, along the axial direction of the outer shell, any of the second water outlet holes of the buffer inner core facing the water outlet is higher than the water outlet.

[0013] In one embodiment, the buffer outer core is a rubber structural member or a silica gel structural member.

[0014] In one embodiment, the buffer inner core is a rubber structural member or a silica gel structural member.

[0015] In one embodiment, the thickness of the buffer outer core is less than the thickness of the buffer inner core.

[0016] In one embodiment, the outer shell includes a first shell and a second shell fixedly connected, the inner wall of the first shell is provided with a plurality of limiting protrusions, and the buffer outer core is provided with a plurality of limiting holes, the limiting protrusions are arranged in one-to-one correspondence with the limiting holes, and the limiting protrusions extend into the corresponding limiting holes to limit the rotation of the buffer outer core relative to the outer shell.

[0017] In one embodiment, the noise reduction device also includes a positioning ring for limiting the buffer inner core, a plurality of limiting ribs are arranged on the outer circumference of the buffer inner core, a plurality of limiting notches are arranged on the inner circumference of the positioning ring, the sealing end of the buffer inner core passes through the positioning ring so that the limiting ribs are located in the limiting notches, and the open end of the buffer inner core is provided with a limiting flange extending along the outer circumference of the buffer inner core, and the bottom surface of the limiting flange is in contact with the top surface of the positioning ring.

[0018] In one embodiment, a plurality of limiting bosses are provided on the outer periphery of the positioning ring, and the second shell has a plurality of limiting grooves, and the limiting grooves are provided in a one-to-one correspondence with the limiting bosses. The limiting bosses can extend into the limiting grooves and slide in the limiting grooves so that the limiting bosses can switch between a first position and a second position. When the limiting bosses are in the first position, the limiting bosses are located at the opening of the limiting grooves to enter or exit the limiting grooves. When the limiting bosses are in the second position, the buffer inner core is limited in rotation by the positioning ring and the second shell.

[0019] In one of the embodiments, the groove wall of the limiting groove is also provided with a locking protrusion, and the locking protrusion is arranged between the first position and the second position. The width of the position where the limiting groove is provided with the locking protrusion is reduced, and the second shell is rotated so that the limiting boss slides over the locking protrusion.

[0020] In one embodiment, a first installation transition surface is provided on the side of the limiting boss facing the second position, and a second installation transition surface is provided on the side of the locking protrusion facing the first position, and during the rotation of the second shell, the first installation transition surface and the second installation transition surface can fit together.

[0021] In one embodiment, the first water outlet hole is at least partially disposed on a side wall of the buffer outer core facing the water outlet.

[0022] The above second technical problem is solved by the following technical solution:

[0023] A noise reduction device detection method, applied to the noise reduction device described in any of the above solutions, comprises the following steps:

[0024] Obtain the difference in the outlet water pressure fluctuation ΔP of the noise reduction device in real time during the working process 实 , where the difference in the outlet water pressure fluctuation ΔP 实 is the difference in the pressure fluctuations of the front and rear outlet water pressures obtained at adjacent preset times;

[0025] Compare ΔP 实 with the preset range, and determine whether the noise reduction device is in normal operation, failure, or blockage according to the comparison result.

[0026] The control method of the noise reduction device described in the present invention has the following beneficial effects compared with the background technology:

[0027] By obtaining the difference in the outlet water pressure fluctuation of the noise reduction device in real time and comparing the difference in the outlet water pressure fluctuation of the noise reduction device obtained in real time with the preset range, it is possible to compare whether the pressure drop decreases after the water passes through the noise reduction device, and further detect whether the buffer inner core and the buffer outer core are working properly.

[0028] In one embodiment, comparing ΔP 实 with the preset range and determining whether the noise reduction device is in normal operation, failure, or blockage according to the comparison result includes:

[0029] If ΔP 实 is within the first preset range, the noise reduction device is in normal operation;

[0030] If ΔP 实 is within the second preset range, the noise reduction device fails;

[0031] If ΔP 实 is not within the first preset range and the second preset range, the noise reduction device is blocked;

[0032] The maximum value of the first preset range is less than the minimum value of the second preset range. Description of the Drawings

[0033] Figure 1 is an exploded view of the noise reduction device provided by the embodiment of the present invention;

[0034] Figure 2 is a cross-sectional view of the noise reduction device provided by the embodiment of the present invention Figure 1 ;

[0035] Figure 3 is a cross-sectional view of the noise reduction device provided by the embodiment of the present invention Figure 2 ;

[0036] Figure 4 is a structural diagram of the buffer inner core provided by the embodiment of the present invention;

[0037] Figure 5Cross-section of the buffer inner core provided by the embodiment of the present invention Figure 1 ;

[0038] Figure 6 Cross-section of the buffer inner core provided by the embodiment of the present invention Figure 2 ;

[0039] Figure 7 Schematic structural diagram of the buffer outer core provided by the embodiment of the present invention;

[0040] Figure 8 Top view of the buffer outer core provided by the embodiment of the present invention;

[0041] Figure 9 Installation schematic of the positioning ring and the second housing provided by the embodiment of the present invention Figure 1 ;

[0042] Figure 10 is Figure 9 Cross-sectional view of;

[0043] Figure 11 Installation schematic of the positioning ring and the second housing provided by the embodiment of the present invention Figure 2 ;

[0044] Figure 12 is Figure 11 Partial enlarged view at A of;

[0045] Figure 13 is Figure 11 Cross-sectional view of;

[0046] Figure 14 Flow chart of the noise reduction device detection method provided by the embodiment of the present invention Figure 1 ;

[0047] Figure 15 Flow chart of the noise reduction device detection method provided by the embodiment of the present invention Figure 2 .

[0048] Label description:

[0049] 1. Outer shell; 11. First housing; 111. Limit protrusion; 12. Second housing; 121. Limit groove; 122. Locking protrusion; 1221. Second installation transition surface; 101. Water outlet; 102. Water inlet; 2. Buffer inner core; 21. Second water outlet hole; 23. Limit rib; 24. Limit flange; 3. Buffer outer core; 31. First water outlet hole; 32. Limit hole; 33. Depressed part; 4. Pressure sensor; 5. Positioning ring; 51. Limit notch; 52. Limit boss; 521. First installation transition surface. Detailed implementation manners

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0051] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0052] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0053] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0054] In the prior art, the combustion noise of the gas water heater is low and not harsh. When the preheating circulation function is running, the water stored in the pipeline is pressurized and accelerated by the water pump, which disturbs the structure of the gas water heater. The copper pipe of the heat exchanger connected to the water pump outlet vibrates violently, forming a chaotic and harsh noise in the cavity structures such as the heat exchanger and the fan smoke hood, seriously affecting the user's bathing experience.

[0055] As Figures 1 to 13 shown, for this reason, an embodiment of the present application provides a noise reduction device, which can reduce the noise generated when the water pump works and improve the user's bathing experience.

[0056] As Figures 1 to 8As shown in the figure, the noise reduction device includes a housing 1, a pressure sensor 4, a buffer inner core 2, and a buffer outer core 3. The housing 1 forms a first accommodation chamber. The housing 1 has a water outlet 101 and a water inlet 102. The buffer outer core 3 is limited in the first accommodation chamber. The buffer outer core 3 has a first water outlet hole 31 and a second accommodation chamber for accommodating the buffer inner core 2. The buffer outer core 3 is recessed with a plurality of recessed portions 33 that can elastically deform and recover in the circumferential direction towards the buffer inner core 2. The first water outlet hole 31 is arranged opposite to the water outlet 101. The buffer inner core 2 is a barrel-shaped structure with one end open. The sealed end of the buffer inner core 2 extends into and is arranged in the second accommodation chamber. The opening of the buffer inner core 2 is communicated with the water inlet 102 of the housing 1. A plurality of rows of second water outlet holes 21 are arranged circumferentially on the buffer inner core 2. The buffer outer core 3 is recessed with a plurality of recessed portions 33 that can elastically deform and recover in the circumferential direction towards the buffer inner core 2. Each row of second water outlet holes 21 faces the same recessed portion 33.

[0057] After the water in the water pump enters the noise reduction device, it first enters the buffer inner core 2 through the water inlet 102 of the housing 1. Since the buffer inner core 2 is a barrel-shaped structure with one end open, the water undergoes the first attenuation of speed and pressure under the obstruction of the sealed end of the buffer inner core 2. Then, when the water passes through the second water outlet holes 21, due to the reduction of the aperture of the second water outlet holes 21, the water undergoes the second attenuation of speed and pressure during the process of flowing out of the buffer inner core 2. Since the second water outlet holes 21 face the recessed portions 33, the water acts on the recessed portions 33, and under the action of the water stored between the buffer inner core 2 and the buffer outer core 3, resistance is provided. Furthermore, when the water flows from the second water outlet holes 21 to the recessed portions 33, the third attenuation of speed and pressure can be achieved. After the water undergoes three attenuations, the water flow tends to be gentle, and the pressure pulsation energy carried by it is not sufficient to cause resonance of the internal structure of the gas water heater after the water pump, thereby reducing the peak value of the preheating cycle noise and improving the sound quality.

[0058] In order to enable more water to fall on the recessed portions 33 after flowing out from the second water outlet holes 21, the second water outlet holes 21 are arranged opposite to the recessed portions 33.

[0059] In some embodiments, the noise reduction device further includes a pressure sensor 4. The pressure sensor 4 is arranged at the water outlet 101 of the housing 1. The pressure sensor 4 is configured to detect the water flow pressure at the water outlet 101.

[0060] It should be noted that, in order to enable all the water passing through the buffer inner core 2 to pass through the recessed portions 33, in some embodiments, as Figure 2 shown, along the axial direction of the housing 1, any second water outlet hole 21 of the buffer inner core 2 facing the water outlet 101 is arranged higher than the water outlet 101. In this way, the water flowing out of the buffer inner core 2 will not directly flow out through the water outlet 101, but needs to first flow through the recessed portions 33 to reach the water outlet 101, further reducing the noise.

[0061] In some embodiments, the buffer outer core 3 is a rubber structural member or a silica gel structural member. For example, the rubber is nitrile rubber, and the deformation - recovery of the rubber or silica gel is used to absorb the pressure pulsation energy of the water pump. It can be understood that, in some other embodiments, the recessed portion 33 is a rubber structural member or a silica gel structural member, as long as the elastic deformation of the recessed portion 33 can be realized and the deformation can be restored. Since a plurality of recessed portions 33 that can elastically deform and recover are recessed along the circumferential direction of the buffer outer core 3 towards the buffer inner core 2, the recessed portions 33 recessed in this way can elastically deform within the housing 1 and recover under the action of their own restoring force.

[0062] In order to further reduce noise, in some embodiments, the buffer inner core 2 is a rubber structural member or a silica gel structural member. For example, the rubber is nitrile rubber, and the deformation - recovery of the rubber or silica gel is used to absorb the pressure pulsation energy of the water pump.

[0063] It should be noted that the thickness of the buffer outer core 3 is less than the thickness of the buffer inner core 2, so that the noise reduction effect is better. It should be noted that the material value range of the buffer inner core 2 and the buffer outer core 3 is 0.5mm ≤ t ≤ 2mm.

[0064] After the noise reduction device is assembled, the second water outlet hole 21 of the buffer inner core 2 is directly opposite to the recessed portion 33 of the buffer outer core 3, and it is necessary to ensure that there is a sufficient distance L3 between the second water outlet hole 21 and the recessed portion 33. If the distance is too small, the water flow will be reflected after hitting the recessed portion 33, causing the water flow to form turbulence and generate noise. If the distance is too large, it cannot ensure that the water flow coming out of the second water outlet hole 21 acts on the recessed portion 33 with a certain pressure to cause deformation and recovery to attenuate the pressure pulsation. The distance value range from the second water outlet hole 21 of the buffer inner core 2 to the recessed portion 33 of the buffer outer core 3 is 2mm ≤ L3 ≤ 6mm.

[0065] In some embodiments of the present application, the first water outlet hole 31 is at least partially disposed on the side wall of the buffer outer core 3 facing the water outlet 101. This can ensure that the water flow flows from the buffer outer core 3 to the water outlet 101, ensuring that the water can flow out of the noise reduction device normally.

[0066] Specifically, in this embodiment, the first water outlet hole 31 penetrates through the side wall and the bottom wall of the buffer outer core 3 to form an L - shaped notch. In this embodiment, the number of the recessed portions 33 is four, and the first water outlet hole 31 is disposed between two adjacent recessed portions 33, and the center line of the axis of the first water outlet hole 31 is equidistant from the center lines of the lengths of the two adjacent recessed portions 33. Of course, in other embodiments, the first water outlet hole 31 can also be disposed at the recessed portion 33, and the specific setting depends on the number of the recessed portions 33.

[0067] The inner diameter of the cross-section of the limiting buffer core 2 is defined as d1, and the inner diameter of the heat exchanger pipeline is d. Then d1 is greater than d. For example, if d is 12 mm, then d1 ≥ (d + 3) mm, that is, d1 ≥ 15 mm.

[0068] Due to the large fluctuations in the water flow pressure at the water pump outlet 101, if the inner diameter of the buffer cavity of the buffer core 2 is too small, the buffer core 2 will be in a state of being expanded and unable to recover. If the inner diameter is too large, the deformation effect of the buffer core 2 cannot be fully utilized to attenuate the water pump pressure pulsation. Therefore, the value range of the cross-sectional inner diameter of the buffer core 2 is 15 mm ≤ d1 ≤ 30 mm. The longer the length of the buffer core 2 made of nitrile rubber, the better its flexural performance and the better the effect of attenuating the water pump pressure pulsation energy. Tests have found that when the length L1 of the buffer core 2 < 35 mm, the effect of attenuating the water pump pressure pulsation energy drops sharply. Therefore, the value range of the length of the buffer core 2 in the embodiment of the present application is L1 ≥ 35 mm.

[0069] The aperture d2 and the spacing L2 of the second water outlet holes 21 have a great influence on the attenuation of the water flow pressure pulsation. If the aperture of the second water outlet holes 21 is too small, the stagnation resistance during water outlet is large, and the friction between the water flow and the hole wall of the second water outlet holes 21 of the buffer core 2 is intense, and even strong noise will be generated. If the aperture of the second water outlet holes 21 is too large, the water outlet is too smooth instantaneously, and the water flow with pressure pulsation cannot vibrate with the buffer core 2 through breathing, and the purpose of attenuating the water pump pressure pulsation cannot be achieved. In the embodiment of the present application, the value range of the diameter d2 of the second water outlet holes 21 is 2.5 mm ≤ d2 ≤ 5 mm. Four rows of holes are evenly distributed along the axis, and six second water outlet holes 21 are equally spaced in each row. The value range of the spacing L2 is 3 mm ≤ L2 ≤ 8 mm. The water passing area S1 of the second water outlet holes 21 ≥ the water passing area S of the heat exchanger pipeline, where S = 113 mm 2 。

[0070] Specifically, referring to Figure 1 as shown, the housing 1 includes a first housing 11 and a second housing 12, and the first housing 11 is fixedly connected to the second housing 12. For example, the first housing 11 and the second housing 12 are fixedly connected by screws and sealing rings, which can achieve the purpose of sealing the housing 1 while realizing the fixed connection. The first housing 11 is provided with a plurality of limiting protrusions 111, and the buffer outer core 3 is provided with a plurality of limiting holes 32. The limiting protrusions 111 and the limiting holes 32 are arranged in one-to-one correspondence, and the limiting protrusions 111 extend into the corresponding limiting holes 32 to limit the buffer outer core 3 from rotating relative to the housing 1. The limiting protrusions 111 and the limiting holes 32 cooperate with each other to prevent the buffer outer core 3 from rotating relative to the housing 1, and at the same time, the positioning of the buffer outer core 3 can be realized, avoiding the noise problem caused by the misalignment of the concave portion 33 and the second water outlet holes 21.

[0071] It should be noted that, as Figure 3 andFigure 5 As shown, a plurality of limiting protrusions 111 are arranged along the axial direction of the buffer outer core 3, and the limiting protrusions 111 are arranged in one-to-one correspondence with the limiting holes 32. In this way, the buffer outer core 3, which is a rubber structural member, can be prevented from deforming under the action of water and separating from the outer shell 1. At the same time, since the buffer outer core 3 is a rubber structural member or a silica gel structural member, it is convenient for the buffer outer core 3 to deform, which is beneficial to the installation of the limiting hole 32 and the limiting protrusion 111.

[0072] In order to be able to position the buffer inner core 2 in the first accommodation chamber formed by the outer shell 1, in some embodiments, continue to refer to Figure 1 , the noise reduction device further includes a positioning ring 5 for limiting the buffer inner core 2. A plurality of limiting ribs 23 are arranged on the outer periphery of the buffer inner core 2, and a plurality of limiting notches 51 are arranged on the inner periphery of the positioning ring 5. The sealed end of the buffer inner core 2 passes through the positioning ring 5 so that the limiting ribs 23 are located in the limiting notches 51, and the limiting notches 51 are arranged in one-to-one correspondence with the limiting ribs 23. In this way, the limiting ribs 23 and the limiting flange 24 cooperate with each other to prevent the buffer inner core 2 from rotating relative to the outer shell 1. The opening end of the buffer inner core 2 extends with a limiting flange 24 along the outer periphery of the buffer inner core 2, and the bottom surface of the limiting flange 24 contacts the top surface of the positioning ring 5. In this way, the buffer inner core 2 can be limited in the positioning ring 5, and the positioning ring 5 is limited by the outer shell 1, and thus the purpose of limiting the buffer inner core 2 by the outer shell 1 can be achieved.

[0073] Furthermore, in combination with Figure 1 , Figures 9 to 13 As shown, a plurality of limiting bosses 52 are arranged on the outer periphery of the positioning ring 5, and the second housing 12 has a plurality of limiting grooves 121. The limiting bosses 52 can extend into the limiting grooves 121 and slide in the limiting grooves 121 so that the limiting bosses 52 can be switched between a first position and a second position. When the limiting boss 52 is placed in the first position, the limiting boss 52 is located at the opening of the limiting groove 121 to enter or disengage from the limiting groove 121, and the buffer inner core 2 can be separated from the positioning ring 5. When the limiting boss 52 is located in the second position, the buffer inner core 2 is limited from rotating by the positioning ring 5 and the second housing 12. In this way, it is convenient for the positioning and installation of the buffer inner core 2.

[0074] Furthermore, in order to prevent the buffer inner core 2 from being affected by water flow during the operation of the noise reduction device and rotating from the second position to the first position, resulting in the separation of the buffer inner core 2 from the positioning ring 5, a locking protrusion 122 is further arranged on the groove wall of the limiting groove 121. When the limiting groove 121 is in the first position, the locking protrusion 122 is located between the first position and the second position. The width of the position where the locking protrusion 122 is arranged in the limiting groove 121 is reduced. Rotate the second housing 12, and the limiting boss 52 slides over the locking protrusion 122.

[0075] Specifically, a first installation transition surface 521 is provided on the side of the limiting boss 52 facing the second position, and a second installation transition surface 1221 is provided on the side of the locking protrusion 122 facing the first position. In the process of rotating the second shell 12, the first installation transition surface 521 and the second installation transition surface 1221 can fit together. That is, the first installation transition surface 521 and the second installation transition surface 1221 cooperate with each other so that the limiting boss 52 passes over the locking protrusion 122 and enters the second position. For example, along the direction from the first position to the second position, the locking protrusion 122 is arranged at the side wall of the limiting groove 121 close to the buffer inner core 2, and the distance between the first installation transition surface 521 and the bottom surface tends to gradually increase. In this way, it is convenient for the limiting boss 52 to pass over the locking protrusion 122 and be located in the second position, and the side wall of the limiting protrusion 111 away from the second position is a vertical side wall, so that the locking protrusion 122 can achieve the purpose of locking the limiting boss 52.

[0076] Specifically, the limiting groove 121 is an L-shaped groove, and one end of the L-shaped groove passes through the end face of the positioning ring 5 toward the buffer inner core 2. This ensures that when the limiting boss 52 moves from the first position to the second position, part of the positioning ring 5 can produce elastic deformation, so that the limiting boss 52 passes over the locking protrusion 122 and is located in the second position.

[0077] It should be noted that the inner diameter d3 of the inner cavity of the first shell 11 is ≥ 40 mm. On the one hand, it is necessary to ensure that the annular water flow cross-sectional area S2 is ≥ the water flow area S of the heat exchanger pipeline after matching with the buffer inner core 2, that is, S2 ≥ S, where:

[0078] S2=S3-S1=π×(d_3 / 2)2-S1, S=113mm.

[0079] like Figure 9 and Figure 13 As shown, during installation, first squeeze the limiting boss 52 into the limiting groove 121 along the installation line and rotate it. At this time, the limiting flange 24 of the buffer inner core 2 is in the maximum compression state. After rotating into place, release the positioning ring 5, the limiting flange 24 rebounds, supports the limiting boss 52, and the locking protrusion 122 blocks the limiting boss 52 and cannot rotate to complete the limiting. At this time, the limiting flange 24 is in the minimum compression state. At this time, the buffer inner core 2, the positioning ring 5 and the second shell 12 are assembled to obtain assembly one. It should be noted that the limiting flange 24 also plays the role of a sealing ring.

[0080] Then, the buffer outer core 3 is extended into the first shell 11 so that the limiting protrusion 111 enters the limiting hole 32, and the buffer outer core 3 and the first shell 11 are assembled to obtain the second assembly.

[0081] Finally, a part of the assembly body is inserted into the second assembly body, and the first shell 11 and the second shell 12 are fastened and connected by screws to complete the assembly.

[0082] Since the buffer inner core 2 and the buffer outer core 3 are made of rubber materials, if the buffer inner core 2 is broken or the recess 33 of the buffer outer core 3 is severely deformed and cannot be restored, the effect of the water pump noise reduction device in attenuating the water pump pressure pulsation becomes poor, and the expected noise reduction effect cannot be achieved.

[0083] In view of the above situation, in the embodiments of the present application, a method for detecting a noise reduction device is further provided, which is applied to the noise reduction device described in the above embodiments, as Figure 14 shown, and includes the following steps:

[0084] S101. During the working process, the water outlet pressure fluctuation difference △P of the noise reduction device is obtained in real time 实 , and the water outlet pressure fluctuation difference △P 实 is the pressure fluctuation difference between the front and rear water outlet pressures obtained at adjacent preset times.

[0085] The preset time is set according to needs. Usually, the preset time can be selected as 10 s.

[0086] S102. Compare the relationship between △P 实 and the preset range, and judge whether the noise reduction device is working normally, failed or blocked according to the comparison result.

[0087] By obtaining the water outlet pressure fluctuation difference of the noise reduction device in real time and comparing the real-time obtained water outlet pressure fluctuation difference with the preset range, it is possible to compare whether the pressure drop decreases after the water passes through the noise reduction device, and further detect whether the buffer inner core 2 and the buffer outer core 3 are working normally.

[0088] Specifically, comparing the relationship between △P 实 and the preset range, and judging whether the noise reduction device is working normally, failed or blocked according to the comparison result includes:

[0089] If △P 实 is within the first preset range, the noise reduction device is working normally;

[0090] If △P 实 is within the second preset range, the noise reduction device fails;

[0091] If △P 实 is not within the first preset range and not within the second preset range, the noise reduction device is blocked;

[0092] The maximum value of the first preset range is less than the minimum value of the second preset range.

[0093] The first preset range and the second preset range are obtained through experiments. For example, the pressure sensor 4 collects the water flow pressure numerical curve at the water outlet 101 of the noise reduction device and calculates the pressure fluctuation difference △P1 = P 1max -P 1min ; and the first preset range is [P 1 -α, P 1 +α].

[0094] Remove the buffer inner core 2 and the buffer outer core 3 of the water pump noise reduction device. In the absence of the buffer inner core 2 and the buffer outer core 3, the first housing 11 and the second housing 12 form an expansion muffler structure, which generates a cross-sectional expansion ratio with the main waterway cross-section and has a partial buffering effect on the water flow pressure pulsation. Collect the water flow pressure numerical curve at the water outlet end of the water pump noise reduction device without the buffer inner core 2 and the buffer outer core 3 and calculate the pressure fluctuation difference △P2 = P 2max -P 2min ; and the second preset range is [P 2 -β, P 2 +β]. It should be noted that △P 1 <△P 2 , and α and β are obtained through experiments.

[0095] During the working process, start the preheating cycle function of the water heater, and the main controller supplies power to start the pressure sensor 4 to detect the pressure fluctuation difference data in real time. When the real-time water outlet pressure fluctuation difference △P 实 is within the first preset range [P 1 -α, P 1 +α], it indicates that the noise reduction device is working properly; when the real-time water outlet pressure fluctuation difference △P is within the second preset range [P 2 -β, P 2 +β], it indicates that the buffer inner core 2 is broken or the recessed part 33 of the buffer outer core 3 fails, and it needs to be disassembled and replaced and assembled in place; when the real-time water outlet pressure fluctuation difference is not within the two preset ranges, it may be due to blockage or other reasons, and it needs to be disassembled for analysis.

[0096] As Figure 15 shown, the method specifically includes the following steps:

[0097] S201. Obtain the water outlet pressure fluctuation difference △P of the noise reduction device in real time during the working process 实 , and the water outlet pressure fluctuation difference △P 实 is the pressure fluctuation difference between the front and rear water outlet pressures obtained within a preset time

[0098] S202. △P 实Is it within the first preset range? If so, execute step S203; if not, execute step S204;

[0099] S203. The noise reduction device works normally;

[0100] S204. △P 实 Is it within the second preset range? If so, execute step S205; if not, execute step S206;

[0101] S205. The noise reduction device fails;

[0102] S206. The noise reduction device is blocked.

[0103] In the specific content of the above specific embodiments, the technical features can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not exist in contradiction, they should all be considered as the scope recorded in this specification.

[0104] The specific content of the above specific embodiments only expresses several embodiments of the present invention, and its description is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention should be subject to the appended claims.

Claims

1. A noise reduction device, characterized in that, comprising: a housing (1) forming a first accommodation chamber, the housing (1) having a water outlet (101) and a water inlet (102); a buffer inner core (2) and a buffer outer core (3), the buffer outer core (3) being limited within the first accommodation chamber, the buffer outer core (3) having a first water outlet hole (31) and a second accommodation chamber for accommodating the buffer inner core (2), the buffer outer core (3) being recessed with a plurality of recessed portions (33) in the circumferential direction towards the buffer inner core (2), the buffer inner core (2) being a barrel-shaped structure with one end open, the sealed end of the buffer inner core (2) extending into the second accommodation chamber, the opening of the buffer inner core (2) being communicatively arranged with the water inlet (102) of the housing (1), and a plurality of columns of second water outlet holes (21) being circumferentially arranged on the buffer inner core (2), and each column of the second water outlet holes (21) facing the same recessed portion (33).

2. The noise reduction device according to claim 1, characterized in that, the noise reduction device further comprises a pressure sensor (4) arranged at the water outlet (101) of the housing (1), and the pressure sensor (4) is configured to detect the pressure of the water flow at the water outlet (101).

3. The noise reduction device according to claim 1, characterized in that, along the axial direction of the housing (1), any of the second water outlet holes (21) of the buffer inner core (2) facing the water outlet (101) is arranged higher than the water outlet (101).

4. The noise reduction device according to claim 1, characterized in that, the housing (1) comprises a first housing body (11) and a second housing body (12) fixedly connected, a plurality of limiting protrusions (111) are arranged on the inner wall of the first housing body (11), a plurality of limiting holes (32) are arranged on the buffer outer core (3), the limiting protrusions (111) and the limiting holes (32) are arranged in one-to-one correspondence, and the limiting protrusions (111) extend into the corresponding limiting holes (32) to limit the rotation of the buffer outer core (3) relative to the housing (1).

5. The noise reduction device according to claim 4, characterized in that, the noise reduction device further comprises a positioning ring (5) for limiting the buffer inner core (2), a plurality of limiting ribs (23) are arranged on the outer periphery of the buffer inner core (2), a plurality of limiting notches (51) are arranged on the inner periphery of the positioning ring (5), the sealed end of the buffer inner core (2) passes through the positioning ring (5) so that the limiting ribs (23) are located in the limiting notches (51), and a limiting flange (24) extends along the outer periphery of the buffer inner core (2) at the open end of the buffer inner core (2), and the bottom surface of the limiting flange (24) contacts the top surface of the positioning ring (5).

6. The noise reduction device according to claim 5, characterized in that, A plurality of limiting bosses (52) are provided on the outer periphery of the positioning ring (5). The second housing (12) has a plurality of limiting grooves (121). The limiting grooves (121) are arranged in one-to-one correspondence with the limiting bosses (52). The limiting bosses (52) can extend into the limiting grooves (121) and slide in the limiting grooves (121) so that the limiting bosses (52) can be switched between a first position and a second position. When the limiting bosses (52) are in the first position, the limiting bosses (52) are located at the openings of the limiting grooves (121) to enter or disengage from the limiting grooves (121). When the limiting bosses (52) are in the second position, the buffer inner core (2) is limited from rotating by the positioning ring (5) and the second housing (12).

7. The noise reduction device according to claim 6, wherein, locking protrusions (122) are further provided on the groove walls of the limiting grooves (121). The locking protrusions (122) are arranged between the first position and the second position. The width of the position of the limiting groove (121) where the locking protrusion (122) is provided is reduced. By rotating the second housing (12), the limiting boss (52) slides over the locking protrusion (122).

8. The noise reduction device according to claim 7, wherein, a first installation transition surface (521) is provided on one side of the limiting boss (52) facing the second position, and a second installation transition surface (1221) is provided on one side of the locking protrusion (122) facing the first position. During the process of rotating the second housing (12), the first installation transition surface (521) and the second installation transition surface (1221) can be attached to each other.

9. The noise reduction device according to claim 1, wherein, at least a part of the first water outlet hole (31) is provided on the side wall of the buffer outer core (3) facing the water outlet (101).

10. A noise reduction device detection method, which is applied to the noise reduction device according to any one of claims 1-9, wherein, it includes the following steps: Obtain the water outlet pressure fluctuation difference △P of the noise reduction device in real time during the working process 实 , the water outlet pressure fluctuation difference △P 实 is the pressure fluctuation difference between the front and rear water outlet pressures obtained at adjacent preset times; Compare △P 实 with the preset range, and determine whether the noise reduction device is in normal operation, failure or blockage according to the comparison result.

11. The noise reduction device detection method according to claim 10, wherein, Compare △P 实 with the relationship of the preset range, and judge whether the noise reduction device is in normal operation, failure or blockage according to the comparison result, including: If △P 实 is within the first preset range, the noise reduction device works normally; If △P 实 is within the second preset range, the noise reduction device fails; If △P 实 is not within the first preset range and the second preset range, the noise reduction device is blocked; the maximum value of the first preset range is less than the minimum value of the second preset range.

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