Air inlet silencing structure and gas heating water heater

Abstract

The utility model discloses an air inlet noise reduction structure and gas heating water heater, the air inlet noise reduction structure comprises a noise reduction pipe and noise reduction cotton, the noise reduction pipe is provided with an air inlet end, an air buffer end and a connecting end, the air inlet end is provided with a trumpet-shaped air inlet, the air buffer end is of a round inverted L-shaped structure, and the connecting end is connected with the noise reduction cotton. The joining end is provided with a joining port for joining a premixer; the silencing cotton sleeve is arranged at one end of the air inlet end close to the air inlet. According to the air inlet noise reduction structure, through the structure that the noise reduction pipe is combined with the noise reduction cotton, the noise reduction cotton is used for absorbing noise generated by friction between air and the inner wall of the pipeline in the air inlet process, the air inlet noise is prevented from being further expanded through the pipeline, and through the action of the long and smooth noise reduction pipe, the air inlet noise is further reduced; the ignition deflagration sound of the subsequent water heater and the low-frequency noise generated during small fire combustion are reduced.

Description

Technical Field

[0001] This utility model relates to the field of air silencing technology, specifically to an air intake silencing structure and a gas-fired heating hot water boiler. Background Technology

[0002] In gas-fired heating and hot water boilers, a negative pressure is created in the premixer by a fan before the gas is burned. This draws air from inside the boiler into the premixer, and simultaneously, the gas proportional valve opens, allowing gas to enter. This ensures that the gas and air are fully premixed in the premixer. Fully premixed burners, because combustion is not limited by mixing time or space, offer advantages such as fast combustion speed, complete combustion, low nitrogen oxide emissions, and low noise, leading to their increasingly widespread use, especially in condensing water heaters and fully premixed gas-fired heating and hot water boilers.

[0003] Currently, the friction between air and the pipes as it enters the premixer causes significant noise, especially the ignition popping sound and low-frequency noise during low-fire combustion in the hot water heater, affecting the user experience. Existing technology discloses a silencer pipe structure that uses airflow disturbance holes to alter the airflow frequency and eliminate resonance-induced noise. However, in reality, these disturbance holes generate another type of low-frequency noise, resulting in the hot water heater still producing significant ignition popping sound and low-frequency noise during low-fire combustion. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide an air intake silencing structure to solve the above-mentioned traditional problems.

[0005] The second objective of this utility model is to provide a gas-fired heating and hot water boiler that adopts the air intake silencing structure.

[0006] One of the objectives of this utility model is achieved through the following technical solution:

[0007] An air intake silencing structure includes a silencing pipe and silencing cotton sleeved on the silencing pipe. The silencing pipe has an air intake end, an air buffer end, and a connecting end. The air intake end has a horn-shaped air inlet. The air buffer end has a smooth inverted L-shaped structure. The connecting end has a connecting port for connecting a premixer. The silencing cotton is sleeved on the end of the air intake end near the air inlet.

[0008] Preferably, the thickness of the sound-absorbing cotton is 0.2-0.5 times the outer diameter of the air inlet end.

[0009] Preferably, the sound-absorbing cotton is one or more of glass fiber cotton, polyester fiber cotton, and rock wool.

[0010] Preferably, the maximum inner diameter of the air inlet is 1.1-1.6 times the inner diameter of the air inlet end.

[0011] Preferably, the air buffer end includes a first elbow, a first buffer pipe section, a second elbow, a second buffer pipe section, a third elbow, a third buffer pipe section, and a fourth elbow. The first elbow is used to connect the first buffer pipe section to the air inlet end, the second elbow is used to connect the first buffer pipe section to the second buffer pipe section, the third elbow is used to connect the second buffer pipe section to the third buffer pipe section, and the fourth elbow is used to connect the third buffer pipe section to the connecting end.

[0012] Preferably, the air inlet, the first elbow, the first buffer pipe section, the second elbow, and the second buffer pipe section are connected in sequence to form an inverted U-shaped structure.

[0013] Preferably, the angle formed by the second buffer section and the third buffer section is 140°-165°.

[0014] Preferably, the length of the second buffer tube segment is greater than the length of the third buffer tube segment, and the angle formed by the third buffer tube segment and the connecting end is 80°-120°.

[0015] Preferably, the air intake silencing structure further includes a clamp, which is used to fix the connection between the connecting end and the premixer.

[0016] The second objective of this utility model is achieved by the following technical solution:

[0017] A gas-fired heating and hot water boiler includes the aforementioned air intake and silencing structure.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The air intake silencing structure of this utility model combines a silencing pipe with silencing cotton. The silencing cotton is used to absorb the noise generated by the friction between the air and the inner wall of the pipe during air intake, preventing the intake noise from being further amplified through the pipe. Furthermore, the long and smooth silencing pipe further reduces the noise generated by air intake, thereby reducing the ignition explosion sound of the subsequent hot water boiler and the low-frequency noise that occurs during small-flame combustion. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the air intake silencing structure of this utility model;

[0021] Figure 2 for Figure 1 An exploded view of the air intake silencer structure shown;

[0022] Figure 3 for Figure 1The diagram shown is a schematic of an air intake silencer structure installed on a gas-fired heating and hot water boiler.

[0023] Figure 4 This is a schematic diagram of gas flow inside a gas-fired heating and hot water boiler.

[0024] In the diagram: 100, Air intake silencer structure; 10, Silencer pipe; 11, Air inlet end; 110, Air inlet; 12, Air buffer end; 120, First elbow; 121, First buffer pipe section; 122, Second elbow; 123, Second buffer pipe section; 124, Third elbow; 125, Third buffer pipe section; 126, Fourth elbow; 13, Connecting end; 20, Sound-absorbing cotton; 30, Clamp; 200, Main heat exchanger; 300, Water pump; 400, Premixer; 500, Fan; 600, Proportional valve. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In the description of this utility model, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0028] Please see Figures 1-4The present invention provides a preferred embodiment of an air intake silencing structure 100, which is used to install in a gas-fired heating and hot water boiler to reduce noise generated during air intake, especially reducing the ignition explosion sound and low-frequency noise generated during the small flame combustion of the hot water boiler. Specifically, the air intake silencing structure 100 includes a silencing pipe 10 and silencing cotton 20 sleeved on the silencing pipe 10. The silencing pipe 10 has an air intake end 11, an air buffer end 12, and a connecting end 13. The air intake end 11 has a horn-shaped air inlet 110. The air buffer end 12 is roughly in a smooth inverted L-shaped structure, allowing air to pass through a relatively long smooth pipe, further reducing the noise generated by air intake. The connecting end 13 has a connection port for connecting a premixer 400. The silencing cotton 20 is sleeved on the end of the air intake end 11 near the air inlet 110 to absorb the noise generated by the friction between the air intake and the inner wall of the pipe, so as to prevent the intake noise from being further amplified through the pipe.

[0029] In this embodiment, the thickness of the sound-absorbing cotton 20 is 0.2-0.5 times the outer diameter of the air inlet end 11, such as 0.2, 0.3, 0.4, 0.5, etc. The sound-absorbing cotton 20 is one or more of glass fiber cotton, polyester fiber cotton, and rock wool. Different sound-absorbing materials are selected according to specific sound absorption requirements, such as the influence of pore density and fiber elasticity on sound absorption efficiency.

[0030] In one embodiment, the maximum inner diameter of the air inlet 110 is 1.1 to 1.6 times the inner diameter of the air inlet end 11, such as 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, etc., so that air can smoothly enter the silencer pipe 10 and reduce the friction between the air and the pipe wall.

[0031] In this embodiment, in order to make full use of the space inside the hot water heater and to preheat the air, the air inlet 110 of the air inlet end 11 is set downwards, such as... Figure 3As shown, the air inlet 110 of the air inlet end 11 faces the fan 500, so that the air buffer end 12 spans the burner 300. It can absorb the heat radiated from the burner 300 and the fan 500, so that the airflow in the furnace can flow better inside, thereby reducing the temperature inside the furnace. The air buffer end 12 includes a first elbow 120, a first buffer pipe section 121, a second elbow 122, a second buffer pipe section 123, a third elbow 124, a third buffer pipe section 125, and a fourth elbow 126. The first elbow 120 is used to connect the first buffer pipe section 121 and the air inlet end 11, and the second elbow 122... The first buffer pipe section 121 and the second buffer pipe section 123 are connected by a third elbow 124, which is used to connect the second buffer pipe section 123 and the third buffer pipe section 125. The fourth elbow 126 is used to connect the third buffer pipe section 125 and the connecting end 13, so that the silencer pipe 10 is smoothly connected, has good sealing performance, and good air flow, so as to achieve a further silencing effect. In one embodiment, the air inlet end 11, the first elbow 120, the first buffer pipe section 121, the second elbow 122, and the second buffer pipe section 123 are connected in sequence to form an inverted U-shaped structure, so that the silencer pipe 10 can have a longer silencing length. The angle formed by the second buffer section 123 and the third buffer section 125 is an obtuse angle. By changing the airflow angle in advance, the airflow speed is slowed down. Optionally, the angle formed by the second buffer section 123 and the third buffer section 125 is 140°-165°, such as 140°, 150°, 160°, 165°, etc. Preferably, the angle formed by the second buffer section 123 and the third buffer section 125 is 160°.

[0032] In this embodiment, the length of the second buffer tube segment 123 is greater than the length of the third buffer tube segment 125. The angle formed by the third buffer tube segment 125 and the connecting end 13 is 80°-120°, such as 80°, 90°, 100°, 110°, 120°, etc. The corresponding angle is selected according to the specific needs in order to better reduce noise.

[0033] In one embodiment, the air intake silencing structure 100 further includes a clamp 30 for securing the connection between the connecting end 13 and the premixer 400.

[0034] In other embodiments, the present invention also provides a gas-fired heating and hot water boiler, which includes a main heat exchanger 200, a burner, a water pump 300, a premixer 400, a fan 500, a proportional valve 600, and the aforementioned air intake silencing structure 100. The connecting end 13 of the air intake silencing structure 100 is connected to the air intake part of the premixer 400 and fixed by a clamp 30, so that it has a good silencing effect.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An air intake sound deadening structure characterized by comprising: It includes a muffler and sound-absorbing cotton sleeved on the muffler. The muffler has an air inlet, an air buffer, and a connecting end. The air inlet has a horn-shaped air inlet. The air buffer has a smooth inverted L-shaped structure. The connecting end has a connecting port for connecting to a premixer. The sound-absorbing cotton is sleeved on the end of the air inlet near the air inlet.

2. The air intake sound deadening structure according to claim 1, characterized by, The thickness of the sound-absorbing cotton is 0.2-0.5 times the outer diameter of the air inlet.

3. The air intake sound deadening structure according to claim 2, characterized by, The sound-absorbing cotton is one or more of glass fiber cotton, polyester fiber cotton, and rock wool.

4. The air intake sound attenuating structure of claim 1, wherein The maximum inner diameter of the air inlet is 1.1-1.6 times the inner diameter of the air inlet end.

5. The air intake sound attenuating structure of claim 1, wherein, The air buffer end includes a first elbow, a first buffer pipe section, a second elbow, a second buffer pipe section, a third elbow, a third buffer pipe section, and a fourth elbow. The first elbow is used to connect the first buffer pipe section to the air inlet end, the second elbow is used to connect the first buffer pipe section to the second buffer pipe section, the third elbow is used to connect the second buffer pipe section to the third buffer pipe section, and the fourth elbow is used to connect the third buffer pipe section to the connecting end.

6. The air intake sound attenuating structure of claim 5, wherein, The air inlet, the first elbow, the first buffer pipe section, the second elbow, and the second buffer pipe section are connected in sequence to form an inverted U-shaped structure.

7. The air intake sound attenuating structure of claim 5, wherein, The angle formed by the second and third buffer sections is 140°-165°.

8. The air intake sound attenuating structure of claim 5, wherein, The length of the second buffer tube segment is greater than the length of the third buffer tube segment, and the angle formed between the third buffer tube segment and the connecting end is 80°-120°.

9. The air intake sound attenuating structure of claim 1, wherein, The air intake silencing structure also includes a clamp, which is used to fix the connection between the connecting end and the premixer.

10. A combination gas fired central heating and water heating appliance, characterised in that, Includes the air intake silencing structure as described in any one of claims 1-9.

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