Silencer and gas wall-hanging stove

Abstract

The utility model relates to the technical field of hot water supply equipment, and discloses a silencer and a gas wall-hanging stove. The silencer comprises a silencer pipe body, and the silencer pipe body is provided with a first air inlet, a second air inlet, an air outlet and an airflow channel; the first air inlet and the air outlet are located in the two ends of the silencer pipe body correspondingly, and the first air inlet and the second air inlet communicate with the air outlet through airflow channels correspondingly. The second air inlet is located in an air inlet path between the first air inlet and the air outlet, and the opening area of the first air inlet is larger than that of the second air inlet. Compared with a single air inlet path, the first air inlet and the second air inlet can divide the airflow entering the silencer pipe body, so that the airflow entering from the first air inlet can enter the silencer pipe body at a relatively low flow speed, and vibration noise generated when the airflow at the too high flow speed impacts the inner wall of the silencer pipe body is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hot water supply equipment technology, and in particular to a silencer and a gas wall-hung boiler. Background Technology

[0002] A gas-fired wall-hung boiler is a device that supplies hot water. Its working principle primarily relies on the heat generated by the combustion of gas and air, which is transferred to the water in the circulation system via a heat exchanger, thus achieving the corresponding heating and hot water supply functions. In this process, the air required for gas combustion is generally provided by a fan inside the boiler. However, when the fan is running, a negative pressure is created at the fan inlet, drawing in air, which often generates considerable noise. Therefore, existing solutions involve installing a silencer pipe at the fan inlet, using sound-absorbing cotton inside to absorb the noise transmitted from the fan inlet. However, the high-speed airflow impacting the inner wall of the silencer pipe also causes vibration, resulting in significant noise from the silencer pipe itself and affecting the user's experience. Utility Model Content

[0003] The first technical problem solved by this utility model is to provide a silencer that effectively solves the problem of excessive noise generated by the silencer pipe when the fan is working in existing gas wall-hung boilers.

[0004] The second technical problem solved by this utility model is to provide a gas wall-hung boiler that effectively solves the problem of excessive noise generated by the silencer pipe when the fan is working in existing gas wall-hung boilers.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A muffler includes: a muffler tube body, the muffler tube body having a first air inlet, a second air inlet, an air outlet, and an airflow channel; the first air inlet and the air outlet are respectively located at both ends of the muffler tube body, the first air inlet and the second air inlet are respectively connected to the air outlet through the airflow channel; the second air inlet is located on the air intake path between the first air inlet and the air outlet, and the opening area of ​​the first air inlet is larger than the opening area of ​​the second air inlet.

[0007] Compared with the prior art, the silencer described in this utility model has the following advantages:

[0008] Taking a gas-fired wall-hung boiler as an example, when using this silencer, one end of the silencer tube has a first air inlet, and the other end has an air outlet. A second air inlet is located in the air intake path between the first and second air inlets. The air outlet is connected to the air inlet of the gas-fired wall-hung boiler's fan. Outside air enters the silencer tube simultaneously from both the first and second air inlets, flows out from the outlet, and then flows into the fan's air inlet. This disperses the originally concentrated, high-velocity airflow into two streams. In this way, the airflow velocity in the air intake path between the first and second air inlets is reduced, without increasing the overall volume of the silencer tube. This design ensures that the airflow entering from the first air inlet can enter the muffler tube at a relatively slow speed, reducing the vibration noise generated by the airflow impacting the inner wall of the muffler tube due to excessively fast airflow. This reduces the significant vibration noise generated by the muffler tube. At the same time, the opening area of ​​the first air inlet is larger than that of the second air inlet, reducing the noise at the outlet from being transmitted through the second air inlet along the air intake path between the second air inlet and the outlet. This attenuates the propagation of more noise at the outlet along the air intake path between the first air inlet and the outlet, further reducing the noise transmitted from the first air inlet of the muffler tube.

[0009] In one embodiment, the flow area of ​​the airflow channel in the pipe section of the muffler body where the second air inlet is located is larger than the opening area of ​​the second air inlet.

[0010] In one embodiment, the second air inlet is disposed opposite to the air outlet, and both the second air inlet and the air outlet are located on the side wall of the muffler tube.

[0011] In one embodiment, the orthographic projection of the second air inlet toward the air outlet is located inside the air outlet.

[0012] In one embodiment, the ratio of the opening area of ​​the second air inlet to the opening area of ​​the air outlet ranges from 1:2.5 to 1:8.

[0013] In one embodiment, the muffler body includes a muffler body and a first pipe section and a second pipe section disposed at opposite ends of the muffler body. The internal cross-sectional area of ​​the muffler body is larger than the internal cross-sectional area of ​​the first pipe section. The first air inlet is formed at the end of the first pipe section away from the muffler body. The internal cross-sectional area of ​​the muffler body is larger than the internal cross-sectional area of ​​the second pipe section. The air outlet and the second air inlet are disposed on opposite sidewalls of the second pipe section.

[0014] In one embodiment, the internal cross-sectional area of ​​the first air inlet corresponding to the first pipe section decreases along the airflow direction.

[0015] In one embodiment, the second pipe section has an arc-shaped structure, and the air outlet is located on the side wall of the first pipe section away from the muffler body.

[0016] In one embodiment, the second pipe section is further provided with a pressure tap, which is located between the muffler body and the air outlet; the muffler body is provided with a sound-absorbing component, the outer surface of which is in contact with the inner wall of the muffler body.

[0017] In one embodiment, the muffler tube includes a first cover and a second cover, which are connected by a snap-fit.

[0018] The second technical problem mentioned above is solved by the following technical solution:

[0019] A gas-fired wall-hung boiler includes:

[0020] The fan has an air inlet;

[0021] Premixer;

[0022] The aforementioned silencer has its outlet connected to the air inlet of the fan via the premixer.

[0023] Compared with the prior art, the gas wall-hung boiler described in this utility model has the following beneficial effects: the gas wall-hung boiler equipped with this silencer has a significantly better noise reduction effect than existing gas wall-hung boilers. Specifically, one end of the silencer tube is provided with a first air inlet, and the other end is provided with an air outlet. A second air inlet is located on the air intake path between the first air inlet and the air outlet. The air outlet is connected to the air inlet of the gas wall-hung boiler's fan. Outside air enters the silencer tube simultaneously from the first air inlet and the second air inlet, flows out from the air outlet, and then flows into the air inlet of the fan. This disperses the originally concentrated and high-velocity airflow into two airflows. In this way, the airflow velocity in the air intake path between the first air inlet and the second air inlet is reduced. Without increasing the overall volume of the silencer tube, the airflow velocity from the first air inlet is reduced. The airflow entering the muffler tube can enter the interior of the muffler tube at a relatively slow flow rate, reducing the vibration noise generated by the airflow impacting the inner wall of the muffler tube due to excessively fast airflow. This reduces the large vibration noise generated by the muffler tube. At the same time, the opening area of ​​the first air inlet is larger than that of the second air inlet, reducing the noise at the outlet from being transmitted from the second air inlet along the air intake path between the second air inlet and the outlet. This attenuates the propagation of more noise at the outlet along the air intake path between the first air inlet and the outlet, further reducing the noise transmitted from the first air inlet of the muffler tube. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a gas-fired wall-hung boiler according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the silencer shown;

[0027] Figure 3 for Figure 2 A schematic diagram of the structure of the first cover of the muffler shown;

[0028] Figure 4 for Figure 2 The diagram shows the structure of the second cover of the muffler.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Muffler pipe body; 101. Muffler main body; 102. First pipe section; 1021. First air inlet; 103. Second pipe section; 1031. Second air inlet; 1032. Air outlet; 1033. Pressure tap; 104. First cover; 105. Second cover;

[0031] 10. Silencer; 20. Premixer; 30. Fan. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] To address the problem of excessive noise generated by the silencer pipe during the operation of the fan in existing gas-fired wall-hung boilers, this utility model provides a silencer and a gas-fired wall-hung boiler.

[0037] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0038] According to embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a muffler 10 is provided, comprising: a muffler tube 1, the muffler tube 1 having a first air inlet 1021, a second air inlet 1031, an air outlet 1032 and an airflow channel; the first air inlet 1021 and the air outlet 1032 are respectively located at both ends of the muffler tube, the first air inlet 1021 and the second air inlet 1031 are respectively connected to the air outlet 1032 through the airflow channel; the second air inlet 1031 is located on the air intake path between the first air inlet 1021 and the air outlet 1032, and the opening area of ​​the first air inlet 1021 is larger than the opening area of ​​the second air inlet 1031.

[0039] Taking a gas-fired wall-hung boiler as an example, when using this silencer, one end of the silencer pipe 1 is provided with a first air inlet 1021, and the other end is provided with an air outlet 1032. The second air inlet 1031 is located on the air intake path between the first air inlet 1021 and the air outlet 1032. The air outlet 1032 is connected to the air inlet of the gas-fired wall-hung boiler fan. Outside air enters the silencer pipe 1 simultaneously from the first air inlet 1021 and the second air inlet 1031, flows out from the air outlet 1032, and flows into the air inlet of the fan, thus dispersing the originally concentrated and high-velocity airflow into two airflows. In this way, the airflow velocity in the air intake path between the first air inlet 1021 and the second air inlet 1031 is reduced, without increasing the noise reduction. Based on the overall volume of the muffler tube, the airflow entering from the first air inlet 1021 can enter the interior of the muffler tube 1 at a relatively slow flow rate, reducing the vibration noise generated by the airflow impacting the inner wall of the muffler tube 1 due to excessively fast flow rate. This reduces the large vibration noise generated by the muffler tube 1. In addition, the opening area of ​​the first air inlet 1021 is larger than the opening area of ​​the second air inlet 1031, reducing the noise at the outlet 1032 from being transmitted from the second air inlet 1031. This attenuates the propagation of more noise at the outlet 1032 through the air intake path between the first air inlet 1021 and the outlet 1032, further reducing the noise transmitted from the first air inlet 1021 of the muffler tube 1.

[0040] Furthermore, the opening area of ​​the second air inlet 1031 is smaller than the flow area of ​​its corresponding airflow channel. On the one hand, this reduces the noise at the outlet 1032 from being transmitted through the second air inlet 1031, thus attenuating the propagation of more noise at the outlet 1032 along the air intake path between the first air inlet 1021 and the outlet 1032. On the other hand, after the airflow enters the muffler tube 1 through the second air inlet 1031, the flow area of ​​the airflow suddenly increases. According to the relevant principles of fluid mechanics, the sudden increase in the flow area will cause the airflow velocity to decrease rapidly. Therefore, the noise generated when the airflow entering the muffler tube 1 through the second air inlet 1031 collides and rubs against the inner wall of the muffler tube 1 during its subsequent flow in the muffler tube 1 will decrease accordingly. Furthermore, since the airflow velocity entering the muffler body through the second air inlet 1031 will decrease, when the airflow in other areas flows to the vicinity of the second air inlet 1031 through the airflow channel, the airflow in other areas will also be affected by the airflow in that area and its velocity will decrease. In addition, the air outlet 1032 is located close to the second air inlet 1031, which also reduces the airflow velocity in the area of ​​the air outlet 1032, thereby further improving the muffler effect of the muffler 10.

[0041] It should be noted that in this embodiment, the air outlet on the silencer pipe 1 is ultimately connected to the air inlet of the blower 30 in the gas wall-hung boiler. Therefore, by utilizing the first air inlet 1021 and the second air inlet 1031 on the silencer pipe, the airflow entering from the first air inlet 1021 can enter the interior of the silencer pipe 1 at a relatively slow flow rate, reducing the vibration noise generated by the airflow impacting the inner wall of the silencer pipe 1 due to excessively fast flow rate. This achieves the effect of silencing airflow noise and improves the user experience.

[0042] In one embodiment, such as Figure 2 As shown, the second air inlet 1031 and the air outlet 1032 are arranged opposite to each other. The orthographic projection of the second air inlet 1031 toward the air outlet 1032 is located inside the air outlet 1032. Both the second air inlet 1031 and the air outlet 1032 are located on the side wall of the muffler tube 1. This configuration, on the one hand, extends the air intake path between the first air inlet 1021 and the second air inlet 1031, reducing vibration noise caused by excessively fast airflow impacting the inner wall of the muffler tube 1. On the other hand, it allows the airflow entering the muffler tube 1 through the second air inlet 1031 to directly enter the fan 30 through the air outlet 1032. Compared to using other components for the second air inlet 1031 on the muffler tube 1, this layout simplifies the airflow path within the muffler tube 1. The air intake direction of the second air inlet 1031 is perpendicular to the airflow direction of the section of the muffler tube 1 where the second air inlet 1031 is located. Therefore, the airflow from the second air inlet 1031 impacts the section of the muffler tube 1 where the second air inlet 1031 is located perpendicular to the airflow direction of the pipe section of the muffler tube 1. The airflow in the pipe section airflow channel of the second air inlet 1031 is located in the pipe section airflow channel of the muffler pipe body 1. The airflow direction is deflected and guided to the air outlet 1032, which reduces the noise generated by the airflow directly impacting the end of the muffler pipe body 1 and then flowing to the air outlet 1032. At the same time, the airflow energy at the air outlet 1032 is dissipated, thereby reducing the airflow noise. On the other hand, the orthogonal projection of the second air inlet 1031 toward the air outlet 1032 is located inside the air outlet 1032, which reduces the noise at the air outlet 1032 from being transmitted from the second air inlet 1031. This causes more noise at the air outlet 1032 to be attenuated in the propagation of the air intake path between the first air inlet 1021 and the air outlet 1032, further reducing the noise transmitted from the first air inlet 1021 of the muffler pipe body 1.

[0043] Furthermore, compared to placing the air outlet 1032 at the end of the silencer tube 1, placing the air outlet 1032 on the side wall of the silencer tube 1 allows for direct connection of the silencer 10 to the fan 30 without increasing the length of the silencer tube 1 or adding any bends. This not only simplifies the structure of the silencer 10 itself, making the overall structure of the gas wall-hung boiler equipped with the silencer 10 more compact, but also improves the ease of assembling the silencer 10 and the fan 30 together.

[0044] It is understood that in this embodiment, the number of second air outlets 1032 can be one or more, as long as they can cooperate with the first air inlet 1021 to achieve the effect of diverting and reducing pressure, and the orthogonal projection of the second air inlet 1031 toward the air outlet 1032 is located within the air outlet 1032. This utility model does not impose specific limitations on this.

[0045] In one example, such as Figure 2 As shown, there is one second air outlet 1032, and the second air outlet 1032 is coaxially arranged with the air outlet 1032.

[0046] In another example, there are multiple second air inlets 1031, and both the second air inlets 1031 and the air outlets 1032 are located on the side wall of the silencer tube 1. By providing multiple second air inlets 1031, this embodiment can disperse the airflow, reduce the energy carried by each airflow, reduce the impact of the airflow on the silencer tube 1 and the fan 30, and optimize the effect of flow diversion and pressure reduction.

[0047] In one embodiment, the ratio of the opening area of ​​the second air inlet 1031 to the opening area of ​​the air outlet 1032 ranges from 1:2.5 to 1:8. Preferably, the ratio ranges from 1:2.8 to 1:7. Setting the opening areas of the second air inlet 1031 and the air outlet 1032 within the above range allows the airflow to become a low-velocity airflow through the second air inlet 1031. Furthermore, it avoids the second air inlet 1031 having an excessively small opening area, which would cause the airflow to accelerate and generate noise when passing through the second air inlet 1031.

[0048] It should be noted that when there are multiple second air inlets 1031, in order to ensure the effect of flow diversion and pressure reduction, it is necessary to ensure that the ratio of the sum of the opening areas of multiple second air inlets 1031 to the opening area of ​​the air outlet 1032 is in the range of 1:2.5 to 1:8.

[0049] In one embodiment, such as Figures 2 to 4As shown, the muffler body 1 includes a muffler main body 101 and a first pipe section 102 and a second pipe section 103 located at opposite ends of the muffler main body 101. The internal cross-sectional area of ​​the muffler main body 101 is larger than that of the first pipe section 102. A first air inlet 1021 is formed at the end of the first pipe section 102 away from the muffler main body 101. The internal cross-sectional area of ​​the muffler main body 101 is larger than that of the second pipe section 103. An air outlet 1032 and a second air inlet 1031 are located on opposite sidewalls of the second pipe section 103. Because there is a difference between the internal cross-sectional area of ​​the muffler main body 101 and the internal cross-sectional areas of the first pipe section 102 and the second pipe section 103, when airflow enters the muffler main body 101 from the first pipe section 102, the airflow will be reflected due to the change in impedance. Through this reflection, the sound energy will be gradually dispersed and consumed, thereby reducing the sound energy radiated outward by the muffler 10, and ultimately achieving the effect of eliminating low and mid-frequency noise.

[0050] In one embodiment, such as Figures 2 to 4 As shown, the internal cross-sectional area of ​​the first air inlet 1021 corresponding to the first pipe section 102 decreases along the airflow direction. This arrangement facilitates the guidance of outside air into the muffler body 101, laying the foundation for subsequent air diversion and pressure reduction within the muffler 10.

[0051] In one embodiment, such as Figures 2 to 4 As shown, the second pipe section 103 has an arc-shaped structure, and the air outlet 1032 is located on the side wall of the first pipe section 102 away from the silencer body 101. Compared to a bent second pipe section 103, setting the second pipe section 103 in an arc shape can reduce the probability of noise generated by airflow colliding with the interior of the second pipe section 103, allowing the airflow to flow smoothly within the second pipe section 103. In addition, compared to setting the second pipe section 103 in a straight line, the arc-shaped second pipe section 103 allows the silencer 10 to more flexibly adapt to the shape and position of other surrounding components, making the installation of the silencer 10 in the gas wall-hung boiler more compact and reasonable. Furthermore, setting the air outlet 1032 on the side wall of the first pipe section 102 away from the silencer body 101 allows the silenced airflow to flow out at a suitable angle and direction, ensuring that it can match the air inlet of subsequent connected equipment, improving the connection compatibility and operational stability between equipment.

[0052] In one embodiment, such as Figures 2 to 4As shown, the second pipe section 103 is also equipped with a pressure tap 1033, which is located between the silencer body 101 and the air outlet 1032. The silencer body 101 contains a sound-absorbing component, the outer surface of which is adapted to the inner wall of the silencer body 101. The larger cross-section of the silencer body 101 provides a relatively spacious buffer space for the airflow, reducing the airflow velocity and initially dispersing the pressure, thus reducing the possibility of noise generation. The pressure tap 1033 on the second pipe section 103 allows for the collection of air pressure inside the silencer 10. Based on the collected air pressure information, the opening of the gas proportional valve can be adjusted appropriately to control the gas flow rate.

[0053] It should be noted that the pressure tap 1033 is located between the muffler body 101 and the air outlet 1032 because after the airflow enters the muffler 10 through the air inlet of the first pipe section 102, the airflow velocity decreases and then increases due to the change in the cross-sectional area inside the muffler 10. Therefore, the airflow velocity in the second pipe section 103 is the fastest in the entire muffler pipe. Thus, placing the pressure tap 1033 on the second pipe section 103 allows for the acquisition of the most accurate air pressure value inside the muffler 10. It should also be noted that in this embodiment, the pressure tap 1033 can be located on the same side of the second pipe section 103 as the air outlet 1032, or it can be located on different surfaces, as long as the air pressure value inside the second pipe section 103 can be obtained through the pressure tap 1033.

[0054] It is understandable that by incorporating sound-absorbing components within the muffler body, the noise reduction capability of the muffler 10 can be further enhanced. For example, the muffler body 101 contains sound-absorbing cotton, the outer surface of which is adapted to the inner surface of the muffler body 101. Furthermore, to prevent the sound-absorbing cotton from increasing the flow resistance of airflow within the muffler 10, at least one through-hole extending axially along the muffler body 101 and facilitating airflow passage can be provided on the sound-absorbing cotton.

[0055] In one embodiment, such as Figures 1 to 4 As shown, the muffler body 1 includes a first cover 104 and a second cover 105, which are connected by snap-fit ​​connections. This snap-fit ​​connection method makes the installation and removal of the muffler body 1 simple and quick.

[0056] According to embodiments of the present invention, such as Figure 1 As shown, on the other hand, a gas-fired wall-hung boiler is also provided, including: a fan 30, a premixer 20 and the aforementioned silencer 10.

[0057] Specifically, the fan 30 has an air inlet; the air outlet 1032 of the silencer 10 is connected to the air inlet of the fan 30 through the premixer 20.

[0058] The gas-fired wall-hung boiler equipped with this silencer 10 exhibits a significant noise reduction effect compared to existing gas-fired wall-hung boilers. Specifically, one end of the silencer tube 1 is provided with a first air inlet 1021, and the other end with an air outlet 1032. A second air inlet 1031 is located on the air intake path between the first air inlet 1021 and the air outlet 1032. The air outlet 1032 is connected to the air inlet of the gas-fired wall-hung boiler's fan. Outside air enters the silencer tube 1 simultaneously from the first air inlet 1021 and the second air inlet 1031, flows out from the air outlet 1032, and then flows into the air inlet of the fan. This disperses the originally concentrated, high-velocity airflow into two streams of airflow. As a result, the airflow velocity in the air intake path between the first air inlet 1021 and the second air inlet 1031 is reduced, without increasing the overall volume of the silencer tube. Based on this, the airflow entering from the first air inlet 1021 can enter the muffler tube 1 at a relatively slow flow rate, reducing the vibration noise generated by the airflow impacting the inner wall of the muffler tube 1 due to excessively fast flow rate. This reduces the large vibration noise generated by the muffler tube 1. In addition, the opening area of ​​the first air inlet 1021 is larger than the opening area of ​​the second air inlet 1031, reducing the noise at the outlet 1032 from being transmitted from the second air inlet 1031. This causes more noise at the outlet 1032 to be attenuated in the airflow path between the first air inlet 1021 and the outlet 1032, further reducing the noise transmitted from the first air inlet 1021 of the muffler tube 1.

[0059] Furthermore, the opening area of ​​the second air inlet 1031 is smaller than the flow area of ​​its corresponding airflow channel. This means that after the airflow enters the muffler body 1 through the second air inlet 1031, the flow area of ​​the airflow suddenly increases. According to the relevant principles of fluid mechanics, the sudden increase in flow area will cause the airflow velocity to decrease rapidly. Therefore, the noise generated when the airflow entering the muffler body 1 through the second air inlet 1031 collides and rubs against the inner wall of the muffler body 1 during its subsequent flow within the muffler body 1 will decrease accordingly. In addition, since the airflow velocity entering the muffler body through the second air inlet 1031 will decrease, when airflow from other areas flows to the vicinity of the second air inlet 1031 through the airflow channel, the airflow velocity in those areas will also be reduced due to the influence of the airflow in that area. Moreover, the proximity of the outlet 1032 to the second air inlet 1031 also reduces the airflow velocity in the outlet 1032 area, thereby further improving the muffler effect of the muffler 10.

[0060] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0061] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this 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. A silencer, characterized in that: include: A muffler tube (1) is provided with a first air inlet (1021), a second air inlet (1031), an air outlet (1032), and an airflow channel. The first air inlet (1021) and the air outlet (1032) are located at opposite ends of the muffler tube. The first air inlet (1021) and the second air inlet (1031) are connected to the air outlet (1032) through the airflow channel. The second air inlet (1031) is located on the air intake path between the first air inlet (1021) and the air outlet (1032). The opening area of ​​the first air inlet (1021) is larger than the opening area of ​​the second air inlet (1031).

2. The silencer according to claim 1, characterized in that: The flow area of ​​the second air inlet (1031) in the pipe section of the muffler pipe body (1) is larger than the opening area of ​​the second air inlet (1031).

3. The silencer according to claim 1, characterized in that: The second air inlet (1031) is arranged opposite to the air outlet (1032), and both the second air inlet (1031) and the air outlet (1032) are located on the side wall of the muffler tube (1).

4. The silencer according to claim 3, characterized in that: The orthographic projection of the second air inlet (1031) toward the air outlet (1032) is located inside the air outlet (1032); the ratio of the opening area of ​​the second air inlet (1031) to the opening area of ​​the air outlet (1032) is between 1:2.5 and 1:

8.

5. The muffler according to any one of claims 1 to 4, characterized in that: The muffler body (1) includes a muffler body (101) and a first pipe section (102) and a second pipe section (103) located at opposite ends of the muffler body (101). The internal cross-sectional area of ​​the muffler body (101) is larger than the internal cross-sectional area of ​​the first pipe section (102). The first air inlet (1021) is formed at the end of the first pipe section (102) away from the muffler body (101). The internal cross-sectional area of ​​the muffler body (101) is larger than the internal cross-sectional area of ​​the second pipe section (103). The air outlet (1032) and the second air inlet (1031) are located on opposite sidewalls of the second pipe section (103).

6. The silencer according to claim 5, characterized in that: The internal cross-sectional area of ​​the first pipe section (102) decreases from large to small along the airflow direction.

7. The silencer according to claim 5, characterized in that: The second pipe section (103) has an arc-shaped structure, and the air outlet (1032) is located on the side wall of the first pipe section (102) away from the muffler body (101).

8. The silencer according to claim 7, characterized in that: The second pipe section (103) is also provided with a pressure tap (1033), which is located between the muffler body (101) and the air outlet (1032); the muffler body (101) is provided with a sound-absorbing component, and the outer surface of the sound-absorbing component is in contact with the inner wall of the muffler body (101).

9. The silencer according to claim 1, characterized in that: The muffler tube body (1) includes a first cover (104) and a second cover (105), which are connected by snap-fit.

10. A gas-fired wall-hung boiler, characterized in that: include: The fan (30) has an air inlet; Premixer (20); According to any one of claims 1 to 9, the silencer (10) has an air outlet (1032) connected to the air inlet of the fan (30) via the premixer (20).

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