Cover body assembly and heat exchanger

Abstract

The cover body assembly comprises a cover body, the cover body is provided with a gas inlet channel and a gas channel, the two ends of the gas channel are correspondingly provided with a gas inlet and a gas outlet, the gas inlet is communicated with the gas inlet channel, and the gas outlet is used for being communicated with a combustion cylinder; wherein the fuel gas channel is provided with at least one section of narrowing part, the cross sectional area of the narrowing part is smaller than that of the fuel gas channel, and / or the fuel gas channel is provided with at least one section of expansion part, and the cross sectional area of the expansion part is larger than that of the fuel gas channel. Therefore, the change of acoustic impedance can be caused in the acoustic propagation process, and the reflection and interference phenomena of sound waves are generated, that is, the noise generated in the rapid flowing process of fuel gas can be reflected, interfered and the like at the narrowing part or the expansion part, so that the noise generated in the use process of the heat exchanger can be reduced. In addition, the invention further discloses the heat exchanger with the cover body assembly.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a cover assembly and a heat exchanger. Background Art

[0002] In the prior art, a heat exchanger used in a boiler or a wall-mounted boiler usually includes a shell and a cover assembly. The shell has a heat exchange cavity and an opening connected to the heat exchange cavity. Heat exchange tubes are installed in the heat exchange cavity. The cover assembly covers the opening and closes the heat exchange cavity. The cover assembly is provided with an air intake channel and a gas channel connected to the air intake channel. A combustion tube is also installed in the heat exchange cavity. The combustion tube is connected to the gas channel. A plurality of micropores are provided on the peripheral wall of the combustion tube. When in use, the gas can enter the combustion tube through the air intake channel and the gas channel, and then be ejected at high speed from the micropores on the peripheral wall of the combustion tube. The ignition needle is located on the outside of the combustion tube to ignite and burn the gas flowing out from the micropores. Thus, the gas can burn in the heat exchange cavity and heat the heat exchange tube.

[0003] However, when the gas is ejected at high speed from the micropores on the wall of the combustion tube, friction will occur between the high-speed gas and the micropore walls, thereby generating noise. At the same time, it will also cause the outer surface of the combustion tube to vibrate at a certain frequency. When this vibration frequency resonates with other parts of the boiler, it will also produce resonance noise, which seriously affects the user experience. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a cover assembly that can effectively reduce the noise generated at the combustion tube.

[0005] The present invention also provides a heat exchanger having the cover assembly.

[0006] According to an embodiment of the present invention, the cover body assembly includes: a cover body, provided with an air inlet channel and a gas channel, wherein an air inlet and an air outlet are correspondingly arranged at both ends of the gas channel, the air inlet is connected to the air inlet channel, and the air outlet is used to be connected to the combustion tube; wherein the gas channel has at least one narrowing portion, the cross-sectional area of ​​the narrowing portion is smaller than the cross-sectional area of ​​the gas channel, and / or the gas channel has at least one expansion portion, the cross-sectional area of ​​the expansion portion is larger than the cross-sectional area of ​​the gas channel.

[0007] The cover assembly according to the embodiment of the present invention has at least the following beneficial effects:

[0008] In the cover assembly of the embodiment of the present invention, at least one narrowing portion and / or expansion portion is arranged in the gas channel. Since the cross-sectional area of ​​the narrowing portion is smaller than the cross-sectional area of ​​the gas channel, and the cross-sectional area of ​​the expansion portion is larger than the cross-sectional area of ​​the gas channel, that is, the cross-sectional area of ​​the gas channel will suddenly change at the narrowing portion or the expansion portion, thereby causing a change in acoustic impedance during sound propagation, thereby generating reflection and interference of sound waves, that is, the noise generated at the combustion cylinder can be transmitted to the gas channel and reflect, interfere, etc. at the narrowing portion, thereby effectively reducing the noise generated during the use of the heat exchanger and improving the user experience.

[0009] According to some embodiments of the present invention, the air inlet passage is disposed on the cover body and extends outward relative to the cover body, and a cross-sectional area of ​​the air inlet port is smaller than a cross-sectional area of ​​the air inlet passage.

[0010] According to some embodiments of the present invention, the gas channel has at least two sections of the narrowing portions, and all the narrowing portions are arranged at intervals.

[0011] According to some embodiments of the present invention, the inner side wall of the gas channel is provided with a first narrowing structure corresponding to at least one group of the narrowing portions, and the first narrowing structure includes at least one first protrusion, which protrudes from the inner side wall of the gas channel and forms the side wall of the narrowing portion.

[0012] According to some embodiments of the present invention, the first narrowing structure includes two oppositely arranged first protrusions, the two first protrusions are correspondingly provided on two opposite side walls of the gas channel, and the narrowing portion is located between the corresponding two first protrusions.

[0013] According to some embodiments of the present invention, a guide plate is provided in the cover body, and the gas channel is formed by the guide plate and the inner peripheral wall of the cover body. In the first narrowing structure, one of the first protrusions is provided on the guide plate, and the other first protrusion is provided on the peripheral wall of the cover body and arranged opposite to the guide plate.

[0014] According to some embodiments of the present invention, the cover body includes a cover body and a sealing plate, the cover body is provided with a gas chamber and an opening connected to the gas chamber, the sealing plate is installed on the cover body and blocks the opening; the guide plate is provided on the inner wall of the gas chamber and abuts against the sealing plate, the gas channel is formed by the cover body, the sealing plate and the guide plate, the air inlet and the air inlet channel are both provided on the cover body, the air outlet is provided on the sealing plate, and the combustion tube can be installed on the sealing plate and connected to the air outlet.

[0015] According to some embodiments of the present invention, the inner side wall of the gas channel is provided with a second narrowing structure corresponding to at least one group of the narrowing portions, the second narrowing structure includes at least one second protruding portion, the second protruding portion is protruding from the inner wall of the gas chamber and abuts against the sealing plate, the second protruding portion and the guide plate are arranged at intervals and define the narrowing portion; the second protruding portion is provided with a first mounting hole for installing an ignition needle, the sealing plate is provided with a second mounting hole corresponding to the first mounting hole, and the ignition needle can be inserted into the second mounting hole.

[0016] According to some embodiments of the present invention, the sealing plate is provided with at least one first reinforcing rib, the first reinforcing rib is provided to protrude toward the gas passage, and at least one of the first reinforcing ribs is located in the narrowed portion.

[0017] The heat exchanger according to the embodiment of the present invention is provided with a cover assembly according to any one of the above embodiments.

[0018] The heat exchanger according to the embodiment of the present invention has at least the following beneficial effects:

[0019] By adopting the cover assembly of any of the above-mentioned embodiments, at least one narrowing portion and / or at least one expansion portion is arranged in the gas channel, so that the cross-sectional area of ​​the gas channel can change suddenly, thereby causing a change in acoustic impedance during sound propagation, so that the noise generated by the gas from the combustion tube can be transmitted through the combustion tube to the gas channel and reflect or interfere at the narrowing portion or the expansion portion, thereby effectively reducing the probability of the combustion tube generating noise when the gas is ejected from the micro-holes of the combustion tube at high speed and the probability of the combustion tube vibrating and resonating with other parts of the boiler to generate resonance noise, thereby reducing the noise generated by the heat exchanger during use and improving the user experience.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of a cover assembly according to an embodiment of the present invention;

[0023] Figure 2 is another schematic diagram of a cover assembly according to an embodiment of the present invention;

[0024] Figure 3 is an exploded schematic diagram of a cover assembly according to an embodiment of the present invention;

[0025] Figure 4 A cross-sectional schematic diagram of a cover assembly according to an embodiment of the present invention;

[0026] Figure 5 is another cross-sectional schematic diagram of a cover assembly according to an embodiment of the present invention;

[0027] Figure 6 is another cross-sectional schematic diagram of a cover assembly according to an embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of a cover body of a cover assembly according to an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of a sealing plate of a cover assembly according to an embodiment of the present invention;

[0030] Fig. 9 is a schematic diagram of a heat exchanger according to an embodiment of the present invention;

[0031] Fig.10 FIG. 4 is another schematic diagram of a heat exchanger according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] The cover 100, the cover body 110, the combustion chamber 111, the mounting portion 112, the sealing plate 120, the first reinforcing rib 121, the second reinforcing rib 122, the second mounting hole 123, the guide plate 130, the combustion tube 140, and the ignition needle 150;

[0034] Intake passage 200;

[0035] Gas channel 300, air inlet 310, air outlet 320, narrowing portion 330;

[0036] A first narrowing structure 400, a first protruding portion 410, a second protruding portion 420, and a first mounting hole 421;

[0037] Shell 500 , heat exchange chamber 510 , heat exchange tube 520 . DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0042] Reference Figures 1 to 6 An embodiment of the present invention provides a cover assembly, including a cover 100, wherein the cover 100 is provided with an air intake channel 200 and a gas channel 300, and an air intake port 310 and an air outlet port 320 are correspondingly provided at both ends of the gas channel 300, the air intake port 310 is connected with the air intake channel 200, and the air outlet port 320 is used to be connected with the combustion tube 140; wherein, the gas channel 300 has at least one narrowing portion 330, and the cross-sectional area of ​​the narrowing portion 330 is smaller than the cross-sectional area of ​​the gas channel 300.

[0043] In the cover assembly of the embodiment of the present invention, the gas can enter the gas channel 300 from the air inlet channel 200 and then flow to the gas outlet 320. The gas outlet 320 is used to communicate with the combustion tube 140, so that the gas at the gas outlet 320 can flow into the combustion tube 140 for ignition and combustion. At least one narrowing portion 330 is provided in the gas passage 300. Since the cross-sectional area of ​​the narrowing portion 330 is smaller than the cross-sectional area of ​​the gas passage 300, that is, the cross-sectional area of ​​the gas passage 300 will suddenly change at the narrowing portion 330 and suddenly decrease, thereby causing a change in acoustic impedance during sound propagation, thereby generating reflection and interference of sound waves, that is, the noise generated by the gas from the combustion barrel 140 can be transmitted through the combustion barrel 140 to the gas passage 300 and reflect and interfere at the narrowing portion 330, thereby effectively reducing the probability of the combustion barrel 140 generating noise when the gas is ejected from the micro-holes of the combustion barrel 140 at high speed and the probability of the combustion barrel 140 vibrating and resonating with other parts of the boiler to generate resonance noise, thereby effectively reducing the noise generated during the use of the heat exchanger and improving the user experience.

[0044] It is understandable that, in some embodiments, in addition to providing at least one narrowing portion 330 in the gas channel 300 to achieve the noise reduction effect, at least one expansion portion may also be provided in the gas channel 300. Since the cross-sectional area of ​​the expansion portion is larger than the cross-sectional area of ​​the gas channel 300, that is, the cross-sectional area of ​​the gas channel 300 will suddenly increase at the expansion portion, this structure can also cause a change in acoustic impedance during sound propagation, thereby generating reflection and interference of sound waves, that is, the noise generated at the combustion tube 140 can be transmitted to the gas channel and reflect, interfere, etc. at the expansion portion, thereby effectively reducing the noise generated during the use of the heat exchanger and improving the user experience.

[0045] It can be understood that in some embodiments, in addition to providing at least one narrowing portion 330 in the gas channel 300, or providing at least one expanding portion in the gas channel 300, at least one narrowing portion 330 and at least one expanding portion can also be provided in the gas channel 300 at the same time, the cross-sectional area of ​​the narrowing portion 330 is smaller than the cross-sectional area of ​​the gas channel 300, and the cross-sectional area of ​​the expanding portion is larger than the cross-sectional area of ​​the gas channel 300, thereby making the cross-sectional area of ​​the gas channel 300 suddenly decrease at the narrowing portion 330, and suddenly increase at the expanding portion, and the noise frequencies that can pass through the channels with different cross-sectional areas will also be different, thereby blocking and filtering noises of different frequencies, increasing the reflection and interference effect of the inner wall of the gas channel 300 on sound waves, and helping to improve the noise reduction effect.

[0046] Reference Figures 1 to 7In some embodiments, the air inlet passage 200 is disposed on the cover body 100 and extends outward relative to the cover body 100 , and the cross-sectional area of ​​the air inlet 310 is smaller than the cross-sectional area of ​​the air inlet passage 200 .

[0047] By adopting the above structure, a sudden reduction in the cross-sectional area of ​​the gas flow channel can be formed at the air inlet 310, so that the noise can also be reflected and interfered at the air inlet 310, thereby effectively reducing the noise.

[0048] Reference Figures 1 to 7 In some embodiments, the gas channel 300 has at least two narrowing portions 330 , and all the narrowing portions 330 are arranged at intervals.

[0049] By adopting the above structure, by providing at least two narrowing portions 330, and arranging the narrowing portions 330 at intervals, the cross-sectional area of ​​the gas channel 300 will suddenly decrease when the gas quickly flows into the narrowing portion 330, and the cross-sectional area of ​​the gas channel 300 will suddenly increase when the gas quickly flows out of the narrowing portion 330, thereby allowing the cross-sectional area of ​​the gas channel 300 to undergo multiple mutations, thereby enabling multiple reflections and interferences on the noise, and because the frequencies of noise that can pass through channels with different cross-sectional areas will also be different, noises of different frequencies can be blocked and filtered, thereby increasing the reflection and interference effects of the inner wall of the gas channel 300 on sound waves, which is beneficial to improving the noise reduction effect.

[0050] It can be understood that the number of the narrowing portion 330 is at least two, wherein the cross-sectional areas of any two narrowing portions 330 may be the same or different, and the present invention does not make any specific limitation on this.

[0051] Reference Figures 1 to 7 In some embodiments, the inner side wall of the gas channel 300 is provided with a first narrowing structure 400 corresponding to at least one group of narrowing portions 330, and the first narrowing structure 400 includes at least one first protrusion 410, which protrudes from the inner side wall of the gas channel 300 and forms the side wall of the narrowing portion 330.

[0052] In the above structure, by setting the first narrowing structure 400 on the inner side wall of the gas channel 300, the first narrowing structure 400 includes at least one first protrusion 410, and the first protrusion 410 is protrudingly set on the inner side wall of the gas channel 300, so that the cross-sectional area of ​​the gas channel 300 is suddenly reduced at the position where the first protrusion 410 is set, so that the narrowing portion 330 with a reduced cross-sectional area can be defined in the gas channel 300, and the first protrusion 410 forms the side wall of the narrowing portion 330, and the noise generated by the gas at the combustion tube 140 can be transmitted into the gas channel 300 and reflected and interfered at the first protrusion 410, thereby effectively reducing the noise generated at the combustion tube 140. In this structure, the provision of the first protrusion 410 can simplify the structure of the narrowing portion 330, making the processing of the narrowing portion 330 more convenient and quick.

[0053] It can be understood that the setting of the first protrusion 410 can also play a turbulent role, hinder the flow of gas, reduce the flow speed of gas, and then reduce the speed of gas when it is ejected from the combustion tube 140, which is beneficial to reduce the noise generated at the combustion tube 140. At the same time, this structure hinders the flow of gas and can also extend the flow time of gas in the gas channel 300, so that the gas and air can be fully mixed in the gas channel 300, so that the gas can burn more fully in the subsequent combustion process, thereby improving the combustion efficiency of the gas.

[0054] Reference Figures 1 to 7 In some embodiments, the first narrowing structure 400 includes two oppositely arranged first protrusions 410 , the two first protrusions 410 are correspondingly disposed on two opposite side walls of the gas channel 300 , and the narrowing portion 330 is located between the two corresponding first protrusions 410 .

[0055] By adopting the above structure, the narrowing portion 330 is confined between the two first protrusions 410, thereby effectively reducing the cross-sectional area of ​​the narrowing portion 330, and the side walls of the first protrusions 410 can form a reflective surface for reflecting noise, thereby improving the reflection and interference effects of noise, and further reducing the noise generated by the heat exchanger during use.

[0056] It is understandable that the first narrowing structure 400 includes two first protrusions 410, which is only for Figures 1 to 7 An exemplary description is given below. In addition, the narrowing portion 330 may also include one, three, four or more first protrusions 410, which is not specifically limited in the present invention.

[0057] Reference Figures 1 to 7In some embodiments, a guide plate 130 is provided in the cover body 100, and the gas channel 300 is formed by the guide plate 130 and the inner peripheral wall of the cover body 100. In the first narrowing structure 400, one of the first protrusions 410 is provided on the guide plate 130, and the other first protrusion 410 is provided on the peripheral wall of the cover body 100 and is arranged opposite to the guide plate 130.

[0058] In the above structure, the provision of the guide plate 130 can facilitate the formation of the gas channel 300 in the cover body 100 , and can facilitate the gas to flow from the gas inlet 310 of the gas channel 300 to the gas outlet 320 .

[0059] It is understandable that, referring to Figures 1 to 7 The guide plate 130 is arranged in an arc shape so that the gas channel 300 is arranged along the circumference of the cover body 100, and the entire gas channel 300 is arranged around the outer periphery of the gas outlet 320, thereby extending the flow path of the gas channel 300, so that the gas and air can be fully mixed in the gas channel 300, so that the gas can burn more fully in the subsequent combustion process, thereby improving the combustion efficiency of the gas.

[0060] Reference Figures 1 to 8 In some embodiments, the cover body 100 includes a cover body 110 and a sealing plate 120. The cover body 110 is provided with a gas chamber 111 and an opening connected to the gas chamber 111. The sealing plate 120 is installed on the cover body 110 and blocks the opening; the guide plate 130 is provided on the inner wall of the gas chamber 111 and abuts against the sealing plate 120. The gas channel 300 is formed by the cover body 110, the sealing plate 120 and the guide plate 130. The air inlet 310 and the air inlet channel 200 are both provided on the cover body 110. The air outlet 320 is provided on the sealing plate 120. The combustion tube 140 can be installed on the sealing plate 120 and connected to the air outlet 320.

[0061] By adopting the above structure, the cover body 100 is divided into the main body and the sealing plate 120, which can facilitate the installation of the cover body 100 and the setting of the gas channel 300. The guide plate 130 is set in the gas cavity 111 of the cover body 110. The sealing plate 120 is installed at the opening of the cover body 110 to define the gas channel 300. The structure is simple and easy to process.

[0062] It can be understood that the guide plate 130 is disposed on the inner wall of the combustion chamber 111. Figures 1 to 7 The guide plate 130 can be set as an integrally formed structure with the cover body 110, thereby facilitating the processing and manufacturing of the cover body 100 and also improving the structural strength of the cover body 100.

[0063] Reference Figures 1 to 8In some embodiments, the inner wall of the gas channel 300 is provided with a second narrowing structure corresponding to at least one group of narrowing portions 330, and the second narrowing structure includes at least one second protrusion 420, the second protrusion 420 is protrudingly arranged on the inner wall of the gas chamber 111 and abuts against the sealing plate 120, the second protrusion 420 and the guide plate 130 are arranged at intervals and define a narrowing portion 330; the second protrusion 420 is provided with a first mounting hole 421 for mounting the ignition needle 150, and the sealing plate 120 is provided with a second mounting hole 123 corresponding to the first mounting hole 421, and the ignition needle 150 can be inserted into the second mounting hole 123.

[0064] By adopting the above structure, the second protrusion 420 can be used as the mounting structure of the ignition needle 150, and the ignition needle 150 can be installed in the first mounting hole 421 and the second mounting hole 123 in sequence. In addition, the second protrusion 420 can also be arranged at intervals with the guide plate 130 to define a narrowing portion 330, so that the cross-sectional area of ​​the gas channel 300 can be suddenly reduced at the second protrusion 420, and then the noise can be reflected and interfered multiple times, which is beneficial to improving the noise reduction effect and further reducing the noise generated during the use of the heat exchanger.

[0065] It is understandable that, referring to Figures 1 to 8 In some embodiments, the second narrowing structure includes two second protrusions 420, which are arranged at intervals between two adjacent second protrusions 420. The narrowing portion 330 can be set between two adjacent second protrusions 420. At this time, it can not only further increase the number of narrowing portions 330 and improve the noise reduction effect, but also facilitate the separate installation of the two ignition needles 150.

[0066] It is understandable that the number of the second protrusions 420 in the second narrowing structure may be one, three, four or more than two, and the number may be selected according to the number of ignition needles 150 to be installed, which is not specifically limited in the present invention.

[0067] Reference Figures 1 to 8 In some embodiments, the sealing plate 120 is provided with at least one first reinforcing rib 121 , the first reinforcing rib 121 is protruded toward the gas passage 300 , and the at least one first reinforcing rib 121 is located in the narrowing portion 330 .

[0068] By adopting the above structure, the provision of the first reinforcing rib 121 can not only improve the structural strength of the sealing plate 120, but also, since the first reinforcing rib 121 is protruded toward the gas channel 300, and at least one first reinforcing rib 121 is located in the narrowing portion 330, the first reinforcing rib 121 located in the narrowing portion 330 protrudes toward the gas channel 300, which can further reduce the cross-sectional area of ​​the narrowing portion 330, so that the cross-sectional area of ​​the gas channel 300 at the narrowing portion 330 suddenly increases, thereby enhancing the interference and reflection effect on noise and improving the noise reduction effect.

[0069] Reference Figures 1 to 8 In some embodiments, a mounting portion 112 is protrudingly provided in the gas chamber 111 of the cover body 110, and the sealing plate 120 can abut against and be installed on the mounting portion 112, thereby facilitating the installation of the sealing plate 120 and the cover body 110. The sealing plate 120 and the mounting portion 112 can be connected by fasteners. Specifically, the mounting portion 112 is provided with a first fastening hole (not marked in the figure) for installing the fastener, and the sealing plate 120 is provided with a second fastening hole (not marked in the figure) for installing the fastener. During installation, the second fastener can be installed in the second fastening hole and the first fastening hole in sequence, wherein the fastener can specifically be a screw, a bolt, etc.

[0070] It is understandable that, referring to Figures 1 to 8 In some embodiments, in order to further improve the structural strength of the sealing plate 120, the sealing plate 120 is also provided with a second reinforcing rib 122 corresponding to the second fastening hole, and the second fastening hole is opened at the second reinforcing rib 122, thereby being able to improve the structure of the sealing plate 120 at the second fastening hole, so that the connection between the sealing plate 120 and the mounting portion 112 is more tight and stable, which is beneficial to improving the installation stability between the sealing plate 120 and the cover body 110.

[0071] Reference Fig. 9 and Fig.10 An embodiment of the present invention further provides a heat exchanger, which is provided with a cover assembly of any one of the above embodiments.

[0072] In the heat exchanger of the embodiment of the present invention, by adopting the cover assembly of any of the above-mentioned embodiments, at least one narrowing portion 330 and / or at least one expansion portion is set in the gas channel 300, so that the cross-sectional area of ​​the gas channel 300 can undergo a sudden change, thereby causing a change in acoustic impedance during sound propagation, so that the noise generated by the gas from the combustion barrel 140 can be transmitted through the combustion barrel 140 to the gas channel 300 and reflect, interfere, etc. at the narrowing portion 330 or the expansion portion, effectively reducing the probability of the combustion barrel 140 generating noise when the gas is ejected from the micropores of the combustion barrel 140 at high speed, and the probability of the combustion barrel 140 vibrating and resonating with other parts of the boiler to generate resonance noise, thereby effectively reducing the noise generated during the use of the heat exchanger and improving the user experience.

[0073] It is understandable that, referring to Fig. 9 and Fig.10 In some embodiments, the heat exchanger includes a shell 500, the shell 500 is provided with a heat exchange cavity 510, a heat exchange tube 520 is installed in the heat exchange cavity 510, a cover body 100 is covered on the shell 500, a combustion tube 140 is installed on the cover body 100 and is located in the heat exchange cavity 510, and combustion is performed through a plurality of micro-holes for gas to flow out. When in use, the gas enters the gas channel 300 from the air inlet channel 200, and then flows into the combustion tube 140 through the air outlet 320, and finally flows out from the micro-holes of the combustion tube 140. The cover body 100 is also provided with an ignition needle 150, and the ignition part of the ignition needle 150 is located on one side of the combustion tube 140, thereby igniting and burning the gas flowing out of the micro-holes of the combustion tube 140, thereby heating the heat exchange tube 520.

[0074] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A cover assembly, characterized in that: include: The cover body (100) is provided with an air intake channel (200) and a gas channel (300), and an air intake port (310) and an air outlet port (320) are correspondingly provided at two ends of the gas channel (300), the air intake port (310) is connected to the air intake channel (200), and the air outlet port (320) is used to be connected to the combustion cylinder (140); The gas channel (300) has at least one narrowing portion (330), the cross-sectional area of ​​the narrowing portion (330) is smaller than the cross-sectional area of ​​the gas channel (300), and / or the gas channel (300) has at least one expanding portion, the cross-sectional area of ​​the expanding portion is larger than the cross-sectional area of ​​the gas channel (300).

2. The cover assembly according to claim 1, characterized in that: The air inlet channel (200) is disposed on the cover body (100) and extends outward relative to the cover body (100); the cross-sectional area of ​​the air inlet (310) is smaller than the cross-sectional area of ​​the air inlet channel (200).

3. The cover assembly according to claim 1 or 2, characterized in that: The gas channel (300) has at least two sections of the narrowed portions (330), and all the narrowed portions (330) are arranged at intervals.

4. The cover assembly according to claim 3, characterized in that: The inner side wall of the gas channel (300) is provided with a first narrowing structure (400) corresponding to at least one group of the narrowing portions (330), and the first narrowing structure (400) includes at least one first protruding portion (410), and the first protruding portion (410) is protruding from the inner side wall of the gas channel (300) and forms a side wall of the narrowing portion (330).

5. The cover assembly according to claim 4, characterized in that: The first narrowing structure (400) comprises two first protrusions (410) arranged opposite to each other, the two first protrusions (410) being correspondingly arranged on two opposite side walls of the gas channel (300), and the narrowing portion (330) being located between the corresponding two first protrusions (410).

6. The cover assembly according to claim 5, characterized in that: A guide plate (130) is provided inside the cover body (100), and the gas channel (300) is formed by the guide plate (130) and the inner peripheral wall of the cover body (100) being mutually enclosed. In the first narrowing structure (400), one of the first protrusions (410) is provided on the guide plate (130), and the other first protrusion (410) is provided on the peripheral wall of the cover body (100) and is arranged opposite to the guide plate (130).

7. The cover assembly according to claim 6, characterized in that: The cover body (100) comprises a cover body (110) and a sealing plate (120); the cover body (110) is provided with a gas cavity (111) and an opening communicating with the gas cavity (111); the sealing plate (120) is installed on the cover body (110) and blocks the opening; The guide plate (130) is arranged on the inner wall of the gas chamber (111) and is in contact with the sealing plate (120); the gas channel (300) is formed by the cover body (110), the sealing plate (120) and the guide plate (130) being mutually enclosed and defined; the air inlet (310) and the air inlet channel (200) are both arranged on the cover body (110); the air outlet (320) is arranged on the sealing plate (120); the combustion tube (140) can be installed on the sealing plate (120) and communicate with the air outlet (320).

8. The cover assembly according to claim 7, characterized in that: The inner side wall of the gas channel (300) is provided with a second narrowing structure corresponding to at least one group of the narrowing portions (330), the second narrowing structure comprising at least one second protruding portion (420), the second protruding portion (420) being protrudingly arranged on the inner wall of the gas chamber (111) and abutting against the sealing plate (120), the second protruding portion (420) and the guide plate (130) being arranged at intervals and defining the narrowing portion (330); The second protrusion (420) is provided with a first mounting hole (421) for mounting the ignition needle (150), and the sealing plate (120) is provided with a second mounting hole (123) corresponding to the first mounting hole (421), and the ignition needle (150) can be inserted into the second mounting hole (123).

9. The cover assembly according to claim 7, characterized in that: The sealing plate (120) is provided with at least one first reinforcing rib (121), wherein the first reinforcing rib (121) is protruding toward the gas channel (300), and at least one first reinforcing rib (121) is located in the narrowed portion (330).

10. A heat exchanger, characterized in that A cover assembly according to any one of claims 1 to 9 is provided.

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