engine

Abstract

The application provides an engine, comprising a body provided with a containing cavity and an exhaust passage communicated with the containing cavity; a reed valve installed at an opening of the containing cavity; a gland installed on the body and blocking the opening of the containing cavity; and a fireproof member arranged in the containing cavity, wherein the fireproof member comprises a bottom plate and two side plates respectively arranged at opposite sides of the bottom plate, the two side plates are arranged at a side of the bottom plate facing the reed valve, and a plurality of through holes are formed in the bottom plate; wherein one end of the exhaust passage communicated with the containing cavity and the reed valve are respectively arranged at opposite sides of the bottom plate, a protruding portion is arranged on an outer side of at least one of the two side plates, and the maximum width of the fireproof member is greater than or equal to the width of the part of the containing cavity containing the fireproof member. When the high-temperature exhaust gas in the engine flows reversely in the exhaust passage, the mesh structure formed by the plurality of through holes in the bottom plate can cut and distribute the high-temperature exhaust gas, reduce the damage of the exhaust gas to the reed valve, and improve the service life of the reed valve.

Description

Technical Field

[0001] This application relates to the field of motorcycle engine technology, and in particular to an engine. Background Technology

[0002] Relevant regulations have strict requirements on motorcycle idling emissions. In order to reduce motorcycle emissions, a secondary air system is added to the motorcycle. The secondary air system supplies fresh air to the engine's exhaust passage, so that the exhaust gas is purified through secondary combustion.

[0003] Currently, the secondary air system includes an air filter and piping connecting the air filter to the engine. The engine has a receiving chamber containing a reed valve, which is connected to both the piping and the exhaust passage. During engine operation, the exhaust negative pressure controls the opening and closing of the reed valve, thereby controlling whether fresh air is supplied.

[0004] However, since the exhaust passage is bidirectional, there is a problem of high-temperature exhaust gas backflow. High-temperature exhaust gas backflow will burn out the reed valve, causing the reed valve to age and thus reduce or even lose its function. Utility Model Content

[0005] This application provides an engine that prevents the reed valve from being burned by high-temperature exhaust gas when it flows backward in the exhaust passage.

[0006] This application provides an engine, including:

[0007] The body is provided with a receiving cavity and an exhaust passage communicating with the receiving cavity;

[0008] A reed valve is installed at the opening of the receiving cavity and can be opened and closed under the action of gas pressure in the receiving cavity;

[0009] A pressure cap is installed on the machine body and seals the opening of the receiving cavity;

[0010] A flame-retardant component is disposed within the receiving cavity. The flame-retardant component includes a base plate and two side plates located on opposite sides of the base plate. The two side plates are located on the side of the base plate facing the reed valve. Multiple through holes are provided on the base plate.

[0011] The exhaust passage and the receiving cavity are connected at one end, and the reed valve is located on opposite sides of the bottom plate. At least one of the two side plates has a protruding part on its outer side. The maximum width of the flame-retardant component is greater than or equal to the width of the portion of the receiving cavity that contains the flame-retardant component.

[0012] In one embodiment, the protrusion is capable of elastic deformation under external force.

[0013] In one embodiment, protrusions are formed on the outer sides of the two opposing side plates. The protrusions are formed by the portion of the corresponding side plate protruding outward, and the side plates are provided with grooves corresponding to the inner sides of the protrusions.

[0014] In one embodiment, each of the two side plates is provided with a protrusion, and the number of protrusions on at least one side plate is multiple, with the multiple protrusions arranged at intervals along the length direction of the side plate.

[0015] In one embodiment, the reed valve includes a support plate and a reed. An air inlet is provided on the support plate, and one end of the reed is connected to the support plate to open or close the air inlet. A first sealing layer is provided on the outer edge of the support plate, and a second sealing layer is provided on the edge of the support plate at the air inlet.

[0016] The two side plates correspond to the portions of the support plate located between the first and second sealing layers.

[0017] In one embodiment, the receiving cavity includes two chambers, each of which is connected to an exhaust passage.

[0018] There are two flame-retardant components, which are respectively installed in two chambers.

[0019] The support plate has two air inlets, which correspond to two chambers respectively. Each air inlet is equipped with a spring.

[0020] In one embodiment, a limiting protrusion is provided inside the receiving cavity, the bottom plate supports and abuts against the limiting protrusion, and the top of the side plate abuts against the reed valve.

[0021] In one embodiment, the base plate has an extension that extends beyond the side plate, and the corners of the extension are provided with notches. The interior of the receiving cavity is provided with a positioning protrusion that extends into the notch.

[0022] In one embodiment, the through hole is a tapered hole, with the larger diameter end of the tapered hole facing the reed valve.

[0023] In one embodiment, the flame retardant includes at least two base plates, which are arranged at intervals along the height direction of the flame retardant, and the through holes on adjacent base plates are staggered.

[0024] The engine provided in this application embodiment features a flame-retardant component housed within the engine compartment. This flame-retardant component includes a base plate and two side plates located on opposite sides of the base plate, with the side plates facing the reed valve. Multiple through holes are formed on the base plate. Simultaneously, one end of the exhaust passage communicating with the compartment and the reed valve are located on opposite sides of the base plate. When high-temperature exhaust gas flows backward through the exhaust passage, the mesh structure formed by the multiple through holes on the base plate can cut and divert the high-temperature exhaust gas, reducing damage to the reed valve and extending its service life. By providing a protrusion on the outer side of at least one of the side plates, the maximum width of the flame-retardant component is greater than or equal to the width of the portion of the compartment containing the flame-retardant component. After the flame-retardant component is installed in the compartment, lateral movement is prevented, thus avoiding wear on the engine and the reed valve. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the engine structure in the relevant technology;

[0027] Figure 2 for Figure 1 The exploded view of the engine shown;

[0028] Figure 3 for Figure 1 A partial sectional view of the engine shown.

[0029] Figure 4 An exploded view of an engine provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure of a flame-retardant component provided in an embodiment of this application;

[0031] Figure 6 for Figure 4 A partial sectional view of the engine shown.

[0032] Figure 7 A top view of another flame-retardant component provided in an embodiment of this application;

[0033] Figure 8 for Figure 7 A schematic diagram showing the fit between the flame-retardant component and the machine body;

[0034] Figure 9This is a schematic diagram of the structure of the reed valve provided in the embodiments of this application;

[0035] Figure 10 for Figure 5 A schematic diagram showing the interaction between the flame-retardant component and the reed valve;

[0036] Figure 11 for Figure 5 A schematic diagram showing the fit between the flame-retardant component and the machine body;

[0037] Figure 12 for Figure 5 Top view of the flame-retardant component shown;

[0038] Figure 13 A partial cross-sectional view of another engine provided in an embodiment of this application;

[0039] Figure 14 This is a cross-sectional view of another flame-retardant component provided in an embodiment of this application.

[0040] Figure label:

[0041] 100. Body; 110. Receiving cavity; 111. Chamber; 112. Limiting protrusion; 113. Positioning protrusion; 120. Exhaust passage;

[0042] 200, reed valve; 210, support plate; 220, reed; 230, first sealing layer; 240, second sealing layer;

[0043] 300. Capping;

[0044] 400 Flame-retardant component; 410 Base plate; 411 Through hole; 412 Extension; 413 Notch; 420 Side plate; 421 Protrusion. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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.

[0047] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] Currently, secondary air systems include an air filter and piping connecting the air filter to the engine. For example... Figures 1-3 As shown, the engine has a receiving cavity 110, in which a reed valve 200 is installed. The receiving cavity 110 is connected to both a pipeline and an exhaust passage 120. During engine operation, the opening and closing of the reed valve 200 is controlled by the exhaust negative pressure, thereby controlling whether fresh air is supplied. However, since the exhaust passage 120 is bidirectional, there is a problem of high-temperature exhaust gas backflow. High-temperature exhaust gas backflow can burn out the reed valve 200, causing it to age, resulting in decreased or even complete loss of function.

[0050] To address the aforementioned problems, this application provides an engine with a flame-retardant component housed within the engine compartment. This flame-retardant component includes a base plate and two side plates located on opposite sides of the base plate, facing the reed valve. Multiple through holes are formed on the base plate. Simultaneously, one end of the exhaust passage communicating with the compartment and the reed valve are located on opposite sides of the base plate. When high-temperature exhaust gas flows backward through the exhaust passage, the mesh structure formed by the multiple through holes on the base plate can cut and divert the high-temperature exhaust gas, reducing damage to the reed valve and extending its service life. By providing a protrusion on the outer side of at least one of the side plates, the maximum width of the flame-retardant component is greater than or equal to the width of the portion of the compartment containing the flame-retardant component. After the flame-retardant component is installed in the compartment, lateral movement is prevented, thus avoiding wear on the engine and the reed valve.

[0051] The following will combine Figures 4 to 14 The specific structure of the engine provided in the embodiments of this application will be described.

[0052] Reference Figures 4 to 8 As shown, this application embodiment provides an engine, including a body 100, a reed valve 200, a pressure cap 300, and a flame-retardant component 400. The body 100 is provided with a receiving cavity 110 and an exhaust passage 120 communicating with the receiving cavity 110. Schematic, the engine body 100 includes a cylinder block and a cylinder head covering the cylinder block. The receiving cavity 110 and the exhaust passage 120 can be respectively disposed on the cylinder head. The top end of the exhaust passage 120 can communicate with the receiving cavity 110, and the exhaust gas generated during engine operation can be discharged through the receiving cavity 110 and the exhaust passage 120.

[0053] A reed valve 200 is installed in the opening of the receiving cavity 110 and can be opened and closed under the action of gas pressure in the receiving cavity 110. Exemplarily, the reed valve 200 forms an approximately plate-like structure whose shape matches the shape of the opening of the receiving cavity 110. In one possible implementation, a stepped portion is formed on the side wall of the receiving cavity 110 near the opening, which abuts against the side of the reed valve 200 facing the bottom wall of the receiving cavity 110. The stepped portion can limit the reed valve 200. Specifically, when a negative pressure is formed inside the receiving cavity 110, the negative pressure can open the reed valve 200; when a positive pressure or normal pressure is formed inside the receiving cavity 110, the reed valve 200 is closed. The opening of the reed valve 200 is controlled according to the gas pressure in the receiving cavity 110, thereby controlling whether fresh air is supplied to the receiving cavity 110 and the exhaust passage 120.

[0054] The gland 300 is installed on the engine body 100 and seals the opening of the receiving cavity 110. Optionally, the gland 300 can be fixed to the engine body 100 by fasteners. After the gland 300 is fixed to the engine body 100, the gland 300 abuts against the side of the reed valve 200 opposite to the bottom wall of the receiving cavity 110. The gland 300 has a cavity with an opening facing the reed valve 200. The gland 300 is provided with a connector, which can be connected to an air filter through a pipeline. During engine operation, air filtered by the air filter can enter the receiving cavity 110 of the engine body 100 through the pipeline, the cavity of the gland 300, and the reed valve 200, and then enter the exhaust passage 120 of the engine body 100 from the receiving cavity 110. The air filtered by the air filter allows for secondary combustion of the exhaust gas produced by the engine, reducing pollutant emissions during engine operation.

[0055] The flame-retardant component 400 is disposed within the receiving cavity 110. The flame-retardant component 400 includes a base plate 410 and two side plates 420 located on opposite sides of the base plate 410. The two side plates 420 are located on the side of the base plate 410 facing the reed valve 200. The base plate 410 has a plurality of through holes 411.

[0056] The extension direction of the side plate 420 can be inclined to or perpendicular to the extension direction of the base plate 410. For example, the base plate 410 and the two side plates 420 of the flame-retardant component 400 can be formed into a single piece using an integral molding process. The base plate 410 and the two side plates 420 form an approximate "U"-shaped structure, with the opening of the "U"-shaped structure facing the reed valve 200. Notably, the side of the side plate 420 away from the base plate 410 faces the reed valve 200. The side plate 420 creates a gap between the base plate 410 and the reed valve 200 in the depth direction of the receiving cavity 110. This gap prevents the base plate 410 of the flame-retardant component 400 from affecting the opening and closing of the reed valve 200. When the flame-retardant component 400 is disposed in the receiving cavity 110 of the body 100, the two side plates 420 of the flame-retardant component 400 are respectively positioned opposite the two side walls of the receiving cavity 110.

[0057] like Figures 4-8 As shown, multiple through holes 411 can be arranged in an array on the base plate 410, making the base plate 410 form a perforated plate structure. When airflow passes through the base plate 410 of the flame retardant component 400, the multiple through holes 411 on the base plate 410 can cut and divert the airflow. Those skilled in the art can set the number, size, and specific position of the through holes 411 as needed, and no unique limitation is made here.

[0058] The exhaust passage 120, which connects to the receiving cavity 110, and the reed valve 200 are located on opposite sides of the base plate 410. At least one of the two side plates 420 has a protrusion 421 protruding from its outer side, and the maximum width of the flame retardant 400 is greater than or equal to the width of the portion of the receiving cavity 110 that contains the flame retardant 400.

[0059] Understandably, when high-temperature exhaust gas flows to the reed valve 200 through the exhaust passage 120 and the receiving cavity 110, the high-temperature exhaust gas passes through the base plate 410 of the flame-retardant component 400 and is cut and diverted through multiple through holes 411 on the base plate 410. This can reduce the high-temperature exhaust gas from being concentrated and blown towards the reed valve 200, and reduce the damage to the reed valve 200 caused by the high-temperature exhaust gas.

[0060] It should be noted that the side of the two side plates 420 facing each other is the inner side of the side plate 420, and the side of the two side plates 420 facing away from each other is the outer side of the side plate 420. Protrusions 421 extending outward from the outer side of the side plate 420 can increase the width of the flame-retardant component 400. The shape of the protrusions 421 can be arc-shaped, rectangular, or other suitable shapes, and is not limited to a single shape.

[0061] like Figure 7 and Figure 8 As shown, the maximum width of the flame-retardant component 400 is W1, and the width of the portion of the receiving cavity 110 that houses the flame-retardant component 400 is Y, where W1 ≥ Y. The maximum width of the flame-retardant component 400 is the width of the flame-retardant component 400 at the protrusion 421. By providing the protrusion 421 on the side plate 420 to increase the width of the flame-retardant component 400, when the flame-retardant component 400 is placed in the receiving cavity 110, the protrusion 421 on the side plate 420 abuts against the side wall of the receiving cavity 110. The receiving cavity 110 can reliably limit the flame-retardant component 400, preventing it from moving left or right, thereby preventing wear on the engine and reed valve 200 caused by left or right movement of the flame-retardant component 400.

[0062] In one embodiment, the flame retardant 400 is interference-fitted with the receiving cavity 110.

[0063] The flame-retardant component 400 has a maximum width of W1, and the width of the portion of the receiving cavity 110 that houses the flame-retardant component 400 is Y, where W1 > Y. When the flame-retardant component 400 is placed in the receiving cavity 110, the sidewall of the receiving cavity 110 presses against the protrusion 421, causing the side plate 420 of the flame-retardant component 400 to undergo elastic deformation. This elastic deformation reliably fixes the flame-retardant component 400 within the receiving cavity 110. It is understood that a larger interference fit between the flame-retardant component 400 and the receiving cavity 110 results in greater friction between them. Those skilled in the art can adjust the interference fit between the flame-retardant component 400 and the receiving cavity 110 as needed to ensure that the receiving cavity 110 reliably limits the flame-retardant component 400 while ensuring its reliable installation within the cavity.

[0064] In this embodiment, the receiving cavity 110 can reliably restrict the left and right movement of the flame-retardant component 400. At the same time, the friction between the receiving cavity 110 and the flame-retardant component 400 can also restrict the front-back and up-down movement of the flame-retardant component 400, further preventing the flame-retardant component 400 from moving in the receiving cavity 110 and causing wear to the engine and reed valve 200.

[0065] In one embodiment, the protrusion 421 is capable of elastic deformation under the action of external force.

[0066] In one possible implementation, the protrusion 421 can be a component mounted on the side plate 420. The protrusion 421 can be made of an elastic material that can elastically deform when subjected to external force. The protrusion 421 can be fixed to the side plate 420 of the flame-retardant component 400 by means of adhesive or snap-fit ​​connection, etc., which is not the only limitation.

[0067] In this embodiment, when the flame-retardant component 400 is placed into the receiving cavity 110, the side wall of the receiving cavity 110 presses against the protrusion 421, causing the protrusion 421 to undergo elastic deformation. This elastic deformation allows the flame-retardant component 400 to be smoothly assembled. Furthermore, the elasticity of the protrusion 421 ensures that the flame-retardant component 400 is pressed tightly against the side wall of the receiving cavity 110. The receiving cavity 110 reliably restricts the lateral movement of the flame-retardant component 400, preventing it from moving within the receiving cavity 110 and causing wear to the engine and reed valve 200.

[0068] In one specific implementation, such as Figure 7 and Figure 8 As shown, protrusions 421 are formed on the outer sides of the two side plates 420 facing away from each other. The protrusions 421 are formed by the portion of the corresponding side plate 420 protruding outward. The side plate 420 is provided with a groove corresponding to the inner side of the protrusions 421.

[0069] The protrusion 421 can be formed on the side plate 420 by a suitable method such as integral molding or stamping. The shape of the protrusion 421 can be arc-shaped, and the opening of the groove on the side plate 420 faces the other side plate 420. When the protrusion 421 is squeezed, the protrusion 421 can undergo elastic deformation.

[0070] When the worker places the flame-retardant component 400 into the receiving cavity 110, the side wall of the receiving cavity 110 presses against the protrusion 421, causing the protrusion 421 to undergo elastic deformation. This deformation allows the flame-retardant component 400 to be placed into the receiving cavity 110. In other words, the shape of the protrusion 421 makes it easy to undergo elastic deformation, facilitating the placement of the flame-retardant component 400 into the receiving cavity 110. Furthermore, the protrusion 421 is formed on a portion of the side plate 420, eliminating the need for the step of installing the protrusion 421 onto the side plate 420, thus improving the production efficiency of the flame-retardant component 400.

[0071] In one embodiment, such as Figure 7 and Figure 8 As shown, each of the two side plates 420 has a protrusion 421. The number of protrusions 421 on at least one side plate 420 is multiple, and the multiple protrusions 421 are arranged at intervals along the length direction of the side plate 420.

[0072] In one possible implementation, one side plate 420 of the flame retardant 400 has a protrusion 421, and the other side plate 420 has multiple protrusions 421. In another possible implementation, both side plates 420 of the flame retardant 400 each have multiple protrusions 421. The protrusions 421 on the two side plates 420 can be arranged opposite each other or staggered, for example... Figure 7 and Figure 8 As shown, each side plate 420 may be provided with two protrusions 421, and the protrusions 421 on the two side plates 420 are arranged along the width direction of the flame retardant component 400.

[0073] In this embodiment, at least one side plate 420 of the flame retardant 400 abuts against the side wall of the receiving cavity 110 through multiple protrusions 421, so that at least one side of the flame retardant 400 has multiple support points with the side wall of the receiving cavity 110, thereby preventing the flame retardant 400 from rotating and shaking in the receiving cavity 110, and thus preventing the flame retardant 400 from rotating and shaking in the receiving cavity 110, which would cause wear on the engine and the reed valve 200.

[0074] In one embodiment, such as Figures 7-12As shown, the reed valve 200 includes a support plate 210 and a reed 220. The support plate 210 has an air inlet. One end of the reed 220 is connected to the support plate 210 to open or close the air inlet. The outer edge of the support plate 210 is provided with a first sealing layer 230, and the edge of the support plate 210 at the air inlet is provided with a second sealing layer 240.

[0075] The spring 220 and the support plate 210 can both be metal plates. The first end of the spring 220 can be fixed to the support plate 210 on the side facing the bottom wall of the receiving cavity 110 by fasteners. When a negative pressure is formed in the receiving cavity 110, the negative pressure can cause the second end of the spring 220 to move away from the support plate 210 to open the air inlet on the support plate 210. When a positive pressure or normal pressure is formed in the receiving cavity 110, the second end of the spring 220 abuts against the support plate 210 under its own elastic force to close the air inlet on the support plate 210. When the spring 220 opens the air inlet on the support plate 210, air filtered by the air filter can flow from the cavity of the pressure cap 300 into the receiving cavity 110.

[0076] It is worth mentioning that the distance between the two side plates 420 of the flame retardant component 400 on opposite sides is greater than the width of the spring 220, so as to avoid interference between the flame retardant component 400 and the spring 220 and ensure that the spring valve 200 can be reliably opened or closed.

[0077] Schematic illustration: Both the first sealing layer 230 and the second sealing layer 240 can be rubber layers, and the first sealing layer 230 and the second sealing layer 240 are provided on both opposite sides of the support plate 210. The first sealing layer 230 ensures the seal between the edge of the reed valve 200 and the side wall of the receiving cavity 110, and the second sealing layer 240 ensures the seal between the reed 220 and the support plate 210. The thickness of the first sealing layer 230 and the second sealing layer 240 can be set as needed, and is not limited to a single thickness here.

[0078] The two side plates 420 correspond to the portions of the support plate 210 located between the first sealing layer 230 and the second sealing layer 240.

[0079] For example, the distance between the inner edges of the first sealing layer 230 located on both sides of the spring 220 is X, and the distance between the opposite sides of the two side plates 420 can be equal to the value of X. The distance between the outer edges of the second sealing layer 240 located on both sides of the air inlet is less than the distance between the opposite sides of the two side plates 420.

[0080] The above settings prevent the flame retardant component 400 from damaging the first sealing layer 230 or the second sealing layer 240 of the reed valve 200, thus ensuring the service life of the reed valve 200.

[0081] In a specific embodiment, such as Figure 4 and Figures 8-11 As shown, the receiving cavity 110 includes two chambers 111, each of which is connected to an exhaust passage 120. The two chambers 111 are arranged side-by-side at the bottom of the receiving cavity 110. In one possible implementation, there can be two exhaust passages 120, each connected to one of the two chambers 111; in another possible implementation, the exhaust passage 120 can have two branches, each connected to one of the two chambers 111.

[0082] There are two flame-retardant components 400, each disposed within one of two chambers 111. Specifically, when a flame-retardant component 400 is placed in its corresponding chamber 111, the protrusion 421 on the side plate 420 of the flame-retardant component 400 abuts against the side wall of the corresponding chamber 111. The side wall of the chamber 111 can limit the flame-retardant component 400, preventing it from moving left or right.

[0083] The support plate 210 has two air inlets, which correspond to two chambers 111 respectively. A spring 220 is provided at the position of each air inlet.

[0084] Schematic illustration: the receiving cavity 110 also includes a mounting cavity located at the opening, which communicates with both chambers 111, and the reed valve 200 is mounted in the mounting cavity. Two air inlets on the support plate 210 are arranged side-by-side, and two reeds 220 are fixed side-by-side to the support plate 210. It can be understood that the two reeds 220 of the reed valve 200 can respectively control the communication state between the corresponding chamber 111 and the cavity of the gland 300.

[0085] In this embodiment, the two reeds 220 of the reed valve 200 can serve as backups for each other, preventing the reed valve 200 from malfunctioning due to the damage of a single reed 220. Flame-retardant components 400 are respectively provided in the two chambers 111 of the receiving cavity 110, so that the high-temperature exhaust gas flowing upward in the two chambers 111 is less likely to damage the reed valve 200.

[0086] In one embodiment, such as Figure 4 and Figure 6 As shown, the cavity 110 has a limiting protrusion 112 protruding inside, the bottom plate 410 supports and abuts against the limiting protrusion 112, and the top of the side plate 420 abuts against the reed valve 200.

[0087] Schematic illustration: the limiting protrusion 112 protrudes upward from the bottom wall of the receiving cavity 110, and the bottom surface of the base plate 410 abuts against the top of the limiting protrusion 112. The limiting protrusion 112 supports the flame-retardant component 400, allowing the base plate 410 of the flame-retardant component 400 to be positioned above the end connecting the exhaust passage 120 and the receiving cavity 110. Multiple limiting protrusions 112 are provided in the receiving cavity 110 to reliably support the flame-retardant component 400. The top of the side plate 420, i.e., the end of the side plate 420 away from the base plate 410, abuts against the reed valve 200, thereby limiting the flame-retardant component 400 and preventing it from detaching from the receiving cavity 110.

[0088] Indicatively, the height difference between the limiting protrusion 112 and the reed valve 200 matches the height of the flame-retardant component 400. Under the combined action of the limiting protrusion 112 and the reed valve 200, the flame-retardant component 400 is prevented from moving up and down in the receiving cavity 110, thereby preventing the flame-retardant component 400 from moving up and down and causing wear to the engine and the reed valve 200.

[0089] In one embodiment, such as Figure 5 , Figure 7 , Figure 8 , Figure 11 and Figure 12 As shown, the base plate 410 has an extension 412 that extends beyond the side plate 420. The corner of the extension 412 is provided with a notch 413. The interior of the receiving cavity 110 is provided with a positioning protrusion 113 that extends into the notch 413.

[0090] The extension 412 extending beyond the side plate 420 can be configured according to actual needs. The positioning protrusion 113 can protrude upwards from the bottom wall of the receiving cavity 110, and the shape and size of the notch 413 can match the positioning protrusion 113. In one possible implementation, when the receiving cavity 110 includes two chambers 111, both ends of the positioning protrusion 113 are located within the two chambers 111 respectively. When the flame-retardant component 400 is placed into the chamber 111, the portion of the positioning protrusion 113 located within the chamber 111 extends into the notch 413. Optionally, the bottom plate 410 has extensions 412 at both ends along its length.

[0091] The flame-retardant component 400 can be quickly positioned by the cooperation between the positioning protrusion 113 and the notch 413, making it easy for staff to quickly put the flame-retardant component 400 into the receiving cavity 110.

[0092] In one possible implementation, such as Figure 13 As shown, the through hole 411 is a tapered hole, with the large-diameter end of the tapered hole facing the reed valve 200.

[0093] The cross-sectional diameter of the tapered hole gradually decreases from the larger diameter end to the smaller diameter end. The larger diameter end and the smaller diameter end are the two opposite ends of the tapered hole, with the smaller diameter end facing the bottom wall of the receiving cavity 110. The taper of the tapered hole can be set as needed.

[0094] This structure sets the through hole 411 on the base plate 410 as a tapered hole, with the larger diameter end of the tapered hole facing the reed valve 200. This facilitates the passage of air filtered by the air filter through the tapered hole, thereby facilitating the mixing and secondary combustion of the air filtered by the air filter with the exhaust gas generated by the engine. When the high-temperature exhaust gas in the engine flows backward in the exhaust passage 120, the high-temperature exhaust gas is less likely to pass through the tapered hole along the direction from the smaller diameter end to the larger diameter end, improving the protective effect of the flame-retardant component 400 on the reed valve 200 and further extending the service life of the reed valve 200.

[0095] In one possible implementation, such as Figure 14 As shown, the flame retardant component 400 includes at least two base plates 410, which are arranged at intervals along the height direction of the flame retardant component 400, and the through holes 411 on the two adjacent base plates 410 are staggered.

[0096] For example, the multiple base plates 410 of the flame retardant component 400 are arranged parallel to each other at intervals. For example, the flame retardant component 400 may be provided with two base plates 410, and each base plate 410 is connected to two side plates 420 on both sides respectively. Optionally, the two side plates 420 and the multiple base plates 410 of the flame retardant component 400 can be formed into a single piece by an integral molding process. Specifically, the projection of the through hole 411 on any base plate 410 along the height direction of the flame retardant component 400 does not coincide with the projection of the through hole 411 on the adjacent base plate 410 along the height direction of the flame retardant component 400.

[0097] With this structure, when the high-temperature exhaust gas in the engine flows backward in the exhaust passage 120, the high-temperature exhaust gas needs to pass through multiple through holes 411 on the base plate 410 before flowing to the reed valve 200. The through holes 411 on the multiple base plates 410 can further cut and divert the high-temperature exhaust gas, further reduce the damage of the exhaust gas to the reed valve 200, and improve the service life of the reed valve 200.

[0098] 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.

[0099] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An engine, characterized in that, include: The body is provided with a receiving cavity and an exhaust passage communicating with the receiving cavity; A reed valve is installed at the opening of the receiving cavity and can be opened and closed under the action of gas pressure in the receiving cavity; A pressure cap is installed on the body and seals the opening of the receiving cavity; A flame-retardant component is disposed within the receiving cavity. The flame-retardant component includes a base plate and two side plates located on opposite sides of the base plate. The two side plates are located on the side of the base plate facing the reed valve. The base plate has multiple through holes. The exhaust passage and the receiving cavity are connected at one end, and the reed valve is located on opposite sides of the base plate. At least one of the two side plates has a protruding part on its outer side. The maximum width of the flame retardant is greater than or equal to the width of the portion of the receiving cavity that contains the flame retardant.

2. The engine according to claim 1, characterized in that, The protrusion can undergo elastic deformation under the action of external force.

3. The engine according to claim 2, characterized in that, The two opposite sides of the side plates each have a protruding portion, which is formed by the portion of the side plate protruding outward. The side plate is provided with a groove corresponding to the inner side of the protruding portion.

4. The engine according to any one of claims 1-3, characterized in that, The two side plates are respectively provided with the protrusions, and the number of protrusions on at least one side plate is multiple, and the multiple protrusions are arranged at intervals along the length direction of the side plate.

5. The engine according to claim 1, characterized in that, The reed valve includes a support plate and a reed. An air inlet is provided on the support plate. One end of the reed is connected to the support plate to open or close the air inlet. A first sealing layer is provided on the outer edge of the support plate, and a second sealing layer is provided on the edge of the support plate located at the air inlet. The two side plates correspond to the portions of the support plate located between the first sealing layer and the second sealing layer.

6. The engine according to claim 5, characterized in that, The receiving cavity includes two chambers, and the two chambers are respectively connected to the exhaust passage; The number of flame-retardant components is two, and the two flame-retardant components are respectively disposed in the two chambers; The support plate has two air inlets, which correspond to the two chambers respectively, and a spring is provided at the position of each air inlet.

7. The engine according to claim 1, characterized in that, The cavity is provided with a limiting protrusion, the base plate supports and abuts against the limiting protrusion, and the top of the side plate abuts against the reed valve.

8. The engine according to claim 1, characterized in that, The base plate has an extension that extends beyond the side plate, and the corners of the extension are provided with notches. The interior of the receiving cavity is provided with a positioning protrusion that extends into the notch.

9. The engine according to claim 1, characterized in that, The through hole is a tapered hole, with the larger diameter end of the tapered hole facing the reed valve.

10. The engine according to claim 1, characterized in that, The flame-retardant component includes at least two base plates, which are arranged at intervals along the height direction of the flame-retardant component, and the through holes on adjacent base plates are staggered.

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