Engine

Abstract

The invention provides an engine which comprises an engine body provided with a containing cavity and an exhaust passage communicating with the containing cavity. The reed valve is mounted at the opening of the accommodating cavity; the gland is mounted on the machine body and blocks the opening of the accommodating cavity; the flame-retardant part is arranged in the containing cavity, the flame-retardant part comprises a bottom plate and two side plates located on the two opposite sides of the bottom plate respectively, the two side plates are located on the side, facing the reed valve, of the bottom plate, and a plurality of through holes are formed in the bottom plate; wherein the end, communicated with the containing cavity, of the exhaust passage and the reed valve are located on the two opposite sides of the bottom plate respectively, a protruding part is arranged on the outer side of at least one of the two side plates in a protruding mode, and the maximum width of the flame-retardant part is larger than or equal to the width of the part, containing the flame-retardant part, of the containing cavity. When high-temperature waste gas in an engine flows reversely in the exhaust passage, the mesh structure formed by the through holes in the bottom plate can cut and divide the high-temperature waste gas, damage of the waste gas to the reed valve is reduced, and the service life of the reed valve is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the motorcycle engine technical field, and particularly relates to an engine. BACKGROUND

[0002] The relevant regulations have strict requirements on the motorcycle idle emission. In order to reduce the motorcycle emission, a secondary air system is added to the motorcycle, and fresh air is supplemented to the exhaust passage of the engine through the secondary air system, so that the exhaust gas is purified by secondary combustion.

[0003] At present, the secondary air system comprises an air filter and a pipeline connecting the air filter and the engine. The engine is provided with a containing cavity, and a reed valve is installed in the containing cavity. The containing cavity is in communication with the pipeline and the exhaust passage respectively. During the operation of the engine, the opening and closing of the reed valve are controlled by the exhaust negative pressure, so as to control whether the fresh air is supplemented.

[0004] However, since the exhaust passage is bidirectional, the problem of high-temperature exhaust gas backflow exists. The high-temperature exhaust gas backflow can burn the reed valve, so that the reed valve is aged and the function is reduced or even lost. SUMMARY

[0005] The engine provided by the embodiment of the present application can avoid the high-temperature exhaust gas from burning the reed valve when the high-temperature exhaust gas backflows in the exhaust passage.

[0006] The engine provided by the embodiment of the present application comprises:

[0007] a body provided with a containing cavity and an exhaust passage in communication with the containing cavity;

[0008] a reed valve installed at an opening of the containing cavity and capable of being opened and closed under the action of gas pressure in the containing cavity;

[0009] a gland installed on the body and blocking the opening of the containing cavity;

[0010] a fire-retardant member arranged in the containing cavity, the fire-retardant member comprising a bottom plate and two side plates respectively located at opposite sides of the bottom plate, the two side plates being located at a side of the bottom plate facing the reed valve, and a plurality of through holes being formed in the bottom plate;

[0011] wherein one end of the exhaust passage in communication with the containing cavity and the reed valve are respectively located at opposite sides of the bottom plate, the outer side of at least one of the two side plates is provided with a protruding portion, and the maximum width of the fire-retardant member is greater than or equal to the width of the part of the containing cavity containing the fire-retardant member.

[0012] In one of the embodiments, the protruding portion can be elastically deformed under the action of an external force.

[0013] In one embodiment, the outer sides of the two side panels facing each other are protruded to form protrusions, which are formed by the outward protrusions of the corresponding side panels, and the side panels are provided with grooves corresponding to the inner sides of the protrusions.

[0014] In one embodiment, the two side panels are respectively provided with protrusions, and at least one side panel has a plurality of protrusions, which are spaced apart along the length direction of the side panel.

[0015] In one embodiment, the reed valve includes a support plate and a reed, wherein the support plate is provided with an air inlet, 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 an outer edge of the support plate, and a second sealing layer is provided on an edge of the support plate located at the air inlet;

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

[0017] In one embodiment, the accommodating chamber includes two chambers, and the two chambers are respectively connected to the exhaust passage;

[0018] There are two flame retardants, which are respectively arranged in two chambers;

[0019] The support plate is provided with two air inlets, which correspond to the two chambers respectively, and a reed is provided at the position of each air inlet.

[0020] In one embodiment, a limiting protrusion is protruded from the interior of the accommodating cavity, the bottom plate supports and abuts against the limiting protrusion, and the top end of the side plate abuts against the reed valve.

[0021] In one embodiment, the bottom plate has an extension portion extending beyond the side plate, and the corners of the extension portion are provided with notches. A positioning protrusion is provided inside the accommodating cavity, and the positioning protrusion extends into the notch.

[0022] In one embodiment, the through hole is a tapered hole, and the large diameter end of the tapered hole faces the reed valve.

[0023] In one embodiment, the flame retardant component includes at least two bottom plates, the two bottom plates are spaced apart along the height direction of the flame retardant component, and the through holes on the two adjacent bottom plates are staggered.

[0024] The engine provided by the embodiment of the present application is provided with a fireproof member in the accommodating cavity of the engine body, the fireproof member comprises a bottom plate and two side plates respectively located on the opposite sides of the bottom plate, the two side plates are located on the side of the bottom plate facing the reed valve, and a plurality of through holes are formed in the bottom plate. Meanwhile, one end of the exhaust passage and the reed valve communicating with the accommodating cavity are respectively located on the opposite sides of the bottom plate. 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, so as to reduce the damage of the exhaust gas to the reed valve and improve the service life of the reed valve. The protruding part is protruded outward from at least one of the two side plates, so that the maximum width of the fireproof member is greater than or equal to the width of the part of the accommodating cavity accommodating the fireproof member. After the fireproof member is installed in the accommodating cavity, the left and right movement of the fireproof member can be avoided, and the wear of the fireproof member to the engine and the reed valve can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments or the exemplary embodiments of the present application, the drawings needed to be used in the description of the embodiments or the exemplary embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] Figure 1 FIG. 1 is a structural schematic diagram of an engine in the related art;

[0027] Figure 2 FIG. 2 is an exploded view of the engine shown in FIG. 1; Figure 1

[0028] Figure 3 FIG. 4 is a partial cross-sectional view of the engine shown in FIG. 1; Figure 1

[0029] Figure 4 FIG. 6 is an exploded view of an engine provided by an embodiment of the present application;

[0030] Figure 5 FIG. 7 is a structural schematic diagram of a fireproof member provided by an embodiment of the present application;

[0031] Figure 6 FIG. 8 is a partial cross-sectional view of the engine shown in FIG. 7; Figure 4

[0032] Figure 7 FIG. 10 is a top view of another fireproof member provided by an embodiment of the present application;

[0033] Figure 8 FIG. 11 is a schematic diagram of the fireproof member and the engine body shown in FIG. 10; Figure 7

[0034] Figure 9 ​​​​A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure.

[0035] Figure 10 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure. Figure 5 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure.

[0036] Figure 11 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure. Figure 5 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure.

[0037] Figure 12 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure. Figure 5 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure.

[0038] Figure 13 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure.

[0039] Figure 14 A structure schematic diagram of a reed valve provided by an embodiment of the present application is shown in the figure.

[0040] Reference signs:

[0041] 100, cylinder; 110, accommodating 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, gland;

[0044] 400, reed; 410, bottom plate; 411, through hole; 412, extension; 413, notch; 420, side plate; 421, protrusion. DETAILED DESCRIPTION

[0045] In order to make the above objectives, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0046] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0047] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is 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 "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present application are only for the purpose of illustration, and do not represent the only implementation.

[0049] At present, the secondary air system includes an air filter and a pipeline connecting the air filter and the engine. As shown in Figures 1-3 The engine is provided with a containing cavity 110, a reed valve 200 is installed in the containing cavity 110, and the containing cavity 110 is in communication with the pipeline and an exhaust passage 120 respectively. During the operation of the engine, the opening and closing of the reed valve 200 is controlled by the exhaust negative pressure, so as to control whether to supplement fresh air. However, since the exhaust passage 120 is bidirectional, there is a problem of reverse flow of high-temperature exhaust gas, and the reverse flow of high-temperature exhaust gas can burn the reed valve 200, so that the reed valve 200 ages and its function decreases or even loses.

[0050] To solve the above problems, the engine provided by the embodiment of the present application is provided with a fireproof member in the accommodating cavity of the engine body, the fireproof member comprises a bottom plate and two side plates respectively located on the opposite sides of the bottom plate, the two side plates are located on the side of the bottom plate facing the reed valve, and a plurality of through holes are formed in the bottom plate. Meanwhile, one end of the exhaust passage communicated with the accommodating cavity and the reed valve are respectively located on the opposite sides of the bottom plate. 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. The protruding part is protruded outward from at least one of the two side plates, so that the maximum width of the fireproof member is greater than or equal to the width of the part of the accommodating cavity accommodating the fireproof member. After the fireproof member is installed in the accommodating cavity, the left and right movement of the fireproof member can be avoided, and the wear of the fireproof member to the engine and the reed valve can be avoided.

[0051] The specific structure of the engine provided by the embodiment of the present application will be described below. Figures 4 to 14 The specific structure of the engine provided by the embodiment of the present application will be described below.

[0052] Referring to FIG. 1, Figures 4 to 8 The engine provided by the embodiment of the present application comprises an engine body 100, a reed valve 200, a gland 300 and a fireproof member 400. The engine body 100 is provided with an accommodating cavity 110 and an exhaust passage 120 communicated with the accommodating cavity 110. Illustratively, the engine body 100 of the engine comprises a cylinder body and a cylinder head covering the cylinder body, the accommodating cavity 110 and the exhaust passage 120 can be arranged on the cylinder head, the top end of the exhaust passage 120 can be communicated with the accommodating cavity 110, and the exhaust gas generated during the operation of the engine can be discharged through the accommodating cavity 110 and the exhaust passage 120.

[0053] The reed valve 200 is installed at the opening of the accommodating cavity 110 and can be opened and closed under the action of the gas pressure in the accommodating cavity 110. Illustratively, the reed valve 200 forms an approximate sheet structure, and the shape of the sheet structure matches the shape of the opening of the accommodating cavity 110. In a possible implementation, a step part is formed on the side wall of the accommodating cavity 110 close to the opening, and the step part can abut against the side of the reed valve 200 facing the bottom wall of the accommodating cavity 110. The reed valve 200 can be limited by the step part. When a negative pressure is formed in the accommodating cavity 110, the negative pressure can open the reed valve 200; when a positive pressure or a normal pressure is formed in the accommodating cavity 110, the reed valve 200 is closed. The opening of the reed valve 200 is controlled according to the gas pressure in the accommodating cavity 110, so as to control whether to supplement fresh air into the accommodating cavity 110 and the exhaust passage 120.

[0054] The gland 300 is mounted on the engine body 100 and blocks the opening of the accommodating chamber 110. Optionally, the gland 300 can be secured to the engine body 100 by fastening with fasteners. When the gland 300 is secured to the engine body 100, the gland 300 abuts against the side of the bottom wall of the reed valve 200 facing away from the accommodating chamber 110. The gland 300 has a cavity opening toward the reed valve 200. The gland 300 is provided with a connector that can be connected to the air filter via a pipeline. During engine operation, air filtered by the air filter can enter the accommodating chamber 110 of the engine body 100 via 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 accommodating chamber 110. The air filtered by the air filter can cause secondary combustion of exhaust gas generated by the engine, thereby reducing pollutant emissions during engine operation.

[0055] The flame retardant 400 is disposed in the accommodating cavity 110 and includes a bottom plate 410 and two side plates 420 located on opposite sides of the bottom plate 410. The two side plates 420 are located on the side of the bottom plate 410 facing the reed valve 200. The bottom plate 410 is provided with a plurality of through holes 411.

[0056] The side panels 420 can extend in a direction that is oblique to or perpendicular to the direction of extension of the bottom panel 410. For example, the bottom panel 410 and the two side panels 420 of the flame retardant 400 can be formed as a single piece through an integrated molding process. The bottom panel 410 and the two side panels 420 form a roughly "U"-shaped structure, with the opening of the "U"-shaped structure facing the reed valve 200. It is worth noting that the side of the side panel 420 facing away from the bottom panel 410 faces the reed valve 200. The side panels 420 create a gap between the bottom panel 410 and the reed valve 200 in the depth direction of the accommodating chamber 110. This gap prevents the bottom panel 410 of the flame retardant 400 from interfering with the opening and closing of the reed valve 200. When the flame retardant 400 is disposed in the accommodating chamber 110 of the housing 100, the two side panels 420 of the flame retardant 400 face opposite side walls of the accommodating chamber 110.

[0057] like Figures 4-8 As shown, multiple through holes 411 can be arranged in an array on the bottom plate 410, so that the bottom plate 410 forms a mesh plate structure. When air flows through the bottom plate 410 of the flame retardant 400, the multiple through holes 411 on the bottom plate 410 can cut and divert the airflow. Those skilled in the art can adjust the number, size, and specific location of the through holes 411 as needed, and this is not a limitation here.

[0058] The one end of the exhaust passage 120 communicated with the accommodating cavity 110 and the reed valve 200 are respectively located at opposite sides of the bottom plate 410. The outer side of at least one of the two side plates 420 is provided with a protruding portion 421, and the maximum width of the fireproof piece 400 is greater than or equal to the width of the part of the accommodating cavity 110 accommodating the fireproof piece 400.

[0059] It can be understood that when the high-temperature exhaust gas flows to the reed valve 200 through the exhaust passage 120 and the accommodating cavity 110, the high-temperature exhaust gas is cut and divided through the bottom plate 410 of the fireproof piece 400, and the high-temperature exhaust gas is cut and divided through the plurality of through holes 411 on the bottom plate 410, which can reduce the concentration of the high-temperature exhaust gas blowing to the reed valve 200 and reduce the damage of the high-temperature exhaust gas to the reed valve 200.

[0060] It should be noted that the opposite side of the two side plates 420 is the inner side of the side plate 420, and the opposite side of the two side plates 420 is the outer side of the side plate 420. The protruding portion 421 protruding from the outer side surface of the side plate 420 can increase the width of the fireproof piece 400. The shape of the protruding portion 421 can be arc-shaped or rectangular, and the like, which is not limited herein.

[0061] As shown in Figure 7 and Figure 8 , the maximum width of the fireproof piece 400 is W1, the width of the part of the accommodating cavity 110 accommodating the fireproof piece 400 is Y, and W1≥Y. The maximum width of the fireproof piece 400 is the width of the fireproof piece 400 at the position of the protruding portion 421. By providing the protruding portion 421 on the side plate 420 to increase the width of the fireproof piece 400, when the fireproof piece 400 is arranged in the accommodating cavity 110, the protruding portion 421 on the side plate 420 abuts against the side wall of the accommodating cavity 110, and the accommodating cavity 110 can reliably limit the fireproof piece 400, avoiding the left and right movement of the fireproof piece 400, and further avoiding the abrasion of the left and right movement of the fireproof piece 400 to the engine and the reed valve 200.

[0062] In one embodiment, the fireproof piece 400 is in interference fit with the accommodating cavity 110.

[0063] The maximum width of the fire-retardant member 400 is W1, the width of the portion of the accommodating cavity 110 accommodating the fire-retardant member 400 is Y, and W1>Y. When the fire-retardant member 400 is placed in the accommodating cavity 110, the side wall of the accommodating cavity 110 extrudes the protruding portion 421 so that the side plate 420 of the fire-retardant member 400 is elastically deformed. The elastic deformation of the fire-retardant member 400 enables the fire-retardant member 400 to be reliably fixed in the accommodating cavity 110. It can be understood that the greater the interference between the fire-retardant member 400 and the accommodating cavity 110, the greater the friction between the fire-retardant member 400 and the side wall of the accommodating cavity 110. A person skilled in the art can set the interference between the fire-retardant member 400 and the accommodating cavity 110 according to the needs, to ensure that the accommodating cavity 110 can reliably limit the fire-retardant member 400, and at the same time, ensure that the fire-retardant member 400 can be reliably installed in the accommodating cavity 110.

[0064] In the embodiment, the accommodating cavity 110 can reliably limit the left-right movement of the fire-retardant member 400, and at the same time, the friction between the accommodating cavity 110 and the fire-retardant member 400 can also limit the front-back and up-down movement of the fire-retardant member 400, further avoiding the movement of the fire-retardant member 400 in the accommodating cavity 110 to cause wear of the engine and the reed valve 200.

[0065] In one embodiment, the protruding portion 421 can be elastically deformed under the action of an external force.

[0066] In a possible implementation, the protruding portion 421 can be a component installed on the side plate 420, and the protruding portion 421 can be made of an elastic material and can be elastically deformed when receiving an external force. The protruding portion 421 can be fixed to the side plate 420 of the fire-retardant member 400 by bonding or clamping connection, which is not limited herein.

[0067] In the embodiment, when the fire-retardant member 400 is placed in the accommodating cavity 110, the side wall of the accommodating cavity 110 extrudes the protruding portion 421 so that the protruding portion 421 is elastically deformed, and the elastic deformation of the protruding portion 421 enables the fire-retardant member 400 to be smoothly assembled. In addition, the elastic force of the protruding portion 421 can make the fire-retardant member 400 and the side wall of the accommodating cavity 110 tightly pressed, the accommodating cavity 110 can reliably limit the left-right movement of the fire-retardant member 400, and avoid the movement of the fire-retardant member 400 in the accommodating cavity 110 to cause wear of the engine and the reed valve 200.

[0068] In a specific embodiment, as shown in Figure 7 and Figure 8 the outer sides of the two side plates 420 opposite to each other protrude to form the protruding portions 421, the protruding portions 421 are formed by the portions of the corresponding side plates 420 protruding outward, and the side plates 420 are provided with grooves corresponding to the inner sides of the protruding portions 421.

[0069] The protruding portion 421 can be formed on the side plate 420 by integral molding or stamping, and the protruding portion 421 can be arc-shaped. The opening of the groove on the side plate 420 faces the other side plate 420. When the protruding portion 421 is pressed, the protruding portion 421 can be elastically deformed.

[0070] When the staff member puts the fire-retardant member 400 into the accommodating cavity 110, the side wall of the accommodating cavity 110 presses the protruding portion 421 so that the protruding portion 421 is elastically deformed. The deformation of the protruding portion 421 allows the fire-retardant member 400 to be put into the accommodating cavity 110. That is, the shape of the protruding portion 421 allows the protruding portion 421 to be elastically deformed easily, which facilitates the staff member to put the fire-retardant member 400 into the accommodating cavity 110. In addition, the protruding portion 421 is formed on the side plate 420, which saves the process of mounting the protruding portion 421 on the side plate 420, and is beneficial to improving the production efficiency of the fire-retardant member 400.

[0071] In one embodiment, as shown in Figure 7 and Figure 8 , the two side plates 420 are respectively provided with the protruding portion 421. The number of the protruding portion 421 on at least one side plate 420 is multiple, and the multiple protruding portions 421 are arranged along the length direction of the side plate 420.

[0072] In one possible implementation, one protruding portion 421 is arranged on one side plate 420 of the fire-retardant member 400, and multiple protruding portions 421 are arranged on the other side plate 420. In another possible implementation, multiple protruding portions 421 are arranged on each of the two side plates 420 of the fire-retardant member 400. The protruding portions 421 on the two side plates 420 can be arranged in parallel or staggered, for example, as shown in Figure 7 and Figure 8 , two protruding portions 421 can be arranged on each side plate 420, and the protruding portions 421 on the two side plates 420 are arranged in parallel along the width direction of the fire-retardant member 400.

[0073] In the embodiment, at least one side plate 420 of the fire-retardant member 400 is in contact with the side wall of the accommodating cavity 110 through the multiple protruding portions 421, so that multiple supporting points are formed between at least one side of the fire-retardant member 400 and the side wall of the accommodating cavity 110. This avoids the rotation and shaking of the fire-retardant member 400 in the accommodating cavity 110, and further avoids the wear of the engine and the reed valve 200 caused by the rotation and shaking of the fire-retardant member 400 in the accommodating cavity 110.

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

[0075] The reed 220 and support plate 210 can each be metal plates. The first end of the reed 220 is secured to the side of the support plate 210 facing the bottom wall of the accommodating chamber 110 via fasteners. When negative pressure forms in the accommodating chamber 110, this negative pressure causes the second end of the reed 220 to move away from the support plate 210, thereby opening the air inlet on the support plate 210. When positive pressure or normal pressure forms in the accommodating chamber 110, the second end of the reed 220, under its own elastic force, presses against the support plate 210, thereby closing the air inlet on the support plate 210. When the reed 220 opens the air inlet on the support plate 210, air filtered by the air filter can flow from the cavity of the gland 300 into the accommodating chamber 110.

[0076] It is worth mentioning that the distance between the two side plates 420 of the flame retardant 400 on opposite sides is greater than the width of the reed 220, avoiding interference between the flame retardant 400 and the reed 220, ensuring that the reed valve 200 can be opened or closed reliably.

[0077] Illustratively, the first sealing layer 230 and the second sealing layer 240 may both be rubber layers, and are disposed on opposite sides of the support plate 210. The first sealing layer 230 ensures sealing between the edge of the reed valve 200 and the sidewalls of the accommodating cavity 110, while the second sealing layer 240 ensures sealing between the reed 220 and the support plate 210. The thickness of each of the first sealing layer 230 and the second sealing layer 240 can be adjusted as needed and is not a single limitation herein.

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

[0079] For example, the distance between the inner edge of the first sealing layer 230 on both sides of the reed 220 is X, and the distance between the two side panels 420 on opposite sides can be equal to X. The distance between the outer edge of the second sealing layer 240 on both sides of the air inlet is smaller than the distance between the two side panels 420 on opposite sides.

[0080] Through the above arrangement, the flame retardant 400 is prevented from damaging the first sealing layer 230 or the second sealing layer 240 of the reed valve 200 , thereby ensuring the service life of the reed valve 200 .

[0081] In a specific embodiment,Figure 4 and Figures 8-11 As shown, the accommodating chamber 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 accommodating chamber 110. In one possible implementation, there may be two exhaust passages 120, each of which is connected to the two chambers 111. In another possible implementation, the exhaust passage 120 may have two branches, each of which is connected to the two chambers 111.

[0082] There are two flame retardants 400, each placed in one of the two chambers 111. Specifically, when a flame retardant 400 is placed in its corresponding chamber 111, the protrusions 421 on the side panels 420 of the flame retardant 400 abut against the sidewalls of the corresponding chamber 111. The sidewalls of the chamber 111 limit the position of the flame retardant 400, preventing it from moving left or right.

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

[0084] Schematically, the accommodating chamber 110 also includes an installation cavity at the open position, which is connected to the two chambers 111. The reed valve 200 is installed in the installation cavity. The 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 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 backup for each other, preventing damage to a single reed 220 that could cause the reed valve 200 to malfunction. Flame retardants 400 are provided in each of the two chambers 111 of the accommodating cavity 110, preventing the high-temperature exhaust gas flowing upward from either chamber 111 from damaging the reed valve 200.

[0086] In one embodiment, Figure 4 and Figure 6 As shown, a limiting protrusion 112 is protruded from the interior of the accommodating cavity 110 , the bottom plate 410 supports and abuts against the limiting protrusion 112 , and the top end of the side plate 420 abuts against the reed valve 200 .

[0087] Illustratively, the limiting protrusion 112 is upwardly protruded from the bottom wall of the accommodating cavity 110, and the bottom surface of the bottom plate 410 abuts against the top end of the limiting protrusion 112. By supporting the fire-retardant member 400 through the limiting protrusion 112, the bottom plate 410 of the fire-retardant member 400 can be located above the exhaust passage 120 at the end connected to the accommodating cavity 110. In this case, a plurality of limiting protrusions 112 are arranged in the accommodating cavity 110, and the fire-retardant member 400 is reliably supported by the plurality of limiting protrusions 112. The top end of the side plate 420, i.e., the end of the side plate 420 away from the bottom plate 410, abuts against the reed valve 200, and thus the reed valve 200 can limit the fire-retardant member 400 from being pulled out of the accommodating cavity 110.

[0088] Illustratively, the height difference between the limiting protrusion 112 and the reed valve 200 matches the height of the fire-retardant member 400, and under the joint action of the limiting protrusion 112 and the reed valve 200, the fire-retardant member 400 is prevented from moving up and down in the accommodating cavity 110, thereby avoiding the fire-retardant member 400 from moving up and down and causing wear to the engine and the reed valve 200.

[0089] In one embodiment, as shown in Figure 5 , Figure 7 , Figure 8 , Figure 11 and Figure 12 , the bottom plate 410 has an extension 412 beyond the side plate 420, the corner of the extension 412 is provided with a notch 413, the inner part of the accommodating cavity 110 is provided with a positioning protrusion 113, and the positioning protrusion 113 extends into the notch 413.

[0090] In this case, the size of the extension 412 beyond the side plate 420 can be set according to actual needs. The positioning protrusion 113 can be upwardly protruded from the bottom wall of the accommodating cavity 110, and the shape and size of the notch 413 can match those of the positioning protrusion 113. In one possible implementation, when the accommodating cavity 110 includes two chambers 111, the two ends of the positioning protrusion 113 are located in the two chambers 111, respectively. When the fire-retardant member 400 is placed in the chamber 111, the part of the positioning protrusion 113 located in the chamber 111 extends into the notch 413. Alternatively, the bottom plate 410 is provided with the extension 412 at both ends along the length direction of the bottom plate 410.

[0091] Through the cooperation between the positioning protrusion 113 and the notch 413, the fire-retardant member 400 can be quickly positioned, and the fire-retardant member 400 can be quickly placed in the accommodating cavity 110 by the staff.

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

[0093] The cross-sectional diameter of the tapered hole gradually decreases from a large-diameter end to a small-diameter end. The large-diameter end and the small-diameter end are opposite ends of the tapered hole, and the small-diameter end of the tapered hole is arranged towards the bottom wall of the accommodating cavity 110. The taper of the tapered hole can be set as required.

[0094] In this structure, the through hole 411 on the bottom plate 410 is set as a tapered hole, and the large-diameter end of the tapered hole is towards the reed valve 200, which facilitates the air filtered by the air filter to pass through the tapered hole, and then facilitates the air filtered by the air filter to mix with the exhaust gas generated by the engine and perform secondary combustion. When the high-temperature exhaust gas in the engine flows reversely in the exhaust passage 120, the high-temperature exhaust gas is not easy to pass through the tapered hole from the small-diameter end to the large-diameter end of the tapered hole, which improves the protection effect of the flame arrestor 400 on the reed valve 200, and further improves the service life of the reed valve 200.

[0095] In a possible implementation manner, as shown in Figure 14 The flame arrestor 400 includes at least two bottom plates 410, and the two bottom plates 410 are arranged in a spaced manner along the height direction of the flame arrestor 400. The through holes 411 on the adjacent two bottom plates 410 are arranged in a staggered manner.

[0096] For example, the plurality of bottom plates 410 of the flame arrestor 400 are arranged in a parallel and spaced manner. For example, the flame arrestor 400 can be provided with two bottom plates 410, and the two sides of each bottom plate 410 are connected with two side plates 420 respectively. Optionally, the two side plates 420 and the plurality of bottom plates 410 of the flame arrestor 400 can be formed as an integral piece through an integral molding process. Specifically, the projection of the through hole 411 on any bottom plate 410 along the height direction of the flame arrestor 400 does not coincide with the projection of the through hole 411 on the adjacent bottom plate 410 along the height direction of the flame arrestor 400.

[0097] In this structure, when the high-temperature exhaust gas in the engine flows reversely in the exhaust passage 120, the high-temperature exhaust gas needs to pass through the through holes 411 on the plurality of bottom plates 410 to flow to the reed valve 200. The through holes 411 on the plurality of bottom plates 410 can further cut and distribute 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 manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0099] The above embodiments only express several implementation ways of the present application, and the description is specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An engine, characterized in that: include: A body is provided with a receiving chamber and an exhaust passage communicating with the receiving chamber; a reed valve, mounted at the opening of the accommodating chamber and capable of opening and closing under the action of gas pressure in the accommodating chamber; a gland, mounted on the body and sealing the opening of the accommodating cavity; a flame retardant disposed in the accommodating cavity, the flame retardant comprising a bottom plate and two side plates located on opposite sides of the bottom plate, the two side plates being located on a side of the bottom plate facing the reed valve, and a plurality of through holes being formed on the bottom plate; In which, one end of the exhaust passage connected to the accommodating cavity and the reed valve are respectively located on opposite sides of the bottom plate, a protrusion is provided on the outer side of at least one of the two side plates, and the maximum width of the flame retardant is greater than or equal to the width of the part of the accommodating cavity that accommodates the flame retardant.

2. The engine according to claim 1, characterized in that The protrusion can be elastically deformed under the action of external force.

3. The engine according to claim 2, characterized in that The outer sides of the two side plates facing each other are protruded to form the protruding parts, and the protruding parts are formed by the parts corresponding to the side plates protruding outwards, and the side plates are provided with grooves corresponding to the inner sides of the protruding parts.

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

5. The engine according to claim 1, characterized in that The reed valve includes a support plate and a reed, wherein an air inlet is formed 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 respectively correspond to 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 accommodating chamber includes two chambers, and the two chambers are respectively communicated with the exhaust passage; There are two flame retardants, and the two flame retardants are respectively arranged in the two chambers; The support plate is provided with two air inlets, which correspond to the two chambers respectively, and a reed is provided at the position of each air inlet.

7. The engine according to claim 1, characterized in that A limiting protrusion is protruded from the interior of the accommodating cavity, the bottom plate supports and abuts against the limiting protrusion, and the top end of the side plate abuts against the reed valve.

8. The engine according to claim 1, characterized in that The bottom plate has an extension portion extending beyond the side plate, and the corners of the extension portion are provided with notches. A positioning protrusion is protruded from the interior of the accommodating cavity, and the positioning protrusion extends into the notch.

9. The engine according to claim 1, characterized in that The through hole is a tapered hole, and the large-diameter end of the tapered hole faces the reed valve.

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

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