Valve arrangement structure and engine

Abstract

The invention relates to an air valve arrangement structure and an engine, the air valve arrangement structure comprises a top cylinder cover and a flexible air valve assembly, the flexible air valve assembly comprises an air valve seat and an air valve body, the air valve seat is arranged at an air channel throat of the top cylinder cover, and the air valve body comprises an air valve rod part, an air valve disc part and an elastic connecting part; the first end of the valve rod part is in sliding sealing fit with the tent top cylinder cover, the second end of the valve rod part extends into the air channel, the connecting end of the valve retainer part penetrates through the valve seat from the side, facing the air cylinder, of the valve seat to extend into the air channel, and the connecting end of the valve retainer part is connected to the second end of the valve rod part through an elastic connecting part. The elastic connecting part is used for enabling the valve retainer part to swing relative to the valve rod part; and when the valve rod part drives the valve retainer part to reciprocate through the elastic connecting part, the side, close to the roof ridge of the roof cylinder cover, of the disc end of the valve retainer part is firstly in contact with the valve seat. The air valve arrangement structure can improve the scavenging effect and reduce direct discharge of mixed fuel gas.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a valve structure, valve arrangement structure, and engine. Background Technology

[0002] When the engine exhaust valve is about to close, the intake valve opens. At this time, both the intake and exhaust valves are open. Gas enters the cylinder through the intake manifold, and the fresh gas pushes the combustion exhaust gas out of the cylinder. This process is called "scavenging". This process not only allows more fresh gas to enter the cylinder, but also reduces the cylinder temperature, reduces the knock intensity in the cylinder, optimizes combustion, lowers exhaust temperature, and improves reliability.

[0003] Scavenging is crucial for engines. When the cylinder head is a canopy-top cylinder head, during scavenging, the airflow passes directly from the intake valve through the canopy ridge of the cylinder head and exits directly from the exhaust valve. This fails to scaveng the residual exhaust gases in the cylinder and causes the combustion gases to directly enter the exhaust manifold, resulting in excessive engine emissions. Summary of the Invention

[0004] The first objective of this invention is to provide a valve arrangement structure that improves scavenging capability and reduces the direct discharge of mixed combustion gas.

[0005] A second objective of the present invention is to provide an engine employing the above-described valve arrangement structure.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] In a first aspect of this application, a valve arrangement structure is provided, including a cylinder head and a flexible valve assembly. The flexible valve assembly includes a valve seat and a valve body. The valve seat is disposed at the air passage throat of the cylinder head. The valve body includes a valve stem, a valve disc, and an elastic connecting portion. A first end of the valve stem is reciprocally movable along its own axis and is sealed to the cylinder head. A second end of the valve stem extends into the air passage of the cylinder head. A connecting end of the valve disc extends from the valve seat toward the cylinder, through the valve seat, into the air passage of the cylinder head. The connecting end of the valve disc is connected to the second end of the valve stem via the elastic connecting portion. The valve stem drives the valve disc to move relative to the valve seat via the elastic connecting portion to adjust the valve opening. The elastic connecting portion allows the valve disc to swing relative to the valve stem.

[0008] When the elastic connection is not subjected to external force, the end face of the disc end of the valve plate is set at an angle to the side surface of the valve seat facing the cylinder, so that the side of the disc end of the valve plate near the ridge of the cylinder head first contacts the valve seat; when the side of the disc end of the valve plate near the ridge of the cylinder head contacts the valve seat and the valve stem continues to move away from the valve seat, the valve plate swings relative to the valve stem so that the side of the disc end of the valve plate away from the ridge of the cylinder head moves closer to the valve seat.

[0009] In one possible implementation, the cylinder head is provided with an intake manifold and an exhaust manifold, an intake valve assembly is provided in the intake manifold, and an exhaust valve assembly is provided in the exhaust manifold, wherein at least one of the intake valve assembly and the exhaust valve assembly is the flexible valve assembly.

[0010] In one possible implementation, the exhaust valve assembly is the flexible valve assembly.

[0011] In one possible implementation, both the intake valve assembly and the exhaust valve assembly are the flexible valve assembly.

[0012] In one possible implementation, when the end face of the disc end of the valve disc is not subjected to external force, the angle δ between the end face of the valve disc and the side surface of the valve seat facing the cylinder satisfies 0°<δ≤5°.

[0013] In one possible implementation, when the elastic connection is not subjected to external force, the valve disc and the valve stem are coaxial; when the disc end of the valve disc is circumferentially engaged with the valve seat, the axis of the valve disc is set at an angle to the axis of the valve stem.

[0014] In one possible implementation, when the disc end of the valve disc engages circumferentially with the valve seat, the included angle θ between the axis of the valve disc and the axis of the valve stem satisfies 0°<θ≤5°.

[0015] In one possible implementation, the elastic connection is a helical spring, and when the elastic connection is not subjected to external force, the helical spring, the valve disc, and the valve stem are coaxial or parallel.

[0016] As can be seen from the above technical solutions, this invention discloses a valve arrangement structure, which includes a cylinder head and a flexible valve assembly. The flexible valve assembly includes a valve seat and a valve body. The valve seat is disposed at the air passage throat of the cylinder head. The valve body includes a valve stem, a valve disc, and an elastic connecting portion. The first end of the valve stem can reciprocate along its own axis to seal against the cylinder head. The second end of the valve stem extends into the air passage of the cylinder head. The connecting end of the valve disc extends from the side of the valve seat facing the cylinder, through the valve seat, into the air passage of the cylinder head. The connecting end of the valve disc is connected to the second end of the valve stem via the elastic connecting portion. The valve stem section drives the valve disc section to move relative to the valve seat through the elastic connection section to adjust the valve opening. The elastic connection section is used to enable the valve disc section to swing relative to the valve stem section. When the elastic connection section is not subjected to external force, the end face of the disc end of the valve disc section is set at an angle to the side of the valve seat facing the cylinder, so that the side of the disc end of the valve disc section closest to the ridge of the cylinder head first contacts the valve seat. When the side of the disc end of the valve disc section closest to the ridge of the cylinder head contacts the valve seat and the valve stem section continues to move away from the valve seat, the valve disc section swings relative to the valve stem section, so that the side of the disc end of the valve disc section away from the ridge of the cylinder head approaches the valve seat.

[0017] In application, at least one of the engine's intake valve assembly and exhaust valve assembly can be made using the aforementioned flexible valve assembly. During the initial stage of the intake stroke, the flexible valve assembly is in an elastic connection section and is not subject to external force. The disc end of the valve plate is in contact with the valve seat on the side of the cylinder head roof ridge that is close to the cylinder head roof. At this time, a gap is formed between the disc end of the valve plate away from the cylinder head roof ridge and the valve seat. If the flexible valve assembly is an intake valve assembly, the intake air can only flow into the cylinder from the side of the intake valve assembly away from the exhaust valve assembly, avoiding the direct flow of the intake air into the exhaust passage through the roof ridge. This prevents the intake air from failing to achieve the scavenging effect in the intake passage and causing the combustion gas to directly enter the exhaust passage.

[0018] If the flexible valve assembly is an exhaust valve assembly, the intake air must move in the cylinder to the side of the exhaust valve away from the roof ridge. In this process, it plays a scavenging role and increases the time for the intake air to move to the gap between the exhaust valve and the valve seat, allowing enough time for the exhaust valve to close completely, thereby preventing the combustion gas from flowing directly into the exhaust passage.

[0019] If both the exhaust valve assembly and the intake valve assembly are flexible valve assemblies, the intake air must enter from the side of the intake valve away from the roof ridge, and then flow around the entire cylinder to the side of the exhaust valve away from the roof ridge. This achieves a thorough scavenging effect inside the cylinder and maximizes the residence time of the combustion gas in the cylinder, allowing sufficient time for the exhaust valve to close.

[0020] It is evident that the valve arrangement structure in this embodiment can prevent the combustion gas from directly entering the exhaust passage from the exhaust valve and increase the residence time of the combustion gas in the cylinder, which not only allows time for the exhaust valve to close, but also improves the scavenging effect.

[0021] In a second aspect of this application, an engine is provided, including the valve arrangement structure described in the first aspect and its possible implementations.

[0022] In one possible implementation, the engine is a premixed gas engine.

[0023] The engine provided in this application adopts the above-mentioned valve arrangement structure, and therefore should have the same beneficial effects as the valve arrangement structure, which will not be elaborated here. Attached Figure Description

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

[0025] Figure 1 A schematic diagram of the valve arrangement structure provided in the embodiment of this application in a scavenging state;

[0026] Figure 2 This is a schematic diagram of the valve arrangement structure provided in the embodiment of this application in a closed state.

[0027] In the picture:

[0028] 100 is the cylinder head with a canopy; 110 is the intake manifold; 120 is the exhaust manifold; 200 is the exhaust valve assembly; 210 is the exhaust valve body; 211 is the exhaust valve stem; 212 is the exhaust valve disc; 2121 is the end face of the disc end of the exhaust valve disc; 213 is the first elastic connection; 220 is the exhaust valve seat; 221 is the side surface of the exhaust valve seat facing the cylinder; 300 is the intake valve assembly; 310 is the intake valve body; 311 is the intake valve stem; 312 is the intake valve disc; 3121 is the end face of the disc end of the intake valve disc; 313 is the second elastic connection; 320 is the intake valve seat; 321 is the side surface of the intake valve seat facing the cylinder; 400 is the cylinder. Detailed Implementation

[0029] One of the core aspects of this invention is to provide a valve arrangement structure, the structural design of which enables it to improve scavenging capability and reduce the direct discharge of mixed combustion gas.

[0030] Another core aspect of this invention is to provide an engine employing the above-described valve arrangement structure.

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Currently, most mainstream engines are four-stroke engines, meaning that the piston goes through four key stages to complete a full working cycle in the cylinder: intake stroke, compression stroke, power stroke, and exhaust stroke. During the intake stroke, the piston moves downwards from top dead center, the intake valve opens, and the exhaust valve closes. As the piston descends, a negative pressure is created in the cylinder, drawing the air-fuel mixture into the combustion chamber. During the compression stroke, the piston moves upwards, both the intake and exhaust valves close, and the mixture is compressed to a high temperature and high pressure state, preparing for subsequent combustion. During the power stroke, the ignition device ignites the compressed mixture, and the high-temperature gas expands, pushing the piston downwards, which in turn drives the crankshaft to rotate, generating power. During the exhaust stroke, the piston moves upwards again, the exhaust valve opens, the intake valve closes, and the combusted exhaust gases are expelled from the cylinder, then the next cycle begins.

[0033] During the intake stroke, when the intake valve just opens, the exhaust valve is not completely closed. At this time, the gas-fuel mixture entering the cylinder from the intake valve can scavenge the residual exhaust gas in the cylinder and expel the combustion exhaust gas from the cylinder. However, in the existing cylinder head valve arrangement structure, there are gaps in the circumference of both the intake and exhaust valves when they are open. When both the intake and exhaust valves are open, part of the gas-fuel mixture will flow directly from the side of the intake valve near the ridge of the cylinder head, and then flow directly out from the side of the exhaust valve near the ridge of the cylinder head. This not only fails to achieve the scavenging effect, but also causes the gas to be directly discharged into the exhaust manifold.

[0034] Based on this, the embodiments of this application provide a valve arrangement structure, please refer to... Figure 1 and Figure 2 The valve arrangement structure includes a cylinder head 100 with a canopy and a flexible valve assembly.

[0035] The flexible valve assembly includes a valve seat and a valve body. The valve seat is located at the air passage throat of the cylinder head 100. The valve body includes a valve stem, a valve disc, and an elastic connecting part. The first end of the valve stem can reciprocate along its own axis to seal against the cylinder head 100. The second end of the valve stem extends into the air passage of the cylinder head 100. The connecting end of the valve disc extends from the valve seat toward the cylinder 400 through the valve seat and into the air passage of the cylinder head 100. The connecting end of the valve disc is connected to the second end of the valve stem through the elastic connecting part. The valve stem drives the valve disc to move relative to the valve seat through the elastic connecting part to adjust the valve opening.

[0036] The flexible connection allows the valve disc to swing relative to the valve stem. When the flexible connection is not subjected to external force, the end face of the disc end of the valve disc is angled to the side of the valve seat facing the cylinder 400, so that the side of the disc end of the valve disc closest to the ridge of the cylinder head 100 contacts the valve seat first. At this time, there is a gap between the side of the disc end of the valve disc away from the ridge of the cylinder head 100 and the valve seat. When the side of the disc end of the valve plate close to the ridge of the cylinder head 100 contacts the valve seat and the valve stem continues to move away from the valve seat, the valve plate swings relative to the valve stem so that the side of the disc end of the valve plate away from the ridge of the cylinder head 100 approaches the valve seat, until the side of the disc end of the valve plate away from the ridge of the cylinder head 100 contacts and engages with the valve seat. At this time, the valve plate and the valve seat engage circumferentially to close the valve.

[0037] In application, at least one of the engine's intake valve assembly 300 and exhaust valve assembly 200 can adopt the aforementioned flexible valve assembly. During the initial stage of the intake stroke, both the exhaust and intake valves are open. The flexible valve assembly is in the open state at this time as follows: the flexible valve assembly is in a state where the elastic connection is not subjected to external force, and the disc end of the valve plate is in contact with the valve seat on the side near the roof ridge of the cylinder head 100. At this time, a gap is formed between the disc end of the valve plate away from the roof ridge of the cylinder head 100 and the valve seat.

[0038] If the flexible valve assembly is the intake valve assembly 300 and the exhaust valve assembly 200 is a conventional valve assembly, then the intake air can only flow into the cylinder 400 from the side of the intake valve assembly 300 away from the exhaust valve assembly 200, avoiding the flow of the intake air directly into the exhaust passage 120 through the exhaust valve, thereby preventing the intake air from failing to achieve the scavenging effect and causing the combustion gas to directly enter the exhaust passage 120.

[0039] If the flexible valve assembly is the exhaust valve assembly 200 and the intake valve assembly 300 is a conventional valve assembly, then the intake air must move in the cylinder 400 to the side of the exhaust valve away from the roof ridge. In this process, it plays a scavenging role and increases the time for the intake air to move to the gap between the exhaust valve and the valve seat, allowing enough time for the exhaust valve to close completely, thereby preventing the combustion gas from flowing directly into the exhaust passage 120.

[0040] If both the exhaust valve assembly 200 and the intake valve assembly 300 are flexible valve assemblies, the intake air must enter from the side of the intake valve away from the roof ridge, and then flow around the entire cylinder 400 to the side of the exhaust valve away from the roof ridge. This achieves a thorough scavenging effect inside the cylinder 400 and maximizes the residence time of the combustion gas in the cylinder 400, allowing sufficient time for the exhaust valve to close.

[0041] Compared with the prior art, the valve arrangement structure provided in this application embodiment can prevent the gas from directly entering the exhaust passage 120 from the exhaust valve and increase the residence time of the gas in the cylinder 400, which not only allows time for the exhaust valve to close, but also improves the scavenging effect.

[0042] In one embodiment of this application, the cylinder head 100 is provided with an intake passage 110 and an exhaust passage 120. An intake valve assembly 300 is provided in the intake passage 110, and an exhaust valve assembly 200 is provided in the exhaust passage 120. At least one of the intake valve assembly 300 and the exhaust valve assembly 200 is a flexible valve assembly.

[0043] Specifically, in one embodiment, at least the exhaust valve assembly 200 is a flexible valve assembly.

[0044] In one specific embodiment of this application, such as Figure 1 and Figure 2 As shown, both the intake valve assembly 300 and the exhaust valve assembly 200 are flexible valve assemblies. The exhaust valve assembly 200 includes an exhaust valve seat 220 and an exhaust valve body 210. The exhaust valve seat 220 is disposed at the throat of the exhaust passage 120 of the cylinder head 100. The exhaust valve body 210 includes an exhaust valve stem portion 211, an exhaust valve disc portion 212, and a first elastic connecting portion 213. The intake valve assembly 300 includes an intake valve seat 320 and an intake valve body 310. The intake valve seat 320 is disposed at the throat of the intake passage 110 of the cylinder head 100. The intake valve body 310 includes an intake valve stem portion 311, an intake valve disc portion 312, and a second elastic connecting portion 313.

[0045] It is foreseeable that when the elastic connection is not subjected to external force, and the side of the valve disc near the ridge of the cylinder head 100 contacts the valve seat, the gap between the side of the valve disc away from the ridge of the cylinder head 100 and the valve seat does not need to be too large. If this gap is too large, it will affect the timing and speed of valve closing, and cause the elastic connection to deform significantly, making it prone to damage. Therefore, in a specific embodiment of this application, such as Figure 1 As shown, when the elastic connection is not subjected to external force, the angle δ between the end face of the disc end of the valve plate portion and the side surface of the valve seat facing the cylinder 400 satisfies 0°<δ≤5°. It should be noted that when the first elastic connection 213 is not subjected to external force, the angle δ1 between the end face 2121 of the disc end of the exhaust valve plate portion 212 and the side surface 221 of the exhaust valve seat 220 facing the cylinder 400, and the angle δ2 between the end face 3121 of the disc end of the intake valve plate portion 312 and the side surface 321 of the intake valve seat 320 facing the cylinder 400, are both greater than 0° and less than or equal to 5°. Of course, δ1 and δ2 can be the same or different, which is not limited here.

[0046] like Figure 1 As shown, in one embodiment of this application, when the elastic connection is not subjected to external force, the valve disc and valve stem are coaxial. When the disc end of the valve disc is circumferentially engaged with the valve seat, the axis of the valve disc is set at an angle to the axis of the valve stem. Conversely, when the elastic connection is not subjected to external force, the axis of the valve disc is set at an angle to the axis of the valve stem, and the disc end of the valve disc is circumferentially engaged with the valve seat, the valve disc and valve stem are coaxial. Alternatively, when the elastic connection is not subjected to external force, the axis of the valve disc is set at an angle to the axis of the valve stem, and the disc end of the valve disc is circumferentially engaged with the valve seat, the axis of the valve disc is also set at an angle to the axis of the valve stem.

[0047] Please see Figure 2 In one embodiment of this application, when the disc end of the valve disc portion is circumferentially engaged with the valve seat, the included angle θ between the axis of the valve disc portion and the axis of the valve stem portion satisfies 0°<θ≤5°. Specifically, when the disc end of the exhaust valve disc portion 212 is circumferentially engaged with the exhaust valve seat 220, the included angle θ1 between the axis of the exhaust valve disc portion 212 and the axis of the exhaust valve stem portion 211 satisfies 0°<θ1≤5°. When the disc end of the intake valve disc portion 312 is circumferentially engaged with the intake valve seat 320, the included angle θ2 between the axis of the intake valve disc portion 312 and the axis of the intake valve stem portion 311 satisfies 0°<θ2≤5°.

[0048] The elastic connector can take various structures. Since it is used in the high-temperature cylinder head 100, its material should be heat-resistant and have good durability to avoid reducing engine reliability. The elastic connector includes, but is not limited to, torsion springs, coil springs, etc. In one embodiment of this application, such as... Figure 1 and Figure 2 As shown, the elastic connection part is a helical spring. When the elastic connection part is not subjected to external force, the helical spring, valve disc and valve stem are coaxial or parallel. One or more helical springs can be provided between the valve disc and the valve stem.

[0049] This application also provides an engine that includes the valve arrangement structure described in any of the above embodiments. Since the engine adopts the valve arrangement structure in the above embodiments, the technical effect of the engine can be referred to the above embodiments.

[0050] The engine is preferably a premixed gas engine with a canopy cylinder head 100.

[0051] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0052] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0053] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A valve arrangement structure, characterized in that, The system includes a cylinder head (100) and a flexible valve assembly. The flexible valve assembly includes a valve seat and a valve body. The valve seat is disposed at the air passage throat of the cylinder head (100). The valve body includes a valve stem, a valve disc, and an elastic connecting part. The first end of the valve stem is reciprocally movable along its own axis and is sealed to the cylinder head (100). The second end of the valve stem extends into the air passage of the cylinder head (100). The connecting end of the valve disc extends from the valve seat toward the cylinder (400) through the valve seat and into the air passage of the cylinder head (100). The connecting end of the valve disc is connected to the second end of the valve stem through the elastic connecting part. The valve stem drives the valve disc to move relative to the valve seat through the elastic connecting part to adjust the valve opening. The elastic connecting part is used to enable the valve disc to swing relative to the valve stem. When the elastic connection is not subjected to external force, the end face of the disc end of the valve plate is set at an angle to the side surface of the valve seat facing the cylinder (400), so that the side of the disc end of the valve plate close to the roof ridge of the cylinder head (100) contacts the valve seat first; when the side of the disc end of the valve plate close to the roof ridge of the cylinder head (100) contacts the valve seat and the valve stem continues to move away from the valve seat, the valve plate swings relative to the valve stem so that the side of the disc end of the valve plate away from the roof ridge of the cylinder head (100) approaches the valve seat.

2. The valve arrangement structure according to claim 1, characterized in that, The cylinder head (100) is provided with an intake manifold (110) and an exhaust manifold (120). An intake valve assembly is provided in the intake manifold (110), and an exhaust valve assembly is provided in the exhaust manifold (120). At least one of the intake valve assembly and the exhaust valve assembly is the flexible valve assembly.

3. The valve arrangement structure according to claim 2, characterized in that, The exhaust valve assembly is the flexible valve assembly.

4. The valve arrangement structure according to claim 2, characterized in that, Both the intake valve assembly and the exhaust valve assembly are flexible valve assemblies.

5. The valve arrangement structure according to any one of claims 1-4, characterized in that, When the end face of the disc end of the valve plate is not subjected to external force, the angle δ between the end face of the valve plate and the side surface of the valve seat facing the cylinder (400) satisfies 0°<δ≤5°.

6. The valve arrangement structure according to any one of claims 1-4, characterized in that, When the elastic connection is not subjected to external force, the valve disc and the valve stem are coaxial; when the disc end of the valve disc is circumferentially engaged with the valve seat, the axis of the valve disc is set at an angle to the axis of the valve stem.

7. The valve arrangement structure according to claim 6, characterized in that, When the disc end of the valve plate is circumferentially engaged with the valve seat, the included angle θ between the axis of the valve plate and the axis of the valve stem satisfies 0°<θ≤5°.

8. The valve arrangement structure according to any one of claims 1-4, characterized in that, The elastic connection is a helical spring. When the elastic connection is not subjected to external force, the helical spring, the valve disc, and the valve stem are coaxial or parallel.

9. An engine, characterized in that, Includes the valve arrangement structure as described in any one of claims 1-8.

10. The engine according to claim 9, characterized in that, The engine is a premixed gas engine.

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