One-way structure for exhaust gas circulation, exhaust gas recirculation system and engine assembly
By setting up Tesla valves in parallel in the EGR one-way structure and using its one-way conducting channel and reinforced column welding design, the problems of reduced life and vibration of existing EGR one-way valves are solved, achieving a higher service life and lightweight design.
Patent Information
- Application Number
- CN202422481433.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-10-14
AI Technical Summary
The valve core of the existing EGR check valve is easy to open and close during the regular entry of exhaust gas, resulting in a reduced life and continuous vibration.
Multiple Tesla valves are arranged in parallel in the accommodating chamber of the one-way structure. The internal passage of the Tesla valve is designed to be one-way conducting, and the between the Tesla valve and the shell are fixed by reinforced column welding.
It achieves no parts inside the Tesla valve when the exhaust gas enters, extends its service life, and saves materials through a lightweight design, reducing the risk of vibration and damage.
Smart Images
Figure CN223048905U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to a one-way structure for exhaust gas recirculation, an exhaust gas recirculation system and an engine assembly. Background Art
[0002] An exhaust gas recirculation system (i.e., an EGR system) is used to reduce the NOx emissions of an engine. The exhaust gas recirculation system in the system introduces the exhaust gas in the exhaust pipe into the intake pipe, so that the exhaust gas and fresh air are fully mixed before entering the cylinder. In order to prevent the fresh air from flowing back into the exhaust gas, an EGR check valve is usually provided on the exhaust gas recirculation system, and the EGR check valve is located downstream of the EGR cooler.
[0003] At present, the valve core adopted in the prior art of the EGR check valve will continuously open and close during the regular entry of the exhaust gas, which is likely to reduce the service life of the check valve and cause continuous vibration during the working process.
[0004] Therefore, there is an urgent need for a one-way structure for exhaust gas recirculation to solve the above technical problems. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a one-way structure for exhaust gas recirculation, an exhaust gas recirculation system and an engine assembly, which can improve the service life, reduce the vibration of the one-way structure, and realize the lightweight design of the one-way structure.
[0006] To achieve the above object, the utility model adopts the following technical solutions:
[0007] In the first aspect, a one-way structure for exhaust gas recirculation is provided, including:
[0008] A housing, which forms a receiving cavity, and the receiving cavity has a gas inlet and a gas outlet;
[0009] Two end plates are respectively arranged at both ends of the housing to block the gas inlet and the gas outlet;
[0010] A plurality of Tesla valves are arranged in parallel in the receiving cavity. One end of the Tesla valve is fixedly connected to one of the end plates and communicated with the gas inlet, and the other end of the Tesla valve is fixedly connected to the other end plate and communicated with the gas outlet. The Tesla valves are fixedly connected to each other and / or between the Tesla valve and the housing.
[0011] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, the Tesla valve has a plurality of first straight channels, a plurality of second straight channels, and a plurality of curved channels. The first straight channels are connected to the second straight channels and are arranged at an angle. Both ends of the curved channel are respectively connected to the first straight channel and the second straight channel to form a one-way unit, and a plurality of the one-way units are connected in series.
[0012] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, the Tesla valve further has a conduction channel. The conduction channel is connected to the one-way unit near the gas inlet and the gas inlet is respectively connected to both ends of the conduction channel. From the gas inlet to the direction of the one-way unit, the width of the conduction channel has a gradually decreasing trend.
[0013] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, the end plate connected to the conduction channel is provided with air inlets, and the projection of the large end of the conduction channel on the end face of the end plate completely overlaps with the air inlets.
[0014] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, a plurality of the air inlets are in one-to-one correspondence and communication with a plurality of the conduction channels.
[0015] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, the Tesla valves are welded together by strengthening columns; and / or,
[0016] The Tesla valve and the inner wall of the outer shell are welded together by strengthening columns.
[0017] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, the strengthening columns are arranged at the connection between the second straight channel and the curved channel, and there are a plurality of strengthening columns at each connection.
[0018] As a preferred technical solution of the one-way structure for the above-mentioned exhaust gas recirculation, along the first direction, the cross-section of the Tesla valve is rectangular.
[0019] In a second aspect, there is provided an exhaust gas recirculation system, including a gas cooling pipe device and the one-way structure for exhaust gas recirculation according to any one of the above solutions. The gas cooling pipe is connected to the gas outlet.
[0020] In a third aspect, there is provided an engine assembly, including an engine main body and the exhaust gas recirculation system according to the above solution. The exhaust port of the engine main body is connected to the gas inlet, and the intake port of the engine main body is connected to the outlet of the gas cooling pipe.
[0021] The present utility model has at least the following beneficial effects:
[0022] The one-way structure for exhaust gas circulation, exhaust gas recirculation system and engine assembly provided by the present utility model. A plurality of Tesla valves are arranged in the accommodation cavity. Since the internal channel of the Tesla valve can achieve the purpose of one-way conduction, compared with the prior art, when the exhaust gas regularly enters the inside of the Tesla valve, there is no vibration of the parts inside the Tesla valve, and the valve body of the Tesla valve will not vibrate and be damaged. In addition, the Tesla valves are fixedly connected to each other and / or between the Tesla valve and the outer shell. When the exhaust gas impacts and enters the Tesla valve regularly, the adjacent Tesla valves will not collide due to vibration, thereby improving the service life and the reliability of the one-way structure for exhaust gas circulation. In addition, a plurality of Tesla valves are located in the accommodation cavity formed by the outer shell, the weight of the outer shell is reduced, materials are saved, and the effects of light weight and cost reduction are achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.
[0024] Figure 1 It is a cross-sectional view of the one-way structure for exhaust gas circulation provided by the embodiment of the present utility model;
[0025] Figure 2 It is a schematic connection diagram of the end plate and the Tesla valve provided by the embodiment of the present utility model Figure 1 ;
[0026] Figure 3 It is a schematic connection diagram of the end plate and the Tesla valve provided by the embodiment of the present utility model Figure 2 .
[0027] In the figure:
[0028] 1. Outer shell; 2. End plate; 21. Air inlet hole; 3. Tesla valve; 31. First straight channel; 32. Second straight channel; 33. Bending channel; 34. Conducting channel; 4. Reinforcing column. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0029] The following will further elaborate on the present utility model in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only parts related to the present utility model are shown in the drawings rather than all the structures.
[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.
[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.
[0033] The present utility model provides a one-way structure for exhaust gas circulation, which can avoid the reduction of service life due to the regular vibration of the engine exhaust gas inside the one-way structure. In addition, a lightweight design can also be achieved.
[0034] As Figures 1-3 shown, the one-way structure for exhaust gas circulation includes a housing 1, two end plates 2, and a plurality of Tesla valves 3. The housing 1 forms a receiving cavity, and the receiving cavity has a gas inlet and a gas outlet. The two end plates 2 are respectively arranged at both ends of the housing 1 to block the gas inlet and the gas outlet. A plurality of Tesla valves 3 are arranged in parallel in the receiving cavity. One end of the Tesla valve 3 is fixedly connected to one of the end plates 2 and communicated with the gas inlet, and the other end of the Tesla valve 3 is fixedly connected to the other end plate 2 and communicated with the gas outlet. The Tesla valves 3 are fixedly connected to each other and / or to the housing 1.
[0035] A plurality of Tesla valves 3 are arranged in the accommodating cavity. Since the internal channels of the Tesla valves 3 can achieve the purpose of unidirectional conduction, compared with the prior art, when the exhaust gas regularly enters the interior of the Tesla valves 3, there is no vibration of the parts inside the Tesla valves 3, and the valve bodies of the Tesla valves 3 will not vibrate and be damaged. In addition, the Tesla valves 3 are fixedly connected to each other and / or between the Tesla valves 3 and the housing 1. When the exhaust gas impacts and enters the Tesla valves 3 regularly, adjacent Tesla valves 3 will not collide due to vibration, thereby improving the service life and the reliability of the unidirectional structure for exhaust gas circulation. In addition, a plurality of Tesla valves 3 are located in the accommodating cavity formed by the housing 1, the weight of the housing 1 is reduced, materials are saved, and the effects of light weight and cost reduction are achieved.
[0036] It should be noted that there is a certain distance between the end plate 2 and the end face of the housing 1, so that the gas can be gathered at the port of the housing 1, facilitating the gas to enter the Tesla valve 3.
[0037] In some embodiments, with continued reference to Figures 1-3 , the Tesla valve 3 has a plurality of first straight channels 31, a plurality of second straight channels 32 and a plurality of curved channels 33. The first end of one first straight channel 31 is connected to the first end of one second straight channel 32 and is arranged at an angle. The two ends of one curved channel 33 are respectively connected to the second end of the first straight channel 31 and the second end of the second straight channel 32 to form a unidirectional unit. A plurality of unidirectional units are connected in series to form the Tesla valve 3. After the gas enters from the second end of the first straight channel 31, part of the gas will flow into the curved channel 33, and then flow out from the second straight channel 32 and converge with the gas in the first straight channel 31, and then flow into the next unidirectional unit from the second end of the next first straight channel 31. When the gas flows from the first end of the first straight channel 31 to the second end of the first straight channel 31, part of the gas flows from the second straight channel 32 to the curved channel 33 and mixes with the gas in the first straight channel 31. However, the gas flow direction in the curved channel 33 is opposite to the gas flow direction in the first straight channel 31, which will mutually hinder the gas flow, cause energy damage to the gas, and delay the gas flow rate, thereby achieving the purpose of unidirectional conduction.
[0038] In order to allow more gas to enter the Tesla valve 3, in some embodiments, the Tesla valve 3 further has a conduction channel 34. The unidirectional unit near the gas inlet and the gas inlet are respectively connected to both ends of the conduction channel 34. From the gas inlet towards the unidirectional unit direction, the width of the conduction channel 34 has a gradually decreasing trend. Such a setting can not only increase the inflow of gas, but also guide the gas so that the gas can enter the unidirectional unit as soon as possible.
[0039] As Figure 3As shown, the end plate 2 connected to the conduction channel 34 is provided with an air inlet hole 21, and the projection of the large end of the conduction channel 34 on the end face of the end plate 2 completely overlaps with the air inlet hole 21. The number of the air inlet holes 21 provided on the end plate 2 is multiple, and the multiple air inlet holes 21 are in one-to-one correspondence and communication with the multiple conduction channels 34. In this way, the air intake of each Tesla valve 3 can be ensured, and further the air intake of the one-way structure for exhaust gas recirculation can be increased.
[0040] Of course, in other embodiments, the projection of the large end of the conduction channel 34 on the end face may overlap with multiple air inlet holes 21, that is, one conduction channel 34 may be correspondingly arranged with multiple air inlet holes 21, which can also increase the air intake. In addition, this setting method can filter out some impurities carried in the exhaust gas, reduce the probability of the overall one-way structure being blocked, and improve the service life.
[0041] Specifically, the Tesla valves 3 are welded by the strengthening columns 4, that is, the outer side walls of the Tesla valves 3 are welded by the strengthening columns 4. The strengthening columns 4 can be in a columnar structure or can be welding points. The material of the strengthening columns 4 is the same as that of the Tesla valves 3, and both are metal materials, so that they can withstand high temperatures and avoid the melting failure of the strengthening columns 4 caused by excessive waste heat of the exhaust gas.
[0042] In some embodiments, the Tesla valves 3 are welded to the inner wall of the housing 1 by the strengthening columns 4. In some other embodiments, the Tesla valves 3 are welded by the strengthening columns 4, and the Tesla valves 3 are also welded to the inner wall of the housing 1 by the strengthening columns 4.
[0043] Specifically, the strengthening columns 4 are arranged at the connection between the second straight channel 32 and the bending channel 33, and there are multiple strengthening columns 4 at each connection. In order to avoid the transmission of vibration between the Tesla valves 3, generally, the adjacent Tesla valves 3 are arranged at intervals and non-contact in the accommodation cavity. However, the number of Tesla valves 3 arranged in this setting method is small, resulting in a low air intake. When the Tesla valves 3 are arranged in contact with each other, when the Tesla valves 3 vibrate due to the influence of air flow inside, they will collide with the adjacent Tesla valves 3. The strengthening columns 4 are arranged at the connection between the second straight channel 32 and the bending channel 33, which can fixedly connect and compactly arrange the adjacent Tesla valves 3, and increase the air intake of the one-way structure for exhaust gas recirculation. The number of the strengthening columns 4 at each connection is multiple, so as to improve the stability between the Tesla valves 3 and between the Tesla valves 3 and the housing 1.
[0044] Along the first direction, the cross-section of the Tesla valve 3 is rectangular. Compared with a circular shape, a rectangle can allow more exhaust gas to enter. Secondly, the cross-sectional area of the rectangle increases. Compared with the Tesla valve 3 with a circular cross-section, the gap between adjacent Tesla valves 3 decreases, the arrangement is more compact, and it is also easier to be arranged in the housing 1.
[0045] An embodiment of the present utility model further provides an exhaust gas recirculation system, which includes a gas cooling pipe and a one-way structure for exhaust gas circulation provided by the embodiment of the present utility model. The gas cooling pipe is communicated with the gas outlet. The one-way structure for exhaust gas circulation includes a housing 1 and a plurality of Tesla valves 3 arranged inside the housing 1. The plurality of Tesla valves 3 are arranged in the accommodation cavity. Since the internal channel of the Tesla valve 3 can achieve the purpose of one-way conduction, compared with the prior art, when the exhaust gas regularly enters the inside of the Tesla valve 3, there is no vibration of parts inside the Tesla valve 3. At the same time, the Tesla valves 3 are fixedly connected to each other and / or between the Tesla valve 3 and the housing 1. When the exhaust gas regularly impacts and enters the Tesla valve 3, the adjacent Tesla valves 3 will not collide due to vibration, thereby improving the service life. In addition, the plurality of Tesla valves 3 are located in the accommodation cavity formed by the housing 1, and the weight of the housing 1 is reduced, so that the one-way structure for exhaust gas circulation can achieve a lightweight design.
[0046] An embodiment of the present utility model further provides an engine assembly, which includes an engine main body and the exhaust gas recirculation system provided by the present utility model. The exhaust port of the engine main body is communicated with the gas inlet, and the intake port of the engine main body is communicated with the outlet of the gas cooling pipe. The one-way structure for exhaust gas circulation includes a housing 1 and a plurality of Tesla valves 3 arranged inside the housing 1. The plurality of Tesla valves 3 are arranged in the accommodation cavity. Since the internal channel of the Tesla valve 3 can achieve the purpose of one-way conduction, compared with the prior art, when the exhaust gas regularly enters the inside of the Tesla valve 3, there is no vibration of parts inside the Tesla valve 3. At the same time, the Tesla valves 3 are fixedly connected to each other and / or between the Tesla valve 3 and the housing 1. When the exhaust gas regularly impacts and enters the Tesla valve 3, the adjacent Tesla valves 3 will not collide due to vibration, thereby improving the service life. In addition, the plurality of Tesla valves 3 are located in the accommodation cavity formed by the housing 1, and the weight of the housing 1 is reduced, so that the one-way structure for exhaust gas circulation can achieve a lightweight design.
[0047] In addition, the above is only the preferred embodiment of the present utility model and the applied technical principle. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.
Claims
1. One-way structure for exhaust gas circulation, characterized in that: include: A housing (1) is formed with a receiving chamber, wherein the receiving chamber has a gas inlet and a gas outlet; Two end plates (2) are respectively arranged at two ends of the shell (1) to block the gas inlet and the gas outlet; A plurality of Tesla valves (3) are arranged in parallel in the accommodating cavity, one end of the Tesla valve (3) is fixedly connected to one of the end plates (2) and communicated with the gas inlet, the other end of the Tesla valve (3) is fixedly connected to another end plate (2) and communicated with the gas outlet, and the Tesla valves (3) and / or the Tesla valves (3) and the housing (1) are fixedly connected.
2. The one-way structure for exhaust gas circulation according to claim 1, characterized in that: The Tesla valve (3) comprises a plurality of first straight channels (31), a plurality of second straight channels (32) and a plurality of curved channels (33); the first straight channels (31) are connected to the second straight channels (32) and are arranged at an angle; the two ends of the curved channel (33) are respectively connected to the first straight channels (31) and the second straight channels (32) to form a one-way unit; and the plurality of the one-way units are connected in series.
3. The one-way structure for exhaust gas circulation according to claim 2, characterized in that: The Tesla valve (3) further comprises a conducting channel (34), which is connected to a one-way unit near the gas inlet and the gas inlet is respectively connected to two ends of the conducting channel (34), and the width of the conducting channel (34) tends to gradually decrease from the gas inlet to the one-way unit.
4. The one-way structure for exhaust gas circulation according to claim 3, characterized in that: The end plate (2) connected to the conducting channel (34) is provided with an air inlet hole (21), and the projection of the large end of the conducting channel (34) on the end surface of the end plate (2) completely overlaps with the air inlet hole (21).
5. The one-way structure for exhaust gas circulation according to claim 4, characterized in that: The plurality of air inlet holes (21) are connected to the plurality of conduction channels (34) in a one-to-one correspondence.
6. The one-way structure for exhaust gas circulation according to claim 2, characterized in that: The Tesla valves (3) are welded via reinforcing columns (4); and / or, The Tesla valve (3) is welded to the inner wall of the housing (1) via a reinforcing column (4).
7. The one-way structure for exhaust gas circulation according to claim 6, characterized in that: The reinforcing column (4) is arranged at the connection between the second straight channel (32) and the curved channel (33), and there are a plurality of reinforcing columns (4) at each connection.
8. The one-way structure for exhaust gas circulation according to claim 1, characterized in that: Along the first direction, the cross-section of the Tesla valve (3) is rectangular.
9. Exhaust gas recirculation system, characterized in that, It comprises a gas cooling pipe and a one-way structure for exhaust gas circulation as claimed in any one of claims 1 to 8, wherein the gas cooling pipe is connected to the gas outlet.
10. An engine assembly, characterized in that: The invention comprises an engine body and the exhaust gas recirculation system as claimed in claim 9, wherein an exhaust port of the engine body is communicated with the gas inlet, and an air intake port of the engine body is communicated with an outlet of the gas cooling pipe.