Open type circulating breathing device and engine

Abstract

The utility model relates to the technical field of engines, in particular to an open type circulating breathing device and an engine. The open type circulating breathing device comprises an active oil-gas separator and a passive oil-gas separator, and a gas outlet pipe of the active oil-gas separator is communicated with a gas inlet pipe of the passive oil-gas separator. The passive oil-gas separator comprises a shell and a filter element, a step is arranged on the inner wall of the shell, the filter element comprises a supporting frame and a filter medium layer, the supporting frame comprises a supporting plate and a supporting cylinder, the outer diameter of the supporting plate is larger than that of the supporting cylinder, the supporting plate is installed on the step on the inner wall of the shell, and the filter medium layer is arranged on the supporting plate. The outer wall of the supporting plate is in sealing fit with the inner wall of the shell, and the filtering medium layer is wound on the supporting cylinder. The oil-gas separator solves the problem that the existing oil-gas separator is difficult to filter PN with the particle size of more than 10nm in blow-by gas of a crankcase.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an open cycle breathing device and an engine. Background Art

[0002] The pollutants emitted by diesel engines are mainly combustion exhaust gases directly discharged from the exhaust pipe and crankcase blowby gases. As the control of exhaust pipe emissions becomes increasingly stringent, the control of combustion exhaust gases directly discharged from the exhaust pipe has achieved remarkable results. The proportion of pollutants in crankcase blowby gases in the total pollutants of diesel engines has increased accordingly. In order to further reduce pollutant emissions, crankcase blowby gases must be controlled.

[0003] As the requirements for the filtering performance of crankcase PN (Particle number) emissions become increasingly stringent, existing oil-gas separators are difficult to filter PN above 10nm in crankcase blowby gas, which easily causes the problem of excessive PN emissions from the oil-gas separator. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide an open cycle breathing device and an engine to solve the problem that the existing oil-gas separator is difficult to filter PN above 10nm in the crankcase blowby gas.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] An open-circuit breathing device comprises: an active oil-gas separator and a passive oil-gas separator, wherein the outlet pipe of the active oil-gas separator is connected to the inlet pipe of the passive oil-gas separator; the passive oil-gas separator comprises a shell and a filter element, the inner wall of the shell is provided with a step, the filter element comprises a support frame and a filter medium layer, the support frame comprises a support plate and a support cylinder, the outer diameter of the support plate is larger than the outer diameter of the support cylinder, the support plate is mounted on the step of the inner wall of the shell, and the outer wall of the support plate is sealed with the inner wall of the shell, and the filter medium layer is wound on the support cylinder.

[0007] Optionally, a groove is provided on the outer side surface of the support plate, the groove is an annular groove, the opening of the annular groove is away from the axis of the support plate, a sealing ring is provided in the groove, and the sealing ring is squeezed in a sealing cavity formed by the groove and the inner wall of the shell.

[0008] Optionally, the support frame further includes a bottom plate, the support plate is located at the upper end of the support tube, the bottom plate is located at the lower end of the support tube, and the bottom plate blocks the bottom opening of the support tube.

[0009] Optionally, ventilation holes are provided on the wall of the support tube, and the ventilation holes are arranged radially. The outer diameter of the bottom plate is larger than the outer diameter of the support tube, and the filter medium layer is located between the support plate and the bottom plate.

[0010] Optionally, the filter element further includes a gripping member, which is disposed on the support plate. The gripping member includes a gripping portion and a connecting portion, the connecting portion is mounted on the support plate, and the gripping portion is disposed on the connecting portion.

[0011] Optionally, the holding portion is a handle, the handle is annular, the connecting portion is a connecting rod, there are at least two connecting rods, and the handle is connected to the support plate through the connecting rods.

[0012] Optionally, the shell includes an upper cover and a lower shell, the upper cover and the lower shell are detachably connected, the step is arranged on the inner wall of the lower shell, and the support plate and the inner wall of the lower shell are sealed by a sealing ring.

[0013] Optionally, the active oil-gas separator is provided with an oil and gas inlet on the top, an oil return port on the bottom, and a first exhaust port on the side wall; the passive oil-gas separator is provided with an air inlet and a second exhaust port on the side, and the first exhaust port of the active oil-gas separator is connected to the air inlet of the passive oil-gas separator through a connecting pipe.

[0014] Optionally, a centrifugal separation structure is provided in the active oil-gas separator, and the centrifugal separation structure includes centrifugal stacks, a rotating shaft and a driving wheel, the centrifugal stacks are installed on the rotating shaft, and the driving wheel is connected to the rotating shaft. A pressure oil inlet is provided on the side wall of the active oil-gas separator, and the pressure oil inlet faces the driving wheel.

[0015] The embodiment of the utility model further provides an engine, comprising the open cycle breathing device as described above.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] 1. The breathing device of the utility model removes oil droplets and larger particles from the crankcase ventilation gas through an active separator, and filters small particles through a passive oil-gas separator. The combination of two oil-gas separators with different particle removal mechanisms can not only separate oil droplets, but more importantly, effectively remove particles larger than 10nm, which can effectively reduce crankcase PN emissions and significantly improve the filtering performance of crankcase PN emissions, providing a technical solution reserve for PN emissions to meet the requirements of upgraded emission regulations.

[0018] 2. In the utility model, the cooperation of the upper support plate (and the groove), the housing (and the step) and the sealing ring can not only clamp the filter element on the inner wall of the passive oil-gas separator housing but also play a sealing role.

[0019] 3. The utility model ensures that all incoming air can be filtered through the filter medium by sealing the support plate and the inner wall of the shell, and blocking the support tube by the bottom plate.

[0020] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is an overall schematic diagram of an open cycle breathing device provided by an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of a passive oil-gas separator provided by an embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of a filter element provided by an embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the cooperation between the filter element and the housing provided by the embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of an active oil-gas separator provided by an embodiment of the utility model;

[0027] In the figure: 1. active oil-gas separator; 11. oil-gas inlet; 12. first exhaust port; 13. oil return port; 14. centrifugal stack; 15. rotating shaft; 16. driving wheel; 17. pressure oil inlet; 2. passive oil-gas separator; 21. air inlet; 22. second exhaust port; 23. housing; 231. upper cover; 232. lower housing; 24. sealing ring; 25. filter element; 251. grabbing member; 2511. gripping part; 2512. connecting part; 252. supporting frame; 2521. supporting plate; 2522. supporting cylinder; 2523. bottom plate; 253. filter medium layer; 3. connecting pipe;

[0028] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] The crankcase ventilation system is divided into a natural ventilation system (herein referred to as an open crankcase cycle) and a forced ventilation system (herein referred to as a closed crankcase cycle). The principle of the open crankcase cycle is to discharge the crankcase exhaust directly into the atmosphere; the closed crankcase cycle is to introduce the crankcase exhaust into the engine's intake pipe and then burn it in the cylinder. However, for regulatory supervision, when the crankcase is in an open cycle, the crankcase exhaust should be led to the downstream of the post-treatment or emission control device, but upstream of the sampling probe, and fully mixed with the engine exhaust before sampling. Now the PN in the exhaust gas is very low because of DPF filtration, but this small stream of crankcase leakage accounts for a high proportion of PN.

[0031] Emission regulations are increasingly stringent in controlling exhaust pipe emissions. The next generation of emission regulations may expand the PN (the total number of particles in the exhaust gas with a particle size greater than 23nm) measurement range from 23nm to 10nm. Existing oil-gas separators are difficult to filter PN greater than 10nm in crankcase blowby, which easily causes the oil-gas separator to have excessive PN emissions. In order to solve the above technical problems, the utility model proposes an open circulation breathing device, which is mainly aimed at an open ventilation system. On the basis of the existing active oil-gas separator, a passive oil-gas separator is added. Through two PN filtering methods with different mechanisms, it can better filter particles with smaller particle sizes in crankcase blowby, so that PN with a particle size greater than 10nm can be effectively controlled to meet emission regulations.

[0032] like Figure 1 As shown, an open cycle breathing device is proposed in one embodiment of the utility model, comprising: an active oil-gas separator 1 and a passive oil-gas separator 2, wherein the outlet pipe of the active oil-gas separator 1 is connected to the inlet pipe of the passive oil-gas separator 2. Figure 2As shown, the passive oil-gas separator 2 includes a shell 23 and a filter element 25. The inner wall of the shell 23 is provided with a step. The filter element 25 includes a support frame 252 and a filter medium layer 253. The support frame 252 includes a support plate 2521 and a support cylinder 2522. The outer diameter of the support plate 2521 is larger than the outer diameter of the support cylinder 2522. The support plate 2521 is installed on the step of the inner wall of the shell 23, and the outer wall of the support plate 2521 is sealed with the inner wall of the shell 23. The filter medium layer 253 is wound on the support cylinder 2522.

[0033] The breathing device of the utility model removes oil droplets and larger particles from the crankcase ventilation gas through an active separator, and filters small particles through a passive oil-gas separator 2. The combination of two oil-gas separators with different particle removal mechanisms can not only separate oil droplets, but more importantly, effectively remove particles larger than 10nm, which can effectively reduce crankcase PN emissions and significantly improve the filtering performance of crankcase PN emissions, providing a technical solution reserve for PN emissions to meet the requirements of upgraded emission regulations.

[0034] like Figure 2 , Figure 4 As shown, the outer side of the support plate 2521 is provided with a groove, which is an annular groove, the opening of which is away from the axis of the support plate 2521, and a sealing ring 24 is provided in the groove, and the sealing ring 24 is squeezed into the sealing cavity formed by the groove and the inner wall of the housing 23. In the utility model, through the cooperation of the upper support plate 2521 (and the groove), the housing 23 (and the step) and the sealing ring 24, the filter element 25 can be clamped on the inner wall of the housing 23 of the passive oil-gas separator 2 and can also play a sealing role.

[0035] like Figure 3 As shown, the support frame 252 further includes a bottom plate 2523, the support plate 2521 is located at the upper end of the support cylinder 2522, the bottom plate 2523 is located at the lower end of the support cylinder 2522, and the bottom plate 2523 blocks the bottom opening of the support cylinder 2522. The cylinder wall of the support cylinder 2522 is provided with vents, that is, the cylinder wall is a hollow structure, and the vents are arranged radially so that the gas can pass through the support cylinder 2522 and then flow to the filter medium layer 253. The outer diameter of the bottom plate 2523 is greater than the outer diameter of the support cylinder 2522, and the filter medium layer 253 is located between the support plate 2521 and the bottom plate 2523. Through the sealing between the support plate 2521 and the inner wall of the housing 23, and the blocking of the support cylinder 2522 by the bottom plate 2523, it is ensured that all the intake air can be filtered through the filter medium.

[0036] The support frame 252 is used to maintain and support the shape and stability of the filter medium, and materials such as stainless steel or polyethylene can be used; the filter medium layer 253 of the filter element 25 is a structure in which a porous filter medium is wound in multiple layers, and filter materials such as dense stainless steel wire mesh, filter melt-blown material, and filter fiber can be used. The pore size of the filter medium layer ranges from 1 to 30 microns, and the average pore size is 5 to 15 microns. When the oil and gas pass through the filter material, particles of different sizes will be filtered through mechanisms such as interception, inertial impact, and diffusion (nanoscale particles are mainly through diffusion), so that small particles larger than 10nm can be effectively filtered, and the clean gas flows out through the filter medium layer 253, and finally the gas that has been filtered again is discharged into the atmosphere through the outlet pipe of the passive oil and gas separator 2.

[0037] Further, such as Figure 3 As shown, the filter element 25 also includes a gripping member 251, which is arranged on the support plate 2521. The gripping member 251 includes a gripping portion 2511 and a connecting portion 2512, and the connecting portion 2512 is installed on the support plate 2521, and the gripping portion 2511 is arranged on the connecting portion 2512. In this embodiment, the gripping portion 2511 is a handle, and the handle is annular. The connecting portion 2512 is a connecting rod, and there are at least two connecting rods. The handle is connected to the support plate 2521 through the connecting rod. When disassembling, the filter element 25 is taken out of the housing 23 or the filter element 25 is installed in the housing through the annular handle. Of course, it can be understood that the gripping portion 2511 can also be other shapes, such as rectangular or trapezoidal, and the connecting portion 2512 can also be cylindrical.

[0038] The housing 23 includes an upper cover 231 and a lower housing 232, the upper cover 231 and the lower housing 232 are detachably connected, the step is arranged on the inner wall of the lower housing 232, and the support plate 2521 is sealed with the inner wall of the lower housing 232 by a sealing ring 24. The filter element 25 of the passive oil-gas separator 2 is a detachable structure, which can be replaced during vehicle maintenance. The replacement operation is simple, and only needs to unscrew the upper cover 231 of the housing 23, then hold the handle at the upper end of the filter element 25 to pull out the filter element 25, and then install a new filter element 25.

[0039] like Figure 1As shown, the active oil-gas separator 1 is provided with an oil-gas inlet 11 at the top, an oil return port 13 at the bottom, and a first exhaust port 12 at the side wall. The passive oil-gas separator 2 is provided with an air inlet 21, and a second exhaust port 22 at the side. The first exhaust port 12 of the active oil-gas separator 1 is connected to the air inlet 21 of the passive oil-gas separator 2 through a connecting pipe 3. The gas enters from the upper air inlet 21 and is then filtered through the filter element 25. The filter element 25 structure of the porous filter medium used in the passive oil-gas separator 2 can have a good filtering effect on small particles. By combining two oil-gas separators with different particle removal mechanisms, it can not only separate oil droplets, but more importantly, effectively remove particles larger than 10nm.

[0040] The active oil-gas separator 1 in this embodiment can adopt the existing technology. The active oil-gas separator 1 is provided with a centrifugal separation structure, such as Figure 5 As shown, the centrifugal separation structure includes a centrifugal stack 14, a rotating shaft 15 and a driving wheel 16, the centrifugal stack 14 is installed on the rotating shaft 15, the driving wheel 16 is connected to the rotating shaft 15, and a pressure oil inlet 17 is provided on the side wall of the active oil-gas separator 1, and the pressure oil inlet 17 faces the driving wheel 16.

[0041] The crankcase ventilation exhaust enters the active oil-gas separator 1 through the oil-gas inlet 11. The separator is a rotary centrifugal separation structure, such as Figure 5 As shown, it is mainly composed of a driving wheel 16, a rotating shaft 15, a centrifugal disc, a pressure oil inlet 17, and an oil return port 13. The upper end of the rotating shaft 15 is molded and mounted on the active oil-gas separator 1 through an upper bearing, and the lower end of the rotating shaft 15 is also fixed by a bearing. The driving wheel 16 is driven by the oil in the pressure oil inlet 17. The oil is generally taken from the oil channel of the engine body. The pressure oil impacts the driving wheel 16 to rotate, and the centrifugal disc is driven to rotate at high speed through the rotating shaft 15. The oil-gas mixture is separated by centrifugal force, and the oil droplets and larger particles are thrown to the inner wall of the separator housing 23, and flow to the bottom of the separator through the upper part of the driving wheel 16, and then flow back to the body oil pan through the oil return port 13. The separated gas flows out of the active oil-gas separator 1 through the gas channel.

[0042] In the active oil-gas separator 1, the centrifugal force of the rotating disc separates the oil and larger particles (usually larger than 100nm) in the oil and gas, and the gas from which most of the oil droplets and large particles are separated enters the passive oil-gas separator 2 through the connecting pipe 3. The active separator can effectively remove oil droplets and larger particles from the crankcase ventilation gas through the centrifugal principle of the centrifugal disc, but has almost no filtering effect on small particles in the gas. By combining the centrifugal mechanism of the active oil-gas separator 1 and the filter element 25 structure of the porous filter medium of the passive oil-gas separator 2, the implementation method is simple, and the effect of effectively reducing particles larger than 10nm is achieved, which significantly improves the filtering performance of crankcase PN emissions. The technical principle of this solution is simple, but it can effectively improve the filtration efficiency of crankcase PN and is easy to promote and apply.

[0043] Based on the above-mentioned open-circulation breathing device, an embodiment of the utility model further provides an engine, in which the open-circulation breathing device described in the above-mentioned embodiment is provided. Since the above-mentioned open-circulation breathing device has the above-mentioned technical effects, the technical effects of the engine using the open-circulation breathing device please refer to the above-mentioned embodiment.

[0044] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An open cycle breathing apparatus, characterized in that: include: An active oil-gas separator and a passive oil-gas separator, wherein the outlet pipe of the active oil-gas separator is connected to the inlet pipe of the passive oil-gas separator; The passive oil-gas separator includes a shell and a filter element. The inner wall of the shell is provided with a step. The filter element includes a support frame and a filter medium layer. The support frame includes a support plate and a support cylinder. The outer diameter of the support plate is larger than the outer diameter of the support cylinder. The support plate is installed on the step of the inner wall of the shell, and the outer wall of the support plate is sealed with the inner wall of the shell. The filter medium layer is wound on the support cylinder.

2. The open circuit breathing apparatus according to claim 1, characterized in that: The outer side of the support plate is provided with a groove, which is an annular groove with an opening facing away from the axis of the support plate. A sealing ring is provided in the groove and is squeezed into a sealing cavity formed by the groove and the inner wall of the shell.

3. The open circuit breathing apparatus according to claim 1, wherein: The support frame also includes a bottom plate, which is located at the upper end of the support tube, and the bottom plate is located at the lower end of the support tube, and the bottom plate blocks the bottom opening of the support tube.

4. The open circuit breathing apparatus according to claim 3, wherein: The support tube wall is provided with ventilation holes, which are arranged radially. The outer diameter of the bottom plate is larger than the outer diameter of the support tube, and the filter medium layer is located between the support plate and the bottom plate.

5. The open circuit breathing apparatus according to claim 1, wherein: The filter element further comprises a gripping member, which is arranged on the support plate. The gripping member comprises a gripping portion and a connecting portion, the connecting portion is mounted on the support plate, and the gripping portion is arranged on the connecting portion.

6. The open circuit breathing apparatus according to claim 5, characterized in that: The holding portion is a handle, the handle is annular, the connecting portion is a connecting rod, there are at least two connecting rods, and the handle is connected to the support plate through the connecting rod.

7. The open circuit breathing apparatus according to claim 2, wherein: The shell comprises an upper cover and a lower shell, the upper cover and the lower shell are detachably connected, the step is arranged on the inner wall of the lower shell, and the support plate and the inner wall of the lower shell are sealed by a sealing ring.

8. The open circuit breathing apparatus according to claim 1, wherein: The active oil-gas separator is provided with an oil and gas inlet on the top, an oil return port on the bottom, and a first exhaust port on the side wall; the passive oil-gas separator is provided with an air inlet on the top, and a second exhaust port on the side, and the first exhaust port of the active oil-gas separator is connected with the air inlet of the passive oil-gas separator through a connecting pipe.

9. The open circuit breathing apparatus according to claim 8, wherein: A centrifugal separation structure is arranged in the active oil-gas separator, and the centrifugal separation structure includes a centrifugal stack, a rotating shaft and a driving wheel. The centrifugal stack is installed on the rotating shaft, and the driving wheel is connected to the rotating shaft. A pressure oil inlet is arranged on the side wall of the active oil-gas separator, and the pressure oil inlet faces the driving wheel.

10. An engine, characterized in that: The invention comprises an open circuit breathing apparatus as claimed in any one of claims 1 to 9.

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