Oil-gas separator and engine

Abstract

The utility model discloses an oil-gas separator which comprises a gas inlet pipe, a flow guide pipe, a cavity structure and a gas outlet pipe which are sequentially connected. The height of an air inlet of the air inlet pipe is lower than that of an air outlet of the air outlet pipe, the flow guide pipe is of a variable cross-section pipe structure, the cavity structure is of a square shell structure, an oil outlet is formed in the bottom of the cavity structure, and the air inlet pipe, the flow guide pipe, the cavity structure and the air outlet pipe which are connected are integrally in a U shape. According to the oil-gas separator, the whole oil-gas separator is U-shaped, the height of the gas inlet is lower than that of the gas outlet, and by means of the height difference formed between the gas inlet and the gas outlet, large-particle engine oil is filtered through gravity in the flowing process of oil-gas mixed gas; the oil-gas mixture forms a vortex in the vertical direction in the cavity structure, the centrifugal force of the vortex can strengthen the gravity, and the separation effect is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-gas separation devices for engines, and particularly relates to an oil-gas separator and an engine. Background Art

[0002] The statements herein only provide background art related to the utility model and do not necessarily constitute prior art.

[0003] When the engine is running, a large amount of oil is carried when the gas discharged due to the sealing gap of the piston ring is discharged outside the engine. An oil-gas separator is a device for separating the oil in the exhaust gas.

[0004] Oil-gas separators mainly include active centrifugal oil-gas separators, volumetric oil-gas separators, cyclone oil-gas separators, baffle oil-gas separators, and filter oil-gas separators. Among them, the working principle of the active centrifugal oil-gas separator is to form a rotating eddy current in the separator by relying on externally input energy, and the particles in the mixed gas flow are separated under the action of centrifugal force; the working principle of the volumetric oil-gas separator is that the oil droplets are slowly condensed and settled from the mixed gas under the action of their own gravity and are separated; the working principle of the cyclone oil-gas separator is to let the gas-liquid mixture enter the separator through a tangential inlet channel or a spiral inlet channel, so that the mixture rotates in the separator to generate centrifugal force to achieve the separation of oil droplets. Its separation mechanism is the same as that of the active centrifugal oil-gas separator, but it does not require external power supply; the working principle of the baffle oil-gas separator is to arrange cross baffles in the flow direction of the air flow to block the mixed gas, and at the same time effectively increase the flow path and forcibly change the flow direction of the air flow, so that the oil droplets are separated from the mixed gas under the action of inertial impact; the separation principle of the filter oil-gas separator is to let the mixed gas flow through the filter material, and the oil droplets adhere to the filter device while the gas can pass through smoothly.

[0005] Since the above single-type oil-gas separators all have certain disadvantages: the manufacturing and use costs of the active centrifugal oil-gas separator are relatively high; the separation efficiency of the volumetric oil-gas separator is very low, and the size of the gravity settling chamber required is relatively large; the baffle oil-gas separator will generate a large pressure drop; the regeneration performance of the filter material used in the filter oil-gas separator is very poor and the service life is not long. Therefore, there are many combined oil-gas separator structures. For example, Chinese Utility Model Patent CN204646363U discloses an oil-gas separator and an engine, in which a spiral passage is provided in the main body of the oil-gas separator to guide the flow path of the oil and gas. It can be seen that the above combined oil-gas separator has the problem of complex structure, which is not convenient for later cleaning and maintenance; in addition, the flow path of the oil and gas in the above oil-gas separator is relatively single, resulting in poor oil-gas separation effect. Summary of the Utility Model

[0006] The object of the present utility model is to provide an oil-gas separator. By means of the height difference formed between the air inlet and the air outlet, large-particle engine oil is filtered by gravity. Meanwhile, the container type and the centrifugal type are combined, and the centrifugal force is used to strengthen the gravity, thereby enhancing the separation effect.

[0007] In order to achieve the above object, the present utility model is realized by the following technical solutions:

[0008] In a first aspect, an embodiment of the present utility model provides an oil-gas separator, which includes an air inlet pipe, a diversion pipe, a cavity structure and an air outlet pipe connected in sequence; the height of the air inlet of the air inlet pipe is lower than the height of the air outlet of the air outlet pipe, the diversion pipe is a variable cross-section pipe structure, the cavity structure adopts a square shell structure, an oil outlet is arranged at the bottom of the cavity structure, and the connected air inlet pipe, diversion pipe, cavity structure and air outlet pipe are integrally in a U shape.

[0009] As a further technical solution, the air inlet pipe is arranged vertically, the diversion pipe is arranged horizontally, and one end of the diversion pipe is connected to the air inlet pipe and is perpendicular to the air inlet pipe.

[0010] As a further technical solution, one end of the diversion pipe is an equal cross-section pipe fitting, and the other end is a variable cross-section pipe fitting, wherein the equal cross-section pipe fitting is connected to the air inlet pipe, and the variable cross-section pipe fitting is connected to the lower part of the cavity structure.

[0011] As a further technical solution, the cross-section of the equal cross-section pipe fitting is the same as the cross-section of the air inlet pipe.

[0012] As a further technical solution, the cross-section of the variable cross-section pipe fitting gradually increases along the air flow direction, and the cross-section at the position where the variable cross-section pipe fitting is connected to the cavity structure is the largest.

[0013] As a further technical solution, the air outlet pipe is arranged vertically, and the air outlet pipe is connected to the upper surface of the cavity structure.

[0014] As a further technical solution, the heights of the air inlet pipe, the air outlet pipe and the cavity structure are the same.

[0015] As a further technical solution, the air inlet of the air inlet pipe is bent at a 90° angle.

[0016] As a further technical solution, the air inlet pipe, the diversion pipe, the cavity structure and the air outlet pipe adopt an integrally formed structure.

[0017] In a second aspect, an embodiment of the present utility model provides an engine, which includes the oil-gas separator described in the first aspect.

[0018] The beneficial effects of the above embodiments of the present utility model are as follows:

[0019] The oil-gas separator provided by the present utility model is integrally U-shaped, and the height of the air inlet is lower than that of the air outlet. By utilizing the height difference formed between the air inlet and the air outlet, large-particle engine oil is filtered by gravity during the flow of the oil-gas mixture; the oil-gas mixture forms a vortex in the vertical direction in the cavity structure, and the centrifugal force of the vortex can strengthen the gravity and enhance the separation effect.

[0020] The oil-gas separator provided by the present utility model sets the cavity structure as a square structure. On the one hand, it can make the incoming oil-gas mixture form a vortex in the vertical direction, enhancing the separation effect. On the other hand, it can effectively increase the surface area of the separation wall surface without affecting the rotation. Therefore, while separating by centrifugal force, the contact area between the gas and the wall surface is increased, enhancing the separation effect.

[0021] Before the oil-gas mixture enters the cavity structure in the oil-gas separator provided by the present utility model, through the variable cross-section effect of the diversion pipe, the incoming width of the cavity structure is increased, the air flow is changed into a strip shape, and the air flow becomes flat, which is beneficial to the contact between the oil-gas mixer and the wall surface of the cavity structure. At the same time, it can avoid the interference of the outer air flow on the inner air flow, which is beneficial to strengthening the separation effect.

[0022] The oil-gas separator provided by the present utility model has a simple structure and does not require various baffles, filters, and operating structural parts; at the same time, it can also be flexibly arranged. Each structural part can be designed separately or integrated inside other castings according to the requirements of the overall machine layout; due to the simple structure, the cost is relatively low. Description of the Drawings

[0023] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] Figure 1 is the three-dimensional perspective view of the oil-gas separator of the present utility model;

[0025] Figure 2 is the front view of the oil-gas separator of the present utility model;

[0026] Figure 3 is the side view of the oil-gas separator of the present utility model;

[0027] Figure 4 is the top view of the oil-gas separator of the present utility model.

[0028] The schematic diagram is only for illustration;

[0029] Among them, 1. intake pipe; 101. air inlet; 2. diversion pipe; 201. constant cross-section pipe fitting; 202. variable cross-section pipe fitting; 3. cavity structure; 4. outlet pipe; 401. air outlet. Detailed implementation mode

[0030] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0031] Embodiment 1

[0032] In a typical implementation mode of the present invention, as Figures 1 - 4 shown, an oil-gas separator is provided, which includes an intake pipe 1, a diversion pipe 2, a cavity structure 3, and an outlet pipe 4 connected in sequence; the height of the air inlet 101 of the intake pipe 1 is lower than the height of the air outlet 401 of the outlet pipe 4, the diversion pipe 2 is a variable cross-section pipe structure, the cavity structure 3 adopts a square shell structure, and an oil outlet is provided at the bottom of the cavity structure 3. The connected intake pipe 1, diversion pipe 2, cavity structure 3, and outlet pipe 4 are integrally U-shaped.

[0033] In this embodiment, the intake pipe 1 is arranged vertically, the diversion pipe 2 is arranged horizontally, and one end of the diversion pipe 2 is connected to the intake pipe 1 and is perpendicular to the intake pipe 1; further, the outlet pipe 4 is arranged vertically, and the outlet pipe 4 is connected to the upper surface of the cavity structure 3. Through the above setting method, the oil-gas mixture descends first and then rises after entering, and by appropriately increasing the height difference of the oil content in the outlet gas, large particle oil is filtered by gravity.

[0034] Further, the outlet pipe 4 is connected to one side of the upper surface of the cavity structure 3 close to the intake pipe 1, which is beneficial to increasing the gas path and improving the separation effect.

[0035] In this embodiment, one end of the diversion pipe 2 is a constant cross-section pipe fitting 201, and the other end is a variable cross-section pipe fitting 202. Among them, the constant cross-section pipe fitting 201 is connected to the intake pipe 1, and the variable cross-section pipe fitting 202 is connected to the lower part of the cavity structure 3. Among them, the cross-section of the constant cross-section pipe fitting 201 is the same as the cross-section of the intake pipe 1, and the cross-section of the variable cross-section pipe fitting 202 gradually increases along the gas flow direction, and the cross-section at the position where the variable cross-section pipe fitting is connected to the cavity structure is the largest.

[0036] In a specific implementation mode of this embodiment, the heights of the intake pipe 1, the outlet pipe 4, and the cavity structure 3 are all the same.

[0037] In this embodiment, the air inlet of the intake pipe 1 is bent at a 90° angle to facilitate the connection of the oil-gas separator to other components.

[0038] In this embodiment, the intake pipe 1, the diversion pipe 2, the cavity structure 3 and the outlet pipe 4 adopt an integrally formed structure, which eliminates the need for pipeline connection and can avoid leakage at the pipeline connection.

[0039] The working principle of the oil-gas separator provided in this embodiment is as follows:

[0040] The air flow direction between the air inlet 101 and the air outlet 401 of the oil-gas separator is first downward and then upward, appropriately increasing the height difference of the oil-containing gas outlet, and using gravity to filter large-particle engine oil; a cavity structure is set at the low point of the gas path, the inlet is located at the bottom of the cavity structure 3, the outlet is located at the top of the cavity on the same side as the inlet, a diversion pipe is set at the inlet to guide the air flow path inside the cavity to be the largest, the air flow path runs along the outer wall of the cavity, and the path is approximately circular in the vertical direction ( Figure 4 as shown by the arrow in the figure), with a relatively fast flow rate, using centrifugal force to separate engine oil particles. Because the cavity is relatively large, the air flow velocity is high on the outside and low on the inside; in the low-speed area inside, the engine oil particles settle naturally; the closer to the outer wall of the cavity, the higher the flow rate and the greater the centrifugal force. Using the hierarchical centrifugal force, the oil droplets continuously move outward and fuse to form large oil droplets, and finally collide with the outer wall of the cavity and are separated from the gas. The separated liquid is discharged from the oil outlet at the bottom of the cavity (the oil outlet is not shown in the figure).

[0041] For the oil-gas separator provided in this embodiment, by setting the cavity structure as a square shell structure, and the air flow inlet of the cavity structure is located at the bottom and the air flow outlet is located at the top, a vortex is formed in the vertical plane of the air flow. At the same time, the gas is affected by gravity during the upward movement and is strengthened by centrifugal force, enhancing the sedimentation effect; in addition, after some engine oil particles carried in the gas come into contact with the wall surface of the cavity structure, under the action of friction, the oil droplets lose the kinetic energy of moving with the gas, thereby achieving the separation effect. Compared with the existing cylindrical separator, the square shell structure of this embodiment can increase the inner cavity surface area, thereby increasing the separation effect.

[0042] In addition, before the oil-gas mixture enters the cavity structure, through the variable cross-section effect of the diversion pipe, the intake width of the air flow entering the cavity structure is increased, the air flow is changed into a strip shape, and the air flow is flattened, which is beneficial to the contact between the oil-gas mixer and the wall surface of the cavity structure, and at the same time can avoid the interference of the outer air flow on the inner air flow, which is beneficial to strengthening the separation effect.

[0043] Embodiment 2

[0044] In a typical implementation manner of the present invention, an engine is provided, including the oil-gas separator as described in Embodiment 1.

[0045] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An oil-gas separator, characterized in that: It includes an air intake pipe, a guide pipe, a cavity structure and an air outlet pipe which are connected in sequence; the height of the air inlet of the air intake pipe is lower than the height of the air outlet of the air outlet pipe, the guide pipe is a variable cross-section pipe structure, the cavity structure adopts a square shell structure, and an oil outlet is arranged at the bottom of the cavity structure. The connected air intake pipe, guide pipe, cavity structure and air outlet pipe are U-shaped as a whole.

2. The oil-gas separator according to claim 1, characterized in that: The air intake pipe is arranged vertically, the air guide pipe is arranged horizontally, and one end of the air guide pipe is connected to the air intake pipe and is perpendicular to the air intake pipe.

3. The oil-gas separator according to claim 2, characterized in that: One end of the guide pipe is a pipe with a constant cross section, and the other end is a pipe with a variable cross section, wherein the pipe with a constant cross section is connected to the air inlet pipe, and the pipe with a variable cross section is connected to the lower part of the cavity structure.

4. The oil-gas separator according to claim 3, characterized in that: The cross section of the uniform cross section pipe is the same as the cross section of the air intake pipe.

5. The oil-gas separator according to claim 3, characterized in that: The cross-section of the variable-cross-section pipe gradually increases along the airflow direction, and the cross-section is largest at the position where the variable-cross-section pipe is connected to the cavity structure.

6. The oil-gas separator according to claim 1, characterized in that: The air outlet pipe is vertically arranged and connected to the upper surface of the cavity structure.

7. The oil-gas separator according to claim 1, characterized in that: The air inlet pipe, the air outlet pipe and the cavity structure have the same height.

8. The oil-gas separator according to claim 1, characterized in that: The air inlet of the air inlet pipe is bent at an angle of 90°.

9. The oil-gas separator according to claim 1, characterized in that: The air inlet pipe, the guide pipe, the cavity structure and the air outlet pipe are integrally formed.

10. An engine, characterized in that: Comprising the oil-gas separator as described in any one of claims 1-9.

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