A breathing apparatus oil return device, breathing apparatus and engine

Abstract

The utility model belongs to the technical field of engine, disclose a kind of breather oil return device, breather and engine, including the oil return pipe of being installed at the bottom end of breather, the bottom end of oil return pipe is fixedly connected in oil cup;The bottom end of oil return pipe is inclined and cuts eccentric structure, and the bottom end of inclined and cuts eccentric structure is contacted with the bottom inner wall of oil cup;Inclined and cuts eccentric structure refers to the inclined and cuts opening formed by the bottom end of oil return pipe with non-perpendicular axis direction cutting;Oil cup's sidewall top is equipped with oil overflow port, and the opening of inclined and cuts eccentric structure is set back to oil overflow port.This utility model is contacted by setting inclined and cuts eccentric structure with oil cup bottom in the bottom end of oil return pipe, eliminates installation positioning requirement, in addition, oil liquid flows down along the pipe wall of inclined and cuts eccentric structure, directly spreads in the bottom inner wall of oil cup, and oil return continuity is strong and can accelerate bubble to escape;Inclined and cuts opening is arranged back to oil overflow port, reduces the impact of the air flow entering oil cup through oil overflow port to oil liquid backflow, improves oil return stability.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, specifically relating to a breather oil return device, a breather, and an engine. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] A breather is an oil-gas filtration device for an engine crankcase. Its main function is to expel high-temperature, high-pressure gases from the engine crankcase, maintain stable pressure inside the crankcase, and separate engine oil from the oil-gas, reducing oil consumption and leakage.

[0004] Existing breather oil return devices mainly involve installing a one-way valve oil return structure on the breather's oil return pipe and inserting the oil return pipe below the oil level to prevent oil vapor from being directly discharged into the atmosphere without separation. This traditional arrangement is not only inconvenient to implement, but also requires the purchase of one-way valve structures, resulting in higher costs.

[0005] To solve the above-mentioned technical problems, the prior art discloses a return oil structure for diesel engine oil-gas separation, including an oil cup, a return oil pipe, and a cover plate. The lower end of the return oil pipe is set inside the oil cup, and the lower end of the return oil pipe is a certain distance away from the bottom of the oil cup. The cover plate is set on the top of the return oil pipe, and the cover plate has an oil storage tank. The return oil pipe is connected to the bottom of the oil storage tank. Oil can flow from the oil storage tank to the oil cup along the return oil pipe. When the oil cup is full of oil, the oil overflows from the oil cup.

[0006] While the above solution addresses the problems of inconvenient and costly traditional return oil pipe layout, it still has the following drawbacks: The lower end of the oil return pipe and the bottom of the oil cup in the above scheme need to maintain a precise distance. During processing, the positions of the oil return pipe and the oil cup need to be accurately positioned before they can be connected, which requires high processing and assembly precision. During operation, the separated oil condenses into large droplets at the lower end of the oil return pipe before dripping down. The separated oil usually contains high-density microbubbles, which affect the condensation process of the oil at the lower end of the oil return pipe, resulting in discontinuous oil return. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a breather oil return device, a breather and an engine. The breather oil return device can solve the technical problem in the background art of maintaining a precise distance between the lower end of the oil return pipe and the bottom of the oil cup, which leads to high processing and assembly accuracy, but also results in discontinuous oil return.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: In the first aspect, the respirator oil return device disclosed in this embodiment includes an oil return pipe installed at the bottom of the respirator, the bottom end of which is fixedly connected to the oil cup; the bottom end of the oil return pipe has a beveled structure, and the bottom end of the beveled structure contacts the bottom inner wall of the oil cup. The oblique cut structure refers to the oblique cut opening formed by cutting the bottom end of the return oil pipe in a direction that is not perpendicular to the axis. An oil overflow port is provided on the top of the side wall of the oil cup, and the opening of the obliquely cut structure is set away from the oil overflow port.

[0009] Preferably, the oil cup is a hollow cylindrical body, and the inner wall surface of the oil cup is a continuous smooth curved surface.

[0010] Preferably, the bottom axis of the return oil pipe intersects perpendicularly with the axis of the oil cup, and the oblique cut structure is located at the center of the axis of the oil cup.

[0011] Preferably, the oblique cut opening ratio of the oblique cut structure is in the range of 0.5-1. The oblique cut opening ratio refers to the ratio of the height of the oblique surface to the horizontal projection length of the oblique surface.

[0012] Preferably, from the bottom of the respirator, the return oil pipe includes an upper return pipe, a connecting pipe, and a lower return pipe connected in sequence from top to bottom. The upper return pipe is a multi-section bend pipe, the connecting pipe is a single-section bend pipe, and the lower return pipe is a straight pipe.

[0013] Preferably, the inner and outer diameters of the upper and lower return pipes are the same, the inner diameter of the connecting pipe is equal to the outer diameter of the upper and lower return pipes, and the bottom end of the upper return pipe and the top end of the lower return pipe are inserted into the connecting pipe for a set length and then welded and sealed with the connecting pipe.

[0014] Preferably, a flange is fixedly connected to the outer periphery of the oil cup near the overflow port, and the flange is fixedly connected to the outside of the engine.

[0015] Secondly, a respirator is provided, including the aforementioned respirator oil return device, wherein a gas separation pipe and an oil separation pipe are fixedly connected to the respirator, and the oil separation pipe is fixedly connected to the upper return pipe of the respirator oil return device.

[0016] Preferably, the gas separator pipe is equipped with multiple clamps, which are connected to the upper return pipe or flange of the respirator oil return device.

[0017] Thirdly, an engine is provided, including the aforementioned respirator.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are: This invention relates to a breather oil return device. By setting a beveled off-center structure at the bottom of the oil return pipe to contact the bottom of the oil cup, the distance between the oil return pipe and the oil cup does not need to be controlled during processing, eliminating the installation positioning requirements and allowing for quick positioning and installation of the oil return pipe and the oil cup. In addition, the oil flows down the pipe wall of the beveled off-center structure and spreads directly on the bottom inner wall of the oil cup, avoiding the process of oil accumulating in the air below the lower end of the oil return pipe as in the prior art. The oil return is highly continuous, and the continuous oil film flow generated by the beveled off-center structure can accelerate the dissipation of air bubbles. In this invention, the beveled opening of the beveled off-center structure is arranged opposite to the overflow port. After the high-pressure airflow in the cylinder enters the oil cup through the overflow port, the airflow path and the oil return path of the beveled off-center structure are spatially misaligned, reducing the direct impact of the airflow on the oil return and effectively avoiding the influence of air pressure fluctuations. This ensures continuous and stable oil return, and has the advantages of simplified structure, reduced assembly difficulty, and improved oil return stability and reliability. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a schematic diagram of the structure of a respirator oil return device according to Embodiment 1 or Embodiment 2 of this utility model; Figure 2 This is a cross-sectional schematic diagram of the oil cup in Embodiment 1 of this utility model; In the picture: 1. Breathing apparatus; 11. Gas separator pipe; 12. Oil separator pipe; 13. Breathing apparatus support; 14. Clamp; 2. Oil return pipe; 21. Upper return pipe; 22. Connecting pipe; 23. Lower return pipe; 24. Oblique cut structure; 3. Oil cup; 31. Overflow port; 32. Flange. Detailed Implementation

[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] Example 1 This embodiment discloses a respirator oil return device, such as Figure 1 , Figure 2As shown, the device includes an oil return pipe 2 installed at the bottom of the respirator 1, with the bottom end of the oil return pipe 2 fixedly connected to the oil cup 3; the bottom end of the oil return pipe 2 is a beveled opening structure 24, and the bottom end of the beveled opening structure 24 contacts the bottom inner wall of the oil cup 3; in this embodiment, the beveled opening structure 24 refers to the beveled opening formed by cutting the bottom end of the oil return pipe 2 in a direction that is not perpendicular to the axis.

[0024] It should be noted that after the oil enters the return oil pipe 2 from the breather 1, it eventually flows into the oil cup 3 from the obliquely cut end structure 24 at the bottom of the return oil pipe 2 under the action of gravity. In this embodiment, the bottom end of the obliquely cut end structure 24 is in contact with the bottom inner wall of the oil cup 3. The oil flows down the pipe wall of the obliquely cut end structure 24 and spreads directly on the bottom inner wall of the oil cup 3, avoiding the process of oil accumulating in the air below the lower end of the return oil pipe as in the prior art. In addition, the continuous oil film flow generated by the oil in the obliquely cut end structure 24 can accelerate the dissipation of air bubbles.

[0025] It should also be noted that in this embodiment, the bottom end of the oil return pipe 2 directly contacts the inner wall of the bottom surface of the oil cup 3. During processing, a through hole corresponding to the diameter of the oil return pipe 2 is opened at the top of the oil cup 3. The bottom end of the oil return pipe 2 is inserted into the oil cup 3 and contacts the inner wall of the bottom surface of the oil cup 3. Then, the oil return pipe 2 and the oil cup 3 are welded and fixed. Compared with the prior art, which requires maintaining the distance between the end of the oil return pipe and the bottom surface of the oil cup, this embodiment provides a beveled off-center structure 24 at the bottom end of the oil return pipe 2. The bottom end of the beveled off-center structure 24 contacts the bottom surface of the oil cup. During processing, there is no need to control the distance between the oil return pipe 2 and the oil cup 3, eliminating the installation positioning requirements and allowing for quick positioning and installation of the oil return pipe 2 and the oil cup 3.

[0026] like Figure 2 As shown, an overflow port 31 is provided on the top of the side wall of the oil cup 3, and the opening of the obliquely cut off-center structure 24 is set away from the overflow port 31. The function of setting the overflow port 31 is that when the oil level in the oil cup 3 reaches the height of the overflow port 31, the oil flows out of the oil cup 3 through the overflow port 31. The function of the obliquely cut off-center structure 24 being set away from the overflow port 31 is that after the high-pressure airflow in the cylinder enters the oil cup 3 through the overflow port 31, the airflow path and the oil return path of the obliquely cut off-center structure 24 are spatially misaligned, reducing the direct impact of the airflow on the oil return.

[0027] Understandably, compared to existing technologies that require maintaining a distance between the end of the return pipe and the bottom of the oil cup, this embodiment eliminates the installation positioning requirement by having the bottom of the obliquely cut off-center structure 24 contact the bottom of the oil cup. Unlike existing technologies where oil accumulates at the flat end of the return pipe and then falls, this embodiment guides the formation of a continuous oil flow through the obliquely cut off-center structure 24, effectively shortening the bubble retention time. Furthermore, the opening of the obliquely cut off-center structure 24 in this embodiment is positioned away from the overflow port 31, effectively isolating the high-pressure airflow path and ensuring that the oil return process is not disturbed by pressure fluctuations, thus maintaining stable oil return operation.

[0028] like Figure 1 , Figure 2 As shown, in this embodiment, the oil cup 3 is a hollow cylindrical body. In this embodiment, a hollow cylindrical body refers to a cylindrical structure with uniform wall thickness and a continuous internal cavity. Specifically, it can be achieved by metal stamping. Its axial symmetry characteristic eliminates the need for complex positioning references during processing; assembly and positioning can be completed through a single axis. Furthermore, the inner wall surface of the oil cup 3 is a continuous smooth curved surface, eliminating abrupt changes in the oil flow path and preventing the generation of local eddies.

[0029] like Figure 2 As shown, the bottom axis of the oil return pipe 2 intersects perpendicularly with the axis of the oil cup 3, and the oblique cut structure 24 is located at the center of the oil cup's axis. The ingenuity of this design lies in... Figure 2 As shown, the oblique cut structure 24 at the bottom of the return oil pipe 2 contacts the lowest end of the oil cup 3. When the oil flows to the lowest end of the oil cup 3, the oil level can rise rapidly under the action of the arc surface of the inner wall at the bottom of the oil cup 3, and then submerge the oblique cut structure 24, ensuring that the oil flows back stably into the oil cup 3.

[0030] Compared to the existing technology with a flat-mouth design at the lower end of the suspended oil return pipe and a racetrack-shaped oil cup structure, the oil cup 3 in this embodiment is a hollow cylindrical body. The bottom axis of the oil return pipe 2 intersects perpendicularly with the axis of the oil cup 3, and the oblique cut structure 24 is located at the center of the axis of the oil cup. This allows the oil to flow into the oil cup 3 quickly and the liquid level in the oil cup 3 to rise rapidly and submerge the oblique cut structure 24, ensuring that the oil flows back into the oil cup 3 stably.

[0031] In addition, during the assembly process, when the oblique cut structure 24 of the return oil pipe 2 contacts the inner wall of the cylindrical body of the oil cup 3, the uniform fitting gap is formed because the curvature of each point in the circumference of the cylindrical body is consistent. After the oil enters the oil cup 3 of the cylindrical body, it is evenly distributed along the axial direction under the action of gravity. Its continuous and smooth inner surface eliminates the abrupt change point of flow resistance, which promotes the formation of a stable laminar flow state of the oil containing air bubbles. Compared to the existing racetrack-shaped oil cup structure, the geometric symmetry of the cylindrical body of this invention simplifies the processing and positioning steps, while the continuous smooth inner wall surface maintains the stability of oil flow.

[0032] In this embodiment, the oblique opening ratio of the oblique-cut structure 24 is in the range of 0.5-1. The oblique opening ratio refers to the ratio of the height of the oblique surface to the horizontal projection length of the oblique surface. The oblique opening ratio is designed to be in the range of 0.5-1, which allows the oil to form a uniform flow path along the pipe wall under the action of gravity. When the oil flows through the oblique-cut structure 24, the surface tension is balanced, and the tiny air bubbles are carried away from the pipe opening with the flow of oil, avoiding accumulation and retention at the pipe opening.

[0033] like Figure 1 As shown, in this embodiment, from the bottom of the respirator 1 down, the return oil pipe 2 includes an upper return pipe 21, a connecting pipe 22, and a lower return pipe 23 connected in sequence. The upper return pipe 21 is a multi-section bend pipe, the connecting pipe 22 is a single-section bend pipe, and the lower return pipe 23 is a straight pipe.

[0034] In this embodiment, the upper return pipe 21 refers to the pipe segment connected to the breather 1. Since the breather 1 and the oil return device (including the oil return pipe and oil cup) are installed outside the engine, in order to avoid interference with the engine and to connect the breather 1 to the oil cup 3, the upper return pipe 21 adopts a multi-segment bent pipe structure to receive the oil separated by the breather and form a continuous flow path. It should be noted that the oil return pipe 2 is divided into three independent structures: the upper return pipe 21, the connecting pipe 22, and the lower return pipe 23. Each pipe segment can be individually processed and assembled. The bending angle of the upper return pipe 21 can be adjusted according to the installation position of the breather 1.

[0035] In this embodiment, the lower return pipe 23 refers to the pipe section directly connected to the oil cup 3. Using a straight pipe structure ensures that the axis of the bottom end of the return pipe 2 intersects perpendicularly with the axis of the oil cup 3 and is located at the center of the oil cup, allowing oil to be directly introduced to the bottom of the oil cup. The connecting pipe 22 refers to the transition pipe section between the upper return pipe 21 and the lower return pipe 23. To ensure the connection between the upper return pipe 21 and the lower return pipe 23, the connecting pipe 22 is designed as a single-section bent pipe, achieving segmented connection and adjusting the spatial orientation. In this embodiment, the inner and outer diameters of the upper return pipe 21 and the lower return pipe 23 are the same, and the inner diameter of the connecting pipe 22 is equal to the outer diameter of the upper return pipe 21 and the lower return pipe 23. The bottom end of the upper return pipe 21 and the top end of the lower return pipe 23 are inserted into the connecting pipe 22 for a set length (8mm in this embodiment) and then welded to the connecting pipe 22 for sealing. This design facilitates the connection between the upper return pipe 21 and the lower return pipe 23 and avoids the possibility of the upper return pipe 21 and the lower return pipe 23 breaking under long-term vibration after being directly connected. In addition, the connecting pipe 22, as an intermediate transition section, allows for a certain positional deviation between the upper return pipe 21 and the lower return pipe 23 during assembly without affecting the sealing performance.

[0036] In this embodiment, a flange 32 is fixedly connected to one end of the outer periphery of the oil cup 3 near the overflow port 31. The flange 32 is fixedly connected to the outside of the engine to fix the oil cup 3 to the outside of the engine.

[0037] Example 2 This embodiment discloses a respirator, such as Figure 1As shown, this includes a breather oil return device disclosed in Embodiment 1. A gas separator pipe 11 and an oil separator pipe 12 are fixedly connected to the breather 1. The upper return pipe 21 of the oil return pipe 2 is fixedly connected to the oil separator pipe 12 (e.g., by welding). Multiple clamps 14 are installed on the gas separator pipe 11, which are used to connect the gas separator pipe 11 to the upper return pipe 21 or a flange 32 (e.g., by bolting). The breather 1 is fixedly connected to the engine via a breather bracket 13 (e.g., by bolting).

[0038] Example 3 This embodiment discloses an engine, including a respirator disclosed in Embodiment 2.

[0039] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A respirator oil return device, characterized in that, It includes an oil return pipe installed at the bottom of the respirator, the bottom end of which is fixedly connected to the oil cup; the bottom end of the oil return pipe has a beveled structure, and the bottom end of the beveled structure contacts the bottom inner wall of the oil cup. The oblique cut structure refers to the oblique cut opening formed by cutting the bottom end of the return oil pipe in a direction that is not perpendicular to the axis. An oil overflow port is provided at the top of the side wall of the oil cup, and the opening of the oblique cut structure is positioned opposite to the oil overflow port.

2. The respirator oil return device as described in claim 1, characterized in that, The oil cup is a hollow cylinder, and the inner wall of the oil cup is a continuous smooth curved surface.

3. The respirator oil return device as described in claim 2, characterized in that, The bottom axis of the return oil pipe intersects perpendicularly with the axis of the oil cup, and the oblique cut structure is located at the center of the axis of the oil cup.

4. The respirator oil return device as described in claim 1, characterized in that, The oblique cut opening ratio of the oblique cut structure is in the range of 0.5-1. The oblique cut opening ratio refers to the ratio of the height of the oblique surface to the horizontal projection length of the oblique surface.

5. The respirator oil return device as described in claim 1, characterized in that, From the bottom of the respirator, the return oil pipe includes an upper return pipe, a connecting pipe, and a lower return pipe connected in sequence. The upper return pipe is a multi-section bend pipe, the connecting pipe is a single-section bend pipe, and the lower return pipe is a straight pipe.

6. The respirator oil return device as described in claim 5, characterized in that, The inner and outer diameters of the upper return pipe and the lower return pipe are the same. The inner diameter of the connecting pipe is equal to the outer diameter of the upper return pipe and the lower return pipe. The bottom end of the upper return pipe and the top end of the lower return pipe are inserted into the connecting pipe for a set length and then welded and sealed with the connecting pipe.

7. The respirator oil return device as described in claim 1, characterized in that, A flange is fixedly connected to the outer periphery of the oil cup near the overflow port, and the flange is fixedly connected to the outside of the engine.

8. A respirator, characterized in that, The device includes a respirator oil return device as described in any one of claims 1-7, wherein a gas separation pipe and an oil separation pipe are fixedly connected to the respirator, and the oil separation pipe is fixedly connected to the upper return pipe of the respirator oil return device.

9. A respirator as described in claim 8, characterized in that, The gas separator pipe is equipped with multiple clamps, which are connected to the upper return pipe or flange of the respirator oil return device.

10. An engine, characterized in that, Includes a respirator as described in any one of claims 8-9.

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