Oil way self-exhaust anti-overflow device

Abstract

The invention belongs to the technical field of hydraulic system oil way purification, and discloses an oil way self-exhaust anti-overflow device which comprises a barrel-shaped separation cavity, the left side and the right side of the barrel-shaped separation cavity are communicated with an oil inlet pipe and an oil return tank pipe respectively, and an exhaust pipe is arranged at the top of the barrel-shaped separation cavity; a pair of flow guide hole plates which are symmetrically arranged are arranged in the middle of the barrel-shaped separation cavity in the left-right direction, inclined holes are formed in the flow guide hole plates, and the axes of the two inclined holes which are symmetrical in the left-right direction of the two flow guide hole plates intersect in a V shape. According to the oil way self-exhaust anti-overflow device, efficient bubble gathering is achieved through expansion speed reduction and inclined hole flow guide, oil liquid is prevented from overflowing, the problem of oil-gas mixed emission of a traditional exhaust device is solved, and the system stability is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic system oil circuit purification, and particularly relates to an oil circuit self-venting and overflow prevention device. Background Technology

[0002] Traditional oil-gas separators use filter screens or centrifugal designs, which have problems such as large pressure drop (>0.3MPa), low exhaust efficiency, and oil-gas mixture emissions from the exhaust pipe, leading to oil loss; the response delay of the exhaust pipe controlled by the level switch is delayed, and gas accumulation can easily cause system cavitation.

[0003] Under high-pressure conditions, dissolved air in hydraulic systems precipitates and forms bubbles, reducing the elastic modulus of the hydraulic fluid and causing sluggish response of the actuators. Current technologies cannot achieve complete gas-liquid separation under low flow resistance conditions, necessitating the development of devices with zero oil loss and adaptive venting. Summary of the Invention

[0004] Based on the shortcomings of the prior art, the technical problem solved by the present invention is to provide an oil circuit self-venting and overflow prevention device, which achieves efficient bubble aggregation and prevents oil overflow through capacity expansion and speed reduction and oblique hole guidance, thus solving the problem of oil-gas mixing and emission of traditional venting devices and improving system stability.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention provides an oil circuit self-venting and overflow prevention device, including a barrel-shaped separation chamber. The left and right sides of the barrel-shaped separation chamber are respectively connected to an oil inlet pipe and an oil return tank pipe, and an exhaust pipe is provided at the top. The barrel-shaped separation chamber has a pair of symmetrically arranged guide plates in the middle of the left and right direction. The guide plates have inclined holes, and the axes of the two symmetrical inclined holes of the two guide plates intersect in a V-shape.

[0006] Furthermore, the oil inlet pipe is provided with an umbrella-shaped diffuser at its outlet end within the barrel-shaped separation chamber.

[0007] Furthermore, the inlet of the return oil tank pipe is located in the middle of the barrel-shaped separation chamber in the vertical direction.

[0008] Preferably, the included angle θ between the axes of the two symmetrical oblique holes satisfies: 20°≤θ≤30°.

[0009] Optionally, the intersection point of the axes of the two symmetrical inclined holes of the two guide plates is located above the horizontal line connecting the two inclined holes through the center of their inner longitudinal section, and the height between the intersection point and the horizontal line is 1 / 4 of the length of the horizontal line.

[0010] Furthermore, the barrel-shaped separation cavity has an elliptical cylindrical structure with a length-to-diameter ratio of 1.5-2:1.

[0011] Optionally, the inner wall of the barrel-shaped separation cavity is provided with an oleophilic and hydrophobic coating.

[0012] Furthermore, the barrel-shaped separation chamber is made of stainless steel or aluminum alloy.

[0013] Furthermore, the two ends of the flow guide plate extend to the top and bottom of the barrel-shaped separation cavity.

[0014] Therefore, the oil circuit self-venting and overflow prevention device of the present invention has at least the following beneficial effects: 1. Zero oil loss venting: The volume-flow matching model ensures that oil does not enter the venting pipe, saving more than 500L of hydraulic oil per unit per year; 2. Maintenance-free operation: The guide plate with angled holes has a self-cleaning design to avoid clogging and has a long service life (compared to a filter screen with a replacement cycle of 3 months). 3. System compatibility: It can be integrated into the existing fuel tank bypass, with low modification costs.

[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the invention more apparent and understandable, the following detailed description is provided in conjunction with preferred embodiments and accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0017] Figure 1 This is a schematic diagram of the structure of the oil circuit self-venting and overflow prevention device of the present invention; Figure 2 This is a cross-sectional view of the oil circuit self-venting anti-overflow device of the present invention; Figure 3 This is an enlarged view of the two guide plates of the present invention facing each other (the included angle θ of the axes of the two oblique holes that are symmetrical to each other is 20°).

[0018] In the diagram, 1-oil inlet pipe, 2-umbrella-shaped diffuser, 3-guide plate, 4-slanted hole, 5-barrel-shaped separation chamber, 6-exhaust pipe, 7-exhaust pipe cover, 8-return tank pipe. Detailed Implementation

[0019] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this specification. These embodiments illustrate the principles of the invention, and other aspects, features, and advantages of the invention will become apparent from this detailed description. In the accompanying drawings, the same or similar parts in different figures are indicated by the same reference numerals.

[0020] like Figures 1 to 3 As shown, the oil circuit self-venting and overflow prevention device of the present invention includes a barrel-shaped separation chamber 5. The left and right sides of the barrel-shaped separation chamber 5 are respectively connected to the oil inlet pipe 1 and the oil return tank pipe 8, and the top of the chamber is provided with an exhaust pipe 6. A pair of symmetrically arranged guide plates 3 are provided in the middle of the barrel-shaped separation chamber 5 in the left-right direction. The two ends of the guide plates 3 extend to the top and bottom of the barrel-shaped separation chamber 5. The guide plates 3 are provided with inclined holes 4, and the axes of the two symmetrical inclined holes 4 of the two guide plates 3 intersect in a V-shape. The two guide plates 3 with inclined through holes (inclined holes 4) are tightly spliced ​​together to form a double inclined hole guide assembly, which is installed in the middle of the barrel-shaped separation chamber 5 in the left-right direction. The included angle θ of the axes of the two symmetrical inclined holes 4 satisfies: 20°≤θ≤30°.

[0021] The inner diameter D of the exhaust pipe 6 is ≥ 1.5d (d is the inner diameter of the oil inlet pipe 1), and it is vertically connected to the exhaust port at the top of the barrel-shaped separation chamber 5. The top of the exhaust pipe 6 is equipped with an exhaust pipe cover 7.

[0022] Among them, the inclined through hole of the flow guide plate 3 is a circular hole. The flow guide plate 3 can be made of a porous titanium plate with a thickness of 3mm, and the inclined hole 4 is formed by laser drilling.

[0023] The intersection point of the axes of the two oblique holes 4, which are symmetrical about the left and right sides of the two guide plates 3, is located above the horizontal line connecting the two oblique holes 4 through the center of their inner longitudinal section. The height between the intersection point and the horizontal line is 1 / 4 of the length of the horizontal line.

[0024] The barrel-shaped separation chamber 5 has an elliptical cylindrical structure with a length-to-diameter ratio L / D = 1.5-2:1. The barrel-shaped separation chamber 5 can be made of 304 stainless steel or aluminum alloy. In a specific embodiment, the barrel-shaped separation chamber 5 is formed by welding 304 stainless steel coils, with an inner diameter of 300 mm, a height of 550 mm, and a volume V of 38 L. The inner wall of the barrel-shaped separation chamber 5 is coated with an oleophilic and hydrophobic coating, with a contact angle θ > 110°.

[0025] The oil inlet pipe 1 extends into the interior of the barrel-shaped separation chamber 5. An umbrella-shaped diffuser 2 is installed at the outlet end of the oil inlet pipe 1 within the barrel-shaped separation chamber 5, with an opening ratio of ≥50%. The umbrella-shaped diffuser 2 reduces the oil flow velocity to below 0.1 m / s and increases the dissolved air extraction rate to 95%. The inlet of the return oil tank pipe 8 is located in the middle of the barrel-shaped separation chamber 5 in the vertical direction.

[0026] In this invention, the design of the oblique holes 4 promotes microbubble coalescence as bubbles pass through, and the V-shaped symmetrical layout causes the bubble streamlines to converge upwards towards the central axis of the barrel-shaped separation chamber 5, increasing the rising efficiency by 40%. The effective volume V of the barrel-shaped separation chamber 5 satisfies: V≥10Q (Q is the maximum flow rate of the oil circuit), ensuring an oil residence time >6s (gas rising velocity ≥1cm / s). The height of the gas chamber at the top of the barrel-shaped separation chamber 5 is ≥0.3H (H is the height of the barrel-shaped separation chamber 5), providing a gas buffer space.

[0027] Below, refer to Figures 1 to 3 Based on the above description of structural features, the working process of the oil circuit self-venting anti-overflow device of the present invention will be briefly described as follows: During operation, hydraulic oil enters the barrel-shaped separation chamber 5 after being depressurized and slowed down by the diffuser 2 through the inlet pipe 1. Dissolved air is released in the low-speed zone. As the oil passes through the guide plate 3, the air bubbles are guided by the inclined holes 4, coalesce, and float to the top air chamber of the barrel-shaped separation chamber 5. The gas is discharged through the exhaust pipe 6, and the degassed oil flows back to the oil tank through the return oil tank pipe 8. By designing the ratio of the effective volume V of the barrel-shaped separation chamber 5 to the maximum flow rate Q of the oil circuit (V≥10Q), oil overflow is ensured, and automatic gas-liquid separation is achieved.

[0028] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A self-venting and overflow prevention device for oil circuits, characterized in that, It includes a barrel-shaped separation chamber (5), with an oil inlet pipe (1) and an oil return tank pipe (8) connected to the left and right sides of the barrel-shaped separation chamber (5) respectively, and an exhaust pipe (6) provided at the top. The barrel-shaped separation cavity (5) has a pair of symmetrically arranged guide plates (3) in the middle of the left and right direction. The guide plates (3) have inclined holes (4). The axes of the two symmetrical inclined holes (4) of the two guide plates (3) intersect in a V-shape.

2. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The oil inlet pipe (1) is provided with an umbrella-shaped diffuser (2) at its outlet end inside the barrel-shaped separation chamber (5).

3. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The inlet of the return oil tank pipe (8) is located in the middle of the barrel-shaped separation chamber (5) in the vertical direction.

4. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The included angle θ between the axes of the two symmetrical oblique holes (4) satisfies: 20°≤θ≤30°.

5. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The intersection of the axes of the two oblique holes (4) of the two guide plates (3) is located above the horizontal line connecting the two oblique holes (4) through the center of their inner longitudinal section. The height between the intersection and the horizontal line is 1 / 4 of the length of the horizontal line.

6. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The barrel-shaped separation cavity (5) has an elliptical cylindrical structure with a length-to-diameter ratio of 1.5-2:

1.

7. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The inner wall of the barrel-shaped separation cavity (5) is provided with an oleophilic and hydrophobic coating.

8. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The barrel-shaped separation chamber (5) is made of stainless steel or aluminum alloy.

9. The oil circuit self-venting and overflow prevention device as described in claim 1, characterized in that, The two ends of the flow guide plate (3) extend to the top and bottom of the barrel-shaped separation cavity (5).

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