Ventilation structure of marine winch gearbox

Abstract

The utility model discloses a ventilation structure of a marine winch gear box, which comprises a ventilation pipe and a mounting plate which are both positioned in the gear box; the mounting plate is fixed on the inner wall of the gearbox, and the breather pipe penetrates through and is fixed on the mounting plate; the breather pipe comprises a straight pipe and an inverted U-shaped pipe positioned at the top end of the straight pipe which are mutually communicated and integrated; the end opening, away from the straight pipe part, of the inverted-U-shaped pipe faces the bottom of the gearbox, and the end opening, away from the inverted-U-shaped pipe, of the straight pipe penetrates through a box body bottom plate of the gearbox and communicates with outside air. The ventilation structure has a good waterproof effect during ventilation, can prevent oil in the gearbox from splashing and leaking out, and is more suitable for a humid and watery using environment on a ship.

Description

Technical Field

[0001] The utility model relates to the technical field of winch gear boxes, in particular to a ventilation structure of a marine winch gear box. Background Art

[0002] When the gearbox is running, as the internal gears rotate and generate heat due to friction, the increase in oil temperature will cause the air inside the box to expand due to the heat and increase the pressure. Therefore, it is necessary to design a vent pipe to discharge the hot air, oil and gas, etc., to maintain the appropriate pressure in the box and avoid problems such as leakage at the seal due to excessive pressure.

[0003] Conventional gearbox breather pipes are often installed vertically or diagonally on the top cover or upper sidewall of the gearbox. For example, patent application CN113446383A discloses a gearbox breather device and a gearbox comprising a breather body and a breather cap. The breather body is cylindrical and includes a bottom surface and a first sidewall. The first sidewall is provided with a first through-hole located at one end of the first sidewall near the bottom surface and communicating with the interior of the breather body. The breather cap is buckled onto the top of the breather body, forming a cavity between the inner wall of the breather cap and the breather body.

[0004] In view of the above-mentioned prior art, the inventor believes that the waterproof performance of the existing gearbox ventilation structure is poor, especially when used in a humid and watery environment on board a ship, external moisture and liquid can easily enter the gearbox and affect the normal operation of the gearbox. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a ventilation structure for a marine winch gearbox, which has a good waterproof effect while achieving ventilation, and can effectively prevent the oil splashing in the gearbox from being discharged through the ventilation pipe, and is more suitable for the humid and watery environment on board.

[0006] In order to achieve the above-mentioned object, the utility model provides a ventilation structure of a marine winch gearbox, comprising a ventilation pipe and a mounting plate, wherein the ventilation pipe and the mounting plate are both located inside the gearbox; the mounting plate is fixed to the inner wall of the gearbox, and the ventilation pipe is passed through and fixed to the mounting plate;

[0007] The ventilation pipe includes a straight pipe that is interconnected and integrated, and an inverted U-shaped pipe located at the top end of the straight pipe; the end of the inverted U-shaped pipe away from the straight pipe is arranged toward the bottom of the gear box, and the end of the straight pipe away from the inverted U-shaped pipe passes through the bottom plate of the gear box and is connected to the outside air.

[0008] Furthermore, it also includes an oil-blocking sleeve, which is fixed on the mounting plate. The top of the oil-blocking sleeve is opened, and the end of the inverted U-shaped tube away from the straight tube is inserted into the oil-blocking sleeve.

[0009] Furthermore, an oil drain port is provided at the bottom of the side wall of the oil retaining sleeve.

[0010] Furthermore, one end of the ventilation pipe passing through the gear box bottom plate is connected to an air cap, and a central air channel is opened in the center of the air cap, and the central air channel is connected to the air inlet of the ventilation pipe; a labyrinth air path is provided in the air cap, and the labyrinth air path is spirally coiled on the outside of the central air channel, one end of the labyrinth air path is connected to the outside air, and the other end is connected to the central air channel.

[0011] Furthermore, a floating block is provided in the central air channel, and the floating block is movably connected to the central air channel. A constriction is provided at one end of the central air channel close to the ventilation pipe.

[0012] Furthermore, a filter is provided in the ventilation pipe.

[0013] Beneficial effects of the utility model:

[0014] The shape and structural setting of the vent pipe of the utility model can effectively block the penetration and inflow of external moisture and liquid while ventilating because the straight pipe is vertically downward, and the oil splashing in the gear box is not easy to enter the vent pipe and flow out; the design of the oil-blocking sleeve blocks the port of the vent pipe to further prevent oil leakage; the design of the air cap and the filter can ensure the cleanliness of the gas entering the gear box, prevent external dust, impurities, etc. from entering the interior of the equipment with the air, reduce the operating wear of parts, and ensure the transmission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model when the vent pipe is installed in the gear box.

[0016] Figure 2 It is a structural schematic diagram of the ventilation structure of the utility model.

[0017] Figure 3 It is a partial structural diagram of the utility model when the gas cap is connected to the vent pipe.

[0018] Figure 4 It is a cross-sectional view of the gas cap in the utility model.

[0019] In the figure: 1. Ventilation pipe; 11. Straight pipe; 111. Filter; 12. Inverted U-shaped pipe; 2. Mounting plate; 3. Oil retaining sleeve; 31. Oil drain port; 4. Air cap; 41. Center air duct; 42. Labyrinth air path; 43. Float. DETAILED DESCRIPTION

[0020] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0021] The utility model discloses a ventilation structure of a marine winch gear box.

[0022] Reference Figure 1 and Figure 2 A ventilation structure for a marine winch gearbox includes a ventilation pipe 1, a mounting plate 2, and an oil retaining sleeve 3. The ventilation pipe 1, the mounting plate 2, and the oil retaining sleeve 3 are all located inside the gearbox; the mounting plate 2 is welded and fixed to the inner wall of the gearbox, and the ventilation pipe 1 is passed through and fixed to the mounting plate 2. The ventilation pipe 1 includes a straight pipe 11 that is interconnected and integrated, and an inverted U-shaped pipe 12 located at the top of the straight pipe 11; the end of the inverted U-shaped pipe 12 away from the straight pipe 11 is arranged toward the bottom of the gearbox, and the end of the straight pipe 11 away from the inverted U-shaped pipe 12 passes through the bottom plate of the gearbox and is connected to the outside air. The shape and structural arrangement of the ventilation pipe 1 can effectively block the penetration and inflow of external moisture and liquid while ventilating because the straight pipe 11 is vertically downward, and the oil splashed in the gearbox is not easy to enter the ventilation pipe 1 and flow out.

[0023] Reference Figure 1 and Figure 2 The oil-blocking sleeve 3 is fixed on the mounting plate 2, and an opening is provided at the top of the oil-blocking sleeve 3. The port of the inverted U-shaped tube 12 away from the straight tube 11 is inserted into the oil-blocking sleeve 3. An oil drain port 31 is provided at the bottom of the side wall of the oil-blocking sleeve 3. The design of the oil-blocking sleeve 3 blocks the port of the vent pipe 1, which can further prevent splashing oil and oil mist from being discharged from the vent pipe 1. Even if part of the oil mist enters the inverted U-shaped tube 12, it will condense into oil droplets and fall down. The design of the oil drain port 31 is used to discharge the oil that enters the oil-blocking sleeve 3, and prevent the oil from accumulating in the oil-blocking sleeve 3 so that the vent pipe 1 cannot be ventilated smoothly.

[0024] Reference Figure 3 and Figure 4 In some embodiments, one end of the vent pipe 1 extending through the bottom plate of the gearbox is connected to an air cap 4. A central air channel 41 is provided in the center of the air cap 4, which is connected to the air inlet of the vent pipe 1. A labyrinth air path 42 is provided inside the air cap 4. The labyrinth air path 42 is spirally wound around the outside of the central air channel 41. One end of the labyrinth air path 42 is connected to the outside air, and the other end is connected to the central air channel 41. The labyrinth air path 42 in the air cap 4 increases the flow distance of the gas and changes the direction of gas flow, making it difficult for the gas to pass smoothly and quickly. Dust and foreign particles in the gas will be retained in the channel due to constant collisions with the channel walls, thus playing a certain filtering role. A filter 111 is also provided inside the vent pipe 1 for secondary filtration to ensure the cleanliness of the gas entering the gearbox and prevent external dust and foreign particles from entering the equipment along with the air, exacerbating the wear of components and affecting its transmission efficiency.

[0025] Reference Figure 3 and Figure 4 A cylindrical float 43 is installed in the central airway 41 and is movably connected to the central airway 41. A constriction is provided at one end of the central airway 41 near the vent tube 1, with a diameter smaller than that of the float 43. When the air cap 4 is submerged in water, the float 43 is moved upward by the buoyancy force, thereby blocking the air outlet of the central airway 41, sealing the vent tube 1 and preventing water from entering the gearbox. When the buoyancy force disappears, the float 43 falls back under the action of gravity, and the vent tube 1 is once again ventilated.

[0026] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A ventilation structure for a marine winch gearbox, characterized in that: It comprises a vent pipe (1) and a mounting plate (2), wherein the vent pipe (1) and the mounting plate (2) are both located inside the gear box; the mounting plate (2) is fixed to the inner wall of the gear box, and the vent pipe (1) is passed through and fixed on the mounting plate (2); The vent pipe (1) comprises a straight pipe (11) and an inverted U-shaped pipe (12) located at the top end of the straight pipe (11), which are interconnected and integrated; the end of the inverted U-shaped pipe (12) away from the straight pipe (11) is arranged toward the bottom of the gear box, and the end of the straight pipe (11) away from the inverted U-shaped pipe (12) passes through the bottom plate of the gear box and is connected to the outside air.

2. The ventilation structure of a marine winch gearbox according to claim 1, characterized in that: It also includes an oil-blocking sleeve (3), which is fixed on the mounting plate (2). The top of the oil-blocking sleeve (3) is open, and the inverted U-shaped tube (12) is inserted into the oil-blocking sleeve (3) at a port away from the straight tube (11).

3. The ventilation structure of a marine winch gearbox according to claim 2, characterized in that: An oil discharge port (31) is provided at the bottom of the side wall of the oil retaining sleeve (3).

4. The ventilation structure of a marine winch gearbox according to any one of claims 1 to 3, characterized in that: One end of the vent pipe (1) passing through the bottom plate of the gear box is connected to an air cap (4), a central air passage (41) is provided at the center of the air cap (4), and the central air passage (41) is communicated with the air inlet of the vent pipe (1); a labyrinth air path (42) is provided in the air cap (4), and the labyrinth air path (42) is spirally wound around the outside of the central air passage (41), one end of the labyrinth air path (42) is communicated with the outside air, and the other end is communicated with the central air passage (41).

5. The ventilation structure of a marine winch gearbox according to claim 4, characterized in that: A floating block (43) is provided in the central air channel (41), and the floating block (43) is movably connected to the central air channel (41). A constriction is provided at one end of the central air channel (41) close to the ventilation pipe (1).

6. The ventilation structure of a marine winch gearbox according to claim 5, characterized in that: A filter screen (111) is provided in the ventilation pipe (1).

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