Large-aperture ventilation cap for speed reducer
By using the inclined square hole design of the large-diameter vent cap and the filter cotton structure, the problem of vent blockage in the main reducer of the coal mill was solved, achieving oil-gas separation and lubricating oil cleaning, improving equipment operation stability and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-03-20
AI Technical Summary
The vent holes of the main reducer of the coal mill are easily blocked by the mixture of oil, gas and dust, which leads to oil-gas pressure imbalance and deterioration of lubricating oil, affecting the stability and life of the equipment. In addition, the traditional vent hole design is expensive and ineffective.
Design a large-aperture breathable cap that uses an inclined square hole structure to form a spiral airflow to separate oil and gas, combined with filter cotton for dust prevention, to ensure air pressure balance and lubricant cleanliness, including cap body, cap seat and threaded connection.
It achieves efficient oil-gas separation, prevents leakage, maintains gas pressure balance, improves lubrication performance, reduces maintenance costs, and extends equipment life.
Smart Images
Figure CN224017682U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical engineering field especially relates to a big aperture breather cap for speed reducer. BACKGROUND
[0002] The coal mill of the thermal power plant is as the key equipment, and its stable operation is important. However, the main reducer of the coal mill faces a series of tricky problems in the continuous operation process. On the one hand, due to the continuous conduction of the high temperature inside the coal mill, the oil temperature at the output flange position of the main reducer is significantly higher than the oil tank temperature, leading to the imbalance of the internal oil gas pressure. On the other hand, the original designed breather hole size of the reducer is small, and in the long-term operation, the mixture of oil gas and dust is easily blocked. This blockage not only destroys the air pressure balance inside the reducer, causes the overflow of oil gas and oil from the gap of the rotating part of the output flange, causes the serious pollution of the surface of the reducer, but also accelerates the deterioration of the lubricating oil, reduces the lubrication effect of the equipment, and further affects the normal operation and service life of the equipment. In addition, the traditional outsourcing or commissioning processing plant processing breather hole mode, due to the required quantity is more, the cost is high, and the actual effect is difficult to match the expectation, and the problem cannot be fundamentally solved. SUMMARY
[0003] The utility model aims at providing a big aperture breather cap for speed reducer, to provide a kind of speed reducer breather device that can realize oil gas efficient separation, dust effective barrier and low maintenance cost simultaneously.
[0004] The utility model is adopted following technical scheme realizes: a kind of big aperture breather cap for speed reducer, including cap body and cap seat, the cap body is located above cap seat and is connected into integral structure with cap seat, the cap seat below is equipped with the screw thread of connecting speed reducer;The cap body is cylindrical structure, is equipped with cavity inside, and multiple breather holes are evenly provided on its circumference, the breather hole is square hole and side wall is inclined to be arranged, each breather hole is distributed along the rotation of cap body circumferential surface, forms the passage that guiding oil gas mixture generates spiral rising airflow in cavity;The cap seat is equipped with through-hole passing through its upper and lower ends, for the communication of cap body cavity and speed reducer oil tank.
[0005] By the direction of inclined setting opening, spiral rising rotating airflow is formed in the cavity of cap body to guide oil gas mixture, oil gas separates oil molecules contained in oil gas under the action of centrifugal force, and returns to oil tank along pipe wall. The gas flow rate in the rotating area is higher than that in the peripheral area, and the static pressure in the high-flow center area is lower, which can attract surrounding gas to flow to low pressure, assisting the discharge of oil gas in the oil tank.
[0006] Further, the total area of the breather hole accounts for more than 50% of the area of the cap body circumference.
[0007] The large air vent hole increases the cross-sectional area of the flow-through part, significantly improving the air permeability. The problem of blockage by the mixture of oil gas and dust in the long-term operation of the speed reducer due to the small size of the air vent hole is prevented. The air pressure balance inside the speed reducer is maintained for a long time, and the oil gas leakage is eliminated from the source.
[0008] Further, the angle between the side edge and the bottom edge of the air vent hole is 76°, the left and right side edges are symmetrically arranged, and the top edge is parallel to and horizontally arranged with the bottom edge.
[0009] Further, the number of air vent holes is three, which are uniformly and symmetrically distributed along the circumferential surface of the cap body, and the structural connection strength between the upper and lower end surfaces of the cap body is maintained through the unperforated part.
[0010] Under the premise of ensuring the overall area ratio of the air vent hole, the flow-through part of the single air vent hole also has sufficient cross-sectional area, thereby preventing blockage.
[0011] Further, the circumferential surface of the cap body is covered with filter cotton, and the filter cotton completely wraps the air vent hole and is connected with the cap body through a detachable fixing part.
[0012] The setting of the filter cotton builds a solid protective barrier, effectively isolates dust, prevents pollution of lubricating oil, guarantees the quality of lubricating oil, and thus improves the lubrication performance and operation stability of the equipment.
[0013] Further, the detachable fixing part is a cable tie or iron wire, which is distributed along the axial direction of the cap body to constrain the radial displacement of the filter cotton.
[0014] Further, the thickness of the side wall of the air vent hole in the oil gas outflow direction is 3-5mm.
[0015] The large-aperture air vent cap for the speed reducer has the following beneficial effects:
[0016] By expanding the cross-sectional area (ratio ≥ 50%) of the air vent hole and tilting the square hole rotation layout, the oil gas is guided to form a spiral upward airflow, the centrifugal force is used to efficiently separate oil molecules and return to the oil tank, and the thickness of the side wall of the air vent hole is designed, thereby completely solving the problems of easy blockage of the traditional air vent hole and oil leakage, and maintaining the air pressure balance of the speed reducer.
[0017] The detachable filter cotton is additionally arranged outside the air vent hole to form multiple barriers, effectively block dust intrusion, guarantee the cleanliness of the lubricating oil, improve the lubrication stability of the equipment, and prolong the service life.
[0018] The improved oil separation efficiency makes the output flange of the speed reducer achieve zero leakage, eliminates the pollution of oil stains to the environment, reduces the frequency of manual cleaning of high-risk areas, and reduces the operation safety risk.
[0019] After a month of rigorous experimental verification, the output flange position of the modified reducer realizes zero oil and gas leakage, and the maintenance cost is reduced; a single improvement saves about 2,000 yuan in cost, and the scheme has strong universality and can be quickly replicated to coal mills and other similar industrial equipment, and has cross-industry promotion potential. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without creative labor.
[0021] Figure 1 It is a schematic view of a large-aperture air-permeable cap for a reducer.
[0022] In the figure, 1-cap body, 2-air hole, 3-filter cotton, 4-cap seat, 5-thread. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Embodiment 1
[0025] As shown in Figure 1 A large-aperture air-permeable cap for a reducer includes a cap body 1 and a cap seat 4, the cap body 1 is located above the cap seat 4, the cap body 1 and the cap seat 4 are connected into an integral structure, and the cap seat 4 is provided below with a thread 5 connected to the reducer.
[0026] The cap body 1 is a cylindrical structure, the lower end surface of the cylinder is connected with the cap seat 4, the cap body 1 is internally provided with a cavity, the circumferential surface of the cap body 1 is provided with a gas permeable hole 2 communicating with the internal cavity, the cap seat 4 is internally provided with a through hole penetrating through the upper and lower ends of the cap seat 4, thereby communicating the internal cavity of the cap body 1 with the oil tank of the speed reducer. The side wall of the gas permeable hole 2 has a certain thickness in the direction of oil gas outflow.
[0027] The gas permeable hole 2 is a square hole, the side wall of the square hole is obliquely arranged, the gas permeable hole 2 is arranged along the circumferential surface of the cap body 1 and is uniformly arranged with a plurality of gas permeable holes along the circumferential surface, and the obliquely arranged opening direction guides the oil gas mixture to form a spiral upward rotating gas flow in the cavity of the cap body 1. Under the action of centrifugal force, the oil gas separates the oil molecules contained in the oil gas, and the oil molecules return to the oil tank along the pipe wall. The gas flow rate in the rotating area is higher than that in the peripheral area, the static pressure in the high-flow center area is lower, which can attract the surrounding gas to flow to the low pressure area, thereby assisting the discharge of oil gas in the oil tank. Embodiment 2
[0028] This embodiment is further optimized on the basis of embodiment 1, specifically:
[0029] The area of the gas permeable hole 2 should account for more than 50% of the circumferential surface of the cap body 1. By increasing the cross-sectional area of the flow passage through the larger gas permeable hole 2, the gas permeability is significantly improved. Prevents the problem of being blocked by the mixture of oil gas and dust due to the small size of the gas permeable hole of the speed reducer in long-term operation. Long-term maintain the air pressure balance in the speed reducer, and eliminate the oil gas leakage phenomenon from the source. Embodiment 3
[0030] This embodiment is further optimized on the basis of embodiment 1, specifically:
[0031] The cap body 1 is further provided with filter cotton 3, the filter cotton 3 is wrapped on the circumferential surface of the cap body 1, and the filter cotton 3 completely covers the gas permeable hole 2. The filter cotton 3 is fixed on the cap body 1 by being bound with a strap or a wire.
[0032] The filter cotton 3 forms a solid protective barrier, effectively isolates dust, prevents pollution of lubricating oil, ensures the quality of lubricating oil, and improves the lubrication performance and operation stability of the equipment. Embodiment 4
[0033] This embodiment is further optimized on the basis of embodiment 2, specifically:
[0034] The three air vents 2 are symmetrically arranged on the cap body 1, and the three air vents 2 have the advantages that, on the premise of ensuring the overall area ratio of the air vents 2, the single air vent 2 also has sufficient cross-sectional area, thereby preventing blockage. Meanwhile, the three air vents 2 also mean that the upper and lower end surfaces of the cap body 1 are connected through three unperforated portions, thereby ensuring the strength of the cap body 1. Example 5
[0035] This embodiment is further optimized on the basis of example 4, specifically:
[0036] The included angle between the side edge and the bottom edge of the air vent 2 is 76°, and the left and right side edges of the air vent 2 are kept the same angle with the bottom edge, and the top edge and the bottom edge are parallel and horizontally arranged.
[0037] In the above examples, the basic principle and main features of the utility model and the advantages of the utility model are described. It should be understood by those skilled in the art that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model. Any modification and change made by those skilled in the art without departing from the spirit and scope of the utility model should be within the protection scope of the claims of the utility model.
Claims
1. A large-diameter vent cap for a speed reducer, characterized in that, The device includes a cap body (1) and a cap seat (4). The cap body (1) is located above the cap seat (4) and is connected to the cap seat (4) to form an integral structure. The cap seat (4) has a thread (5) for connecting the reducer below it. The cap body (1) is a cylindrical structure with an internal cavity. Multiple ventilation holes (2) are evenly opened on its circumference. The ventilation holes (2) are square holes with inclined side walls. Each ventilation hole (2) is distributed in a rotating manner along the circumference of the cap body (1) to form a channel for guiding the oil-gas mixture to generate a spiral upward airflow in the cavity. The cap seat (4) has a through hole that passes through its upper and lower ends to connect the cavity of the cap body (1) with the reducer oil tank.
2. The large-diameter vent cap for a speed reducer according to claim 1, characterized in that, The total area of the ventilation holes (2) accounts for more than 50% of the circumferential surface area of the cap body (1).
3. A large-diameter vent cap for a speed reducer according to claim 1, characterized in that, The vent hole (2) has an angle of 76° between its side and bottom, and the left and right sides are symmetrically arranged. The top and bottom sides are parallel and horizontally arranged.
4. A large-diameter vent cap for a speed reducer according to claim 1, characterized in that, The number of ventilation holes (2) is three, which are evenly and symmetrically distributed along the circumference of the cap body (1), and the upper and lower end faces of the cap body (1) maintain structural connection strength through the unopened part.
5. A large-diameter vent cap for a speed reducer according to claim 1, characterized in that, The circumferential surface of the cap body (1) is covered with filter cotton (3), which completely wraps the ventilation holes (2) and is connected to the cap body (1) by a detachable fastener.
6. A large-diameter vent cap for a speed reducer according to claim 5, characterized in that, The detachable fasteners are cable ties or wires, distributed along the axial direction of the cap body (1) to constrain the radial displacement of the filter cotton (3).
7. A large-diameter vent cap for a speed reducer according to claim 1, characterized in that, The thickness of the sidewall of the vent (2) in the direction of oil flow is 3-5 mm.