CN220268382U - Air ventilation valve of power system - Google Patents

Abstract

The utility model relates to a ventilation valve of a power system, wherein a waterproof ventilation film is arranged at an outlet of a containing part, the containing part is provided with a containing cavity filled with oil-absorbing ventilation pieces, the containing cavity is also filled with at least one layer of oil-blocking ventilation pieces, and the oil-blocking ventilation pieces are in contact with the inner wall of the containing cavity; the oil-resistant air-permeable member is positioned in the oil-absorbing air-permeable member and/or positioned between the oil-absorbing air-permeable member and the waterproof air-permeable membrane; the cavity bottom of the accommodating cavity is provided with a plurality of guide strips, the guide strips are annularly arranged at the circumference of the inlet of the cavity bottom, and the guide strips support the oil-absorbing and air-permeable piece; a diversion flow channel is formed between two adjacent diversion strips, and the diversion flow channel inclines from the edge of the cavity bottom to the inlet of the cavity bottom, so that the device has the advantages of supporting the oil absorption ventilation piece by the diversion strips, realizing oil dispersion diversion by using the diversion strips to form the diversion flow channel, preventing the oil absorption ventilation piece from absorbing oil and collapsing, and avoiding oil from polluting a waterproof ventilation layer.

Description

Air ventilation valve of power system

Technical Field

The utility model relates to the technical field of power system valves, in particular to a ventilation valve of a power system.

Background

Some powertrain assemblies in vehicles (e.g., transmissions, final drives, or transaxles, etc.) require internal and external air pressure balance, e.g., a transmission is a mechanism for transmitting and changing engine speed and torque, most often using gear transmissions. In the working process of the transmission, oil temperature is increased due to friction between gears, oil vapor generated by lubricating oil is easy to cause pressure increase in the transmission shell, and oil seal is damaged to cause lubricating oil leakage when serious, so that the transmission is damaged. To prevent this failure, it is common to provide a vent to the outside atmosphere in the transmission to maintain pressure balance between the inside and outside of the transmission. Meanwhile, in order to keep the air tightness of the gearbox, an air ventilation valve is arranged in the air ventilation hole.

For such ventilation valves, the exhausted gas is often accompanied by oil, and thus, in addition to the conventional waterproof ventilation membrane, an oil-absorbing ventilation member is provided. However, when the oil-absorbing and breathable piece is full of oil, the oil can sink, and the oil can permeate towards the waterproof and breathable film, so that the waterproof and breathable film is polluted by oil liquid, and the waterproof and breathable effects of the waterproof and breathable film are affected. Therefore, improvements to the structure of the ventilation valve of the power system are worth researching.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, thereby providing the ventilation valve of the power system.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the air ventilation valve of the power system comprises a valve seat and a valve cover, wherein the valve seat comprises a containing part and a connecting part which are sequentially communicated to form a channel; the outlet of the containing part is provided with a waterproof and breathable film, the containing part is provided with a containing cavity filled with an oil absorption and breathable piece, the containing cavity is also filled with at least one layer of oil resistance and breathable piece, and the oil resistance and breathable piece is in contact with the inner wall of the containing cavity; the oil-resistant air-permeable member is positioned in the oil-absorbing air-permeable member, and/or the oil-resistant air-permeable member is positioned between the oil-absorbing air-permeable member and the waterproof air-permeable membrane; the bottom of the accommodating cavity is provided with a plurality of guide strips, the guide strips are annularly arranged at the circumference of the inlet of the bottom of the accommodating cavity, and the guide strips support the oil-absorbing and air-permeable piece; and a diversion flow channel is formed between two adjacent diversion strips, and the diversion flow channel inclines from the edge of the cavity bottom to the inlet of the cavity bottom.

According to the air permeable valve of the power system, the waterproof air permeable membrane is arranged at the outlet of the containing part, and the oil-blocking air permeable member is arranged, so that oil pollution to the waterproof air permeable layer can be effectively avoided, and the service life and air permeable effect of the waterproof air permeable layer are reduced.

A plurality of guide strips are arranged at the periphery of the cavity bottom inlet of the accommodating cavity, and the function is that: on the one hand, the oil-absorbing ventilation member filled in the accommodating cavity can be supported, the oil-absorbing ventilation member is prevented from sinking after absorbing oil, on the other hand, a diversion flow channel can be formed between adjacent diversion strips, the diversion channel can effectively disperse oil, so that the oil-absorbing ventilation member filled in the accommodating cavity is prevented from being directly impacted by the oil, and further, the oil-absorbing ventilation member can be prevented from being deformed to sink under the action of large impact force of the oil.

In addition, the diversion channel is inclined from the edge of the cavity bottom of the accommodating cavity to the inlet of the cavity bottom, and the diversion channel has the functions that: on one hand, the oil flowing in from the inlet at the bottom of the cavity can be smoothly led into the diversion flow channel and absorbed by the oil-absorbing and ventilation piece, so that the phenomenon that a large amount of oil can not be absorbed in time and is blocked at the inlet at the bottom of the cavity when the oil floods into the accommodating cavity, and the exhaust effect is influenced can be avoided; meanwhile, the oil is dispersed more uniformly in the diversion flow channel, so that the defect of deformation caused by overlarge oil absorption in the middle part of the oil absorption ventilation piece is avoided; on the other hand, when the oil flows into the diversion flow passage, an upward gradient is generated, so that when the oil is instantaneously poured in, a large amount of oil instantaneously rushes to the tail end of the diversion flow passage, and the edge of the oil-absorbing and ventilation piece absorbs a large amount of oil, so that the oil is easy to overflow from the edge of the oil-absorbing and ventilation piece.

In conclusion, the oil-absorbing ventilation piece can be effectively prevented from overflowing from the edge of the oil-blocking ventilation piece due to deformation sinking, so that the oil contaminates the waterproof ventilation film, and the service life of the ventilation valve is prolonged.

Preferably, the flow guide channel forms an inclination angle A with an extension line of the edge of the cavity bottom, wherein 10 DEG < 30 deg.

The reasonable arrangement of the inclined angle A can play a role in guiding the oil flowing into the accommodating cavity, so that the defect that the exhaust is influenced due to the fact that the oil blocks the inlet of the cavity bottom due to poor guiding effect when the inclined angle is too small can be avoided; and the defect that the oil-absorbing and air-permeable member is easy to sink due to the fact that the oil generates larger impact force on the oil-absorbing and air-permeable member when the inclination angle is overlarge can be avoided.

Preferably, the air permeability of the oil-absorbing and air-permeable member is not lower than 2 times that of the oil-blocking and air-permeable member, the elastic modulus is 100-150 GPa, and the tensile strength is 3-6 GPa.

The ventilation amount of the oil-absorbing ventilation piece is set to be not lower than 2 times of that of the oil-blocking ventilation piece, so that the oil-absorbing ventilation piece can absorb oil and simultaneously discharge gas better; the oil-absorbing and air-permeable member is provided with proper elastic modulus and tensile strength, so that the oil-absorbing and air-permeable member has enough deformation resistance, and deformation sinking of the oil-absorbing and air-permeable member after oil absorption can be effectively avoided; the oil-absorbing ventilation piece is provided with a proper oil absorption amount, so that oil flowing into the cavity bottom inlet of the accommodating cavity can be absorbed in time, and the inlet is prevented from being blocked by the oil.

Preferably, the distance between the oil-resistant air-permeable member and the waterproof air-permeable membrane is not more than 50% of the total thickness of the oil-absorbing air-permeable member, and the thickness of the oil-resistant air-permeable member is 2-5% of the total thickness of the oil-absorbing air-permeable member; the air permeability of the oil-resistant air permeable piece is 10-20 ml/min.mm ² 。

The distance between the oil-resistant breathable piece and the waterproof breathable film is not more than 50% of the total thickness of the oil-absorbing piece, so that the oil-resistant breathable piece can achieve an oil-resistant effect, and the absorption of the oil by the oil-absorbing breathable piece cannot be influenced due to the fact that the distance between the oil-resistant breathable piece and the bottom of the accommodating cavity is too close; the thickness of the oil-resistant ventilation piece is smaller than 2-5% of the total thickness of the oil-resistant ventilation piece, so that the oil-resistant ventilation piece is smaller in thickness, has proper softness, is more attached to the oil-resistant ventilation piece, can deform along with deformation of the oil-resistant ventilation piece, and effectively avoids a gap between the deformed oil-resistant ventilation piece and an oil-resistant ventilation piece, so that oil overflows from the gap; the oil-resistant ventilation member is provided with a proper ventilation amount, is favorable for the discharge of gas.

Preferably, the plurality of guide strips form a supporting surface, and the ratio of the area of the supporting surface to the area of the bottom of the accommodating cavity is 0.3-0.7.

The guide strips provide enough support area for the oil-absorbing and ventilating piece, so that collapse deformation of the oil-absorbing and ventilating piece after oil absorption can be avoided, and meanwhile, the formed support surface can also prevent the oil-absorbing and ventilating piece from blocking the guide flow channel after collapse deformation; if the area of the supporting surface is larger than the area of the bottom of the accommodating cavity, the amount of liquid oil entering the diversion flow channel is reduced, the oil absorption in the middle position of the oil absorption ventilation piece is easily excessive, deformation occurs, and the throughput of gas is reduced; if the area of the supporting surface is smaller than the area of the cavity bottom of the accommodating cavity, the supporting of the oil-absorbing and air-permeable piece is reduced, and collapse deformation is easy to cause.

Preferably, the width of the diversion flow channel is increased in a gradient manner from the inlet of the cavity bottom to the edge of the cavity bottom.

The width of the flow guide flow channel is increased in a gradient manner from the inlet of the cavity bottom to the edge of the cavity bottom, when the amount of oil flowing into the flow guide flow channel instantaneously is overlarge, the oil is gradually diffused in the flow guide flow channel, the situation that the oil is directly flushed to the edge of the cavity bottom, the edge of the oil absorption ventilation piece is fully sucked with the oil, the oil is oozed from the edge of the oil resistance ventilation piece, and a waterproof ventilation film is polluted is further effectively avoided.

Preferably, the ratio of the inner diameter of the passage of the connection portion to the inner diameter of the receiving chamber is 0.15 to 0.35.

The channel of the connecting part and the accommodating cavity are set to have proper inner diameter ratio, so that on one hand, excessive oil can be prevented from rushing in, the oil can be timely dispersed to each diversion flow channel, and large impact on the oil absorption ventilation piece can be avoided; on the other hand, the impact force is larger when the oil is flushed out from the outlet of the connecting part channel, so that the deformation caused by larger impact on the part of the oil-absorbing and ventilating piece is avoided.

Preferably, the connecting part is provided with a plurality of protruding blocks which are arranged in a staggered way in the channel so that the connecting part is provided with a labyrinth channel in the channel; the distance h1 between the outlet of the labyrinth passage and the inlet of the accommodating cavity is 5.8-7.8 mm.

The plurality of mutually staggered lugs form a labyrinth passage, so that when oil passes through the labyrinth passage, can collide with the convex blocks to form vortex so as to reduce the flow velocity of liquid oil. On one hand, the vortex formed by collision of the oil liquid and the convex blocks can reduce the flow velocity of the oil liquid, so that the oil liquid and the gas are pre-separated, and the throughput of the gas is increased; on the other hand, the mutually staggered arrangement of the plurality of protruding blocks can increase the flow path of oil liquid without influencing the discharge path of gas, thereby being beneficial to the discharge of gas. In addition, the outlet of the labyrinth channel and the inlet of the accommodating cavity are arranged at proper distances, so that oil can be prevented from directly entering the accommodating cavity in a vortex mode, and further, the condition that the oil cannot be dispersed to each diversion flow channel to block the inlet of the bottom of the accommodating cavity or directly wash the oil-absorbing and air-permeable member can be avoided; on the other hand, the oil can be prevented from rushing into the bottom of the accommodating cavity at a faster flow rate, and the oil can be prevented from generating larger impact force on the oil-absorbing breathable piece and deforming.

Preferably, the axial distance h2 between two mutually staggered said lugs is between 0.8 and 1.6mm.

The proper distance sets up between the lug, can avoid fluid to produce great swirl when flowing through the maze passageway on the one hand, and then produce the jam, reduces the problem of gaseous passing rate, on the other hand, can guarantee the abundant separation of fluid and gas.

Preferably, an exhaust cavity is formed between the waterproof breathable film and the valve cover, a plurality of ventilation holes are formed in the cavity wall of the exhaust cavity, and the side walls of the ventilation holes are radial from the inner wall to the outer wall of the exhaust cavity.

The air holes are radial, so that liquid or pollutants can enter the air valve obliquely when entering the air valve through the air holes, the liquid or pollutants are prevented from directly impacting the waterproof air-permeable membrane, the waterproof air-permeable membrane is further punctured, and the waterproof air-permeable effect is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a ventilation valve of a power system according to the present utility model.

FIG. 2 is a schematic cut-away view of a ventilation valve of the power system of the present utility model.

FIG. 3 is a schematic top view of a ventilation valve of the power system of the present utility model.

FIG. 4 is a schematic cross-sectional view of the ventilation valve of the power system of the present utility model taken along the plane B-B in FIG. 3.

Reference numerals illustrate:

1. a valve seat; 10. a housing part; 101. a receiving chamber; 102. a cavity bottom; 1021. an inlet; 1022. edges; 11. a connection part; 111. a channel; 112. a bump; 113. a labyrinth passage; 12. a connecting piece; 121. a treatment tip; 2. a valve cover; 3. a waterproof breathable film; 4. an oil-absorbing ventilation member; 5. an oil-blocking air-permeable member; 6. a flow guiding strip; 7. a diversion flow passage; 8. a support surface; 9. an exhaust chamber; 91. ventilation holes; 911. a port; 92. an inclined surface.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; it may be a mechanical connection that is made, or may be an electrical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 4, a ventilation valve of a power system according to an embodiment of the present utility model includes a valve seat 1 and a valve cover 2, the valve seat 1 including a receiving portion 10 and a connecting portion 11 which are sequentially communicated to form a passage; the connecting portion 11 is used for being connected with the equipment that needs ventilative, and the relative connecting portion 11 of holding portion 10 is farther from the equipment that needs ventilative, and simultaneously, the export of holding portion 10 is provided with waterproof ventilated membrane 3, and holding portion 10 has the accommodation chamber 101 that fills oil absorption ventilative 4 for from the inside exhaust gas of equipment need pass through oil absorption ventilative 4 before reaching waterproof ventilated membrane 3 earlier, from this, can absorb the fluid in the exhaust gas. However, if the oil-absorbing and ventilating member 4 fails, the oil may still pollute the waterproof and ventilating film 3, so the utility model designs various embodiments to reduce the failure probability of the oil-absorbing and ventilating member 4 or prevent the oil from polluting the waterproof and ventilating film 3 even if the oil-absorbing and ventilating member 4 fails.

Example 1

As shown in fig. 2, in order to avoid the oil contaminating the waterproof and breathable film 3, and further prolong the service life of the waterproof and breathable film 3, the accommodating cavity 101 is further filled with 1 layer, 2 layers or multiple layers of oil-blocking and breathable pieces 5, and the oil-blocking and breathable pieces 5 are in contact with the inner wall of the accommodating cavity 101, so that gaps are avoided between the oil-blocking and breathable pieces 5 and the accommodating cavity 101, and the oil is prevented from penetrating through the gaps (i.e., the oil seeps out from the edge of the oil-blocking and breathable piece 5) to pollute the waterproof and breathable film 3.

The positions where the oil-blocking ventilation pieces 5 are arranged can be various, and the oil-blocking ventilation pieces can be used for blocking oil and ventilation. In this embodiment, the oil-blocking air-permeable member 5 is disposed between the oil-absorbing air-permeable member 4 and the waterproof air-permeable membrane 3, so as to isolate the oil-absorbing air-permeable member 4 from the waterproof air-permeable membrane 3, and even if the oil-absorbing air-permeable member 4 cannot absorb all the oil, the residual oil can be blocked by the oil-blocking air-permeable member 5 and does not pollute the waterproof air-permeable membrane 3; meanwhile, in this embodiment, even if the oil absorbing and ventilating member 4 is deformed and fails, the oil blocking and ventilating member 5 can directly block oil. If the oil-blocking ventilation member 5 is not arranged, even if the oil-absorbing ventilation member 4 absorbs most of the oil, part of the oil can easily pollute the waterproof ventilation membrane 3.

Example two

The difference between the embodiment and the first embodiment is that the oil-blocking air-permeable member 5 is disposed in the oil-absorbing air-permeable member 4, that is, the oil-absorbing air-permeable members 4 are distributed on both sides of the oil-blocking air-permeable member 5, and when the oil-blocking air-permeable member 5 fails accidentally, for example, when a sealing gap exists at the edge of the oil-blocking air-permeable member 5, a small amount of oil passing through the oil-blocking air-permeable member 5 can be absorbed again by the oil-absorbing air-permeable member 4 in time, so that the probability of polluting the waterproof air-permeable membrane 3 is further reduced.

In order to avoid that the arrangement of the oil-blocking air-permeable member 5 affects the oil-absorbing effect of the oil-absorbing air-permeable member 4, the distance between the oil-blocking air-permeable member 5 and the waterproof air-permeable membrane 3 is not more than 50% of the total thickness of the oil-absorbing air-permeable member 4, so that the oil-blocking air-permeable member 5 has a sufficient distance from the cavity bottom 102, i.e., the oil-absorbing air-permeable member 4 is filled in a sufficient amount, so that the oil can be fully absorbed. Further, the thickness of the oil-resistant ventilation piece 5 is 2-5% of the total thickness of the oil-absorbing ventilation piece 4; the air permeability of the oil-resistant air permeable piece 5 is 10-20 ml/min.mm ² And then can avoid hinder oily ventilative spare 5 thickness too big influence its self ventilation effect.

In other embodiments, of course, the oil and gas barrier 5 may be disposed near the cavity bottom 102, i.e. the distance between the oil and gas barrier 5 and the waterproof and gas permeable membrane 3 is greater than 50% of the total thickness of the oil and gas absorbing member 4, although the oil absorbing and blocking effects can be achieved, the amount of the oil absorbing and blocking air permeable pieces 4 distributed on one side of the oil blocking air permeable pieces 5 close to the cavity bottom 102 is small, and the oil absorbing effect of the air permeable valve can be reduced.

Example III

The difference between this embodiment and the first embodiment lies in that, this embodiment has all set up the oil-blocking ventilation piece 5 in the oil-absorbing ventilation piece 4 and between oil-absorbing ventilation piece 4 and waterproof ventilated membrane 3, thereby realize the effect of multilayer oil-blocking, can realize the secondary oil-blocking effect, can make the fluid that passes the oil-blocking ventilation piece 5 of first layer (set up in oil-absorbing ventilation piece 4) can be absorbed in time, can utilize the oil-blocking ventilation piece 5 of second layer (set up between oil-absorbing ventilation piece 4 and waterproof ventilated membrane 3) again to avoid oil-absorbing ventilation piece 4 and waterproof ventilated membrane 3 direct contact, and then influence waterproof ventilated membrane 3's life.

Example IV

Based on the above embodiments, in the preferred embodiment, a plurality of flow guiding strips 6 are provided at the bottom 102 of the accommodating cavity 101, and the plurality of flow guiding strips 6 are circumferentially arranged at the inlet 1021 of the bottom 102.

It should be noted that, if the guide strip 6 is not provided, the oil absorbing and ventilating piece 4 is easy to sink after absorbing oil, which can lead to a gap between the waterproof and ventilating film 3 and the oil blocking and ventilating piece 5, so that oil seeps out from the edge of the oil blocking and ventilating piece 5, and further the service life of the waterproof and ventilating film 3 can be reduced. Therefore, the plurality of guide strips 6 in the embodiment play a supporting role on the oil-absorbing and ventilating piece 4, and the support on the oil-absorbing and ventilating piece 4 is enhanced by arranging the guide strips 6 so as to prevent the oil-absorbing and ventilating piece 4 from sinking; at the same time, a diversion flow channel 7 is formed between two adjacent diversion strips 6. Moreover, if the guide strip 6 is not provided, the guide flow channel 7 is not formed at the inlet 1021 of the cavity bottom 102 of the accommodating cavity 101, so that the oil flowing to the accommodating cavity 101 cannot be split, a large amount of discharged oil can directly impact the oil-absorbing and air-permeable member 4, the oil-absorbing and air-permeable member 4 deforms and sinks under a large impact force, and a gap is formed between the waterproof and air-permeable membrane 3 and the oil-blocking and air-permeable member 5.

As shown in fig. 4, in this embodiment, the flow guiding flow channel 7 inclines from the edge 1022 of the cavity bottom 102 to the inlet 1021 of the cavity bottom 102, so as to perform a flow-dividing guiding function on the oil, so that the oil can diffuse from the inlet 1021 of the cavity bottom 102 to the edge 1022 of the cavity bottom 102 and be absorbed by the oil-absorbing and ventilating member 4, on one hand, the oil can be prevented from directly impacting the oil-absorbing and ventilating member 4, on the other hand, the oil can be uniformly absorbed by the oil-absorbing and ventilating member 4, and further sinking caused by overlarge local oil absorption in a short time of the oil-absorbing and ventilating member 4 is avoided.

Further, the inclined angle a is formed by the guide flow channel 7 and the extension line of the edge 1022 of the cavity bottom 102 (as shown in the extension line of the X direction in fig. 4), and the arrangement of the inclined angle a can guide the oil, so that the oil can flow more smoothly, and the problem that the inlet 1021 of the cavity bottom 102 is blocked due to the fact that a large amount of oil cannot flow into the guide flow channel 7 in time can be avoided. If the inclination angle is too small or the inclination angle is not set, the guiding effect is poor, if the inclination angle is too large, oil and gas are easily blocked at the inlet 1021 of the cavity bottom 102, so that a large impact force is generated on the oil-absorbing and ventilating member 4, and meanwhile, the oil absorption of the edge of the oil-absorbing and ventilating member 4 is reduced, so that the oil-absorbing and ventilating member 4 is easily deformed and sunk due to the excessively large local oil absorption in a short time, and as a preferable range of the inclination angle A can be set as follows: 10 DEG < A < 30 deg.

In the embodiment, the oil-absorbing and air-permeable member 4 may be made of aramid fiber, the air permeability of the oil-absorbing and air-permeable member 4 is not less than 2 times that of the oil-blocking and air-permeable member 5, the elastic modulus is 100-150 GPa, the tensile strength is 3-6 GPa, and in addition, the breaking elongation of the oil-absorbing and air-permeable member 4 is 2% -3%; due to the design of proper parameters such as oil absorption, ventilation and the like, the sinking of the aramid fiber after oil absorption can be effectively avoided, and further, the synchronous sinking of the oil-resistant ventilation piece 5 along with the aramid fiber can be avoided, and finally, the problem that oil passes through the side edge of the oil-resistant ventilation piece 5 and further causes pollution of the waterproof ventilation film 3 is solved. Of course, in other embodiments, the oil absorbing and ventilating member 4 may be made of other oil absorbing and ventilating materials, so as to achieve the oil absorbing effect without affecting its own ventilation, and it is most preferable to ensure that it is not easy to collapse and deform after oil absorption.

In this embodiment, the supporting surface 8 is formed by the plurality of flow guiding strips 6, and the supporting effect of the flow guiding strips 6 on the oil absorbing and ventilating piece 4 is better by controlling the ratio of the area of the supporting surface 8 to the area of the cavity bottom 102 of the accommodating cavity 101, so that the problem that a gap is formed between the oil blocking and ventilating piece 5 and the waterproof and ventilating film 3 or the flow guiding flow channel 7 is blocked due to collapse of the oil absorbing and ventilating piece 4 after absorbing oil is avoided.

Specifically, as shown in fig. 3, the ratio of the area of the supporting surface 8 to the area of the cavity bottom 102 of the accommodating cavity 101 is 0.3-0.7, so that the flow guiding strip 6 can not only split and guide the oil passing through the cavity bottom 102 of the accommodating cavity 101, but also form the supporting surface 8 to support the oil absorbing and ventilating piece 4.

As shown in fig. 3, in order to avoid that the oil flowing into the diversion flow passage 7 instantaneously is directly rushed to the edge 1022 of the cavity bottom 102 when the oil quantity is too large, the absorption rate of the oil absorption ventilation member 4 and the edge thereof are inconsistent, and if the oil absorption ventilation member 4 is full of oil, the oil may spread along the inner wall of the accommodating cavity 101 to the oil resistance ventilation member 5 and seep out from the edge of the oil resistance ventilation member 5, therefore, the width of the diversion flow passage 7 in the embodiment is gradually increased from the inlet 1021 of the cavity bottom 102 to the edge 1022 of the cavity bottom 102, the oil quantity flowing into the diversion flow passage 7 instantaneously is reduced, and the absorption rate of the oil absorption ventilation member 4 and the edge thereof on the oil is basically consistent.

Example five

Based on the above embodiments, the present embodiment improves the connection portion 11, specifically, as shown in fig. 2, the ratio of the inner diameter D1 of the channel 111 of the connection portion 11 to the inner diameter D2 of the accommodating cavity 101 is 0.15-0.35, and due to the proper size design, the problem that when the ratio of the inner diameter D1 of the channel 111 of the connection portion 11 to the inner diameter D2 of the accommodating cavity 101 is large, the amount of oil instantaneously entering the cavity bottom 102 of the accommodating cavity 101 is large and cannot be timely dispersed into each diversion flow channel 7, so that the oil is easy to impact the oil absorbing and ventilating member 4, and collapse and sinking of the oil absorbing and ventilating member 4 is caused; the problem that the air permeability is reduced due to the small area of the inlet 1021 of the chamber bottom 102 when the inner diameter D1 of the passage 111 of the connecting portion 11 is smaller than the inner diameter D2 of the accommodating chamber 101 is avoided.

In order to reduce the flow rate of the oil, the effective separation of the oil and the gas is facilitated, a labyrinth channel 113 can be arranged in the channel 111 of the connecting part 11, so that the flow rate of the oil is reduced, and the preliminary separation of the oil and the gas is facilitated.

As shown in fig. 2 and 4, the channel 111 of the connecting portion 11 has a plurality of protruding blocks 112 that are staggered with each other, so that the channel 111 of the connecting portion 11 has a labyrinth channel 113; specifically, the plurality of bumps 112 form two rows on the inner wall of the channel 111 of the connecting portion 11, the number of bumps 112 in each row is the same, and the distances between two adjacent bumps 112 are the same, and the bumps 112 in two rows are staggered to form a labyrinth channel 113.

Further, the number of the protrusions 112 is proportional to the diameter D1 of the channel 111 of the connecting portion 11, the axial distance h2 between two opposite protrusions 112 (the axial distance is the distance along the central axis of the channel 111 of the connecting portion 11 as shown in fig. 4) is inversely proportional to the diameter D1 of the channel 111 of the connecting portion 11, that is, the larger the diameter D1 of the channel 111 of the connecting portion 11 is, the larger the number of the protrusions 112 is, and the smaller the axial distance h2 between two opposite protrusions 112 is, so that the vortex formed by the oil passing through the labyrinth channel 113 is larger, the flow velocity of the oil is further reduced, and the oil and the gas are effectively separated preliminarily; the smaller the diameter D1 of the channel 111 of the connecting portion 11, the smaller the number of the protruding blocks 112, and the larger the axial distance h2 between two opposite protruding blocks 112, the larger vortex is avoided from being formed by the oil passing through the labyrinth channel 113, so as to block the channel 111 of the connecting portion 11, reduce the throughput of gas, and meanwhile, the formed vortex generates a certain suction force on the oil-absorbing and ventilating piece 4 (aramid fiber), so that the oil-absorbing and ventilating piece 4 (aramid fiber) deforms towards the labyrinth channel 113, and the oil-absorbing and ventilating piece 4 (aramid fiber) sinks.

Further, the distance h1 between the outlet of the labyrinth passage 113 and the inlet 1021 of the accommodating cavity 101 is 5.8-7.8 mm, and the outlet of the labyrinth passage 113 and the inlet 1021 of the accommodating cavity 101 are set to be a proper distance, so that on one hand, oil can be prevented from directly entering the cavity bottom 102 of the accommodating cavity 101 in a vortex manner, and further, the oil can be prevented from being unable to be dispersed to each diversion flow channel 7, and further, the inlet 1021 of the cavity bottom 102 of the accommodating cavity 101 is blocked or the oil absorbing and ventilating piece 4 is directly flushed; on the other hand, the condition that oil liquid flows into the cavity bottom 102 of the accommodating cavity 101 at a faster flow rate can be avoided, and the condition that the oil liquid generates larger impact force on the oil-absorbing and ventilating piece 4 can be avoided.

Further, the axial distance h2 (the distance along the central axis of the channel 111 of the connecting portion 11 shown in fig. 4) between the two mutually staggered protrusions 112 is 0.8-1.6 mm, and the suitable distance between the two mutually staggered protrusions 112 is set, so that on one hand, the problem that the oil generates larger vortex when flowing through the labyrinth channel 113, and then is blocked, and the gas passing rate is reduced, and on the other hand, the flow rate of the oil is reduced, and further, the sufficient separation of the oil and the gas is ensured.

As shown in fig. 4, one end of the connecting part 11 is provided with a connecting piece 12, and a plurality of treatment tips 121 for puncturing bubbles in oil are arranged on the connecting piece 12, so that the treatment tips 121 can perform pre-puncturing treatment on the oil entering the labyrinth passage 113, and the gas in the oil entering the labyrinth passage 113 is more beneficial to discharge.

Example six

Based on the above embodiment, in this embodiment, the air exhaust cavity 9 is formed between the waterproof and breathable film 3 and the valve cover 2, and the cavity wall of the air exhaust cavity 9 is provided with a plurality of air holes 91, so as to facilitate the air exhaust of this device.

Because the ventilation holes 91 are opened, in order to avoid the impact of liquid or pollutant on the waterproof and breathable film 3 directly, and further puncture the waterproof and breathable film 3, the waterproof and breathable effects are reduced, in one embodiment, the side wall of the ventilation hole 91 is radial from the inner wall to the outer wall of the ventilation cavity 9, so that liquid or pollutants can enter the ventilation valve obliquely when entering the ventilation valve through the ventilation hole 91, and the situation that the liquid or pollutants puncture the waterproof ventilation film 3 is prevented. As shown in fig. 1 and 2, at least two inclined surfaces 92 are symmetrically arranged on the side wall of the ventilation hole 91, the inclined surfaces 92 are distributed along the circumferential direction of the exhaust cavity 9, and an acute angle formed between the inclined surfaces 92 and a plane where the port 911 of the ventilation hole 91 is located can be set to be 30-80 °.

In order to ensure that the gas passing through the waterproof and breathable membrane 3 can pass through the ventilation holes 91 in time, and thus the ventilation effect of the waterproof and breathable membrane 3 is not affected, in one embodiment, the ventilation holes 91 can be arranged around the circumference of the exhaust cavity 9, the total area of the ports 911 of the ventilation holes 91 is not smaller than the ventilation area of the waterproof and breathable membrane 3, and further, more gas is prevented from being concentrated in the exhaust cavity 9, so that the pressure in the exhaust cavity 9 is too large to generate pressure on the oil-absorbing and breathable member 4, and the deformation of the oil-absorbing and breathable member 4 is easily caused.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (10)

1. The ventilation valve of the power system comprises a valve seat and a valve cover, and is characterized in that the valve seat comprises a containing part and a connecting part which are sequentially communicated to form a channel; the outlet of the containing part is provided with a waterproof and breathable film, the containing part is provided with a containing cavity filled with an oil absorption and breathable piece,

the accommodating cavity is also filled with at least one layer of oil-blocking air-permeable piece, and the oil-blocking air-permeable piece is in contact with the inner wall of the accommodating cavity; the oil-resistant air-permeable member is positioned in the oil-absorbing air-permeable member, and/or the oil-resistant air-permeable member is positioned between the oil-absorbing air-permeable member and the waterproof air-permeable membrane;

the bottom of the accommodating cavity is provided with a plurality of guide strips, the guide strips are annularly arranged at the circumference of the inlet of the bottom of the accommodating cavity, and the guide strips support the oil-absorbing and air-permeable piece;

and a diversion flow channel is formed between two adjacent diversion strips, and the diversion flow channel inclines from the edge of the cavity bottom to the inlet of the cavity bottom.

2. A power system ventilation valve according to claim 1, characterized in that the flow guide channel forms an angle of inclination a with the extension of the edge of the cavity floor, wherein 10 ° < 30 °.

3. The air permeable valve of a power system according to claim 1, wherein the air permeability of the oil absorbing and permeable member is not less than 2 times that of the oil blocking and permeable member, the elastic modulus is 100-150 GPa, and the tensile strength is 3-6 GPa.

4. The air permeable valve of a power system according to claim 1, wherein the distance between the oil-blocking air permeable member and the waterproof air permeable membrane is not more than 50% of the total thickness of the oil-absorbing air permeable member, and the thickness of the oil-blocking air permeable member is 2-5% of the total thickness of the oil-absorbing air permeable member;

the air permeability of the oil-resistant air permeable piece is 10-20 ml/min.mm ² 。

5. A power system ventilation valve as claimed in claim 1, wherein a plurality of said flow-guiding strips form a support surface, the ratio of the area of said support surface to the area of the bottom of said receiving chamber being between 0.3 and 0.7.

6. A power train ventilation valve according to claim 1, wherein the width of the flow guide channel increases in a gradient from the entrance of the chamber bottom to the edge of the chamber bottom.

7. A power system ventilation valve as claimed in claim 1, wherein the ratio of the internal diameter of the passage of the connection portion to the internal diameter of the receiving chamber is in the range of 0.15 to 0.35.

8. The ventilation valve of a power system according to claim 1, wherein the connecting portion has a plurality of protrusions arranged in a staggered manner in the passage, so that the connecting portion has a labyrinth passage in the passage;

the distance h1 between the outlet of the labyrinth passage and the inlet of the accommodating cavity is 5.8-7.8 mm.

9. A power system ventilation valve according to claim 8, characterized in that the axial distance h2 between two mutually staggered lugs is 0.8-1.6 mm.

10. The air ventilation valve of a power system according to claim 1, wherein an air exhaust cavity is formed between the waterproof air ventilation film and the valve cover, a cavity wall of the air exhaust cavity is provided with a plurality of air holes, and side walls of the air holes are radial from the inner wall to the outer wall of the air exhaust cavity.