Oil-proof assembly, oil-proof ventilation valve and device with oil tank

Abstract

The invention discloses an oil-proof assembly, an oil-proof ventilation valve and a device with an oil tank. The oil-proof assembly comprises a valve body, the middle of the valve body is provided with a cavity penetrating through the two ends of the valve body, the valve body comprises a first end and a second end, the first end is provided with an oil passing opening communicating the cavity with the outside, and the second end of the cavity is configured to be communicated with an external ventilation channel; the first filtering piece is arranged in the cavity of the first end; the limiting piece is arranged in the cavity of the second end and is provided with a through hole for ventilation; and the elastic piece is arranged between the first filtering piece and the limiting piece, and the elastic piece is configured to apply thrust to the filtering piece after the first filtering piece absorbs oil and expands, so that at least part of oil absorbed in the first filtering piece can be extruded out by the thrust of the elastic piece. According to the oil-proof assembly, the oil-proof ventilation valve and the device with the oil tank, the maintenance cost can be reduced, and the service life can be prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of oil prevention, and in particular to an oil prevention component, an oil prevention breathable valve, and a device with an oil tank. Background Art

[0002] Traditional devices with oil tanks, such as gear boxes (automobile reducers, transmissions or three-in-one oil-cooled motors), usually require oil-proof breathable valves to balance the pressure difference between the inside and outside of the box and prevent pollutants from entering the box. Currently, oil-proof breathable products on the market usually use valve bodies with filter elements to filter the oil gas or oil mist inside the box to prevent oil gas from accumulating on the surface of the waterproof breathable membrane and affecting the breathability of the waterproof breathable membrane.

[0003] However, as the use time goes by, the filter element will be saturated, which will not only lead to insufficient filtering effect, but also easily cause the filter element to have air permeability attenuation, affecting the performance of the product, and thus failing to meet the requirements of oil-proof and air-permeable. To ensure the filtering and air-permeable effect of the filter element, it is necessary to replace the filter element in time or actively drain the oil from the filter element. Whether it is replacing the filter element or actively draining the oil, frequent maintenance is required, which increases the maintenance cost of the oil-proof breathable valve. If the maintenance is not in place, it will reduce the service life of the oil-proof breathable valve and even the terminal product. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present application provides an oil-proof component, an oil-proof breathable valve and a device with an oil tank, which can increase the service life of the oil-proof component.

[0005] This application provides the following technical solutions:

[0006] In a first aspect, an oil-proof component is provided, the oil-proof component comprising:

[0007] A valve body, wherein a cavity is provided in the middle thereof and passes through both ends of the valve body, the valve body comprises a first end and a second end, an oil passage connecting the cavity with the outside is provided at the first end, and the cavity is configured to communicate with an external air permeable passage at the second end;

[0008] A first filter element, disposed in the cavity of the first end;

[0009] a stopper, disposed in the cavity of the second end, and provided with a through hole for ventilation; and

[0010] The elastic member is disposed between the first filter element and the limiting member, and the elastic member is configured so that when the first filter element expands after absorbing oil, at least part of the oil absorbed in the first filter element can be squeezed out by the thrust of the elastic member.

[0011] In one embodiment, the oil-proof component further comprises:

[0012] A first pressing plate, one side of which is in contact with the first filter element, the first pressing plate is provided with a plurality of first air holes, the first air holes being opposite to the first filter element; and

[0013] A plurality of steps are provided, wherein the steps are in contact with the other side of the first pressing plate, and a gap is formed between the oil passage port and the first pressing plate through the steps.

[0014] In one embodiment, guide grooves are provided between the steps and between the steps and the cavity wall of the cavity, and the first air vent is opposite to the guide grooves.

[0015] In one embodiment, the oil passage opening is a strip-shaped opening, one end of the guide groove is opposite to the strip-shaped opening, and a slope is provided between the guide groove and the oil passage opening.

[0016] In one embodiment, a first sealing ring is provided at the periphery of the first pressing plate, and the first pressing plate is abutted and sealed against the cavity wall of the cavity through the first sealing ring.

[0017] In one embodiment, the oil-proof component further comprises:

[0018] A second pressing plate, one side of which abuts against the first filter element, and the other side of which abuts against one end of the elastic element, the second pressing plate is provided with a plurality of second air holes, and the second air holes are opposite to the first filter element;

[0019] The second pressing plate and the limiting member are provided with a positioning structure in the middle for positioning the elastic member.

[0020] In one embodiment, a second sealing ring is provided at the periphery of the second pressing plate, and the second pressing plate is abutted and sealed against the cavity wall of the cavity through the second sealing ring.

[0021] In one embodiment, the oil-proof component further comprises:

[0022] A waterproof breathable membrane, disposed in the cavity of the second end and between the stopper and the breathable passage;

[0023] In one embodiment, the oil-proof component further comprises:

[0024] The second filter element is arranged between the limiting element and the air permeable passage.

[0025] In one embodiment, the oil-proof component comprises:

[0026] a waterproof breathable membrane, disposed in the cavity of the second end and between the stopper and the breathable passage; and

[0027] The partition plate has one side abutting against the second filter element and the other side abutting against one side of the waterproof breathable membrane. The partition plate is provided with a plurality of third air holes, and the third air holes are opposite to the second filter element.

[0028] In one embodiment, the diameter of the limiting element at a side close to the second filter element is larger than the diameter at a side close to the first filter element, and the diameter of the second filter element is larger than the diameter of the first filter element.

[0029] In one embodiment, the first filter element is a filter structure formed by stacking multiple filter elements.

[0030] In one embodiment, the elastic member is configured as follows:

[0031] When the first filter element does not absorb oil or expands after absorbing oil, and the thrust applied by the elastic element to the first filter element is less than a preset value, the oil in the first filter element is not squeezed out by the elastic element;

[0032] When the first filter element expands after absorbing oil, and the thrust applied by the elastic element to the first filter element is greater than or equal to a preset value, at least part of the oil in the first filter element is squeezed out by the elastic element.

[0033] In a second aspect, the present application further provides an oil-proof breathable valve, the oil-proof breathable valve comprising:

[0034] Oil-proof components; and

[0035] A protective cover is arranged at the second end of the valve body of the oil-proof component, and a vent passage is arranged between the protective cover and the valve body;

[0036] Wherein, the oil-proof component is an oil-proof component as described in any one of the above items.

[0037] In a third aspect, the present application further provides a device having a fuel tank, the device comprising:

[0038] Fuel tanks; and

[0039] An oil-proof breathable valve is installed on the oil tank, and the oil-proof breathable valve is the oil-proof breathable valve as described above.

[0040] As can be seen from the above, the oil-proof component, oil-proof breathable valve and device with an oil tank provided by the present application are provided with a first filter and a limiter, and an elastic member is provided between the limiter and the first filter. When the oil gas or oil mist enters the cavity of the valve body through the oil port, the volume of the first filter expands after absorbing the oil gas or oil mist, and the elastic member applies a thrust to the first filter. When the first filter expands to a certain extent, the elastic member can automatically squeeze out the excess oil in the first filter, and it can flow back through the oil port of the valve body. The oil-proof component can avoid the problem of the first filter being too saturated and affecting its filtering and breathability performance, and does not require frequent maintenance, which reduces the maintenance cost of the oil-proof component, the oil-proof breathable valve and the device with an oil tank, and can extend their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the explosion-proof structure of the oil-proof component provided in an embodiment of the present application.

[0042] Figure 2 A schematic cross-sectional view of a portion of the structure of the oil-proof structure provided in an embodiment of the present application.

[0043] Figure 3 Another schematic cross-sectional view of a partial structure of the oil-proof structure provided in an embodiment of the present application.

[0044] Figure 4 A schematic structural diagram from an exploded perspective of part of the structure of the oil-proof component provided in an embodiment of the present application.

[0045] Figure 5 This is a schematic overall cross-sectional view of the oil-proof structure provided in an embodiment of the present application.

[0046] Figure 6 A schematic diagram of the structure of the oil-proof component provided in an embodiment of the present application from another explosion perspective.

[0047] Figure 7 A schematic diagram of the structure of the oil-proof breathable valve provided in an embodiment of the present application.

[0048] Figure 8 A schematic structural diagram of a device with a fuel tank provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments of the present application are provided in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0050] Please refer to Figure 1 , Figure 1 The explosion perspective structure of the oil-proof component provided in an embodiment of the present application is shown in FIG.

[0051] like Figure 1 As shown, the oil-proof structure includes a valve body 1 , a first filter element 2 , a limit element 3 and an elastic element 4 .

[0052] The middle part of the valve body 1 is provided with a cavity 11 which passes through both ends of the valve body 1. The valve body 1 includes a first end 1a and a second end 1b. The first end 1a is provided with an oil port 12 which connects the cavity 11 with the outside. The cavity 11 is configured to communicate with an external air permeable channel at the second end 1b.

[0053] The material of the valve body 1 can be metal or plastic to ensure the structural strength of the valve body 1. The valve body 1 can be installed on the box body of the oil tank by providing a mounting structure at the first end 1a or the second end 1b. For example, the outer side of the first end 1a can be provided with a thread for connecting and fixing with the box body of the oil tank. Of course, the valve body 1 can also be fixed to the box body of the oil tank by providing a screw hole at the second end 1b. The specific fixing method is not limited in this application.

[0054] Among them, the first end 1a of the valve body 1 can be used to be installed on the box body of the oil tank or inside the box body, and the oil gas, oil mist or liquid oil inside the oil tank can enter the cavity 11 of the valve body 1 through the oil port 12 set at the first end 1a of the valve body 1, or re-enter the oil tank from the cavity 11 through the oil port 12.

[0055] The second end 1b of the valve body 1 can be arranged on the body of the oil tank or outside the body. The cavity 11 at the second end 1b of the valve body 1 can be used to connect with the external air permeable passage, so that the gas inside the oil tank is communicated with the external air permeable passage through the cavity 11. Specifically, the valve body 1 can be provided with an opening at the second end 1b, and the cavity 11 is communicated with the outside through the opening, so as to ensure that the inside of the body of the oil tank is ventilated with the outside through the cavity 11 of the valve body 1.

[0056] The first filter element 2 is disposed in the cavity 11 of the first end 1a. Specifically, the diameter of the first filter element 2 is adapted to the diameter of the cavity 11, so that the oil gas, oil mist or liquid oil entering the cavity 11 through the oil port 12 can be absorbed, so that the gas discharged from the air permeable channel is substantially free of oil gas, oil mist or liquid oil, thereby achieving an oil-proof effect.

[0057] In some embodiments, the first filter element 2 can be made of oil-absorbing material, such as sponge, fiber or other single or composite materials. In order to improve the adsorption effect on oil gas, oil mist or liquid oil, the first filter element 2 can adopt a filter structure formed by stacking filter elements made of multiple pieces of oil-absorbing materials. The oil gas, oil mist or liquid oil in the gas will contact the outermost filter element, and the first filter element 2 will absorb it in a saturated manner in layers, so that the first filter element 2 can obtain a more uniform absorption effect. In addition, the stacked filter structure can greatly increase the contact area between the filter element and the substance to be filtered, and increase the adsorption area for oil gas, oil mist or liquid oil. In addition, through the stacked setting, the first filter element 2 can improve the flow of fluid between layers, form a flow channel or vortex, which is conducive to the full contact between the fluid and the first filter element 2 and improve the adsorption efficiency.

[0058] Furthermore, the first filter element 2 can also add adsorbents for oil gas, oil mist or liquid oil to improve the adsorption effect, and the stacked filter structure is adopted to make the adsorbent more evenly distributed in the filter block. As the fluid flows between the layers, it can ensure that each part of the adsorbent can fully exert the adsorption effect, avoiding the situation where the adsorbent is overused or underused locally, thereby improving the utilization rate of the adsorbent in the entire filter block. It is understandable that the adsorbent can use existing known adsorbents for oil gas, oil mist or liquid oil, and this application does not list them one by one.

[0059] It is relatively difficult to achieve the combination and optimization of different adsorbents for the whole adsorption filter block. Often, only a single type of adsorbent can be used, which makes it difficult to meet the requirements of efficient adsorption of multiple substances of different properties at the same time. In one embodiment, adsorbents of different types or properties can be placed in different layers according to different adsorption requirements. For example, the first layer can be filled with adsorbents that have a better adsorption effect on larger particles, and the second layer can be filled with adsorbents that have a highly selective adsorption effect on specific chemical components. Through this combination, more targeted and efficient adsorption can be performed on complex mixed substances, thereby improving the comprehensive adsorption performance of the filter block.

[0060] The stopper 3 is disposed in the cavity 11 of the second end 1b, and the stopper 3 is provided with a through hole 31 for ventilation. The elastic member 4 is disposed between the first filter element 2 and the stopper 3, and the elastic member 4 is configured such that when the first filter element 2 absorbs oil and expands, the elastic member 4 applies a thrust to the filter element, so that at least part of the oil absorbed in the first filter element 2 can be squeezed out by the thrust of the elastic member 4. In one embodiment, the elastic member 4 can be a spring or a material with elastic deformation function, such as rubber, etc., which is not limited in the present application.

[0061] The stopper 3 abuts against the cavity wall of the cavity 11, and limits the elastic member 4 to a certain space between the first filter element 2 and the stopper 3. When the first filter element 2 is in a state of not absorbing oil, the elastic member 4 can be set to a pre-compressed state or an uncompressed state. When the first filter element 2 absorbs oil and expands, the volume will increase due to the absorption of oil gas, oil mist or liquid oil. At this time, the expanded first filter element 2 will squeeze the elastic member 4, and the elastic member 4 will also apply a certain thrust to the first filter element 2.

[0062] When the oil in the first filter element 2 is not saturated and the thrust applied by the elastic member 4 to the first filter element 2 is less than a preset value, the thrust of the elastic member 4 on the first filter element 2 is insufficient to offset the thrust applied by the expansion of the first filter element 2 on the elastic member 4. At this time, the oil in the first filter element 2 cannot be squeezed out by the elastic member 4, and the first filter element 2 continues to absorb oil gas, oil mist or liquid oil, the elastic member 4 continues to be further compressed, and the thrust of the elastic member 4 on the first filter element 2 continues to increase.

[0063] When the oil in the first filter element 2 is saturated to a certain extent, and the thrust applied by the elastic member 4 to the first filter element 2 is greater than or equal to a preset value, the thrust of the compressed elastic member 4 on the first filter element 2 is greater than or equal to the thrust applied by the first filter element 2 to the elastic member 4 due to the expansion of the first filter element 2. At this time, the first filter element 2 cannot further absorb the oil and expand, and at least part of the oil in the first filter element 2 will be squeezed out by the elastic member 4. In some cases, the squeezed oil can flow back into the oil tank through the oil port 12.

[0064] The oil-proof component is provided with an elastic member 4, which can exert a certain thrust on the first filter element 2 when it reaches a certain saturation level, and can squeeze out the excess oil in the first filter element 2, so as to prevent the first filter element 2 from further absorbing oil and affecting the filtering and air permeability efficiency, so that the first filter element 2 will not be in an oversaturated state, thereby ensuring the filtering and air permeability performance of the oil-proof component.

[0065] In one embodiment, the preset value may be set to 6-15 N. The preset value may be slightly lower than the thrust on the elastic member 4 formed when the first filter element 2 is fully saturated, so that the first filter element 2 always maintains an unsaturated state.

[0066] Of course, the preset value can also be set so that the oil in the first filter element 2 will be squeezed out only when the thrust of the compressed elastic member 4 on the first filter element 2 is greater than the thrust applied to the elastic member 4 by the expansion of the first filter element 2. The preset value can be determined according to different filter materials, and the elastic modulus of the elastic member 4 can be adjusted according to the actual measurement results, so that when the first filter element 2 reaches a certain saturation, the thrust of the elastic member 4 on it can be greater than or equal to the preset value, and the elastic member 4 can smoothly squeeze out the excess oil absorbed by the first filter element 2.

[0067] See also Figure 2-3 The figure shows a partial structural cross section of the oil-proof structure provided in an embodiment of the present application and a schematic diagram of another cross section.

[0068] like Figure 2-3 As shown, the oil-proof structure has Figure 1 In addition to the structure in FIG. 1 , the first pressing plate 5 and a plurality of steps 13 are also included.

[0069] One side of the first pressing plate 5 abuts against the first filter element 2, and the other side abuts against the step 13. The first pressing plate 5 is provided with a plurality of first air holes 51, and the first air holes 51 are opposite to the first filter element 2. Moreover, a blank area is formed between the oil port 12 and the first pressing plate 5 through the step 13.

[0070] The first pressing plate 5 is in contact with one side of the first filter element 2, and its diameter is matched with the diameter inside the cavity 11, so that the periphery of the first pressing plate 5 can be in contact with the inner wall of the cavity 11. In addition, the first air hole 51 is opposite to the position of the first filter element 2, so that the oil gas, oil mist or liquid oil can enter the first filter element 2 through the first air hole 51, or the gas or oil in the first filter element 2 is discharged from the first air hole 51, so as to improve the filtering performance of the oil-proof component. A blank area is formed between the oil port 12 and the first pressing plate 5 through the step 13. After the gas enters the blank area of ​​the cavity 11 through the oil port 12, it enters the first filter element 2 through each first air hole 51, which can improve the air permeability of the oil-proof component. It can be understood that the number of the first air holes 51 can be multiple, and the specific number can be determined according to actual needs.

[0071] In one embodiment, a guide groove 14 is provided between the steps 13 and between the steps 13 and the cavity wall of the cavity 11, and the first air hole 51 is opposite to the guide groove 14. In addition to providing gas inflow into the oil tank, the first air hole 51 also provides oil squeezed out by the elastic member 4 to flow out. The oil squeezed out by the elastic member 4 can flow into the guide groove 14 through the first air hole 51, and finally flow back to the oil tank from the oil port 12 through the guide groove 14. The design of the guide groove 14 can ensure the reflux effect of the squeezed oil and prevent the oil from accumulating in the cavity 11 and affecting the air permeability.

[0072] Furthermore, the oil passage port 12 is a strip-shaped port, one end of the guide groove 14 is opposite to the strip-shaped port, and a slope 15 is provided between the guide groove 14 and the oil passage port 12. The oil passage port 12, which is provided as a strip-shaped port, can prevent excessive oil gas, oil mist or liquid oil in the oil tank from entering the cavity 11 of the valve body 1, thereby affecting the service life of the first filter element 2. In addition, a slope 15 is provided between the guide groove 14 and the oil passage port 12, which can better discharge the liquid oil in the guide groove 14 through the oil port 12, ensure the filtering and air permeability performance of the oil-proof component, and extend its service life. Of course, the shape of the oil passage port 12 is not only a strip, but can also be set to a rectangular, triangular or circular shape, which can play the role of reducing the oil gas, oil mist or liquid oil from entering the interior of the valve body 1.

[0073] See also Figure 4 , the figure shows the exploded perspective structure of part of the structure of the oil-proof component provided in an embodiment of the present application.

[0074] like Figure 4 As shown, the oil-proof component Figure 1-3 In addition to the structure shown, the second pressing plate 6, the first sealing ring 52 and the second sealing ring 62 may also be included. One side of the second pressing plate 6 abuts against the first filter element 2, and the other side abuts against one end of the elastic member 4. The second pressing plate 6 is provided with a plurality of second air holes 61, and the second air holes 61 are opposite to the first filter element 2. Similar to the first pressing plate 5, the second air holes 61 of the second pressing plate 6 can guide the gas in the first filter element 2 to be discharged through the second air holes 61, or the gas at the second end can enter the first filter element 2 from the second air holes 61, so as to improve the filtering and air permeability performance of the first filter element 2.

[0075] In one embodiment, the second pressing plate 6 and the stopper 3 are provided with a positioning structure in the middle for positioning the elastic member 4. By providing the positioning structure, the elastic member 4 can act on the middle of the second pressing plate 6, and cooperate with the abutting effect of the second pressing plate 6 on the first filter 2, so as to improve the uniformity of the thrust applied by the elastic member 4 to the first filter 2 through the second pressing plate 6, thereby improving the oil extrusion effect on the first filter 2. Further, if the oil discharge assembly is provided with a first pressing plate 5, one side of the first pressing plate 5 abuts against the bottom of the first end, and the second pressing plate 6 abuts against the elastic member 4, so that when the elastic member 4 applies thrust to the second pressing plate 6, the first filter 2 is simultaneously subjected to the forces of the first pressing plate 5 and the second pressing plate 6, so as to obtain a better effect of discharging excess oil in the first filter 2.

[0076] In another embodiment, a first sealing ring 52 may be provided at the periphery of the first pressing plate 5, and the first pressing plate 5 is sealed against the cavity wall of the cavity 11 through the first sealing ring 52. There will inevitably be gaps between the first pressing plate 5 and the cavity wall of the cavity 11, and between the first filter element 2 and the cavity wall of the cavity 11 due to manufacturing errors. The first sealing ring 52 can prevent oil gas, oil mist or liquid oil from directly passing through the gaps between the first pressing plate 5 and the cavity wall of the cavity 11, and between the first filter element 2 and the cavity wall of the cavity 11 for discharge, which can improve the filtering effect of the gas entering the valve body 1. Furthermore, if a waterproof breathable membrane 8 is provided on the second end of the valve body 1, the provision of the first sealing ring 52 can also improve the service life of the waterproof breathable membrane 8, thereby improving the service life of the oil-proof breathable valve as a whole.

[0077] In another embodiment, if the oil-proof component is provided with a second pressing plate 6, a second sealing ring 62 is provided at the periphery of the second pressing plate 6, and the second pressing plate 6 is sealed against the cavity wall of the cavity 11 through the second sealing ring 62. The function of the second sealing ring 62 can refer to the function of the first sealing ring 52, and is used to improve the service life of the oil-proof breathable valve as a whole. Of course, in actual applications, a sealing ring can be provided only on the first pressing plate 5 or the second pressing plate 6, or on both the first pressing plate 5 and the second pressing plate 6, depending on actual needs.

[0078] Please refer to Figures 5-6, which show the overall cross-sectional structure of the oil-proof structure provided in an embodiment of the present application and another explosion-view structure.

[0079] like Figure 5-6 As shown, the oil-proof structure includes a valve body 1 , a first filter element 2 , a limit element 3 and an elastic element 4 .

[0080] The middle part of the valve body 1 is provided with a cavity 11 which passes through both ends of the valve body 1. The valve body 1 includes a first end and a second end. The first end is provided with an oil passage 12 which connects the cavity 11 with the outside. The cavity 11 is configured to communicate with the external air permeable passage at the second end. The first filter element 2, the elastic element 4 and the stopper 3 are all arranged in the cavity 11 in sequence. The elastic element 4 is configured so that when the first filter element 2 absorbs oil and expands, the elastic element 4 applies a thrust to the filter element, so that at least part of the oil absorbed in the first filter element 2 can be squeezed out by the thrust of the elastic element 4.

[0081] Specifically, the oil-proof structure also includes a first pressing plate 5 and a second pressing plate 6. The first pressing plate 5 abuts against the cavity wall of the cavity 11 through a first sealing ring 52, and the second pressing plate 6 abuts against the cavity wall of the cavity 11 through a second sealing ring 62. When the first filter element 2 absorbs oil and expands to a certain saturation level, and the thrust of the elastic member 4 on the first filter element 2 through the second pressing plate 6 reaches a preset value, the excess oil in the first filter element 2 will be squeezed out, and the squeezed oil flows out through the first air hole 51 and the oil port 12 in the first pressing plate 5, so that the first filter element 2 will not be in an oversaturated state, ensuring the filtering and air permeability of the first filter element 2 in the oil-proof assembly. Further, the first sealing ring 52 can be sleeved on the periphery of the first pressing plate 5, and the second sealing ring 62 can be sleeved on the periphery of the second pressing plate 6, so as to improve the filtering effect through the first sealing ring 52 and the second sealing ring 62. Of course, the first sealing ring 52 and the second sealing ring 62 can be used alone or simultaneously according to needs.

[0082] In this embodiment, in order to improve the reliability of the ventilation function of the oil-proof component, the oil-proof component further includes a second filter 7 and a waterproof breathable membrane 8. The waterproof breathable membrane 8 is arranged in the cavity 11 of the second end and is located between the stopper 3 and the ventilation channel. The waterproof breathable membrane 8 can be made of e-PTFE or other membrane materials that can achieve waterproof and breathable functions. By providing the waterproof breathable membrane 8, it is possible to prevent external dust or water vapor from entering the valve body 1 and affecting the oil absorption performance of the filter while ensuring the oil-proof function.

[0083] The second filter 7 is disposed between the stopper 3 and the external air permeable passage, and between the stopper 3 and the waterproof breathable membrane 8. The second filter 7 can further filter and absorb the oil gas, oil mist or liquid oil in the gas filtered by the first filter 2 to ensure the oil-proof effect. It can also prevent the oil gas, oil mist or liquid oil from affecting the waterproof breathable membrane 8, thereby increasing the service life of the waterproof breathable membrane 8.

[0084] In one embodiment, the diameter of the stopper 3 on the side close to the second filter element 7 is larger than the diameter on the side close to the first filter element 2, and the diameter of the second filter element 7 is larger than the diameter of the first filter element 2. Through the design of the above-mentioned stopper 3, the oil gas, oil mist or liquid oil that still exists after filtering by the first filter element 2 can be in contact with the second filter element 7 as much as possible, and will not flow out of the second filter element 7 from the gap between the second filter element 7 and the cavity wall of the cavity 11, resulting in an impact on the oil-proof effect. In addition, the through holes 31 in the stopper 3 can all be opposite to the second filter element 7, thereby improving the filtering effect of the second filter element 7 on oil gas, oil mist or liquid oil.

[0085] Similarly, the diameter of the second filter element 7 will be larger than that of the first filter element 2, thereby further improving the filtering effect of the second filter element 7. It can be understood that the diameters of the first filter element 2 and the second filter element 7 can be determined according to actual needs, and this application does not limit this.

[0086] In order to further improve the service life of the waterproof breathable membrane 8, a partition 9 is provided between the waterproof breathable membrane 8 and the second filter element 7, one side of the partition 9 abuts against the second filter element 7, and the other side abuts against one side of the waterproof breathable membrane 8. The partition 9 is provided with a plurality of third air holes, and the third air holes are opposite to the second filter element 7. The partition 9 can separate the waterproof breathable membrane 8 from the second filter element 7 to prevent the oil absorbed in the second filter element 7 from contaminating the waterproof breathable membrane 8. Furthermore, the third air holes of the partition 9 can be set to holes with larger proportions to minimize the influence of the third air holes on the air permeability.

[0087] A protective cover 10 is also provided outside the second end of the valve body 1. The protective cover 10 places the waterproof breathable membrane 8 inside the valve body 1 to prevent external dust and sand from entering the valve body 1, thereby increasing the service life of the waterproof breathable membrane 8 and other internal structures. A gap or groove may be left between the protective cover 10 and the valve body 1, thereby forming a breathable channel between the protective cover 10 and the valve body 1, and the oil-proof structure may have an oil-proof breathable effect through the breathable channel.

[0088] At the same time, the first filter element 2 and the second filter element 7 both adopt a filter structure formed by stacking multiple filter elements. The filter structure formed by stacking can improve the filtering performance. Of course, the first filter element 2 and the second filter element 7 can also adopt a whole piece of filter material, which can be determined according to actual needs, and this application does not limit this.

[0089] The exterior of the valve body 1 may also be provided with external threads and a mounting seal 16, which can ensure that the valve body 1 and the oil tank are in a sealed state when the valve body 1 is installed on the oil tank, and are easy to disassemble and use.

[0090] Through the above design, the gas, liquid oil and other substances carrying oil gas or oil mist in the oil tank enter the cavity 11 through the oil hole of the valve body 1, and are filtered twice by the first filter element 2 and the second filter element 7 in turn, thereby realizing the oil-proof function. At the same time, the waterproof and breathable membrane 8 can cooperate with the first filter element 2 and the second filter element 7 to realize the breathable function of the oil-proof component.

[0091] During operation, when the oil in the first filter element 2 is not saturated and the thrust applied by the elastic member 4 to the first filter element 2 is less than a preset value, the thrust of the elastic member 4 on the first filter element 2 is insufficient to offset the thrust applied by the first filter element 2 to the elastic member 4 due to the expansion of the first filter element 2. At this time, the oil in the first filter element 2 cannot be squeezed out by the elastic member 4, and the first filter element 2 continues to absorb oil gas, oil mist or liquid oil, the elastic member 4 continues to be further compressed, and the thrust of the elastic member 4 on the first filter element 2 continues to increase. When the oil in the first filter element 2 is saturated to a certain extent and the thrust applied by the elastic member 4 to the first filter element 2 is greater than or equal to the preset value, the thrust of the compressed elastic member 4 on the first filter element 2 is greater than or equal to the thrust applied by the first filter element 2 to the elastic member 4 due to the expansion of the first filter element 2. At this time, the first filter element 2 cannot further absorb oil and expand, and at least part of the oil in the first filter element 2 will be squeezed out by the elastic member 4. In some cases, the squeezed oil can flow back into the oil tank through the oil port 12.

[0092] From the above, it can be seen that the design of the oil-proof component can avoid the problem of the first filter element 2 being over-saturated and affecting its filtering and breathability performance, while meeting the oil-proof and breathability requirements of the equipment, without the need for frequent maintenance, thereby reducing the maintenance cost of the oil-proof component, the oil-proof breathable valve and the device with an oil tank, and extending its service life.

[0093] See also Figure 7 , the figure shows the structure of the oil-proof breathable valve provided in an embodiment of the present application.

[0094] like Figure 7 As shown, the oil-proof breathable valve includes an oil-proof component 20 and a protective cover 10. The protective cover 10 is arranged at the second end of the valve body of the oil-proof component 20, and the breathable passage is arranged between the protective cover 10 and the valve body. The protective cover 10 places a waterproof breathable membrane inside the valve body to prevent external dust and mud from entering the valve body, which can increase the service life of the internal structure of the valve body. A gap or groove can be left between the protective cover 10 and the valve body, so as to form a breathable passage between the protective cover 10 and the valve body, and the breathable passage can make the oil-proof structure have an oil-proof breathable effect.

[0095] The oil-proof component 20 may include a valve body, a first filter element, a limiter and an elastic element. After the first filter element expands to a certain extent, the elastic element can automatically squeeze out excess oil in the first filter element, and the oil can flow back through the oil port of the valve body, thereby avoiding the problem of the first filter element being over-saturated and affecting its filtering and air permeability performance. Frequent maintenance is not required, which reduces the maintenance cost of the oil-proof air valve and prolongs its service life.

[0096] In addition, the oil-proof breathable valve may also include an external thread 17 and a mounting seal 16, which can ensure that the valve body is in a sealed state with the oil tank when the valve body is mounted on the oil tank, and facilitate disassembly and assembly. Of course, the oil-proof breathable valve may also include other structures, which are not further limited here.

[0097] The specific structure of the oil-proof component 20 can be referred to Figure 1-6 The specific structure of the oil-proof component 20 will not be described in detail in any embodiment.

[0098] See also Figure 8 , the figure shows the structure of a device with an oil tank provided in an embodiment of the present application.

[0099] Among them, the device 100 with an oil tank may include an oil tank and an oil-proof breathable valve 200. The device 100 with an oil tank may be a gear box, such as an automobile reducer, a transmission or an oil tank of a three-in-one oil-cooled motor, etc., or may be other oil tanks loaded with oil liquids. The present application does not limit the type of the oil tank and the oil liquid contained therein.

[0100] Furthermore, the device 100 with a fuel tank may include a gear, a rack or other mechanical mechanism that uses the oil liquid in the fuel tank, and the specific mechanical structure type is not limited. Of course, the device 100 with a fuel tank may also be a car, a ship or other device 100 with a fuel tank and its power system.

[0101] The oil-proof breathable valve 200 can be referred to as Figure 1-7 The description of the oil-proof component in any embodiment and the oil-proof breathable valve 200 constituted by it, for example, includes components such as the valve 200 body, the first filter element, the limit element and the elastic element, so as to achieve the oil-proof breathable effect through the above-mentioned oil-proof component, and no further limitation is made here.

[0102] When the device 100 with an oil tank adopts the oil-proof breathable valve 200 in the embodiment of the present application, it can also reduce maintenance to reduce maintenance costs and improve the technical effect of oil-proof breathability. In addition, the oil-proof breathable valve 200 can also utilize its oil-proof breathable function to reduce the risk of equipment explosion, thereby improving the reliability of the device 100.

[0103] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0104] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0105] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0106] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0107] The above contents are merely examples and explanations of the structure of the present application, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present application, and these obvious replacement forms all belong to the protection scope of the present application.

Claims

1. An oil-proof component, characterized in that: The oil-proof component comprises: A valve body, wherein a cavity is provided in the middle thereof and passes through both ends of the valve body, the valve body comprises a first end and a second end, an oil passage connecting the cavity with the outside is provided at the first end, and the cavity is configured to communicate with an external air permeable passage at the second end; A first filter element, disposed in the cavity of the first end; a stopper, disposed in the cavity of the second end, and provided with a through hole for ventilation; and The elastic member is disposed between the first filter element and the limiting member, and the elastic member is configured so that when the first filter element expands after absorbing oil, at least part of the oil absorbed in the first filter element can be squeezed out by the thrust of the elastic member.

2. The oil-proof assembly according to claim 1, characterized in that: The oil-proof component also includes: A first pressing plate, one side of which is in contact with the first filter element, the first pressing plate is provided with a plurality of first air holes, the first air holes being opposite to the first filter element; and A plurality of steps are provided, wherein the steps are in contact with the other side of the first pressing plate, and a gap is formed between the oil passage port and the first pressing plate through the steps.

3. The oil-proof assembly according to claim 2, characterized in that: A guide groove is provided between the steps and between the steps and the cavity wall of the cavity, and the first air vent is opposite to the guide groove.

4. The oil-proof assembly according to claim 3, characterized in that: The oil passage opening is a strip-shaped opening, one end of the guide groove is opposite to the strip-shaped opening, and a slope is provided between the guide groove and the oil passage opening.

5. The oil-proof assembly according to claim 2, characterized in that: A first sealing ring is provided at the periphery of the first pressing plate, and the first pressing plate is abutted and sealed against the cavity wall of the cavity through the first sealing ring.

6. The oil-proof assembly according to claim 1, characterized in that: The oil-proof component also includes: A second pressing plate, one side of which abuts against the first filter element, and the other side of which abuts against one end of the elastic element, the second pressing plate is provided with a plurality of second air holes, and the second air holes are opposite to the first filter element; The second pressing plate and the limiting member are provided with a positioning structure in the middle for positioning the elastic member.

7. The oil-proof assembly according to claim 6, characterized in that: A second sealing ring is provided at the periphery of the second pressing plate, and the second pressing plate is abutted and sealed against the cavity wall of the cavity through the second sealing ring.

8. The oil-proof assembly according to claim 1, characterized in that: The oil-proof component also includes: The waterproof and breathable membrane is arranged in the cavity of the second end and is located between the limiting member and the breathable passage.

9. The oil-proof assembly according to claim 1, characterized in that: The oil-proof component also includes: The second filter element is arranged between the limiting element and the air permeable passage.

10. The oil-proof assembly according to claim 9, characterized in that The oil-proof component also includes: a waterproof breathable membrane, disposed in the cavity of the second end and between the stopper and the breathable passage; and The partition plate has one side abutting against the second filter element and the other side abutting against one side of the waterproof breathable membrane. The partition plate is provided with a plurality of third air holes, and the third air holes are opposite to the second filter element.

11. The oil-proof assembly according to claim 8, characterized in that The diameter of the limiting element at a side close to the second filter element is larger than the diameter at a side close to the first filter element, and the diameter of the second filter element is larger than the diameter of the first filter element.

12. The oil-proof component according to any one of claims 1 to 11, characterized in that: The first filter element is a filter structure formed by stacking multiple filter elements.

13. The oil-proof component according to any one of claims 1 to 11, characterized in that: The elastic member is configured as follows: When the first filter element does not absorb oil or expands after absorbing oil, and the thrust applied by the elastic element to the first filter element is less than a preset value, the oil in the first filter element is not squeezed out by the elastic element; When the first filter element expands after absorbing oil, and the thrust applied by the elastic element to the first filter element is greater than or equal to a preset value, at least part of the oil in the first filter element is squeezed out by the elastic element.

14. An oil-proof breathable valve, characterized in that: The oil-proof breathable valve comprises: Oil-proof components; and A protective cover is arranged at the second end of the valve body of the oil-proof component, and a vent passage is arranged between the protective cover and the valve body; Wherein, the oil-proof component is the oil-proof component as described in any one of claims 1-13.

15. A device having a fuel tank, characterized in that: The device comprises: Fuel tanks; and An oil-proof breathable valve is installed on the oil tank, and the oil-proof breathable valve is the oil-proof breathable valve as claimed in claim 14.

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