Wind power hydraulic oil pressure filter

Abstract

This invention provides a pressure-resistant filter for wind power hydraulic oil, belonging to the technical field of hydraulic filtration equipment. It includes a base, a sealing shell, a supporting shell, an inner filter element, and a guide spiral. The supporting shell is disposed within the sealing shell, forming an annular gap. The guide spiral is disposed within the annular gap, forming a centrifugal channel. The inner wall of the sealing shell has a filter groove for accommodating large particulate impurities that move outward due to centrifugal force. By setting a guide spiral within the sealing shell to form an upward-spiraling centrifugal channel, and correspondingly, a filter groove on the inner wall of the sealing shell, the oil flows spirally upward along the centrifugal channel under the guidance of the guide spiral. The high-speed rotation generates centrifugal force, throwing large particulate impurities in the oil towards the inner wall of the sealing shell, where they fall into the filter groove and are trapped, completing centrifugal separation and preventing them from entering subsequent filter elements.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic filtration equipment, specifically referring to a wind power hydraulic oil pressure-resistant filter. Background Technology

[0002] The wind turbine hydraulic system mainly undertakes key functions such as pitch control, yaw drive, main shaft braking and locking. It transmits power through high-pressure oil to achieve precise mechanical movements. The hydraulic oil is the working medium of the system, which not only transmits pressure and energy, but also lubricates, prevents rust, seals and dissipates heat from moving parts. Its cleanliness and wear resistance are directly related to the safe and stable operation of the wind turbine.

[0003] Hydraulic oil filters are connected in series in the oil circulation loop to intercept and purify solid particles, oxidized colloids, and wear debris in the hydraulic oil, ensuring that the oil continuously meets the requirements for high cleanliness. They can effectively protect precision hydraulic components such as pitch pumps, proportional valves, and brake cylinders from abrasive corrosion and jamming, significantly reducing the risk of system failures and downtime caused by oil contamination. They are key to extending the service life of hydraulic oil and ensuring the stable operation of the blower.

[0004] Currently, hydraulic filters include single-stage and multi-stage filters. Existing single-stage filters use high-mesh filter elements, where particles of all sizes are intercepted by the same element. This leads to large particles quickly clogging the surface, resulting in short filter element life and frequent replacements. While multi-stage filters extend the life of fine filter elements by using filter elements of different mesh sizes, they have higher structural costs. Furthermore, once the primary filter element becomes clogged, the overall system flow resistance increases, and the filtration flow rate drops sharply, making it difficult to meet the high-pressure, high-flow instantaneous oil supply demands of wind power hydraulic systems. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a wind power hydraulic oil pressure-resistant filter, so as to at least partially solve the problems mentioned in the background art.

[0006] The technical solution adopted by this invention is as follows: This invention proposes a wind power hydraulic oil pressure-resistant filter, comprising: The base has an internal oil inlet channel and an oil outlet channel; A sealing shell is installed on the base, and a filter chamber is formed inside it; A support housing is disposed inside the sealing housing and forms an annular gap with the sealing housing. The oil inlet channel communicates with the annular gap, and the oil outlet channel communicates with the internal space of the support housing. An inner filter element is coaxially disposed inside the support housing, and the inner filter element has a top opening; A guide spiral is disposed within the annular gap, forming a centrifugal channel within the annular gap, for guiding the oil entering from the oil inlet channel to flow upward along the spiral path and generate rotational centrifugal force; The inner wall of the sealing shell is provided with a filter groove for accommodating large particulate impurities that move outward due to centrifugal force.

[0007] Furthermore, the filter groove is a strip-shaped groove extending axially along the sealing shell.

[0008] Furthermore, the cross-sectional shape of the filter groove is V-shaped, trapezoidal, or rectangular, and the opening of the filter groove faces the outer wall of the supporting housing.

[0009] Furthermore, the support housing is provided with a plurality of evenly distributed pressure valves, which are configured to open when the oil pressure is too high; An outer support frame is nested inside the support shell, and an outer filter cylinder is sleeved between the support shell and the outer support frame.

[0010] Furthermore, the pressure valve includes a cross-shaped groove and a movable flap. The side wall of the support housing is provided with a plurality of evenly distributed cross-shaped grooves, which divide the side wall of the support housing into a plurality of elastically deformable movable flaps. The movable valve is configured to be deformed by hydraulic pressure within the centrifugal channel.

[0011] Furthermore, at least one annular sealing ring is provided between the bottom end of the support housing and the oil drain channel inlet extending to the center of the base.

[0012] Furthermore, the inner filter element includes an inner filter cylinder and an inner support frame disposed inside the inner filter cylinder.

[0013] Furthermore, the inner filter cartridge has a pleated filter media structure, which is used to increase the filtration area and flow rate within the same installation space.

[0014] Furthermore, the outlet of the oil inlet channel is located at the top edge of the base, corresponding to the lower inlet of the annular gap.

[0015] Furthermore, the inlet of the oil drain channel is located at the center of the base, and the bottom center of the support housing is aligned with the oil drain channel.

[0016] Beneficial effects: 1. By setting a guide spiral inside the sealed shell and forming a spiral upward centrifugal channel, a filter groove is opened on the inner wall of the sealed shell. Under the guidance of the guide spiral, the oil flows spirally upward along the centrifugal channel. The high-speed rotation generates centrifugal force, and large particles of impurities in the oil are thrown towards the inner wall of the sealed shell and fall into the filter groove opened on the inner wall of the sealed shell to be intercepted, completing the centrifugal separation and no longer entering the subsequent filter element.

[0017] 2. By setting an external filter cartridge inside the support housing and setting multiple cross-shaped grooves on the side wall of the support housing, a pressure valve structure is formed. When the oil pressure in the centrifugal channel is blocked by impurities or the flow rate suddenly exceeds the set threshold, the high-pressure oil pushes the movable valve to open elastically. The hydraulic oil can enter the support housing through the pressure valve and be filtered by the external filter cartridge. At this time, both the external and internal filter cartridges can filter hydraulic oil, increasing the filtration flow rate and realizing high-pressure, high-flow filtration to prevent the system from being damaged due to excessive pressure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a wind power hydraulic oil pressure-resistant filter according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the guide spiral structure in a wind power hydraulic oil pressure-resistant filter according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a wind power hydraulic oil pressure-resistant filter proposed in an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram showing the disassembled support housing, inner filter element, and outer support frame in a wind power hydraulic oil pressure-resistant filter according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the structure of the inner filter element in a wind power hydraulic oil pressure-resistant filter according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the base structure in a wind power hydraulic oil pressure-resistant filter according to an embodiment of the present invention; Figure 8 for Figure 5 Enlarged diagram of point B in the middle.

[0019] Among them, 1. Base; 101. Oil inlet channel; 102. Oil outlet channel; 2. Support shell; 201. Cross groove; 202. Movable flap; 21. Outer filter cartridge; 22. Outer support frame; 3. Inner filter element; 31. Inner filter cartridge; 32. Inner support frame; 4. Sealing shell; 401. Filter chamber; 402. Filter groove; 5. Guide spiral; 501. Centrifugal channel.

[0020] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0022] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0023] Combination Figure 1 As shown, an embodiment of the present invention provides a wind power hydraulic oil pressure-resistant filter, including a base 1, a supporting shell 2, an inner filter element 3, a sealing shell 4, and a guide spiral 5.

[0024] Combination Figure 3 and Figure 7 As shown, the base 1 is provided with an oil inlet channel 101 and an oil outlet channel 102. The two channels are independent of each other and are not connected. The outlet of the oil inlet channel 101 is located at the top edge of the base 1, and the inlet of the oil outlet channel 102 is located at the center of the base 1.

[0025] The lower end of the sealing shell 4 is sealed and fixedly connected to the base 1, forming a closed filter chamber 401 inside. The supporting shell 2 is coaxially arranged inside the sealing shell 4, and a uniform annular gap is formed between the outer wall and the inner wall of the sealing shell 4. The inner filter element 3 is coaxially fitted inside the supporting shell 2. The top of the inner filter element 3 is provided with an opening. The oil rises through the annular gap, enters the inner filter element 3 through the top opening of the inner filter element 3, and enters the supporting shell 2 after being filtered by the inner filter element 3.

[0026] Combination Figure 2 , Figure 3 and Figure 4 As shown, the guide spiral 5 is fixedly installed in the annular gap and connected to the inner wall of the sealing shell 4 or the outer wall of the support shell 2, dividing the annular gap into a continuously spiraling centrifugal channel 501. The inner side wall of the sealing shell 4 has a filter groove 402 opened along the axial direction. The filter groove 402 is directly connected to the centrifugal channel 501 and is used to capture large particulate impurities separated by centrifugation.

[0027] The inlet of the oil drain channel 102 is located in the central area of ​​the upper surface of the base 1, and the outlet is connected to the system return oil or main oil supply pipeline. The bottom center of the support housing 2 is connected to the inlet of the oil drain channel 102. All the filtered clean oil flows into the oil drain channel 102 for discharge. The inlet of the oil inlet channel 101 is used to connect to the high-pressure oil supply pipeline of the wind power hydraulic system. The outlet of the oil inlet channel 101 is located in the edge area of ​​the upper surface of the base 1, directly opposite the lower inlet of the annular gap between the sealing shell 4 and the support housing 2, so that the input oil can enter the centrifugal channel 501 to avoid eddies and impacts.

[0028] In a specific embodiment, at least one annular sealing ring is provided between the bottom end of the support housing 2 and the mating surface of the base 1. The sealing ring is made of oil-resistant rubber and is embedded in the sealing groove of the base 1 to prevent unfiltered oil from directly entering the oil drain channel 102 from the mating gap.

[0029] The annular seal is made of fluororubber or nitrile rubber and is suitable for use with mineral oil and synthetic hydraulic oil in wind power hydraulic systems. The size of the sealing groove is precisely matched with the diameter of the sealing ring, which can achieve reliable sealing under high pressure and prevent unfiltered oil from short-circuiting.

[0030] Specifically, the support shell 2 is a cylindrical support frame made of high-strength metal or engineering plastic. The preferred metal material is stainless steel or aluminum alloy to ensure that no plastic deformation occurs under high pressure.

[0031] In an optional embodiment, the filter tank 402 is a strip-shaped groove extending axially along the sealing shell 4, and multiple grooves can be evenly arranged circumferentially; the cross-sectional shape is V-shaped, trapezoidal or rectangular, the opening faces the outer wall of the supporting shell 2, and the opening width is greater than the diameter of large particle impurities, so as to facilitate the entry and storage of impurities, while preventing impurities from flowing back to the centrifugal channel 501 when the oil flows.

[0032] In this way, the oil to be filtered is fed into the filter chamber 401 inside the sealing shell 4 through the oil inlet channel 101. Under the guidance of the guide spiral 5, the oil flows spirally upward along the centrifugal channel 501 and generates centrifugal force through high-speed rotation. Large particles of impurities move towards the inner wall of the sealing shell 4 under centrifugal action and are collected and stored in the filter tank 402. They no longer enter the subsequent filter element, so there is no need to set up two separate filter elements, saving costs.

[0033] During the spiral ascent of the oil, the oil continues to rotate, and the centrifugal force acts stably on the impurity particles, achieving continuous and efficient pre-separation and reducing the impurity load on the inner filter element 3 from the source.

[0034] Without increasing the number of filter elements or significantly increasing flow resistance, centrifugal pre-separation of large particulate impurities is achieved, forming a multi-stage filtration effect of centrifugal pre-separation plus precision filtration.

[0035] Combination Figure 6 As shown, the inner filter element 3 includes an inner filter cartridge 31 and an inner support frame 32. The inner support frame 32 is a porous cylindrical structure with high strength and a large flow area. It is used to provide radial and axial support for the inner filter cartridge 31 and prevent the inner filter cartridge 31 from shrinking, deforming or breaking under high pressure differential.

[0036] Specifically, the surface of the inner support frame 32 is evenly distributed with circular or waist-shaped through holes, with an opening rate of not less than 60%, to ensure smooth oil flow.

[0037] In an optional embodiment, the inner filter cartridge 31 adopts a pleated filter media structure, and the filter media is glass fiber, polyester fiber or metal mesh. The pleated structure significantly increases the effective filtration area within the same installation space, reduces filtration resistance, and increases flow rate to meet the high pressure and high flow rate requirements of wind power hydraulic systems.

[0038] It should be noted that the filtration accuracy of the inner filter cartridge 31 is set according to system requirements and is used to remove small particulate impurities remaining after centrifugal pre-separation.

[0039] Furthermore, the top of the inner filter element 3 is an open opening, allowing the spiraling, pre-separated oil to smoothly enter the interior of the inner filter element 3 from top to bottom. The oil passes through the inner filter cylinder 31, impurities are trapped on the outer surface of the inner filter cylinder 31, and clean oil enters the interior of the support housing 2.

[0040] Thus, the oil to be filtered is fed into the filter chamber 401 inside the sealing shell 4 through the oil inlet channel 101. Under the guidance of the guide spiral 5, the oil flows spirally upward along the centrifugal channel 501, generating centrifugal force through high-speed rotation. Large particles of impurities move towards the inner wall of the sealing shell 4 under centrifugal action and are collected and stored in the filter tank 402, no longer entering the subsequent filter element. After the oil rises to the top of the sealing shell 4, it enters the inner filter element 3 through the top opening of the inner filter cylinder 31. The oil passes through the inner filter cylinder 31, and the impurities are trapped on the outer surface of the inner filter cylinder 31. The clean oil enters the interior of the support shell 2 and finally flows into the oil outlet channel 102 for discharge.

[0041] Combination Figure 2 , Figure 5 and Figure 8 As shown, the side wall of the support housing 2 has multiple cross-shaped grooves 201, which divide the side wall of the support housing 2 into multiple elastically deformable movable petals 202 to form a pressure valve structure. The pressure valve is configured to open when the oil pressure is too high. An outer support frame 22 is nested inside the support housing 2, and an outer filter cartridge 21 is sleeved between the support housing 2 and the outer support frame 22.

[0042] In a specific embodiment, the outer support frame 22 is a porous or mesh structure that provides radial support and prevents the outer filter cartridge 21 from collapsing under high pressure.

[0043] Thus, when the oil pressure in the centrifugal channel 501 exceeds the set threshold due to impurities or sudden changes in flow, the high-pressure oil pushes the movable valve 202 to open elastically, allowing hydraulic oil to enter the support housing 2 through the pressure valve and be filtered by the outer filter cartridge 21. At this time, both the outer filter cartridge 21 and the inner filter cartridge 31 can filter hydraulic oil, increasing the filtration flow rate and achieving high-pressure, high-flow filtration. After the pressure returns to normal, the movable valve 202 automatically resets under its own elasticity, maintaining the flow channel seal. This structure requires no additional springs, valve cores, or other components, resulting in a simple structure, high reliability, and rapid response.

[0044] The working principle of this invention is as follows: The hydraulic oil to be filtered enters from the oil inlet channel 101 of the base 1 under the action of external pump pressure, flows into the filter chamber 401 of the sealing shell 4 through the outlet, and is transported to the bottom of the annular gap between the sealing shell 4 and the support shell 2. Under the guidance of the guide spiral 5, the oil flows spirally upward along the centrifugal channel 501, and the high-speed rotation generates centrifugal force. Large particles of impurities in the oil are subject to greater centrifugal force due to their larger mass. They are thrown towards the inner wall of the sealing shell 4 and fall into the filter groove 402 opened on the inner wall of the sealing shell 4, where they are intercepted and contained, completing the centrifugal separation. They no longer enter the subsequent filter element, eliminating the need for two separate filter elements and saving costs.

[0045] The oil, now free of large particulate impurities, continues to flow upwards along the centrifugal channel 501 until it reaches the top opening of the inner filter element 3. The oil enters the interior of the inner filter element 3 through the top opening and then passes through the filter wall of the inner filter cylinder 31 from the inside out. During this process, any remaining small particulate impurities in the oil are trapped by the high-precision filter media of the inner filter cylinder 31, completing the second stage of precision filtration.

[0046] The clean oil, filtered by the inner filter cartridge 31, enters the internal space of the support housing 2, and finally flows downwards, exiting through the oil discharge channel 102 in the center of the base 1 and returning to the hydraulic system.

[0047] Under normal operating conditions, the pressure valve (movable flap 202) on the support housing 2 remains closed. When the oil pressure in the centrifugal channel 501 exceeds the set threshold due to impurities or sudden changes in flow, the high-pressure oil pushes the movable flap 202 to open elastically, allowing hydraulic oil to enter the support housing 2 through the pressure valve and be filtered by the outer filter cartridge 21. At this time, both the outer filter cartridge 21 and the inner filter cartridge 31 can filter the hydraulic oil, increasing the filtration flow rate and achieving high-pressure, high-flow filtration. After the pressure returns to normal, the movable flap 202 automatically resets under its own elasticity, maintaining the flow channel seal. This structure requires no additional springs, valve cores, or other components, resulting in a simple structure, high reliability, and rapid response.

[0048] In summary, by setting a guide spiral 5 inside the sealing shell 4 and forming a spiral upward centrifugal channel 501, and correspondingly, a filter groove 402 is opened on the inner wall of the sealing shell 4, the oil flows spirally upward along the centrifugal channel 501 under the guidance of the guide spiral 5. The high-speed rotation generates centrifugal force. Large particles of impurities in the oil are subject to greater centrifugal force due to their larger mass. They are thrown towards the inner wall of the sealing shell 4 and fall into the filter groove 402 opened on the inner wall of the sealing shell 4, where they are intercepted and contained, completing the centrifugal separation. They no longer enter the subsequent filter element, eliminating the need for a separate two-stage filter element and saving costs.

[0049] Without increasing the number of filter elements or significantly increasing flow resistance, centrifugal pre-separation of large particulate impurities is achieved, forming a multi-stage filtration effect of centrifugal pre-separation plus precision filtration.

[0050] By setting an outer filter cartridge 21 inside the support housing 2 and setting multiple cross-shaped grooves 201 on the side wall of the support housing 2, the cross-shaped grooves 201 divide the side wall of the support housing 2 into multiple elastically deformable movable flaps 202, forming a pressure valve structure. When the oil pressure in the centrifugal channel 501 exceeds the set threshold due to impurities or sudden changes in flow, the high-pressure oil pushes the movable flaps 202 to open elastically, and the hydraulic oil can enter the support housing 2 through the pressure valve and be filtered by the outer filter cartridge 21. At this time, both the outer filter cartridge 21 and the inner filter cartridge 31 can filter hydraulic oil, increasing the filtration flow rate and achieving high-pressure, high-flow filtration, preventing the system from being damaged due to excessive pressure.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A pressure-resistant filter for wind power hydraulic oil, characterized in that, include: The base (1) has an oil inlet channel (101) and an oil outlet channel (102) inside. A sealing shell (4) is installed on the base (1) and a filter chamber (401) is formed inside it. A support housing (2) is disposed inside the sealing housing (4) and forms an annular gap with the sealing housing (4). The oil inlet channel (101) communicates with the annular gap, and the oil outlet channel (102) communicates with the internal space of the support housing (2). An inner filter element (3) is coaxially disposed inside the support housing (2), and the inner filter element (3) has a top opening; A guide spiral (5) is provided in the annular gap and forms a centrifugal channel (501) in the annular gap, which is used to guide the oil entering from the oil inlet channel (101) to flow upward along the spiral path and generate rotational centrifugal force. The inner wall of the sealing shell (4) is provided with a filter groove (402) for accommodating large particulate impurities that move outward due to centrifugal force.

2. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: The filter groove (402) is a strip-shaped groove extending axially along the sealing shell (4).

3. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: The cross-sectional shape of the filter tank (402) is V-shaped, trapezoidal or rectangular, and the opening of the filter tank (402) faces the outer wall of the support housing (2).

4. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: The support housing (2) is provided with a plurality of evenly distributed pressure valves, which are configured to open when the oil pressure is too high; The support shell (2) is nested inside an outer support frame (22), and an outer filter cylinder (21) is sleeved between the support shell (2) and the outer support frame (22).

5. The wind power hydraulic oil pressure-resistant filter according to claim 4, characterized in that: The pressure valve includes a cross-shaped groove (201) and a movable flap (202). The side wall of the support housing (2) is provided with a plurality of evenly distributed cross-shaped grooves (201). The cross-shaped grooves (201) divide the side wall of the support housing (2) into a plurality of elastically deformable movable flaps (202). The movable valve (202) is configured to be deformed by hydraulic pressure within the centrifugal channel (501).

6. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: At least one annular sealing ring is provided between the bottom end of the support housing (2) and the inlet of the oil drain channel (102) extending to the center of the base (1).

7. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: The inner filter element (3) includes an inner filter cylinder (31) and an inner support frame (32) disposed inside the inner filter cylinder (31).

8. The wind power hydraulic oil pressure-resistant filter according to claim 7, characterized in that: The inner filter cartridge (31) has a pleated filter media structure, which is used to increase the filtration area and flow rate within the same installation space.

9. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: The outlet of the oil inlet channel (101) is located at the top edge of the base (1), corresponding to the lower inlet of the annular gap.

10. The wind power hydraulic oil pressure-resistant filter according to claim 1, characterized in that: The inlet of the drain channel (102) is located at the center of the base (1), and the bottom center of the support housing (2) is aligned with the drain channel (102).

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