Hydraulic pipeline filter
By designing a hydraulic pipeline filter and utilizing a bypass valve that automatically opens when the filter element is clogged, the problems of filter element flow mismatch and system pressure caused by clogging are solved, achieving full flow passage and stable operation of the hydraulic system.
Patent Information
- Application Number
- CN202520384616.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-06
AI Technical Summary
The selection of filter elements in existing engineering machinery filters leads to flow mismatch, the assembly process is cumbersome, and filter element clogging can easily cause excessive system pressure or damage.
Design a hydraulic pipeline filter, comprising a filter head, a cylinder, and a filter element. A bypass valve automatically opens when the filter element is clogged, allowing the oil to flow directly back to the hydraulic system around the filter element, ensuring full flow.
This effectively avoids excessive system pressure or damage caused by filter clogging, ensures unobstructed oil circuits, and guarantees the continuous and stable operation of the hydraulic system.
Smart Images
Figure CN223923485U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic system technology, and in particular to a hydraulic pipeline filter. Background Technology
[0002] Currently, in order to ensure the service life of the filter element, the filters selected for construction machinery are generally filters with a flow rate greater than the actual flow rate of the equipment. This results in a mismatch between the inlet and outlet flow rates of the filter and the actual flow rate. During assembly, an intermediate flange needs to be added for conversion, making the assembly process cumbersome. Utility Model Content
[0003] The purpose of this invention is to provide a hydraulic pipeline filter to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively ensures the full flow of the filter.
[0004] To achieve the above objectives, this utility model provides the following solution:
[0005] This utility model provides a hydraulic pipeline filter, comprising: a filter head, a cylinder, and a filter element. The filter head includes an oil inlet pipeline, an oil outlet pipeline, a bypass pipeline, a bypass valve, a filter element installation position, and a cylinder installation position. The cylinder is tightly connected to the cylinder installation position and forms a first inner cavity within the cylinder. The filter element is tightly connected to the filter element installation position and is disposed within the first inner cavity. The filter element has a second inner cavity inside, and the filter element is capable of filtering impurities in the oil that passes through the second inner cavity and enters the first inner cavity.
[0006] The oil inlet pipe has one end connected to the input pipe of the hydraulic system to allow oil from the hydraulic system to enter the oil inlet pipe, and the other end connected to the first inner cavity. The oil outlet pipe has one end connected to the second inner cavity, and the other end connected to the output pipe of the hydraulic system to deliver the filtered oil back to the hydraulic system. The bypass pipe has one end connected to the first inner cavity through the bypass valve, and the other end connected to the output pipe of the hydraulic system. When the pressure in the first inner cavity exceeds a preset pressure, the bypass valve can connect the first inner cavity to the output pipe of the hydraulic system.
[0007] Preferably, the bypass valve includes a valve body, a valve core, a valve seat, and a spring. The valve body has a first opening on its side wall, a second opening at its bottom, and a blind mounting hole at its top. The first opening communicates with the bypass pipe, and the second opening communicates with the first inner cavity. The top of the valve core is slidably connected to the blind mounting hole. The valve seat is sealed to the inner side wall of the second opening. The valve seat has a third opening in its middle. The spring is sleeved on the outside of the valve core. One end of the spring is fixedly connected to the blind mounting hole, and the other end is fixedly connected to the bottom end of the valve core. The spring pushes the valve core against the valve seat to close the third opening. When the pressure in the first inner cavity is greater than the preset pressure of the spring, the spring can be compressed to move the valve core away from the valve seat, thereby opening the third opening to connect the first and second openings.
[0008] Preferably, the contact surface between the valve core and the valve seat is a conical surface.
[0009] Preferably, the bypass valve further includes an annular baffle and a first sealing ring. The inner sidewall of the first opening is provided with a first mounting ring groove and a second mounting ring groove. The outer edge of the annular baffle is installed in the first mounting ring groove. The top surface of the annular baffle is used to fix it to the valve seat. The first sealing ring is installed in the second mounting ring groove, and the inner edge of the first sealing ring protrudes from the second mounting ring groove and seals against the outer sidewall of the valve seat.
[0010] Preferably, it also includes a second sealing ring. The top of the cylinder is provided with an external thread, and the cylinder mounting position is provided with an internal thread and a third mounting ring groove. The external thread at the top of the cylinder is used to connect with the internal thread of the cylinder mounting position. The second sealing ring is used to be installed in the third mounting ring groove, and the inner edge of the second sealing ring protrudes from the third mounting ring groove and seals and presses against the outer wall of the cylinder.
[0011] Preferably, the device further includes a screw plug and a washer. The bottom end of the cylinder is a tapered end, and a discharge screw hole is provided at the bottom of the tapered end. The screw plug is used to be threaded into the discharge screw hole, and the washer is used to be sleeved on the outside of the screw of the screw plug and located between the screw cap of the screw plug and the bottom end of the cylinder.
[0012] Preferably, the filter head further includes a first pressure testing connector with vent and a second pressure testing connector with vent. The first pressure testing connector with vent is detachably connected to the top of the oil inlet pipe and communicates with the oil inlet pipe to measure the pressure of the oil inlet pipe. The second pressure testing connector with vent is detachably connected to the top of the oil outlet pipe and communicates with the oil outlet pipe to measure the pressure of the oil outlet pipe.
[0013] Preferably, the filter head further includes a transmitter, which is signal-connected to the first and second exhaust pressure test connectors and can issue an alarm signal when the pressure difference measured by the first and second exhaust pressure test connectors reaches a preset value.
[0014] Preferably, the filter element includes an upper cover, a lower cover, and a cylindrical filter material. The upper cover has a fourth opening in the middle, and the fourth opening is sealed and installed at the filter element installation position. The lower cover is arranged parallel to the upper cover. The top and bottom ends of the cylindrical filter material are respectively bonded and fixed to the upper cover and the lower cover to form the second inner cavity on the inner side of the cylindrical filter material.
[0015] Preferably, the filter element further includes a cylindrical frame and a third sealing ring. The upper cover has a downward-facing first protrusion in the middle, and the lower cover has a upward-facing second protrusion in the middle. The cylindrical fixing bracket is tightly disposed on the inner side of the cylindrical filter material, and the top end of the cylindrical frame is sleeved on the outer side of the first protrusion and bonded to the upper cover. The bottom end of the cylindrical frame is sleeved on the outer side of the second protrusion and bonded to the lower cover. The top of the upper cover has a fourth mounting ring groove, and the third sealing ring is installed in the fourth mounting ring groove, with the inner edge of the third sealing ring protruding from the fourth mounting ring groove and sealing and pressing against the filter element installation position.
[0016] The present invention achieves the following technical advantages over the prior art:
[0017] This invention provides a hydraulic pipeline filter that rationally plans the flow path of the oil within the filter. Under normal circumstances, the oil is filtered through the filter element, ensuring oil cleanliness. When the pressure in the first inner chamber exceeds a preset value (usually indicating abnormalities such as filter element blockage), the bypass valve opens, allowing the oil to bypass the blocked filter element and flow directly back into the hydraulic system, effectively ensuring full flow through the filter. This avoids excessive system pressure or filter element damage due to blockage, ensuring unobstructed oil passages and the continuous and stable operation of the hydraulic system. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A structural cross-sectional view of the hydraulic pipeline filter provided by this utility model;
[0020] Figure 2 A structural cross-sectional view of the hydraulic pipeline filter provided by this utility model;
[0021] Figure 3 Another structural cross-sectional view of the hydraulic pipeline filter provided by this utility model;
[0022] In the diagram: 1. Filter head; 11. Inlet oil line; 12. Outlet oil line; 13. Bypass line; 14. Bypass valve; 141. Valve body; 142. Valve core; 143. Valve seat; 144. Spring; 145. Mounting blind hole; 146. Conical surface; 147. Annular baffle; 148. First sealing ring; 15. First pressure test connector with exhaust; 16. Second pressure test connector with exhaust; 17. Indicator; 2. Cylinder; 21. Second sealing ring; 22. Plug; 23. Washer; 3. Filter element; 31. Top cover; 32. Bottom cover; 33. Cylindrical filter media; 34. Cylindrical frame; 35. Third sealing ring; 36. First protrusion; 37. Second protrusion; 38. First ring plate; 39. Second ring plate. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] The purpose of this invention is to provide a hydraulic pipeline filter to solve the problems existing in the prior art. It has a simple structure, is easy to use, and effectively ensures the full flow of the filter.
[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] This utility model provides a hydraulic pipeline filter, such as Figures 1-3 As shown, it includes: a filter head 1, a cylinder 2, and a filter element 3. The filter head 1 includes an oil inlet pipe 11, an oil outlet pipe 12, a bypass pipe 13, a bypass valve 14, a filter element installation station, and a cylinder installation station. The cylinder 2 is tightly connected to the cylinder installation station and forms a first inner cavity within the cylinder 2. The filter element 3 is tightly connected to the filter element installation station and is disposed within the first inner cavity. The filter element 3 has a second inner cavity inside it, and the filter element 3 can filter impurities in the oil that passes through the second inner cavity and enters the first inner cavity.
[0027] The oil inlet pipe 11 is connected to the input pipe of the hydraulic system at one end to allow oil from the hydraulic system to enter the oil inlet pipe 11, and the other end is connected to the first inner cavity. The oil outlet pipe 12 is connected to the second inner cavity at one end, and the other end is connected to the output pipe of the hydraulic system to transport the filtered oil back to the hydraulic system. The bypass pipe 13 is connected to the first inner cavity at one end through the bypass valve 14, and the other end is connected to the output pipe of the hydraulic system. When the pressure in the first inner cavity exceeds the preset pressure, the bypass valve 14 can connect the first inner cavity to the output pipe of the hydraulic system. This oil circuit layout design rationally plans the flow path of the oil in the filter. Under normal circumstances, the oil is filtered through the filter element 3 to ensure the cleanliness of the oil. When the pressure in the first inner cavity exceeds the preset value (usually indicating abnormal conditions such as filter element 3 blockage), the bypass valve 14 opens to allow the oil to bypass the blocked filter element 3 and flow directly back to the hydraulic system, avoiding excessive system pressure or damage to the filter element 3 due to blockage, ensuring the smooth flow of the oil circuit and the continuous and stable operation of the hydraulic system.
[0028] In a preferred embodiment, the bypass valve 14 includes a valve housing 141, a valve core 142, a valve seat 143, and a spring 144. The valve housing 141 has a first opening on its side wall, a second opening at its bottom, and a blind mounting hole 145 at its top. The first opening communicates with a bypass pipe, and the second opening communicates with a first inner cavity. The top of the valve core 142 is slidably connected to the blind mounting hole 145. The valve seat 143 is sealed to the inner side wall of the second opening, and a third opening is provided in the middle of the valve seat 143. The spring 144 is sleeved on the outside of the valve core 142. One end of the spring 144 is fixedly connected to the blind mounting hole 145, and the other end is fixedly connected to the bottom end of the valve core 142. The spring 144 is used for… The valve core 142 is pushed against the valve seat 143 to close the third opening. When the pressure in the first inner cavity is greater than the preset pressure of the spring 144, the spring 144 is compressed to move the valve core 142 away from the valve seat 143, thereby opening the third opening to connect the first and second openings. When the system pressure is normal, the spring 144 pushes the valve core 142 to tightly press against the valve seat 143, closing the third opening and ensuring normal filtration. When the system pressure rises abnormally to exceed the preset pressure of the spring 144, the valve core 142 overcomes the force of the spring 144 and leaves the valve seat 143, realizing the bypass function. This ensures that the oil can flow smoothly in abnormal situations such as filter element 3 blockage, preventing the system from being damaged due to excessive pressure and improving the safety and reliability of the system.
[0029] In a preferred embodiment, the contact surface between the valve core 142 and the valve seat 143 is a conical surface 146. The design of the contact surface between the valve core 142 and the valve seat 143 as a conical surface 146 can provide better sealing performance when the valve core 142 and the valve seat 143 are in contact, reducing the possibility of oil leakage. On the other hand, during the opening and closing process of the valve core 142, the design of the conical surface 146 helps the valve core 142 to move smoothly and to better fit and separate from the valve seat 143, improving the stability and reliability of the bypass valve 14 during operation, and making the pressure control and oil flow control of the entire hydraulic system more precise and effective.
[0030] In a preferred embodiment, the bypass valve 14 further includes an annular baffle 147 and a first sealing ring 148. The inner wall of the first opening is provided with a first mounting ring groove and a second mounting ring groove. The outer edge of the annular baffle 147 is installed in the first mounting ring groove, and the top surface of the annular baffle 147 is used for fixed connection with the valve seat 143. The first sealing ring 148 is installed in the second mounting ring groove, and the inner edge of the first sealing ring 148 protrudes from the second mounting ring groove and seals against the outer wall of the valve seat 143. The annular baffle 147 and the first sealing ring 148 further enhance the sealing performance of the bypass valve 14. The annular baffle 147 can position and fix the valve seat 143, ensuring the stability of the valve seat 143's position. The first sealing ring 148 can effectively prevent oil leakage from the gap between the first opening and the valve seat 143, improving the sealing performance of the bypass valve 14 in the closed state, avoiding accidental opening of the bypass valve 14 or bypass leakage of oil, and improving the stability and reliability of the hydraulic system.
[0031] In a preferred embodiment, the hydraulic pipeline filter further includes a second sealing ring 21. The top of the cylinder 2 is provided with an external thread, and the cylinder mounting position is provided with an internal thread and a third mounting ring groove. The external thread on the top of the cylinder 2 is used for threaded connection with the internal thread of the cylinder mounting position. The second sealing ring 21 is used for installation in the third mounting ring groove, and the inner edge of the second sealing ring 21 protrudes from the third mounting ring groove and seals and presses against the outer side wall of the cylinder 2. The second sealing ring 21 and the threaded connection ensure good sealing between the cylinder 2 and the cylinder mounting position, prevent oil leakage from the connection, and provide effective protection for the sealing of the entire filter. This ensures that the internal oil maintains normal pressure and flow state when the filter is working, and avoids affecting the filtration effect and the operation of the entire hydraulic system due to leakage at the connection.
[0032] In a preferred embodiment, the hydraulic pipeline filter further includes a plug 22 and a washer 23. The bottom end of the cylinder 2 is tapered, and a discharge screw hole is provided at the bottom of the tapered end. The plug 22 is threaded into the discharge screw hole, and the washer 23 is fitted onto the outside of the screw of the plug 22 and located between the nut of the plug 22 and the bottom end of the cylinder 2. The design of the plug 22 and the washer 23 facilitates cleaning and maintenance. When it is necessary to clean the inner wall of the cylinder 2 or the inside of the filter, the plug 22 can be unscrewed to facilitate the discharge of impurities, accumulated water, etc. The washer 23 ensures good sealing after the plug 22 is tightened, preventing oil leakage from the connection of the plug 22 and ensuring the sealing and stability of liquid flow during normal operation of the filter.
[0033] In a preferred embodiment, the filter element 3 includes an upper cover 31, a lower cover 32, and a cylindrical filter media 33. The upper cover 31 has a fourth opening in the middle, which is sealed and installed at the filter element installation position. The lower cover 32 is arranged parallel to the upper cover 31. The top and bottom ends of the cylindrical filter media 33 are respectively bonded and fixed to the upper cover 31 and the lower cover 32 to form a second inner cavity on the inner side of the cylindrical filter media 33. This simple and effective configuration constitutes the basic shape of the filter element 3, defining the second inner cavity for oil input. This allows the filter element 3 to effectively intercept and filter impurities in the oil that pass through the filter media from the second inner cavity into the first inner cavity. This provides a specific structural basis for the filter to achieve its basic filtration function and ensures effective blocking of impurities in the oil.
[0034] In a preferred embodiment, the filter element 3 further includes a cylindrical frame 34 and a third sealing ring 35. A first protrusion 36 is downwardly positioned at the center of the upper cover 31, and a second protrusion 37 is upwardly positioned at the center of the lower cover 32. A cylindrical fixing bracket is tightly fitted to the inner side of the cylindrical filter material 33. The top end of the cylindrical frame 34 is fitted over the outer side of the first protrusion 36 and bonded to the upper cover 31. The bottom end of the cylindrical frame 34 is fitted over the outer side of the second protrusion 37 and bonded to the lower cover 32. A fourth mounting ring groove is provided at the top of the upper cover 31. The third sealing ring 35... 5. The filter element 3 is installed in the fourth mounting ring groove, and the inner edge of the third sealing ring 35 protrudes from the fourth mounting ring groove and seals and tightens against the filter element installation position. The cylindrical frame 34 enhances the structural strength of the filter element 3, making it less prone to deformation and damage during the process of bearing oil pressure and impurity adsorption, thus ensuring the stability and reliability of the filter element 3. The third sealing ring 35 strengthens the sealing between the filter element 3 and the filter element installation position, preventing oil from bypassing the gap between the filter element 3 and the filter element installation position without effective filtration by the filter element 3, thereby improving filtration efficiency and quality.
[0035] In a preferred embodiment, a first ring plate 38 is disposed downward on the outer edge of the upper cover 31, and a second ring plate 39 is disposed upward on the outer edge of the lower cover 32. The top ends of the cylindrical filter material 33 and the cylindrical frame 34 are disposed in the groove formed between the first ring plate 38 and the first protrusion 36, and the bottom ends of the cylindrical filter material 33 and the cylindrical frame 34 are disposed in the groove formed between the second ring plate 39 and the second protrusion 37.
[0036] In a preferred embodiment, the filter head 1 further includes a first pressure testing connector 15 with venting and a second pressure testing connector 16 with venting. The first pressure testing connector 15 is detachably connected to the top of the oil inlet pipe 11 and communicates with the oil inlet pipe 11 to measure the pressure of the oil inlet pipe 11. The second pressure testing connector 16 is detachably connected to the top of the oil outlet pipe 12 and communicates with the oil outlet pipe 12 to measure the pressure of the oil outlet pipe 12. By setting the first pressure testing connector 15 and the second pressure testing connector 16 with venting, real-time measurement of the pressure of the oil inlet pipe 11 and the oil outlet pipe 12 is achieved. Operators can intuitively understand the pressure conditions at the filter inlet and outlet, providing accurate data for judging the working status of the filter element 3, the working stability of the entire hydraulic system, and whether there are blockages or other problems. This helps to detect potential faults in advance and ensure the normal operation of the hydraulic system. In addition, the first pressure testing connector 15 and the second pressure testing connector 16 with venting can be used for venting operations. This is necessary when the hydraulic system needs to be started or is under maintenance or repair. The usual process might involve first turning on the system to allow the oil to flow slowly, and the air present in the filter and pipeline will gradually accumulate near the exhaust pressure test joint as the oil flows.
[0037] Loosen the dedicated venting mechanism on the vent test connector (this could be a knob, valve, etc.). The air accumulated here will be forced out of the filter (to the outside of the tank, such as the atmosphere) by the system pressure and fluid flow. During the venting process, you may observe air bubbles exiting the vent. Continue until the bubbles completely disappear, indicating that the air has been largely removed. Then close the venting mechanism to complete the venting process. Since the vent test connector has a pressure measuring function, if it contains air, the compressibility of air differs from that of fluid, leading to inaccurate pressure readings. Removing the air ensures more accurate pressure measurements, allowing operators to use precise pressure data to assess the operating status of the filter and hydraulic system, making appropriate maintenance and control decisions to ensure stable system operation.
[0038] In a preferred embodiment, the filter head 1 further includes a transmitter 17, which is signal-connected to the first pressure testing connector 15 with exhaust and the second pressure testing connector 16 with exhaust. The transmitter 17 can issue an alarm signal when the pressure difference measured by the first pressure testing connector 15 and the second pressure testing connector 16 reaches a preset value. The transmitter 17, signal-connected to both pressure testing connectors, issues an alarm signal when the pressure difference reaches the preset value, allowing operators to promptly detect abnormalities such as the degree of blockage in the filter element 3. This enables timely detection and intervention in the early stages of hydraulic system problems, preventing hydraulic system malfunctions or even damage due to excessive blockage of the filter element 3, further improving the safety and reliability of the entire hydraulic system.
[0039] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A hydraulic line filter characterized by: The application relates to a filter head (1) comprising an oil inlet pipeline (11), an oil outlet pipeline (12), a bypass pipeline (13), a bypass valve (14), a filter element mounting station and a cylinder mounting station. The cylinder (2) is tightly connected to the cylinder mounting station and forms a first inner cavity in the cylinder (2). The filter element (3) is tightly connected to the filter element mounting station, is arranged in the first inner cavity, and has a second inner cavity in the inside of the filter element (3). The filter element (3) can filter impurities in oil liquid which passes through the filter element (3) from the second inner cavity into the first inner cavity. One end of the oil inlet pipeline (11) is used for being connected and communicated with an input pipeline of a hydraulic system so that oil liquid in the hydraulic system enters the oil inlet pipeline (11), and the other end is communicated with the first inner cavity. One end of the oil outlet pipeline (12) is communicated with the second inner cavity, and the other end is used for being communicated with an output pipeline of the hydraulic system so as to deliver filtered oil liquid back to the hydraulic system. One end of the bypass pipeline (13) is communicated with the first inner cavity through the bypass valve (14), and the other end is used for being communicated with the output pipeline of the hydraulic system. When the pressure in the first inner cavity exceeds a preset pressure, the bypass valve (14) can communicate the first inner cavity with the output pipeline of the hydraulic system. The bypass valve (14) comprises a valve shell (141), a valve core (142), a valve seat (143) and a spring (144). A side wall of the valve shell (141) is provided with a first opening, a bottom of the valve shell (141) is provided with a second opening, and a top of the valve shell (141) is provided with a mounting blind hole (145). The first opening is used for being communicated with the bypass pipeline, and the second opening is used for being communicated with the first inner cavity. The top of the valve core (142) is used for being slidingly connected to the mounting blind hole (145). The valve seat (143) is sealingly connected to an inner side wall of the second opening. A middle part of the valve seat (143) is provided with a third opening. The spring (144) is sleeved on the outer side of the valve core (142). One end of the spring (144) is fixedly connected to the mounting blind hole (145), and the other end is fixedly connected to the bottom end of the valve core (142). The spring (144) is used for pushing the valve core (142) to tightly press the valve seat (143) to close the third opening. When the pressure in the first inner cavity is greater than a preset pressure of the spring (144), the spring (144) can be compressed to make the valve core (142) away from the valve seat (143), so as to open the third opening to make the first opening and the second opening communicated.
2. The hydraulic line filter of claim 1, wherein: The contact surface between the valve core (142) and the valve seat (143) is a taper surface (146).
3. The hydraulic line filter of claim 2, wherein: 4. The hydraulic line filter of claim 3, wherein: The bypass valve (14) further comprises a ring-shaped baffle (147) and a first sealing ring (148), the inner side wall of the first opening is provided with a first mounting ring groove and a second mounting ring groove, the outer edge of the ring-shaped baffle (147) is mounted in the first mounting ring groove, the top surface of the ring-shaped baffle (147) is used for fixed connection with the valve seat (143), and the first sealing ring (148) is mounted in the second mounting ring groove, and the inner side edge of the first sealing ring (148) protrudes out of the second mounting ring groove and tightly seals the outer side wall of the valve seat (143).
5. The hydraulic line filter of claim 1, wherein: Further comprising a second sealing ring (21), the top of the cylinder body (2) is provided with external threads, the cylinder body mounting station is provided with internal threads and a third mounting ring groove, the external threads of the top of the cylinder body (2) are used for threaded connection with the internal threads of the cylinder body mounting station, and the second sealing ring (21) is used for mounting in the third mounting ring groove, and the inner side edge of the second sealing ring (21) protrudes out of the third mounting ring groove and tightly seals the outer side wall of the cylinder body (2).
6. The hydraulic line filter of claim 5, wherein: Further comprising a screw plug (22) and a gasket (23), the bottom end of the cylinder body (2) is a tapered end, the bottom of the tapered end is provided with a discharge screw hole, the screw plug (22) is used for threaded connection in the discharge screw hole, and the gasket (23) is used for sleeving on the outer side of the screw rod of the screw plug (22) and located between the screw cap of the screw plug (22) and the bottom end cylinder body (2).
7. The hydraulic line filter of claim 1, wherein: The filter head (1) further comprises a first exhaust pressure measuring connector (15) and a second exhaust pressure measuring connector (16), the first exhaust pressure measuring connector (15) is used for detachable connection with the top of the oil inlet pipeline (11) and communication with the oil inlet pipeline (11) to measure the pressure of the oil inlet pipeline (11), and the second exhaust pressure measuring connector (16) is used for detachable connection with the top of the oil outlet pipeline (12) and communication with the oil outlet pipeline (12) to measure the pressure of the oil outlet pipeline (12).
8. The hydraulic line filter of claim 7, wherein: The filter head (1) further comprises a transmitter (17), the transmitter (17) is in signal connection with the first exhaust pressure measuring connector (15) and the second exhaust pressure measuring connector (16), and can send an alarm signal when the pressure difference measured by the first exhaust pressure measuring connector (15) and the second exhaust pressure measuring connector (16) reaches a preset value.
9. The hydraulic line filter of claim 1, wherein: The filter element (3) comprises an upper cover (31), a lower cover (32) and a cylindrical filter material (33), the middle part of the upper cover (31) is provided with a fourth opening, the fourth opening is sealingly mounted in the filter element mounting station, the lower cover (32) is arranged in parallel with the upper cover (31), and the top end and the bottom end of the cylindrical filter material (33) are adhesively fixed with the upper cover (31) and the lower cover (32) respectively to form the second inner cavity in the inner side of the cylindrical filter material (33).
10. The hydraulic line filter of claim 9, wherein: The filter core (3) further comprises a cylindrical frame (34) and a third sealing ring (35), a first protrusion (36) is arranged on the middle part of the upper cover (31) downward, a second protrusion (37) is arranged on the middle part of the lower cover (32) upward, the cylindrical fixing frame is arranged on the inner side of the cylindrical filter material (33) closely, the top end of the cylindrical frame (34) is sleeved on the outer side of the first protrusion (36) and is bonded and fixed with the upper cover (31), the bottom end of the cylindrical frame (34) is sleeved on the outer side of the second protrusion (37) and is bonded and fixed with the lower cover (32), the top part of the upper cover (31) is provided with a fourth mounting ring groove, the third sealing ring (35) is mounted in the fourth mounting ring groove and the inner side edge of the third sealing ring (35) protrudes out of the fourth mounting ring groove and seals and presses against the filter core mounting station.