A hydraulic check valve

Abstract

The present invention relates to the technical field of check valves, and particularly to a hydraulic check valve. The hydraulic check valve includes an upper valve body, a protective cover, a lower valve body, an external sealing ring, a valve core, a compression spring, an internal sealing ring, a circular filter assembly and four waste discharge mechanisms. The circular filter assembly includes four telescopic members and a circular filter element. Each waste discharge mechanism includes a waste discharge assembly and a stuffing assembly. The circular filter assembly can filter impurities in the oil fluid, complete the purification and cooling of the oil fluid. The waste discharge assembly of the waste discharge mechanism can collect the impurities filtered by the circular filter assembly, extend the service time of the circular filter assembly. The stuffing assembly can not only collect the impurities filtered by the circular filter assembly, but also push out the waste discharge assembly after the waste discharge assembly is blocked, thereby continuing to collect the impurities filtered by the circular filter assembly, extending the service time of the circular filter assembly again, and reducing the maintenance difficulty of the hydraulic check valve.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and particularly to a hydraulic check valve. Background Art

[0002] A hydraulic check valve is an important control component in a hydraulic system, mainly used to control the unidirectional flow of hydraulic oil. The hydraulic check valve mainly consists of a valve body, a valve core, a spring, etc. The valve body is the outer shell of the check valve, usually made of high-strength metal materials to withstand the high pressure in the hydraulic system. The valve core is the key component for controlling the flow of oil. Common forms of the valve core include ball type and cone valve type. The spring is used to keep the valve core closed when there is no oil pressure or the oil flows in the reverse direction. In the current hydraulic system, when there is no filter, the oil is prone to clogging with impurities, which may cause damage to the hydraulic check valve. And when a filter screen is installed inside the hydraulic check valve, the maintenance steps are complex and difficult after the filter screen is clogged. Summary of the Invention

[0003] Based on this, it is necessary to provide a hydraulic check valve to solve at least one of the above technical problems.

[0004] A hydraulic check valve includes an upper valve body, a protective cover, a lower valve body, an external sealing ring, a valve core, a compression spring, an internal sealing ring, a circular filter screen assembly, and four waste discharge mechanisms. The protective cover is sleeved in the middle of the upper valve body. The top of the lower valve body is inserted into the lower end of the upper valve body. The external sealing ring is sleeved in the middle of the upper valve body, and the external sealing ring is located between the protective cover and the lower valve body. The valve core, the compression spring, and the internal sealing ring are all received inside the lower valve body. The top of the valve core is inserted into the bottom of the upper valve body. A clamping groove is formed at the bottom of the valve core. The upper end of the compression spring is clamped in the clamping groove. The internal sealing ring is clamped in the middle of the valve core. A liquid inlet groove is formed at the center of the top of the upper valve body. A valve core groove is formed at the center of the bottom of the upper valve body. The valve core groove is communicated with the liquid inlet groove. A fixing ring is installed on the side wall at the lower end of the liquid inlet groove. The circular filter screen assembly is received in the liquid inlet groove, and the circular filter screen assembly is abutted and installed on the top of the fixing ring. The four waste discharge mechanisms are all slidably inserted through the protective cover and the upper valve body in sequence. The circular filter screen assembly includes four telescopic members and a circular filter screen member. The lower ends of the four telescopic members all abut on the top of the fixing ring. The bottom periphery of the circular filter screen member is fixedly connected to the upper ends of the four telescopic members. Each waste discharge mechanism includes a waste discharge assembly and a stuffing assembly. The waste discharge assembly is slidably inserted through the protective cover and the upper valve body in sequence. The stuffing assembly is slidably inserted through the inside of the upper valve body, and one end of the stuffing assembly abuts against the waste discharge assembly.

[0005] The valve core is used to block the valve core groove to prevent the reverse flow of oil. The compression spring is used to cooperate with the valve core, so that the oil can only flow unidirectionally. The internal sealing ring can prevent the leakage of oil. The circular filter screen assembly can filter the impurities in the oil, complete the purification and cooling of the oil, and then extend the service time of the oil, save costs. The waste discharge assembly of the waste discharge mechanism can collect the impurities filtered by the circular filter screen assembly, extend the service time of the circular filter screen assembly. The stuffing assembly can not only collect the impurities filtered by the circular filter screen assembly, but also push out the waste discharge assembly after the waste discharge assembly is blocked, and then continue to collect the impurities filtered by the circular filter screen assembly, extend the service time of the circular filter screen assembly again, and reduce the maintenance difficulty of the hydraulic check valve.

[0006] In one embodiment, four insertion grooves are formed in the outer side wall of the middle part of the upper valve body. The four insertion grooves all penetrate the surface of the outer side wall of the upper valve body. The side wall of each insertion groove is provided with a first spring groove. The side wall of the first spring groove is provided with a liquid inlet groove, and the liquid inlet groove penetrates the inner side wall of the middle part of the upper valve body. The upper side wall of each insertion groove is provided with an L-shaped upper passage groove. One end of the upper passage groove is communicated with the corresponding insertion groove, and the other end of the upper passage groove penetrates the surface of the inner side wall of the upper valve body. The lower side wall of each insertion groove is provided with an L-shaped lower passage groove. One end of the lower passage groove is communicated with the corresponding insertion groove, and the other end of the lower passage groove penetrates the surface of the inner side wall of the upper valve body, and the upper passage groove is located above the lower passage groove.

[0007] In one embodiment, a receiving groove is formed in the top side wall of the lower valve body. The receiving groove penetrates the top side wall of the lower valve body. The bottom side wall of the receiving groove is provided with a second spring groove. The bottom side wall of the second spring groove is provided with a liquid outlet groove, and the liquid outlet groove penetrates the surface of the bottom side wall of the lower valve body.

[0008] In one embodiment, the bottom of the lower valve body is inserted into the receiving groove. The valve core, the compression spring and the internal sealing ring are all received in the receiving groove. The valve core is slidably inserted into the valve core groove. The lower end of the compression spring is inserted into the second spring groove. The internal sealing ring is sleeved on the middle part of the valve core, and the top of the internal sealing ring abuts against the bottom side wall of the valve core groove.

[0009] In one embodiment, each telescopic member includes an upper connecting rod and a lower connecting rod. The top of the upper connecting rod is fixedly connected to the bottom periphery of the circular filter screen member. The bottom of the lower connecting rod abuts against the top of the fixing ring. The lower end of the upper connecting rod is slidably inserted into the top of the lower connecting rod. The upper connecting rod and the lower connecting rod are internally hollow and receive a compression spring. The upper end of the compression spring is received and abutted in the upper connecting rod, and the lower end of the compression spring is received and abutted in the lower connecting rod.

[0010] In one embodiment, the circular filter member includes a circular filter screen and an annular baffle. The bottom of the circular filter screen is fixedly connected to the top of the upper connecting rod. The annular baffle is installed on the peripheral edge of the bottom of the circular filter screen, and the annular baffle slidably abuts against the side wall of the liquid inlet groove. The height of the outer peripheral edge of the top of the circular filter screen gradually increases towards the center height of the top of the circular filter screen. The annular baffle can prevent the oil liquid from entering the liquid inlet groove when the circular filter member is not blocked, thereby preventing the oil liquid from hitting the connecting plate after entering the liquid inlet groove and causing the waste collection member to be disengaged from the insertion groove.

[0011] In one embodiment, each waste discharge assembly includes a waste collection member and a circular connecting ring. One end of the waste collection member is sequentially slidably inserted into the protective cover and the insertion groove, and the side wall of the connecting ring is fixedly connected to the other end of the waste collection member.

[0012] In one embodiment, the waste collection member includes a connecting column and a collection filter screen. One end of the connecting column is sequentially slidably inserted into the protective cover and the insertion groove, and the other end of the connecting column is connected to the side wall of the connecting ring. One end of the collection filter screen is connected to the end of one end of the connecting column, and an oil inlet is provided at one end of the collection filter screen adjacent to the stuffing assembly.

[0013] In one embodiment, the stuffing assembly includes a stuffing member and a stuffing spring. The stuffing member is slidably inserted into the middle of the insertion groove, and one end of the stuffing member abuts against the other end of the collection filter screen. One end of the stuffing spring is inserted into the first spring groove, and the other end of the stuffing spring is sleeved on the other end of the stuffing member.

[0014] In one embodiment, the stuffing member includes a contact rod, a connecting plate, a blocking plate, a pressure-bearing filter screen, a connecting cover and a spring fixing rod. One end of the contact rod abuts against the other end of the collection filter screen. One end of the connecting plate is fixedly connected to the other end of the contact rod. The blocking plate is fixedly installed on the top of the connecting plate, and the top of the blocking plate slidably abuts against the top side wall of the insertion groove. One end of the pressure-bearing filter screen is fixedly installed on the other end of the blocking plate. The connecting cover covers the other end of the pressure-bearing filter screen. One end of the spring fixing rod is fixedly installed on the side wall of the connecting cover, and the other end of the spring fixing rod faces the liquid inlet groove. The caliber of the liquid inlet groove is smaller than the caliber of the first spring groove. The stuffing spring is sleeved on the outside of the spring fixing rod. An arc-shaped clamping block is installed on the top side wall of the insertion groove, and one end of the top of the blocking plate abuts against the clamping block.

[0015] In the present invention, by providing a collecting filter screen, when the hydraulic check valve is working, the hydraulic oil will be filtered through the circular filter element of the circular filter screen to make the hydraulic oil cleaner, and then the hydraulic oil can better complete the work. After a long time of use, the circular filter screen on the circular filter element will be blocked, and the impact on the circular filter screen will increase. The circular filter screen will move towards the side of the valve core. The circular filter screen will push against the upper connecting rod and move it downward. When the upper connecting rod moves downward, it will compress the compression spring. When the height of the outer periphery of the top of the circular filter screen is aligned with the upper passage groove, the impurities on the top of the circular filter screen can be collected in the collecting filter screen through the upper passage groove. At the same time, the collecting filter screen can filter the oil in the impurities, so that the oil in the impurities returns to the liquid inlet groove through the lower passage groove. After the impurities on the top of the circular filter screen enter the collecting filter screen, the circular filter screen will be partially unblocked, so that the impact on the circular filter screen will become smaller. Under the action of the restoring force of the compression spring, the circular filter screen will move away from the side of the valve core. This process is repeated to extend the service life of the circular filter screen, reduce the cleaning frequency of the circular filter screen, and thus reduce the manpower.

[0016] By providing the lower passage groove, after the collecting filter screen is blocked and the circular filter screen is blocked, the impact on the circular filter screen will increase. The circular filter screen will move towards the side of the valve core. The circular filter screen will push against the upper connecting rod and move it downward. When the upper connecting rod moves downward, it will compress the compression spring. When the top of the circular filter screen is flush with the liquid inlet groove, the middle part of the side wall of the circular filter screen abuts against the lower passage groove. The impurities on the top of the circular filter screen can be collected in the pressure-bearing filter screen through the liquid inlet groove and the first spring groove in sequence. At the same time, the pressure-bearing filter screen can filter the oil in the impurities, so that the oil in the impurities enters the lower passage groove, and the oil flushes out from the lower passage groove to impact the middle part of the side wall of the circular filter screen, disturbing the impurities adsorbed inside the circular filter screen and unblocking the circular filter screen. After the circular filter screen is unblocked, the impurities on the top of the circular filter screen are disturbed, so that the impurities on the top of the circular filter screen can enter the pressure-bearing filter screen more thoroughly, extending the service life of the circular filter screen, reducing the cleaning frequency of the circular filter screen, and thus reducing the manpower.

[0017] By providing the pressure-bearing filter screen, the compression spring and the collecting filter screen, after the pressure-bearing filter screen is blocked, the impact on the end of the pressure-bearing filter screen away from the connecting cover increases. After the upper passage groove is blocked and the collecting filter screen is blocked, since the oil inlet is opened at the end away from the connecting column, the impact force on the end of the collecting filter screen adjacent to the connecting column is relatively large. Under the impact of the pressure-bearing filter screen, the restoring force of the stuffing spring and the impact of the collecting filter screen, the blocking plate disengages from the abutment of the clamping block, and the abutting rod will push open the waste collecting part. The waste collecting part extends out and is clamped at the end of the insertion groove away from the connecting cover to remind the staff to clean. At the same time, after the abutting rod pushes open the waste collecting part, the blocking plate will block the upper passage groove to prevent the oil from flowing out of the upper passage groove.

[0018] By setting up a waste collection part, after cleaning the waste collection part, the waste collection part is reinserted into the insertion slot. The collection filter screen will push the connecting plate to move towards the liquid inlet tank side, the stuffing spring is compressed, and finally the top end of the blocking plate abuts against the clamping block. The oil liquid above the circular filter screen rushes out through the upper passage groove, the collection filter screen and the lower passage groove, and is used to impact the middle part of the side wall of the circular filter screen, so that the impurities adsorbed inside the circular filter screen are further disturbed, and the circular filter screen is dredged. After the circular filter screen is dredged, the impurities on the top of the circular filter screen are disturbed, so that the impurities on the top of the circular filter screen can enter the pressure-bearing filter screen more thoroughly. After the circular filter screen is dredged, the impact on the circular filter screen becomes smaller. Under the action of the restoring force of the compression spring, the circular filter screen will move towards the side away from the valve core, and so on, so as to extend the service life of the circular filter screen, reduce the cleaning times of the circular filter screen, and thus reduce the labor force.

[0019] The structure of the present invention is simple, and it can filter impurities in the oil liquid well, complete the purification and cooling of the oil liquid, extend the service life of the oil liquid, save costs, and at the same time, the filter screen can be cleaned without disassembling the hydraulic check valve, thereby extending the service life of the filter screen and reducing the maintenance difficulty of the hydraulic check valve. Brief Description of the Drawings

[0020] Figure 1 It is a three-dimensional schematic diagram of the whole of an embodiment.

[0021] Figure 2 It is a sectional view of the whole of an embodiment.

[0022] Figure 3 It is an exploded view of the whole of an embodiment.

[0023] Figure 4 It is an embodiment Figure 2 The enlarged schematic diagram of part A in.

[0024] Figure 5 It is a three-dimensional schematic diagram of the circular filter screen assembly and the waste discharge mechanism of an embodiment.

[0025] Figure 6 It is a three-dimensional schematic diagram of part of the waste discharge mechanism of an embodiment.

[0026] In the figure: 10. Upper valve body; 11. Protective cover; 12. Lower valve body; 13. External sealing ring; 14. Valve core; 15. Extrusion spring; 16. Internal sealing ring; 17. Fixed ring; 100. Liquid inlet groove; 101. Valve core groove; 102. Insertion groove; 103. First spring groove; 104. Liquid inlet groove; 105. Upper passage groove; 106. Lower passage groove; 120. Storage groove; 121. Second spring groove; 122. Liquid outlet groove; 140. Positioning groove; 20. Circular filter assembly; 21. Telescopic member; 22. Circular filter element; 210. Upper connecting rod; 211. Lower connecting rod; 220. Circular filter; 221. Annular baffle; 30. Waste discharge mechanism; 31. Waste discharge assembly; 32. Filling assembly; 310. Waste collection member; 311. Connecting ring; 312. Connecting column; 313. Collection filter; 314. Oil inlet; 320. Filling member; 321. Filling spring; 322. Abutting rod; 323. Connecting plate; 324. Blocking plate; 325. Pressure-bearing filter; 326. Connecting cover; 327. Spring fixing rod; 328. Positioning block. Detailed implementation mode

[0027] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] An embodiment provided by the present invention is as Figures 1 to 6As shown in the figure, there is a hydraulic check valve, which includes an upper valve body 10, a protective cover 11, a lower valve body 12, an external sealing ring 13, a valve core 14, a compression spring 15, an internal sealing ring 16, a circular filter assembly 20 and four waste discharge mechanisms 30. The protective cover 11 is sleeved on the middle part of the upper valve body 10. The top of the lower valve body 12 is inserted into the lower end of the upper valve body 10. The external sealing ring 13 is sleeved on the middle part of the upper valve body 10, and the external sealing ring 13 is located between the protective cover 11 and the lower valve body 12. The valve core 14, the compression spring 15 and the internal sealing ring 16 are all received inside the lower valve body 12. The top of the valve core 14 is inserted into the bottom of the upper valve body 10. A clamping groove 140 is formed at the bottom of the valve core 14. The upper end of the compression spring 15 is clamped in the clamping groove 140. The internal sealing ring 16 is clamped in the middle of the valve core 14. A liquid inlet groove 100 is formed at the center of the top of the upper valve body 10. A valve core groove 101 is formed at the center of the bottom of the upper valve body 10. The valve core groove 101 is communicated with the liquid inlet groove 100. A fixing ring 17 is installed on the side wall at the lower end of the liquid inlet groove 100. The circular filter assembly 20 is received in the liquid inlet groove 100, and the circular filter assembly 20 is abutted and installed on the top of the fixing ring 17. The four waste discharge mechanisms 30 are all slidably inserted through the protective cover 11 and the upper valve body 10 in sequence. The circular filter assembly 20 includes four telescopic members 21 and a circular filter member 22. The lower ends of the four telescopic members 21 all abut on the top of the fixing ring 17. The bottom periphery of the circular filter member 22 is fixedly connected to the upper ends of the four telescopic members 21. Each waste discharge mechanism 30 includes a waste discharge assembly 31 and a stuffing assembly 32. The waste discharge assembly 31 is slidably inserted through the protective cover 11 and the upper valve body 10 in sequence. The stuffing assembly 32 is slidably inserted through the inside of the upper valve body 10, and one end of the stuffing assembly 32 abuts on the waste discharge assembly 31.

[0031] The valve core 14 is used to block the valve core groove 101 to prevent the reverse flow of oil. The compression spring 15 is used to cooperate with the valve core 14, so that the oil can only flow unidirectionally. The internal sealing ring 16 can prevent the leakage of oil. The circular filter assembly 20 can filter the impurities in the oil, complete the purification and cooling of the oil, and then extend the service time of the oil and save costs. The waste discharge assembly 31 of the waste discharge mechanism 30 can collect the impurities filtered by the circular filter assembly 20 and extend the service time of the circular filter assembly 20. The stuffing assembly 32 can not only collect the impurities filtered by the circular filter assembly 20, but also push out the waste discharge assembly 31 after the waste discharge assembly 31 is blocked, so as to continue to collect the impurities filtered by the circular filter assembly 20, extend the service time of the circular filter assembly 20 again, and reduce the maintenance difficulty of the hydraulic check valve.

[0032] As Figures 1 to 6As shown in the figure, four insertion slots 102 are provided on the outer side wall of the middle part of the upper valve body 10. The four insertion slots 102 all penetrate through the surface of the outer side wall of the upper valve body 10. A first spring groove 103 is provided on the side wall of each insertion slot 102, and a liquid inlet groove 104 is provided on the side wall of the first spring groove 103. The liquid inlet groove 104 penetrates through the inner side wall of the middle part of the upper valve body 10. An L-shaped upper passage groove 105 is provided on the upper side wall of each insertion slot 102. One end of the upper passage groove 105 is communicated with the corresponding insertion slot 102, and the other end of the upper passage groove 105 penetrates through the surface of the inner side wall of the upper valve body 10. An L-shaped lower passage groove 106 is provided on the lower side wall of each insertion slot 102. One end of the lower passage groove 106 is communicated with the corresponding insertion slot 102, and the other end of the lower passage groove 106 penetrates through the surface of the inner side wall of the upper valve body 10, and the upper passage groove 105 is located above the lower passage groove 106.

[0033] As Figure 2 shown, a receiving groove 120 is provided on the top side wall of the lower valve body 12. The receiving groove 120 penetrates through the top side wall of the lower valve body 12. A second spring groove 121 is provided on the bottom side wall of the receiving groove 120, and a liquid outlet groove 122 is provided on the bottom side wall of the second spring groove 121. The liquid outlet groove 122 penetrates through the surface of the bottom side wall of the lower valve body 12.

[0034] As Figure 2 shown, the bottom of the lower valve body 12 is inserted into the receiving groove 120. The valve core 14, the compression spring 15 and the inner sealing ring 16 are all received in the receiving groove 120. The valve core 14 is slidably inserted into the valve core groove 101. The lower end of the compression spring 15 is inserted into the second spring groove 121. The inner sealing ring 16 is sleeved on the middle part of the valve core 14, and the top of the inner sealing ring 16 abuts against the bottom side wall of the valve core groove 101.

[0035] As Figures 2 to 5 shown, each telescopic member 21 includes an upper connecting rod 210 and a lower connecting rod 211. The top of the upper connecting rod 210 is fixedly connected to the bottom periphery of the circular filter member 22. The bottom of the lower connecting rod 211 abuts against the top of the fixing ring 17. The lower end of the upper connecting rod 210 is slidably inserted into the top of the lower connecting rod 211. A compression spring (not shown in the figure) is received in the hollow interior of the upper connecting rod 210 and the lower connecting rod 211. The upper end of the compression spring is received and abuts in the upper connecting rod 210, and the lower end of the compression spring is received and abuts in the lower connecting rod 211.

[0036] As Figures 2 to 5As shown, the circular filter element 22 includes a circular filter screen 220 and an annular baffle 221. The bottom of the circular filter screen 220 is fixedly connected to the top of the upper connecting rod 210. The annular baffle 221 is installed on the peripheral edge of the bottom of the circular filter screen 220 and slidably abuts against the side wall of the liquid inlet groove 100. The height of the outer peripheral edge of the top of the circular filter screen 220 gradually increases towards the center height of the top of the circular filter screen 220. The annular baffle 221 can prevent the oil from entering the liquid inlet groove 104 when the circular filter element 22 is not blocked, thereby preventing the oil from hitting the connecting plate 323 after entering the liquid inlet groove 104 and causing the waste collection member 310 to fall out of the insertion groove 102.

[0037] As Figures 2 to 5 shown, each waste discharge assembly 31 includes a waste collection member 310 and a circular connecting ring 311. One end of the waste collection member 310 is sequentially and slidably inserted into the protective cover 11 and the insertion groove 102, and the side wall of the connecting ring 311 is fixedly connected to the other end of the waste collection member 310.

[0038] As Figures 4 to 6 shown, the waste collection member 310 includes a connecting column 312 and a collection filter screen 313. One end of the connecting column 312 is sequentially and slidably inserted into the protective cover 11 and the insertion groove 102, and the other end of the connecting column 312 is connected to the side wall of the connecting ring 311. One end of the collection filter screen 313 is connected to the end of one end of the connecting column 312, and an oil inlet 314 is provided at one end of the collection filter screen 313 adjacent to the stuffing assembly 32 at the top.

[0039] As Figures 4 to 6 shown, the stuffing assembly 32 includes a stuffing member 320 and a stuffing spring 321. The stuffing member 320 is slidably inserted into the middle of the insertion groove 102, and one end of the stuffing member 320 abuts against the other end of the collection filter screen 313. One end of the stuffing spring 321 is inserted into the first spring groove 103, and the other end of the stuffing spring 321 is sleeved on the other end of the stuffing member 320.

[0040] As Figures 2 to 6As shown, the stuffing member 320 includes an abutting rod 322, a connecting plate 323, a blocking plate 324, a pressure-bearing filter screen 325, a connecting cover 326, and a spring fixing rod 327. One end of the abutting rod 322 abuts against the other end of the collecting filter screen 313. One end of the connecting plate 323 is fixedly connected to the other end of the abutting rod 322. The blocking plate 324 is fixedly installed on the top of the connecting plate 323, and the top of the blocking plate 324 slidably abuts against the top side wall of the insertion slot 102. One end of the pressure-bearing filter screen 325 is fixedly installed on the other end of the blocking plate 324. The connecting cover 326 covers the other end of the pressure-bearing filter screen 325. One end of the spring fixing rod 327 is fixedly installed on the side wall of the connecting cover 326, and the other end of the spring fixing rod 327 faces the liquid inlet groove 104. The caliber of the liquid inlet groove 104 is smaller than that of the first spring groove 103. The stuffing spring 321 is sleeved outside the spring fixing rod 327. An arc-shaped clamping block 328 is installed on the top side wall of the insertion slot 102, and the top of one end of the blocking plate 324 abuts against the clamping block 328.

[0041] During installation: The circular filter screen assembly 20 is abutted and installed on the top of the fixing ring 17. The lower ends of the four telescopic members 21 all abut against the top of the fixing ring 17. The blocking plate 324 is fixedly installed on the top of the connecting plate 323. One end of the pressure-bearing filter screen 325 is fixedly installed on the other end of the blocking plate 324. One end of the spring fixing rod 327 is fixedly installed on the side wall of the connecting cover 326.

[0042] During use: 1. Install the hydraulic check valve in the hydraulic system. The stuffing assemblies 32 and the waste discharge assemblies 31 of the four waste discharge mechanisms 30 are sequentially inserted into the insertion slot 102. When the hydraulic system starts to transport hydraulic oil, the hydraulic oil will push the valve core 14 to move towards the side of the compression spring 15. When the valve core 14 moves towards the side of the compression spring 15, the compression spring 15 is compressed and opened, so that the liquid inlet groove 100, the valve core groove 101, the storage groove 120, the second spring groove 121, and the liquid outlet groove 122 are communicated, and thus the hydraulic oil can move in the hydraulic check valve.

[0043] 2. When the hydraulic check valve is working, the hydraulic oil will be filtered by the circular filter element 22 to make the hydraulic oil cleaner, so that the hydraulic oil can better complete the work. After a long time of use, the circular filter 220 on the circular filter element 22 will be blocked, and the impact on the circular filter 220 will increase. The circular filter 220 will move towards the side of the valve core 14. The circular filter 220 will push against the upper connecting rod 210 and move downward. When the upper connecting rod 210 moves downward, it will compress the compression spring. The height of the outer peripheral edge of the top of the circular filter 220 gradually becomes higher towards the center height of the top of the circular filter 220, that is, the top of the circular filter 220 is in an umbrella shape, so that the impurities on the top of the circular filter 220 can accumulate on the outer peripheral edge of the top of the circular filter 220. When the height of the outer peripheral edge of the top of the circular filter 220 is aligned with the upper through groove 105, the impurities on the top of the circular filter 220 can be collected in the collecting filter 313 through the upper through groove 105. At the same time, the collecting filter 313 can filter the oil in the impurities, so that the oil in the impurities returns to the liquid inlet groove 100 through the lower through groove 106. After the impurities on the top of the circular filter 220 enter the collecting filter 313, the circular filter 220 will be partially dredged, so that the impact on the circular filter 220 becomes smaller. Under the action of the restoring force of the compression spring, the circular filter 220 will move towards the side away from the valve core 14. This process is repeated to extend the service life of the circular filter 220, reduce the cleaning frequency of the circular filter 220, and thus reduce labor.

[0044] 3. After the collecting filter 313 is blocked, the circular filter 220 is blocked, and the impact on the circular filter 220 increases. The circular filter 220 will move towards the side of the valve core 14. The circular filter 220 will push against the upper connecting rod 210 and move downward. When the upper connecting rod 210 moves downward, it will compress the compression spring. When the top of the circular filter 220 is flush with the liquid inlet groove 104, the middle part of the side wall of the circular filter 220 abuts against the lower through groove 106. The impurities on the top of the circular filter 220 can be collected in the pressure-bearing filter 325 through the liquid inlet groove 104 and the first spring groove 103 in sequence. At the same time, the pressure-bearing filter 325 can filter the oil in the impurities, so that the oil in the impurities enters the lower through groove 106. The oil rushes out from the lower through groove 106 to impact the middle part of the side wall of the circular filter 220, disturbing the impurities adsorbed inside the circular filter 220 and dredging the circular filter 220. After the circular filter 220 is dredged, the impurities on the top of the circular filter 220 are disturbed, so that the impurities on the top of the circular filter 220 can enter the pressure-bearing filter 325 more thoroughly, extending the service life of the circular filter 220, reducing the cleaning frequency of the circular filter 220, and thus reducing labor.

[0045] 4. After the pressure-bearing filter screen 325 is blocked, the impact on the end of the pressure-bearing filter screen 325 away from the connection cover 326 becomes larger. After the upper passage groove 105 is blocked and the collection filter screen 313 is blocked, since the oil inlet 314 is opened at the end away from the connection column 312, the impact force on the end of the collection filter screen 313 adjacent to the connection column 312 is relatively large. Under the impact of the pressure-bearing filter screen 325, the restoring force of the stuffing spring 321, and the impact of the collection filter screen 313, the blocking plate 324 disengages from the abutment of the clamping block 328, and the abutting rod 322 will push open the waste collection member 310. The waste collection member 310 extends out and is clamped at the end of the insertion groove 102 away from the connection cover 326, for reminding the staff to perform cleaning. At the same time, after the abutting rod 322 pushes open the waste collection member 310, the blocking plate 324 will block the upper passage groove 105 to prevent the oil fluid from flowing out of the upper passage groove 105.

[0046] 5. After cleaning the waste collection member 310, insert the waste collection member 310 back into the insertion groove 102. The collection filter screen 313 will push the connecting plate 323 to move towards the liquid inlet groove 104 side, compressing the stuffing spring 321. Finally, the top of one end of the blocking plate 324 abuts against the clamping block 328. The oil fluid above the circular filter screen 220 flushes out after passing through the upper passage groove 105, the collection filter screen 313, and the lower passage groove 106, for impacting the middle part of the side wall of the circular filter screen 220, so that the impurities adsorbed inside the circular filter screen 220 are further disturbed, dredging the circular filter screen 220. After the circular filter screen 220 is dredged, the impurities on the top of the circular filter screen 220 are disturbed, so that the impurities on the top of the circular filter screen 220 can enter the pressure-bearing filter screen 325 more thoroughly. After the circular filter screen 220 is dredged, the impact on the circular filter screen 220 becomes smaller. Under the action of the restoring force of the compression spring, the circular filter screen 220 will move towards the side away from the valve core 14. Repeating this way can extend the service life of the circular filter screen 220, reduce the cleaning frequency of the circular filter screen 220, and thus reduce the labor force.

[0047] 6. After the hydraulic check valve stops working, the connection ring 311 can be squeezed forcefully to compress the stuffing spring 321 to the limit. Then, pull out the connection ring 311 instantly. Under the action of the restoring force of the stuffing spring 321, the blocking plate 324 will quickly pass through the clamping block 328, and then the abutting rod 322 will extend out of the external part of the insertion groove 102. By holding the abutting rod 322, the stuffing member 320 can be pulled out, and then the stuffing member 320 can be cleaned. Thus, the circular filter screen 220 can be cleaned without disassembling the hydraulic check valve, reducing the maintenance difficulty of the hydraulic check valve.

[0048] In the present invention, by providing a collecting filter screen 313, when the hydraulic check valve is working, the hydraulic oil will be filtered by the circular filter element 22 to make the hydraulic oil cleaner, so that the hydraulic oil can complete the work better. After a long time of use, the circular filter screen 220 on the circular filter element 22 will be blocked, and the impact on the circular filter screen 220 becomes larger. The circular filter screen 220 will move towards the side of the valve core 14. The circular filter screen 220 will push against the upper connecting rod 210 and move it downward. When the upper connecting rod 210 moves downward, it will compress the compression spring. When the height of the outer peripheral edge of the top of the circular filter screen 220 is aligned with the upper passage groove 105, the impurities on the top of the circular filter screen 220 can be collected in the collecting filter screen 313 through the upper passage groove 105. At the same time, the collecting filter screen 313 can filter the oil in the impurities, so that the oil in the impurities returns to the liquid inlet groove 100 through the lower passage groove 106. After the impurities on the top of the circular filter screen 220 enter the collecting filter screen 313, the circular filter screen 220 will be partially unblocked, so that the impact on the circular filter screen 220 becomes smaller. Under the action of the restoring force of the compression spring, the circular filter screen 220 will move towards the side away from the valve core 14. This process is repeated to extend the service life of the circular filter screen 220, reduce the cleaning frequency of the circular filter screen 220, and thus reduce the labor force.

[0049] By providing the lower passage groove 106, after the collecting filter screen 313 is blocked and the circular filter screen 220 is blocked, the impact on the circular filter screen 220 becomes larger. The circular filter screen 220 will move towards the side of the valve core 14. The circular filter screen 220 will push against the upper connecting rod 210 and move it downward. When the upper connecting rod 210 moves downward, it will compress the compression spring. When the top of the circular filter screen 220 is flush with the liquid inlet groove 104, the middle part of the side wall of the circular filter screen 220 abuts against the lower passage groove 106. The impurities on the top of the circular filter screen 220 can be collected in the pressure-bearing filter screen 325 through the liquid inlet groove 104 and the first spring groove 103 in sequence. At the same time, the pressure-bearing filter screen 325 can filter the oil in the impurities, so that the oil in the impurities enters the lower passage groove 106. The oil flushes out from the lower passage groove 106 to impact the middle part of the side wall of the circular filter screen 220, so that the impurities adsorbed inside the circular filter screen 220 are disturbed and the circular filter screen 220 is unblocked. After the circular filter screen 220 is unblocked, the impurities on the top of the circular filter screen 220 are disturbed, so that the impurities on the top of the circular filter screen 220 can enter the pressure-bearing filter screen 325 more thoroughly, to extend the service life of the circular filter screen 220, reduce the cleaning frequency of the circular filter screen 220, and thus reduce the labor force.

[0050] By setting the pressure-bearing filter screen 325, compression spring and collection filter screen 313, after the pressure-bearing filter screen 325 is blocked, the impact on the end of the pressure-bearing filter screen 325 away from the connection cover 326 becomes larger. After the upper passage groove 105 is blocked and the collection filter screen 313 is blocked, since the oil inlet 314 is opened at the end away from the connection column 312, the impact force on the end of the collection filter screen 313 adjacent to the connection column 312 is relatively large. Under the impact of the pressure-bearing filter screen 325, the restoring force of the stuffing spring 321 and the impact of the collection filter screen 313, the blocking plate 324 disengages from the abutment of the clamping block 328, and the abutting rod 322 will push open the waste collection member 310. The waste collection member 310 extends out and is clamped at the end of the insertion groove 102 away from the connection cover 326, used to remind the staff to perform cleaning. At the same time, after the abutting rod 322 pushes open the waste collection member 310, the blocking plate 324 will block the upper passage groove 105 to prevent the oil from flowing out of the upper passage groove 105.

[0051] By setting the waste collection member 310, after cleaning the waste collection member 310, the waste collection member 310 is reinserted into the insertion groove 102. The collection filter screen 313 will push the connecting plate 323 to move towards the liquid inlet groove 104 side, compressing the stuffing spring 321. Finally, the top of one end of the blocking plate 324 abuts against the clamping block 328. The oil above the circular filter screen 220 rushes out through the upper passage groove 105, the collection filter screen 313 and the lower passage groove 106, used to impact the middle part of the side wall of the circular filter screen 220, so that the impurities adsorbed inside the circular filter screen 220 are further disturbed, dredging the circular filter screen 220. After the circular filter screen 220 is dredged, the impurities on the top of the circular filter screen 220 are disturbed, and then the impurities on the top of the circular filter screen 220 can enter the pressure-bearing filter screen 325 more thoroughly. After the circular filter screen 220 is dredged, the impact on the circular filter screen 220 becomes smaller. Under the action of the restoring force of the compression spring, the circular filter screen 220 will move towards the side away from the valve core 14, and so on, so as to extend the service life of the circular filter screen 220, reduce the cleaning times of the circular filter screen 220, and thus reduce the labor force.

[0052] The structure of the present invention is simple, which can filter the impurities in the oil well, complete the purification and cooling of the oil, extend the service life of the oil, save costs, and at the same time, the cleaning of the filter screen can be completed without disassembling the hydraulic check valve, thereby extending the service life of the filter screen and reducing the maintenance difficulty of the hydraulic check valve.

[0053] All possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0054] The above-described embodiments merely represent several embodiments of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A hydraulic check valve, characterized in that: It includes an upper valve body (10), a protective cover (11), a lower valve body (12), an external sealing ring (13), a valve core (14), a compression spring (15), an internal sealing ring (16), a circular filter assembly (20) and four waste discharge mechanisms (30). The protective cover (11) is sleeved on the middle part of the upper valve body (10). The top of the lower valve body (12) is inserted into the lower end of the upper valve body (10). The external sealing ring (13) is sleeved on the middle part of the upper valve body (10), and the external sealing ring (13) is located between the protective cover (11) and the lower valve body (12). The valve core (14), the compression spring (15) and the internal sealing ring (16) are all received inside the lower valve body (12). The top of the valve core (14) is inserted into the bottom of the upper valve body (10). A clamping groove (140) is formed at the bottom of the valve core (14). The upper end of the compression spring (15) is clamped in the clamping groove (140). The internal sealing ring (16) is clamped in the middle of the valve core (14). A liquid inlet groove (100) is formed at the center of the top of the upper valve body (10). A valve core groove (101) is formed at the center of the bottom of the upper valve body (10). The valve core groove (101) is communicated with the liquid inlet groove (100). A fixing ring (17) is installed on the side wall of the lower end of the liquid inlet groove (100). The circular filter assembly (20) is received in the liquid inlet groove (100), and the circular filter assembly (20) is abutted and installed on the top of the fixing ring (17). The four waste discharge mechanisms (30) are all sequentially slidably inserted through the protective cover (11) and the upper valve body (10). The circular filter assembly (20) includes four telescopic members (21) and a circular filter element (22). The lower ends of the four telescopic members (21) are all abutted against the top of the fixing ring (17). The bottom periphery of the circular filter element (22) is fixedly connected to the upper ends of the four telescopic members (21). Each waste discharge mechanism (30) includes a waste discharge assembly (31) and a stuffing assembly (32). The waste discharge assembly (31) is sequentially slidably inserted through the protective cover (11) and the upper valve body (10). The stuffing assembly (32) is slidably inserted through the inside of the upper valve body (10), and one end of the stuffing assembly (32) abuts against the waste discharge assembly (31); Four insertion grooves (102) are formed in the outer side wall of the middle part of the upper valve body (10). The four insertion grooves (102) all penetrate through the surface of the outer side wall of the upper valve body (10). A first spring groove (103) is formed in the side wall of each insertion groove (102). An inlet liquid groove (104) is formed in the side wall of the first spring groove (103). The inlet liquid groove (104) penetrates through the inner side wall of the middle part of the upper valve body (10). An L-shaped upper passage groove (105) is formed in the upper side wall of each insertion groove (102). One end of the upper passage groove (105) is communicated with the corresponding insertion groove (102), and the other end of the upper passage groove (105) penetrates through the surface of the inner side wall of the upper valve body (10). An L-shaped lower passage groove (106) is formed in the lower side wall of each insertion groove (102). One end of the lower passage groove (106) is communicated with the corresponding insertion groove (102), and the other end of the lower passage groove (106) penetrates through the surface of the inner side wall of the upper valve body (10), and the upper passage groove (105) is located above the lower passage groove (106); Each telescopic member (21) includes an upper connecting rod (210) and a lower connecting rod (211). The top of the upper connecting rod (210) is fixedly connected to the bottom periphery of the circular filter member (22). The bottom of the lower connecting rod (211) abuts against the top of the fixed ring (17). The lower end of the upper connecting rod (210) is slidably inserted into the top of the lower connecting rod (211). A compression spring is received in the hollow interior of the upper connecting rod (210) and the lower connecting rod (211). The upper end of the compression spring is received and abutted in the upper connecting rod (210), and the lower end of the compression spring is received and abutted in the lower connecting rod (211); The circular filter member (22) includes a circular filter (220) and an annular baffle (221). The bottom of the circular filter (220) is fixedly connected to the top of the upper connecting rod (210). The annular baffle (221) is installed on the bottom periphery of the circular filter (220), and the annular baffle (221) slidably abuts against the side wall of the liquid inlet groove (100). The height of the outer periphery of the top of the circular filter (220) gradually increases from the height of the outer periphery of the top of the circular filter (220) towards the center of the top of the circular filter (220); Each waste discharge assembly (31) includes a waste collection member (310) and a circular connecting ring (311). One end of the waste collection member (310) is sequentially slidably inserted into the protective cover (11) and the insertion groove (102). The side wall of the connecting ring (311) is fixedly connected to the other end of the waste collection member (310); The waste collection member (310) includes a connecting column (312) and a collection filter (313). One end of the connecting column (312) is sequentially slidably inserted into the protective cover (11) and the insertion groove (102), and the other end of the connecting column (312) is connected to the side wall of the connecting ring (311). One end of the collection filter (313) is connected to the end of one end of the connecting column (312), and an oil inlet (314) is formed at one end of the collection filter (313) adjacent to the stuffing assembly (32) at the top; The stuffing component (32) includes a stuffing piece (320) and a stuffing spring (321). The stuffing piece (320) is slidably inserted into the middle of the insertion groove (102), and one end of the stuffing piece (320) abuts against the other end of the collection filter screen (313). One end of the stuffing spring (321) is inserted into the first spring groove (103), and the other end of the stuffing spring (321) is sleeved on the other end of the stuffing piece (320). The stuffing piece (320) includes a contact rod (322), a connecting plate (323), a blocking plate (324), a pressure-bearing filter screen (325), a connecting cover (326) and a spring fixing rod (327). One end of the contact rod (322) abuts against the other end of the collection filter screen (313). One end of the connecting plate (323) is fixedly connected to the other end of the contact rod (322). The blocking plate (324) is fixedly installed on the top of the connecting plate (323), and the top of the blocking plate (324) slidably abuts against the top side wall of the insertion groove (102). One end of the pressure-bearing filter screen (325) is fixedly installed at the other end of the blocking plate (324). The connecting cover (326) covers the other end of the pressure-bearing filter screen (325). One end of the spring fixing rod (327) is fixedly installed on the side wall of the connecting cover (326), and the other end of the spring fixing rod (327) faces the liquid inlet groove (104). The caliber of the liquid inlet groove (104) is smaller than that of the first spring groove (103). The stuffing spring (321) is sleeved outside the spring fixing rod (327). An arc-shaped clamping block (328) is installed on the top side wall of the insertion groove (102), and one end of the top of the blocking plate (324) abuts against the clamping block (328).

2. The hydraulic check valve according to claim 1, wherein: A receiving groove (120) is formed in the top side wall of the lower valve body (12). The receiving groove (120) penetrates through the top side wall of the lower valve body (12). A second spring groove (121) is formed in the bottom side wall of the receiving groove (120). A liquid outlet groove (122) is formed in the bottom side wall of the second spring groove (121). The liquid outlet groove (122) penetrates through the surface of the bottom side wall of the lower valve body (12).

3. The hydraulic check valve according to claim 2, characterized in that: The bottom of the lower valve body (12) is inserted into the receiving groove (120). The valve core (14), the extrusion spring (15) and the inner sealing ring (16) are all received in the receiving groove (120). The valve core (14) is slidably inserted into the valve core groove (101). The lower end of the extrusion spring (15) is inserted into the second spring groove (121). The inner sealing ring (16) is sleeved on the middle of the valve core (14), and the top of the inner sealing ring (16) abuts against the bottom side wall of the valve core groove (101).

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