High frequency one-way valve with bidirectional buffering

Abstract

The utility model provides a high frequency one-way valve with two-way buffer, including valve sleeve, valve core, spring, end cover, the valve sleeve is the hollow structure of two ends opening, its inside communicates with pipe spare A cavity through first opening, simultaneously communicates with pipe spare B cavity through second opening, the first conical frustum hole, first cylinder hole of communicating is set up in the middle part of end cover axially, the valve core is located in the inside of valve sleeve, and the first conical frustum surface is established on the outer wall of head section's front end, and the first conical frustum surface can be sealed with the second conical frustum surface of the inner wall of valve sleeve near first opening, the outer wall of tail section is matched with the inner wall of valve sleeve, and the spring installation cavity of communicating with tail section front end outside is set up axially in tail section rear end, and the cylindrical buffer block of inserting cooperation with first cylinder hole is fixed in spring installation cavity inside, and spring cover is set in cylindrical buffer block outside, and its both ends are respectively with spring installation cavity inner wall, end cover front end abuts the interface, this design can avoid the impact of valve core and end cover when the single valve opens, reduces the noise.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic systems, and particularly relates to a high-frequency check valve with bidirectional buffering, which is suitable for solving the noise problem of opening and closing of the high-frequency check valve and greatly improving the service life of the valve. BACKGROUND

[0002] The check valve has the functions of one-way conduction and reverse sealing, is usually used for isolating oil and pressure, and is particularly used for cooperating with reciprocating volume matching cavities. The high-frequency check valve can form a high-reliability and high-pressure hydraulic pump, and the check valve is widely used in hydraulic systems. At present, the check valve is a pressure opening valve. Once the check valve is opened or closed, the hydraulic pressure acting on the valve core will be much greater than the spring force of the return spring, so that the valve core and the valve sleeve of the check valve collide, which not only forms abnormal noise, but also causes sealing failure due to high-frequency collision, and further causes loss of reverse sealing function. SUMMARY

[0003] The application aims to overcome the above problems in the prior art, and provides a high-frequency check valve with bidirectional buffering, which can effectively solve the noise problem of opening and closing of the high-frequency check valve and greatly improve the service life of the valve.

[0004] To achieve the above purpose, the application provides the following technical scheme.

[0005] A high-frequency check valve with bidirectional buffering, the check valve is installed in a pipe, comprising a valve sleeve, a valve core, a spring and an end cover, the valve sleeve is a hollow structure with two open ends, the front end outer wall of the valve sleeve is matched with the inner wall of the pipe, the rear end outer wall of the valve sleeve is matched with the front end of the end cover, the inside of the valve sleeve is communicated with the A cavity of the pipe through the first opening formed in the front end of the valve sleeve, and the inside of the valve sleeve is also communicated with the B cavity of the pipe through the second opening formed in the middle of the side wall of the valve sleeve, the middle of the end cover is axially provided with a first conical frustum hole and a first cylindrical hole, the small-diameter end and the large-diameter end of the first conical frustum hole are respectively communicated with the inside of the first cylindrical hole and the outside of the front end of the end cover, and the rear end of the end cover is matched with the outer wall of the pipe.

[0006] The valve core is axially arranged in the valve sleeve and comprises a head section, a transition section and a tail section, a first conical frustum surface is arranged on the outer wall of the front end of the head section, the first conical frustum surface can be sealingly matched with a second conical frustum surface arranged on the inner wall of the valve sleeve close to the first opening, the rear end of the head section is fixedly connected with the middle part of the front end of the tail section through the transition section, the outer wall of the tail section is matched with the inner wall of the valve sleeve, a spring mounting cavity is axially arranged at the rear end of the tail section, one end of the spring mounting cavity is in communication with the outer part of the rear end of the tail section, the other end of the spring mounting cavity is in communication with the outer part of the front end of the tail section through a connecting hole arranged in the inner part of the tail section, a cylindrical buffer block is axially arranged in the spring mounting cavity, the end face of one end of the cylindrical buffer block is fixedly connected with the inner wall of the spring mounting cavity, the other end of the cylindrical buffer block can be inserted into the first cylindrical hole, a spring is arranged outside the cylindrical buffer block, and the two ends of the spring are respectively abutted against the inner wall of the spring mounting cavity and the front end of the end cover.

[0007] An annular shoulder is fixedly arranged on the middle inner wall of the valve sleeve, a second cylindrical hole and a second conical hole are arranged on the inner wall of the annular shoulder, the small-diameter end of the second conical hole is connected with one end of the second cylindrical hole, an annular groove is arranged on the outer wall of the front end of the tail section, one end of the annular groove is located on the front end face of the tail section, and the part of the tail section, on which the annular groove is arranged, can be inserted into the second cylindrical hole.

[0008] A first pipeline and a second pipeline are axially arranged in the cylindrical buffer block, the two ends of the second pipeline are respectively in communication with the spring mounting cavity and the first pipeline, the diameter of the second pipeline is smaller than that of the first pipeline, the one-way valve further comprises a first micro one-way valve, the first micro one-way valve comprises a first steel ball and a first plug, the first steel ball is arranged in the inner part of one end of the first pipeline connected with the second pipeline, the first steel ball can move along the first pipeline, the first plug is arranged in the inner part of the other end of the first pipeline, and the other end of the first pipeline is in communication with the outer part of the rear end of the cylindrical buffer block.

[0009] A third pipeline and a fourth pipeline are radially arranged in the inner part of the front end of the tail section, the two ends of the third pipeline are respectively in communication with the spring mounting cavity and the fourth pipeline, the diameter of the third pipeline is smaller than that of the fourth pipeline, the one-way valve further comprises a second micro one-way valve, the second micro one-way valve comprises a second steel ball and a second plug, the second steel ball is arranged in the inner part of one end of the fourth pipeline connected with the third pipeline, the second steel ball can move along the fourth pipeline, the second plug is arranged in the inner part of the other end of the fourth pipeline, and the other end of the fourth pipeline is in communication with the annular groove.

[0010] A guide frame is arranged in the inner part of the first opening, and the valve core further comprises a guide column, the front end of the guide column is inserted into and matched with the guide hole arranged in the middle part of the guide frame, and the rear end of the guide column is fixedly connected with the middle part of the front end of the head section.

[0011] The front end of the end cover is axially provided with a first mounting hole and a second mounting hole, one end of the first mounting hole is in communication with the outside of the front end of the end cover, the other end of the first mounting hole is in communication with the large-diameter end of the first conical hole through the second mounting hole, the first mounting hole is in plug-fit with the rear end of the valve sleeve, and the second mounting hole is in plug-fit with the rear end of the tail section.

[0012] The front end of the valve sleeve is in sealing fit with the inner wall of the pipe fitting through a first sealing ring, and the rear end of the end cover is in sealing fit with the outer wall of the pipe fitting through a second sealing ring.

[0013] The inner diameter of the first cylindrical hole is equal to the outer diameter of the cylindrical buffer block.

[0014] The inner diameter of the annular groove is equal to the diameter of the small-diameter end of the second conical hole.

[0015] The diameter of the head section gradually decreases from the front end to the rear end, and the transition section is in cylindrical structure and has a diameter equal to that of the rear end of the head section.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1. The high-frequency one-way valve with bidirectional buffering is installed in the pipe, which comprises a valve sleeve, a valve core, a spring, an end cover, the valve sleeve is a hollow structure with two open ends, the front end of the valve sleeve is matched with the inner wall of the pipe, the rear end of the valve sleeve is matched with the front end of the end cover, the inside of the valve sleeve is communicated with the A cavity of the pipe through the first opening in the front end of the valve sleeve, and the inside of the valve sleeve is also communicated with the B cavity of the pipe through the second opening in the middle of the side wall of the valve sleeve, the middle of the end cover is axially provided with a first conical frustum hole and a first cylindrical hole, the small diameter end and the large diameter end of the first conical frustum hole are respectively communicated with the inside of the first cylindrical hole and the outside of the front end of the end cover, the rear end of the end cover is matched with the outer wall of the pipe, the valve core is axially arranged in the valve sleeve and comprises a head section, a transition section and a tail section, the first conical frustum surface is arranged on the outer wall of the front end of the head section, the first conical frustum surface can be sealingly matched with the second conical frustum surface arranged on the inner wall of the valve sleeve close to the first opening, the rear end of the head section is fixedly connected with the front end of the tail section through the transition section, the outer wall of the tail section is matched with the inner wall of the valve sleeve, the rear end of the tail section is axially provided with a spring mounting cavity, one end of the spring mounting cavity is communicated with the outside of the rear end of the tail section, the other end of the spring mounting cavity is communicated with the outside of the front end of the tail section through the connecting hole in the inside of the tail section, a columnar buffer block is axially arranged in the spring mounting cavity, one end surface of the columnar buffer block is fixedly connected with the inner wall of the spring mounting cavity, the other end of the columnar buffer block can be insertedly matched with the first cylindrical hole, the spring is sleeved outside the columnar buffer block, and the two ends of the spring are respectively abutted with the inner wall of the spring mounting cavity and the front end of the end cover; the working principle of the device is that when the pressure of the A cavity is high, the hydraulic pressure acts on the end surface of the head section of the valve core, the valve core moves backward by overcoming the spring force of the spring, the first conical frustum surface is separated from the second conical frustum surface, so that the A cavity is communicated with the B cavity, and the oil enters the B cavity from the A cavity; in order to avoid the impact between the tail section of the valve core and the end cover when the valve core moves to the fully open state, a buffering oil cavity composed of the first cylindrical hole and the first conical frustum hole is designed in the middle of the end cover, and a columnar buffer block which can be insertedly matched with the buffering oil cavity is designed in the inside of the spring mounting cavity, the columnar buffer block enters the first cylindrical hole through the first conical frustum hole, and the oil in the buffering oil cavity can only leak from the gap between the columnar buffer block and the first conical frustum hole, thereby forming the throttling buffering effect, so that the impact between the valve core and the end cover of the one-way valve is avoided, and the noise is reduced.

[0018] 2. In the high-frequency one-way valve with bidirectional buffering, an annular shoulder is fixed on the inner wall of the middle part of the valve sleeve, a second cylindrical hole and a second conical hole are arranged on the inner wall of the annular shoulder, the small-diameter end of the second conical hole is connected with one end of the second cylindrical hole, an annular groove is formed on the outer wall of the front end of the tail section, one end of the annular groove is located on the front end surface of the tail section, and the part of the tail section where the annular groove is arranged can be inserted into the second cylindrical hole. The working principle of the device is that when the pressure of the B cavity is high, the restoring force of the spring and the hydraulic pressure of the B cavity jointly act on the one-way valve spool, so that the spool moves to the front side until the first conical surface tightly abuts against the second conical surface, thereby limiting the movement of the spool and forming a seal, and the pressure of the B cavity cannot enter the A cavity. In order to avoid the head section of the spool from colliding with the valve sleeve when the spool moves forward to the full-closed state, an annular shoulder with a second cylindrical hole and a second conical hole is designed on the valve sleeve, and an annular groove is formed on the outer wall of the front end of the tail section. When the spool moves forward, an annular buffer oil cavity is formed between the annular groove and the second conical hole. The oil in the annular buffer oil cavity can only leak from the annular gap between the annular groove and the second conical hole, thereby forming throttling buffering, avoiding collision of the one-way valve spool when closing, further reducing noise, and avoiding sealing failure caused by high-frequency collision. Therefore, the present application can avoid collision between the spool and the valve sleeve when the one-way valve is closed, further reduce noise, and avoid sealing failure caused by high-frequency collision.

[0019] 3. In the high-frequency one-way valve with bidirectional buffering, a first pipeline and a second pipeline are arranged axially in the cylindrical buffer block, the two ends of the second pipeline are respectively communicated with the spring mounting cavity and the first pipeline, the diameter of the second pipeline is smaller than that of the first pipeline, and the one-way valve further comprises a first micro one-way valve. The first micro one-way valve comprises a first steel ball and a first plug. The first steel ball is installed in the inner part of one end of the first pipeline connected with the second pipeline and can move along the first pipeline. The first plug is installed in the inner part of the other end of the first pipeline, and the other end of the first pipeline is communicated with the outer part of the rear end of the cylindrical buffer block. The working principle of the design is that when the pressure of the B cavity is high and the spool works from the last end to the front end, the first steel ball abuts against the first plug to open the first micro one-way valve, and the oil in the spring mounting cavity enters the buffer oil cavity formed by the one-way valve spool and the end cover, thereby enabling the one-way valve spool to quickly move from the last end to the front end, while avoiding the formation of negative pressure in the buffer oil cavity to hinder the movement of the spool. When the pressure of the A cavity is high, the first steel ball contacts and seals the inclined surface between the first pipeline and the second pipeline to close the first micro one-way valve. Therefore, in the present application, the spool can quickly escape from the buffer area when the one-way valve is closed, and the working efficiency is high.

[0020] 4, In the high-frequency one-way valve with bidirectional buffering, the third pipeline and the fourth pipeline are arranged radially in the inside of the tail section front end, the two ends of the third pipeline are communicated with the spring mounting cavity and the fourth pipeline respectively, the diameter of the third pipeline is smaller than that of the fourth pipeline, the one-way valve further comprises a second micro one-way valve, the second micro one-way valve comprises a second steel ball and a second plug, the second steel ball is installed in the inside of one end of the fourth pipeline connected with the third pipeline, the second steel ball is movable along the fourth pipeline, the second plug is installed in the inside of the other end of the fourth pipeline, the other end of the fourth pipeline is communicated with the annular groove; when the pressure of the A cavity is high, the spool needs to move from the front end to the rear end under the hydraulic pressure of the A cavity, the second steel ball is attached to the second plug, so that the second micro one-way valve is opened, the buffer oil cavity enters the annular buffer cavity formed by the spool and the valve sleeve of the one-way valve, so that the spool can quickly move from the front end to the rear end, and meanwhile, the negative pressure formed in the annular buffer cavity is avoided to hinder the movement of the spool, when the pressure of the B cavity is high, the second steel ball is in contact with the inclined surface between the third pipeline and the fourth pipeline to seal, so that the second micro one-way valve is closed. Therefore, the spool in the application can quickly escape from the buffering area when the one-way valve is opened, and the working efficiency is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the assembly diagram of the application.

[0022] Figure 2 It is the working diagram of the application when the spool moves backward under high pressure of the A cavity.

[0023] Figure 3 It is the working diagram of the application when the spool moves forward under high pressure of the B cavity

[0024] Figure 4 It is the structure diagram of the valve sleeve in the application. Figure 1

[0025] It is the structure diagram of the valve sleeve in the application. Figure 5 Figure 1 It is the structure diagram of the spool in the application.

[0026] Figure 6 It is the structure diagram of the end cover in the application. Figure 1

[0027] ​​In the figure, the valve sleeve 1, the first opening 11, the second opening 12, the second conical surface 13, the annular shoulder 14, the first cylindrical hole 141, the second conical hole 142, the guide frame 15, the guide hole 151, the first sealing ring 16, the second sealing ring 17, the valve core 2, the head section 21, the first conical surface 211, the transition section 22, the tail section 23, the spring mounting cavity 231, the connecting hole 232, the annular groove 233, the cylindrical buffer block 24, the first pipeline 241, the second pipeline 242, the third pipeline 243, the fourth pipeline 244, the guide column 25, the spring 3, the end cover 4, the first conical hole 41, the first cylindrical hole 42, the first mounting hole 43, the second mounting hole 44, the first micro check valve 5, the first steel ball 51, the first plug 52, the second micro check valve 6, the second steel ball 61, the second plug 62, the pipe fitting 7, the A cavity 71, the B cavity 72. DETAILED DESCRIPTION

[0028] The application will be further described below in conjunction with the drawings and specific embodiments.

[0029] Reference Figures 1 to 6 A high-frequency check valve with bidirectional buffering, the check valve is installed inside the pipe fitting 7, comprising a valve sleeve 1, a valve core 2, a spring 3, and an end cover 4, the valve sleeve 1 is a hollow structure with two open ends, the front end outer wall of which is matched with the inner wall of the pipe fitting 7, and the rear end outer wall of which is matched with the front end of the end cover 4, the inside of which is communicated with the A cavity 71 of the pipe fitting 7 through the first opening 11 opened at the front end of the valve sleeve 1, and the inside of which is also communicated with the B cavity 72 of the pipe fitting 7 through the second opening 12 opened at the middle part of the side wall of the valve sleeve 1, the middle part of the end cover 4 is axially provided with a first conical hole 41 and a first cylindrical hole 42, the small-diameter end and the large-diameter end of the first conical hole 41 are respectively communicated with the inside of the first cylindrical hole 42 and the outside of the front end of the end cover 4, and the rear end of the end cover 4 is matched with the outer wall of the pipe fitting 7.

[0030] The valve core 2 is axially arranged inside the valve sleeve 1, including a head section 21, a transition section 22, and a tail section 23. A first conical frustum surface 211 is arranged on the front end outer wall of the head section 21, which can be sealingly matched with a second conical frustum surface 13 arranged on the inner wall of the valve sleeve 1 close to the first opening 11. The rear end of the head section 21 is fixedly connected with the front end middle part of the tail section 23 through the transition section 22. The outer wall of the tail section 23 is matched with the inner wall of the valve sleeve 1. A spring mounting cavity 231 is axially arranged at the rear end of the tail section 23. One end of the spring mounting cavity 231 is in communication with the outside of the rear end of the tail section 23, and the other end of the spring mounting cavity 231 is in communication with the outside of the front end of the tail section 23 through a connecting hole 232 arranged inside the tail section 23. A cylindrical buffer block 24 is axially arranged inside the spring mounting cavity 231. One end face of the cylindrical buffer block 24 is fixedly connected with the inner wall of the spring mounting cavity 231, and the other end of the cylindrical buffer block 24 is insertingly matched with the first cylindrical hole 42. A spring 3 is sleeved outside the cylindrical buffer block 24, and the two ends of the spring 3 are respectively abutted with the inner wall of the spring mounting cavity 231 and the front end of the end cover 4.

[0031] An annular shoulder 14 is fixedly arranged on the middle part inner wall of the valve sleeve 1. A second cylindrical hole 141 and a second conical frustum hole 142 are arranged on the inner wall of the annular shoulder 14. The small-diameter end of the second conical frustum hole 142 is connected with one end of the second cylindrical hole 141. An annular groove 233 is arranged on the front end outer wall of the tail section 23. One end of the annular groove 233 is located on the front end end face of the tail section 23. The part of the tail section 23, on which the annular groove 233 is arranged, is insertingly matched with the second cylindrical hole 141.

[0032] A first pipeline 241 and a second pipeline 242 are axially arranged inside the cylindrical buffer block 24. The two ends of the second pipeline 242 are respectively in communication with the spring mounting cavity 231 and the first pipeline 241. The diameter of the second pipeline 242 is smaller than that of the first pipeline 241. The one-way valve further comprises a first micro one-way valve 5. The first micro one-way valve 5 comprises a first steel ball 51 and a first plug 52. The first steel ball 51 is arranged inside one end of the first pipeline 241, which is connected with the second pipeline 242. The first steel ball 51 is movable along the first pipeline 241. The first plug 52 is arranged inside the other end of the first pipeline 241. The other end of the first pipeline 241 is in communication with the outside of the rear end of the cylindrical buffer block 24.

[0033] The third pipeline 243 and the fourth pipeline 244 are arranged radially inside the front end of the tail section 23, the two ends of the third pipeline 243 are communicated with the spring mounting cavity 231 and the fourth pipeline 244 respectively, the diameter of the third pipeline 243 is smaller than that of the fourth pipeline 244, the one-way valve further comprises a second micro one-way valve 6, the second micro one-way valve 6 comprises a second steel ball 61 and a second plug 62, the second steel ball 61 is arranged inside one end of the fourth pipeline 244 which is connected with the third pipeline 243, the second steel ball 61 is movable along the fourth pipeline 244, the second plug 62 is arranged inside the other end of the fourth pipeline 244, the other end of the fourth pipeline 244 is communicated with the annular groove 233.

[0034] The guiding frame 15 is arranged inside the first opening 11, the valve core 2 further comprises a guiding column 25, the front end of the guiding column 25 is inserted and matched with the guiding hole 151 arranged in the middle of the guiding frame 15, the rear end of the guiding column 25 is fixedly connected with the middle of the front end of the head section 21.

[0035] The first mounting hole 43 and the second mounting hole 44 are axially arranged in the front end of the end cover 4, one end of the first mounting hole 43 is communicated with the outside of the front end of the end cover 4, the other end of the first mounting hole 43 is communicated with the large diameter end of the first conical frustum hole 41 through the second mounting hole 44, the first mounting hole 43 is inserted and matched with the rear end of the valve sleeve 1, the second mounting hole 44 is inserted and matched with the rear end of the tail section 23.

[0036] The front end outer wall of the valve sleeve 1 is sealingly matched with the inner wall of the pipe 7 through the first sealing ring 16, the rear end of the end cover 4 is sealingly matched with the outer wall of the pipe 7 through the second sealing ring 17.

[0037] The inner diameter of the first cylindrical hole 42 is equal to the outer diameter of the columnar buffer block 24.

[0038] The inner diameter of the annular groove 233 is equal to the diameter of the small diameter end of the second conical frustum hole 142.

[0039] The diameter of the head section 21 gradually decreases from the front end to the rear end, the transition section 22 is in a cylindrical structure, and the diameter of the transition section 22 is equal to the diameter of the rear end of the head section 21.

[0040] The principle of the application is as follows:

[0041] The high-frequency one-way valve with bidirectional buffering of the application avoids the impact between the sealing surface of the one-way valve core and the end cover through the end throttling buffering formed at both ends of the movement, and avoids the problem that the one-way valve core cannot quickly separate from the buffering area through the arrangement of the first micro one-way valve 5 and the second micro one-way valve 6, so that the one-way valve core can avoid impact and quickly open and close during the working process, and the noise and service life problems of the one-way valve are solved.

[0042] Embodiment 1:

[0043] Referring to Figures 1 to 6 A high-frequency one-way valve with bidirectional buffering, the one-way valve is installed inside a pipe 7, comprising a valve sleeve 1, a valve core 2, a spring 3, and an end cover 4, the valve sleeve 1 is a hollow structure with two open ends, the outer wall of the front end of the valve sleeve 1 is in sealing cooperation with the inner wall of the pipe 7 through a first sealing ring 16, the outer wall of the rear end cooperates with the front end of the end cover 4, the inside of the valve sleeve 1 is in communication with the A cavity 71 of the pipe 7 through a first opening 11 at the front end of the valve sleeve 1, and the inside of the valve sleeve 1 is also in communication with the B cavity 72 of the pipe 7 through a second opening 12 at the middle of the side wall of the valve sleeve 1, the middle of the end cover 4 is axially provided with a first conical frustum hole 41 and a first cylindrical hole 42, the small-diameter end and the large-diameter end of the first conical frustum hole 41 are respectively in communication with the inside of the first cylindrical hole 42 and the outside of the front end of the end cover 4, the rear end of the end cover 4 is in sealing cooperation with the outer wall of the pipe 7 through a second sealing ring 17, the valve core 2 is axially arranged inside the valve sleeve 1 and comprises a head section 21, a transition section 22, and a tail section 23, the diameter of the head section 21 gradually decreases from the front end to the rear end, a first conical frustum surface 211 is arranged on the outer wall of the front end of the head section 21, the first conical frustum surface 211 can be in sealing cooperation with a second conical frustum surface 13 arranged on the inner wall of the valve sleeve 1 close to the first opening 11, the rear end of the head section 21 is fixedly connected with the front end of the tail section 23 through the transition section 22, the transition section 22 is a cylindrical structure with a diameter equal to that of the rear end of the head section 21, the outer wall of the tail section 23 cooperates with the inner wall of the valve sleeve 1, the rear end of the tail section 23 is axially provided with a spring mounting cavity 231, one end of the spring mounting cavity 231 is in communication with the outside of the rear end of the tail section 23, the other end of the spring mounting cavity 231 is in communication with the outside of the front end of the tail section 23 through a connecting hole 232 arranged inside the tail section 23, a columnar buffer block 24 is axially arranged inside the spring mounting cavity 231, one end surface of the columnar buffer block 24 is fixedly connected with the inner wall of the spring mounting cavity 231, the other end of the columnar buffer block 24 can be inserted into the first cylindrical hole 42, the spring 3 is sleeved outside the columnar buffer block 24, the two ends of the spring 3 respectively abut against the inner wall of the spring mounting cavity 231 and the front end of the end cover 4, a ring-shaped shoulder 14 is fixedly arranged on the middle inner wall of the valve sleeve 1, a second cylindrical hole 141 and a second conical frustum hole 142 are arranged on the inner wall of the ring-shaped shoulder 14, the small-diameter end of the second conical frustum hole 142 is connected with one end of the second cylindrical hole 141, a ring-shaped groove 233 is arranged on the outer wall of the front end of the tail section 23, one end of the ring-shaped groove 233 is located on the front end surface of the tail section 23, the part of the tail section 23 on which the ring-shaped groove 233 is arranged can be inserted into the second cylindrical hole 141.

[0044] Embodiment 2:

[0045] The difference from example 1 is that:

[0046] The cylindrical buffer block 24 is internally provided with a first pipeline 241 and a second pipeline 242, the two ends of the second pipeline 242 are respectively communicated with the spring mounting cavity 231 and the first pipeline 241, the diameter of the second pipeline 242 is smaller than that of the first pipeline 241, the one-way valve further comprises a first micro one-way valve 5, the first micro one-way valve 5 comprises a first steel ball 51 and a first plug 52, the first steel ball 51 is internally installed on one end of the first pipeline 241 connected with the second pipeline 242, the first steel ball 51 is movable along the first pipeline 241, the first plug 52 is internally installed on the other end of the first pipeline 241, the other end of the first pipeline 241 is communicated with the outside of the rear end of the cylindrical buffer block 24;

[0047] The inside of the front end of the tail section 23 is radially provided with a third pipeline 243 and a fourth pipeline 244, the two ends of the third pipeline 243 are respectively communicated with the spring mounting cavity 231 and the fourth pipeline 244, the diameter of the third pipeline 243 is smaller than that of the fourth pipeline 244, the one-way valve further comprises a second micro one-way valve 6, the second micro one-way valve 6 comprises a second steel ball 61 and a second plug 62, the second steel ball 61 is internally installed on one end of the fourth pipeline 244 connected with the third pipeline 243, the second steel ball 61 is movable along the fourth pipeline 244, the second plug 62 is internally installed on the other end of the fourth pipeline 244, the other end of the fourth pipeline 244 is communicated with the annular groove 233.

[0048] Example 3:

[0049] The difference from example 1 is that:

[0050] The inside of the first opening 11 is provided with a guide frame 15, the valve core 2 further comprises a guide column 25, the front end of the guide column 25 is inserted and matched in the guide hole 151 in the middle of the guide frame 15, the rear end of the guide column 25 is fixedly connected with the front end of the head section 21.

[0051] Example 4:

[0052] The difference from example 1 is that:

[0053] The front end of the end cover 4 is axially provided with a first mounting hole 43 and a second mounting hole 44, one end of the first mounting hole 43 is communicated with the outside of the front end of the end cover 4, the other end of the first mounting hole 43 is communicated with the large diameter end of the first conical hole 41 through the second mounting hole 44, the first mounting hole 43 is inserted and matched with the rear end of the valve sleeve 1, the second mounting hole 44 is inserted and matched with the rear end of the tail section 23.

[0054] Example 5:

[0055] The difference from Example 1 is that:

[0056] The inner diameter of the first cylindrical hole 42 is equal to the outer diameter of the cylindrical buffer block 24, and the inner diameter of the annular groove 233 is equal to the diameter of the small diameter end of the second frustoconical hole 142.

Claims

1. A high-frequency one-way valve with bidirectional buffering, characterized in that: the one-way valve is installed inside a pipe fitting (7) and comprises a valve sleeve (1), a valve core (2), a spring (3) and an end cover (4); the valve sleeve (1) is a hollow structure with two open ends, the front end of the valve sleeve (1) is matched with the inner wall of the pipe fitting (7), the rear end of the valve sleeve (1) is matched with the front end of the end cover (4), the inside of the valve sleeve (1) is communicated with a cavity A (71) of the pipe fitting (7) through a first opening (11) formed at the front end of the valve sleeve (1), and the inside of the valve sleeve (1) is also communicated with a cavity B (72) of the pipe fitting (7) through a second opening (12) formed at the middle of the side wall of the valve sleeve (1); the middle of the end cover (4) is axially provided with a first conical frustum hole (41) and a first cylindrical hole (42), the small-diameter end and the large-diameter end of the first conical frustum hole (41) are respectively communicated with the inside of the first cylindrical hole (42) and the outside of the front end of the end cover (4), and the rear end of the end cover (4) is matched with the outer wall of the pipe fitting (7); the valve core (2) is axially arranged inside the valve sleeve (1) and comprises a head section (21), a transition section (22) and a tail section (23); the front end of the head section (21) is provided with a first conical frustum surface (211), the first conical frustum surface (211) is sealingly matched with a second conical frustum surface (13) formed on the inner wall of the valve sleeve (1) close to the first opening (11), the rear end of the head section (21) is fixedly connected with the front end of the middle of the transition section (22) and the tail section (23), the outer wall of the tail section (23) is matched with the inner wall of the valve sleeve (1), the rear end of the tail section (23) is axially provided with a spring mounting cavity (231), one end of the spring mounting cavity (231) is communicated with the outside of the rear end of the tail section (23), the other end of the spring mounting cavity (231) is communicated with the outside of the front end of the tail section (23) through a connecting hole (232) formed in the inside of the tail section (23), a columnar buffer block (24) is axially arranged in the inside of the spring mounting cavity (231), one end face of the columnar buffer block (24) is fixedly connected with the inner wall of the spring mounting cavity (231), the other end of the columnar buffer block (24) is insertedly matched with the first cylindrical hole (42), the spring (3) is sleeved outside the columnar buffer block (24), and the two ends of the spring (3) are respectively abutted with the inner wall of the spring mounting cavity (231) and the front end of the end cover (4); the middle inner wall of the valve sleeve (1) is fixedly provided with an annular shoulder (14), the inner wall of the annular shoulder (14) is provided with a second cylindrical hole (141) and a second conical frustum hole (142), the small-diameter end of the second conical frustum hole (142) is connected with one end of the second cylindrical hole (141), the front end outer wall of the tail section (23) is provided with an annular groove (233), one end of the annular groove (233) is located on the front end face of the tail section (23), and the part of the tail section (23) provided with the annular groove (233) on the front end is insertedly matched with the second cylindrical hole (141); when the valve core (2) moves forward, an annular buffering oil cavity is formed between the annular groove (233) and the second conical frustum hole (142). ​ 2. The high-frequency check valve with bidirectional buffering according to claim 1, characterized in that: an inner part of the cylindrical buffering block (24) is provided with a first pipeline (241) and a second pipeline (242) in an axial direction, two ends of the second pipeline (242) are communicated with the spring mounting cavity (231) and the first pipeline (241) respectively, a diameter of the second pipeline (242) is smaller than that of the first pipeline (241), the high-frequency check valve further comprises a first micro check valve (5), the first micro check valve (5) comprises a first steel ball (51) and a first plug (52), the first steel ball (51) is installed in an inner part of one end of the first pipeline (241) connected with the second pipeline (242), the first steel ball (51) moves along the first pipeline (241), the first plug (52) is installed in an inner part of the other end of the first pipeline (241), the other end of the first pipeline (241) is communicated with an outer part of the rear end of the cylindrical buffering block (24).

3. The high-frequency check valve with bidirectional buffering according to claim 1, characterized in that: an inner part of the front end of the tail section (23) is provided with a third pipeline (243) and a fourth pipeline (244) in a radial direction, two ends of the third pipeline (243) are communicated with the spring mounting cavity (231) and the fourth pipeline (244) respectively, a diameter of the third pipeline (243) is smaller than that of the fourth pipeline (244), the high-frequency check valve further comprises a second micro check valve (6), the second micro check valve (6) comprises a second steel ball (61) and a second plug (62), the second steel ball (61) is installed in an inner part of one end of the fourth pipeline (244) connected with the third pipeline (243), the second steel ball (61) moves along the fourth pipeline (244), the second plug (62) is installed in an inner part of the other end of the fourth pipeline (244), the other end of the fourth pipeline (244) is communicated with the annular groove (233).

4. The high-frequency check valve with bidirectional buffering according to claim 1, characterized in that: an inner part of the first opening (11) is installed with a guide frame (15), the valve core (2) further comprises a guide column (25), a front end of the guide column (25) is inserted and matched with a guide hole (151) opened in a middle part of the guide frame (15), a rear end of the guide column (25) is fixedly connected with a front end middle part of the head section (21).

5. The high-frequency check valve with bidirectional buffering according to claim 1, characterized in that: a front end of the end cover (4) is axially provided with a first mounting hole (43) and a second mounting hole (44), one end of the first mounting hole (43) is communicated with an outer part of the front end of the end cover (4), the other end of the first mounting hole (43) is communicated with a large diameter end of the first conical frustum hole (41) through the second mounting hole (44), the first mounting hole (43) is inserted and matched with the rear end of the valve sleeve (1), the second mounting hole (44) is inserted and matched with the rear end of the tail section (23).

6. The high-frequency check valve with bidirectional buffering according to claim 1, characterized in that: The front end outer wall of the valve sleeve (1) is sealed with the inner wall of the pipe fitting (7) by a first sealing ring (16), and the rear end of the end cover (4) is sealed with the outer wall of the pipe fitting (7) by a second sealing ring (17).

7. The high-frequency one-way valve with bidirectional buffering according to claim 1, characterized in that: The inner diameter of the first cylindrical hole (42) is equal to the outer diameter of the cylindrical buffering block (24).

8. The high-frequency one-way valve with bidirectional buffering according to claim 1, characterized in that: The inner diameter of the annular groove (233) is equal to the diameter of the small-diameter end of the second conical frustum hole (142).

9. The high-frequency one-way valve with bidirectional buffering according to claim 1, characterized in that: The diameter of the head section (21) gradually decreases from the front end to the rear end, and the transition section (22) is in a cylindrical structure with a diameter equal to that of the rear end of the head section (21).

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