A hydraulic needle valve

Abstract

The present application relates to the technical field of valves, and discloses a hydraulic needle valve, which comprises a valve body, a feed pipe and a discharge pipe are provided on the valve body, a cavity is provided in the valve body, a feed hole is provided on the feed pipe, a discharge hole is provided on the discharge pipe, and a blocking structure is provided in the valve body; a mounting ring groove is provided on the inner wall of the discharge hole, the blocking structure comprises a valve seat arranged in the mounting ring groove, and a locking structure connecting the valve seat and the discharge pipe is provided between the valve seat and the discharge pipe; a through hole is provided on the discharge pipe, and the locking structure comprises an operating ring rotatably connected to the outside of the discharge pipe and a locking rod penetrated in the through hole, an operating groove is provided on the operating ring, an operating block is provided in the operating groove, the operating groove comprises a first operating surface and a second operating surface along the circumferential direction of the operating ring, the bottom wall of the operating groove comprises adjacent guide surfaces and locking planes, the spacing between the guide surface and the axis of the operating ring gradually decreases along the end surface close to the second operating surface, and a locking groove is provided on the valve seat. The present application has the effect of reducing the maintenance cost of the valve.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a hydraulic needle valve. Background Art

[0002] Hydraulic needle valves are widely used in hydropower, irrigation and drainage, water plants, water conservancy and other industries. Hydraulic needle valves are often used as bypass inspection valves for the main control valves of new pumped storage power stations, and are an indispensable special valve for new pumped storage power stations.

[0003] A hydraulic needle valve in the related art includes a valve body, a cavity is formed in the valve body, a feed hole connected to the cavity is formed at one end of the valve body, and a discharge hole connected to the cavity is formed at the other end of the valve body. A valve disc is provided in the valve body, and a hydraulic cylinder for driving the valve disc to move is provided on the valve body. When the valve disc hits the boundary edge between the cavity and the discharge hole, the valve disc closes the discharge hole.

[0004] When the hydraulic needle valve is opened and closed many times, the collision between the valve disc and the valve body will cause damage to the boundary edge between the cavity and the discharge hole, causing damage to the hydraulic needle valve. Since the valve body is cast in one piece, replacement requires replacement of the entire body, which has a high maintenance cost. Summary of the invention

[0005] In order to improve the maintenance cost of a hydraulic needle valve, the present application provides a hydraulic needle valve.

[0006] A hydraulic needle valve comprises a valve body, a feed pipe is arranged on the side of the valve body, a discharge pipe is arranged below the valve body, a cavity is formed in the valve body, a feed hole connected to the cavity is formed on the side of the feed pipe away from the valve body, a discharge hole connected to the cavity is formed on the side of the discharge pipe away from the valve body, and a blocking structure for blocking the discharge hole is arranged in the valve body; a mounting ring groove is formed on the inner wall of the discharge hole, one end of the mounting ring groove is connected to the cavity, the blocking structure comprises a valve seat arranged in the mounting ring groove, the valve seat is annular, and a locking structure connecting the valve seat and the discharge pipe is provided between the two; a A through hole connected to the mounting ring groove, the locking structure includes an operating ring rotatably connected to the outside of the discharge pipe and a locking rod penetrated in the through hole, the inner circumferential surface of the operating ring is provided with an operating groove that can be aligned with the through hole, an operating block that can be inserted into the through hole is arranged in the operating groove, the operating groove includes a first operating surface and a second operating surface along the circumferential direction of the operating ring, the bottom wall of the operating groove includes adjacent guide surfaces and locking planes, the spacing between the guide surface and the axis of the operating ring gradually decreases along the end surface close to the second operating surface, the locking plane is located on the side of the guide surface close to the second operating surface, and a locking groove for inserting the locking rod is provided on the outer circumferential surface of the valve seat.

[0007] By adopting the above technical solution, when the valve seat is installed in the installation ring groove and the locking groove is aligned with the perforation, the operating ring is driven to rotate, and the guide surface drives the operating block to continuously insert into the perforation and abut against the locking rod. The operating block pushes the locking rod to move, so that the locking rod is inserted into the locking groove. When the operating block contacts the locking plane, the valve body and the valve seat are connected and locked; conversely, the lock between the valve body and the valve seat is released, which makes it convenient for the staff to separate the valve seat from the valve body and replace the valve seat, thereby realizing partial replacement of the valve without replacing the entire valve body, thereby reducing the maintenance cost of the hydraulic needle valve.

[0008] Optionally, an unlocking spring and an unlocking block are provided in the locking groove, one end of the unlocking spring is connected to the bottom wall of the locking groove, and the other end of the unlocking spring is connected to the unlocking block; when the locking rod is inserted into the locking groove and contacts the unlocking block, the unlocking spring is in a compressed state.

[0009] By adopting the above technical solution, when the locking structure releases the lock between the valve body and the valve seat, the unlocking spring resets and drives the unlocking block to move, and the unlocking block drives the locking rod to disengage from the locking groove, thereby facilitating the subsequent separation of the valve seat and the valve body.

[0010] Optionally, a limiting groove is provided on the inner wall of the locking groove close to the cavity, the limiting groove penetrates the valve seat in a direction away from the bottom wall of the locking groove, and the unlocking block is provided with a limiting block inserted into the limiting groove.

[0011] By adopting the above technical solution, when the limit block abuts against the inner wall of the installation ring groove, the limit block is restricted from continuing to move, that is, the unlocking block is restricted from moving, so that the unlocking block is not easy to enter the through hole, making it convenient for the staff to separate the valve seat from the valve body.

[0012] Optionally, a positioning block is provided on a side of the unlocking block away from the unlocking spring, an end surface of the positioning block away from the unlocking block is an arc-shaped surface, and the through hole can be inserted into the positioning block.

[0013] By adopting the above technical solution, when the valve seat is installed in the mounting ring groove, the positioning block contacts the valve body. As the valve seat moves away from the mounting hole, the positioning block is completely embedded in the locking groove. At the same time, the unlocking spring is compressed and deformed, and then drives the valve seat to rotate. When the locking groove is aligned with the perforation, the unlocking spring drives the positioning block to be inserted into the perforation, thereby preliminarily positioning the valve seat and the valve body.

[0014] Optionally, a resilient positioning block is provided on the valve seat, an end surface of the positioning block away from the valve seat axis is an arc-shaped surface, and a positioning groove for inserting the positioning block is provided on the inner circumferential surface of the mounting ring groove.

[0015] By adopting the above technical solution, during the process of installing the valve seat into the mounting ring groove, the positioning block contacts the valve body, and as the valve seat moves in the direction away from the mounting hole, the positioning block deforms and enters the mounting ring groove, and then drives the valve seat to rotate. When the positioning groove is aligned with the positioning block, the positioning block is reset and inserted into the positioning groove, thereby preliminarily positioning the valve seat and the valve body.

[0016] Optionally, a storage groove is provided at one end of the operating block away from the axis of the operating ring, and an insert block and an operating spring are arranged in the storage groove. The operating spring is in a compressed state, one end of the operating spring abuts against the bottom wall of the storage groove, and the other end of the operating spring abuts against the insert block, and a slot for inserting the insert block is provided on the locking plane.

[0017] By adopting the above technical solution, when the operating block is inserted into the through hole, the operating block abuts against the locking plane and the storage groove is aligned with the slot, the operating spring resets and drives the insertion block to move, so that the insertion block is inserted into the slot, making it difficult for the operating block to move along the circumferential direction of the operating ring in the operating slot, thereby playing a role of limit locking.

[0018] Optionally, an operating member for driving the plug block to disengage from the slot is provided on the operating ring, a socket is provided on the bottom wall of the slot, the operating member includes a push block arranged in the slot, a push rod passing through the socket is provided on the side of the push block facing the bottom wall of the slot, and a limit plate is provided on the end of the push rod away from the push block.

[0019] By adopting the above technical solution, the push rod is pushed, so that the push block pushes the insert block to make the insert block disengage from the slot. At this time, the operating ring is driven to rotate, so that the operating block can move in the operating groove along the circumferential direction of the operating ring.

[0020] Optionally, the end surface of the locking rod away from the discharge hole is provided with a positioning rod that can be inserted into the operating groove, and the end surface of the operating block facing the axis of the operating ring is provided with a groove for the positioning rod to be inserted, and the groove passes through the operating block on the side facing the first operating surface.

[0021] By adopting the above technical solution, when the operating ring rotates to unlock, when the first operating surface abuts against the positioning rod, the operating ring is restricted from further rotation, thereby playing a limiting role.

[0022] Optionally, a mounting hole is provided on the inner wall of the cavity away from the discharge hole, and the sealing structure also includes a valve flap arranged in the cavity, and the valve flap can seal the discharge hole. A valve stem is provided on the side of the valve flap away from the discharge hole, and the valve stem passes through the mounting hole and extends out of the valve body. A driving member is provided on the valve body, which can drive the valve flap to move along the axis of the mounting hole.

[0023] By adopting the above technical solution, the driving member drives the valve disc to move toward the discharge hole, so that the valve disc blocks the discharge hole and closes the hydraulic needle valve; conversely, the driving member drives the valve disc to move away from the discharge hole and opens the hydraulic needle valve.

[0024] Optionally, the valve stem outer sleeve is provided with a folding tube located in the cavity, one end of the folding tube is connected to the valve flap, and the other end of the folding tube is connected to the inner wall of the cavity.

[0025] By adopting the above technical solution, the folding tube sleeve is arranged outside the valve stem, so that the valve stem does not contact with the external fluid, thereby protecting the valve stem; when impurities and scale are formed on the folding tube, the folding tube is folded and unfolded as the valve stem and the valve disc rise and fall, so that the impurities on the folding tube are loosened, and when the fluid passes through the folding tube, the impurities can be flushed and filtered from the folding tube, thereby protecting the folding tube and improving the service life of the folding tube.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When the valve seat is installed in the installation ring groove and the locking groove is aligned with the perforation, the operating ring is driven to rotate, and the guide surface drives the operating block to continuously insert into the perforation and abut against the locking rod. The operating block pushes the locking rod to move, so that the locking rod is inserted into the locking groove. When the operating block contacts the locking plane, the valve body and the valve seat are connected and locked; on the contrary, the lock between the valve body and the valve seat is released, which is convenient for the staff to separate the valve seat from the valve body and replace the valve seat, so as to realize partial replacement of the valve without replacing the entire valve body, thereby reducing the maintenance cost of the hydraulic needle valve;

[0028] 2. The push rod can drive the plug block to move, so that the plug block is out of the slot, thereby unlocking the operating block and the operating ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0031] Figure 2 is along Figure 1 Sectional view along line AA;

[0032] Figure 3 is a side view of an embodiment;

[0033] Figure 4 is along Figure 3Partial cross-sectional view of the middle BB line;

[0034] Figure 5 is an exploded view highlighting the locking structure;

[0035] Figure 6 yes Figure 4 A magnified schematic diagram of part C;

[0036] Figure 7 is along Figure 3 Partial cross-sectional view along line DD.

[0037] Figure numerals: 1, valve body; 11, cavity; 12, mounting hole; 2, feed pipe; 21, feed hole; 3, discharge pipe; 31, discharge hole; 32, mounting ring groove; 33, perforation; 4, blocking structure; 41, valve seat; 411, locking groove; 412, limiting groove; 413, unlocking block; 414, unlocking spring; 415, positioning block; 416, limiting block; 42, valve disc; 43, valve stem; 44, driving member; 441, mounting plate; 442 , support rod; 443, support plate; 444, hydraulic device; 5, locking structure; 51, operating ring; 511, operating groove; 512, guide surface; 513, locking plane; 514, slot; 515, socket; 516, push rod; 517, push block; 518, limit plate; 52, locking rod; 521, positioning rod; 53, operating block; 531, storage slot; 532, operating spring; 533, plug block; 534, groove; 6, folding tube. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-7 This application is described in further detail.

[0039] This embodiment discloses a hydraulic needle valve. Figure 1 and Figure 2 A hydraulic needle valve comprises a valve body 1, in which a cavity 11 is formed. A feed pipe 2 is fixedly connected to the side of a valve stem 43, and a feed hole 21 is formed at one end of the feed pipe 2 away from the valve body 1, and the feed hole 21 is connected to the cavity 11. A discharge pipe 3 is fixedly connected to the bottom of the valve body 1, and a discharge hole 31 is formed at one end of the discharge pipe 3 away from the valve body 1, and the discharge hole 31 is connected to the cavity 11. A mounting hole 12 is formed on one side of the valve body 1 away from the discharge pipe 3, and the mounting hole 12 is connected to the cavity 11, and the mounting hole 12 and the discharge hole 31 are coaxially arranged.

[0040] Reference Figure 2 and Figure 3 A plugging structure 4 is provided in the valve body 1, and the plugging structure 4 is used to open and close the discharge hole 31. The plugging structure 4 includes a valve seat 41, a valve flap 42, a valve stem 43 and a driving member 44.

[0041] Reference Figure 2 and Figure 4 The inner wall of the discharge hole 31 is provided with a mounting annular groove 32, which penetrates the discharge pipe 3 toward the valve seat 41, so that the mounting annular groove 32 is connected with the cavity 11. The valve seat 41 is annular. The valve seat 41 is arranged in the mounting annular groove 32. Two locking structures 5 are arranged between the valve seat 41 and the valve body 1, and the two locking structures 5 are distributed along the circumference of the discharge pipe 3. In other embodiments, the locking structures 5 can also be three, four or other numbers.

[0042] Reference Figure 4 and Figure 6 The locking structure 5 includes an operating ring 51, a locking rod 52 and an operating block 53. Two through holes 33 are formed on the outer circumferential surface of the discharge pipe 3, and the two through holes 33 are distributed around the circumference of the discharge pipe 3. The through holes 33 are connected to the mounting ring groove 32.

[0043] Reference Figure 5 and Figure 6 , the operating ring 51 is rotatably connected to the outside of the discharge pipe 3. An operating groove 511 is provided on the inner circumferential surface of the operating ring 51, and the operating groove 511 includes a first operating surface and a second operating surface along the circumference of the operating ring 51. The bottom wall of the operating groove 511 includes a guide surface 512 and a locking plane 513. The guide surface 512 is located on the side of the locking plane 513 away from the second operating surface. The distance between the guide surface 512 and the operating ring 51 gradually decreases as it approaches the locking plane 513.

[0044] Reference Figure 5 and Figure 6 The operating block 53 is disposed in the operating groove 511 , and the operating block 53 can be inserted into the through hole 33 . As the operating ring 51 rotates, the operating block 53 can move along the axial direction of the through hole 33 .

[0045] Reference Figure 5 and Figure 6 The end surface of the operating block 53 away from the axis of the operating ring 51 is provided with a storage groove 531, and an operating spring 532 and an insert block 533 are arranged in the storage groove 531. The operating spring 532 is in a compressed state. One end of the operating spring 532 abuts against the insert block 533, and the other end of the operating spring 532 abuts against the bottom wall of the storage groove 531.

[0046] Reference Figure 5 and Figure 6 The locking plane 513 is provided with a slot 514, and the slot 514 can be inserted into the insert block 533. When the insert block 533 is inserted into the slot 514, the operating ring 51 rotates around the axis of the discharge pipe 3, playing a role of limiting locking.

[0047] Reference Figure 5 and Figure 6, an operating member is provided on the operating ring 51, and the operating member is used to drive the plug block 533 to disengage from the slot 514. The operating member includes a push rod 516, a limit plate 518 and a push block 517. A plug hole 515 is provided on the bottom wall of the slot 514. The push rod 516 is inserted into the plug hole 515, and one end of the push rod 516 is fixedly connected to the limit plate 518, and the limit plate 518 is located outside the operating ring 51. The other end of the push rod 516 is fixedly connected to the push block 517, and the push block 517 is located in the slot 514. When the limit plate 518 abuts against the outer circumferential surface of the operating ring 51, the end surface of the push block 517 away from the push rod 516 is coplanar with the locking plane 513. At this time, the operating ring 51 is rotated to make the operating block 53 no longer contact the locking plane 513.

[0048] Reference Figure 5 and Figure 7 A groove 534 is formed on the end surface of the operating block 53 facing the axis of the operating ring 51 , and the groove 534 penetrates the operating block 53 in the direction of the first operating surface.

[0049] Reference Figure 5 and Figure 7 The locking rod 52 is inserted into the through hole 33, and the end surface of the locking rod 52 facing the operating block 53 is fixedly connected with a positioning rod 521. The positioning rod 521 can be inserted into the operating groove 511, and the positioning rod 521 is inserted into the groove 534. When the positioning rod 521 is inserted into the operating groove 511 and the first operating surface abuts against the positioning rod 521, the operating ring 51 is restricted from rotating in the unlocking direction, which plays a limiting role.

[0050] Reference Figure 2 , Figure 5 and Figure 6 The outer circumferential surface of the valve seat 41 is provided with a locking groove 411, and the locking groove 411 can be inserted into the locking rod 52. The locking groove 411 is provided with a limiting groove 412 near the inner wall of the cavity 11, and the limiting groove 412 penetrates the valve seat 41 in a direction away from the bottom wall of the locking groove 411.

[0051] Reference Figure 5 and Figure 6 An unlocking block 413 and an unlocking spring 414 are provided in the locking groove 411. The unlocking spring 414 is in a compressed state, one end of the unlocking spring 414 is connected to the bottom wall of the locking groove 411, and the other end of the unlocking spring 414 is connected to the unlocking block 413. A positioning block 415 is fixedly connected to the end face of the unlocking block 413 away from the unlocking spring 414, and the end face of the positioning block 415 away from the unlocking block 413 is an arc surface, and the positioning block 415 can be inserted into the through hole 33.

[0052] Reference Figure 2 , Figure 5 and Figure 6When the valve seat 41 is installed in the mounting ring groove 32, the valve seat 41 is driven to rotate. When the locking groove 411 is aligned with the through hole 33, the unlocking spring 414 can drive the positioning block 415 to be inserted into the through hole 33, and the valve seat 41 is initially locked with the valve body 1. At this time, the valve seat 41 and the valve body 1 are in a preliminary locking state. When the valve seat 41 is separated from the valve body 1, the valve seat 41 is driven to move toward the cavity 11. The arc surface of the positioning block 415 makes it easy for the positioning block 415 to be separated from the through hole 33.

[0053] In other embodiments, the positioning block 415 can be arranged on the outer circumferential surface of the valve seat 41, the end surface of the positioning block 415 away from the valve body 1 is an arc surface, the positioning block 415 is elastic, and the inner circumferential surface of the mounting ring groove 32 is provided with a positioning groove, and the positioning groove can be inserted into the positioning block 415. When the positioning block 415 is inserted into the positioning groove, the locking groove 411 is aligned with the through hole 33.

[0054] Reference Figure 2 , Figure 5 and Figure 6 The unlocking block 413 is fixedly connected to the end surface of the cavity 11 with the limiting block 416, and the limiting block 416 is slidably disposed in the limiting groove 412. When the limiting block 416 abuts against the inner wall circumference of the mounting ring groove 32, the locking rod 52 is disengaged from the locking groove 411, the positioning rod 521 is inserted into the operating groove 511, and the operating block 53 abuts against the guide surface 512.

[0055] Reference Figure 6 and Figure 7 , the edge of the locking rod 52 away from the operating block 53 is chamfered. In other embodiments, a protrusion is fixedly connected to the side of the locking rod 52 away from the operating block 53, and the protrusion is conical. The end of the protrusion away from the locking rod 52 is spherical. An embedding groove is provided on the positioning block 415, and the embedding groove can be used for part of the protrusion to be inserted. When the valve seat 41 and the valve body 1 are in a preliminary locking state, part of the protrusion is in the embedding groove. When the operating ring 51 rotates to drive the operating block 53 to move, the operating block 53 drives the locking rod 52, and the locking rod 52 drives the positioning block 415 back to the locking groove 411. If the positioning block 415 is separated from the perforation 33 and the valve seat 41 is deflected, the conical protrusion contacts the opening edge of the locking groove 411, which plays a guiding role for the locking rod 52 to be inserted into the locking groove 411, so that the locking rod 52 is convenient to be inserted into the locking groove 411.

[0056] Reference Figure 2 The valve flap 42 is arranged in the cavity 11, and the valve flap 42 cooperates with the valve seat 41 to block the discharge hole 31. The valve stem 43 is inserted into the mounting hole 12, and one end of the valve stem 43 is threadedly connected to the valve flap 42. A folding tube 6 is arranged on the outer sleeve of the valve stem 43, one end of the folding tube 6 is fixedly connected to the valve flap 42, and the other end of the folding tube 6 is connected to the inner wall of the cavity 11.

[0057] The driving member 44 includes a mounting plate 441, a support rod 442, a support plate 443 and a hydraulic device 444. The mounting plate 441 is arranged above the valve body 1. The support rod 442 is fixedly connected to the end face of the mounting plate 441 away from the valve body 1. The support plate 443 is fixedly connected to the end face of the support rod 442 away from the mounting plate 441. The hydraulic device 444 is arranged on the side of the support plate 443 away from the valve body 1, and the hydraulic device 444 is used to drive the valve stem 43 to move along the axial direction of the mounting hole 12. The hydraulic device 444 adopts a hydraulic cylinder, and the piston rod of the hydraulic cylinder is fixedly connected to the valve stem 43.

[0058] The implementation principle of a hydraulic needle valve in an embodiment of the present application is as follows: when the valve seat 41 needs to be replaced, a force is first applied to the limit plate 518 to make the limit plate 518, the push rod 516 and the push block 517 move toward the axis of the operating ring 51, and the push block 517 drives the plug block 533 to disengage from the slot 514; then the operating ring 51 is driven to rotate, so that the first operating surface is close to the operating block 53, so that the operating block 53 is no longer in contact with the locking plane 513, and the unlocking spring 414 is reset to drive the unlocking block 413 to move, so that the unlocking block 413 drives the locking rod 52 to move, so that the locking rod 52 is disengaged from the locking groove 411; then, the staff can separate the valve seat 41 from the valve body 1.

[0059] On the contrary, first install the new valve seat 41 into the installation ring groove 32, and during the installation process, make the positioning block 415 completely embedded in the locking groove 411, and at the same time, the unlocking spring 414 is further compressed and deformed; then drive the valve seat 41 to rotate, and when the locking groove 411 is aligned with the through hole 33, the unlocking spring 414 resets and drives the positioning block 415 to be inserted into the through hole 33, and at the same time, the limit block 416 abuts against the inner circumferential surface of the installation ring groove 32; then drive the operating ring 51 to rotate, and drive the operating block 53 through the guide surface 512 The operating block 53 moves toward the axial direction of the operating ring 51, and drives the locking rod 52 to move, so that the locking rod 52 pushes the positioning block 415 and inserts the locking rod 52 into the locking groove 411 until the operating block 53 contacts the locking plane 513. When the storage groove 531 is aligned with the insertion hole 515, the operating spring 532 resets and drives the insertion block 533 to be inserted into the insertion slot 514, thereby realizing the locking among the operating block 53, the operating ring 51, the valve body 1, and the valve seat 41, so that the valve seat 41 is not easily moved in the valve body 1.

[0060] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0061] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic needle valve, comprising a valve body (1), a feed pipe (2) being arranged on the side of the valve body (1), and a discharge pipe (3) being arranged below the valve body (1), characterized in that: The valve body (1) is provided with a cavity (11), a side of the feed pipe (2) away from the valve body (1) is provided with a feed hole (21) connected to the cavity (11), a side of the discharge pipe (3) away from the valve body (1) is provided with a discharge hole (31) connected to the cavity (11), and a sealing structure (4) for sealing the discharge hole (31) is provided in the valve body (1); an inner wall of the discharge hole (31) is provided with a mounting ring groove (32 ), one end of the mounting annular groove (32) is connected to the cavity (11), the blocking structure (4) comprises a valve seat (41) arranged in the mounting annular groove (32), the valve seat (41) is annular, and a locking structure (5) is provided between the valve seat (41) and the discharge pipe (3) to connect the two; a through hole (33) connected to the mounting annular groove (32) is provided on the outer circumferential surface of the discharge pipe (3), and the locking structure (5) comprises a rotary An operating ring (51) movably connected to the outside of the discharge pipe (3) and a locking rod (52) penetrated into the through hole (33), the inner circumferential surface of the operating ring (51) is provided with an operating groove (511) which can be aligned with the through hole (33), the operating groove (511) is provided with an operating block (53) which can be inserted into the through hole (33), the operating groove (511) includes a first operating surface and a second operating surface along the circumferential direction of the operating ring (51), the bottom wall of the operating groove (511) includes adjacent guide surfaces (512) and a locking plane (513), the distance between the guide surface (512) and the axis of the operating ring (51) gradually decreases along the end surface close to the second operating surface, the locking plane (513) is located on the side of the guide surface (512) close to the second operating surface, and the outer circumferential surface of the valve seat (41) is provided with a locking groove (411) into which the locking rod (52) can be inserted; A storage groove (531) is provided at one end of the operating block (53) away from the axis of the operating ring (51), an insert block (533) and an operating spring (532) are arranged in the storage groove (531), the operating spring (532) is in a compressed state, one end of the operating spring (532) abuts against the bottom wall of the storage groove (531), the other end of the operating spring (532) abuts against the insert block (533), and a slot (514) capable of inserting the insert block (533) is provided on the locking plane (513); The operating ring (51) is provided with an operating member for driving the plug block (533) to disengage from the slot (514); a plug hole (515) is provided on the bottom wall of the slot (514); the operating member comprises a push block (517) arranged in the slot (514); a push rod (516) penetrating the plug hole (515) is provided on one side of the push block (517) facing the bottom wall of the slot (514); and a limit plate (518) is provided on one end of the push rod (516) away from the push block (517).

2. A hydraulic needle valve according to claim 1, characterized in that: An unlocking spring (414) and an unlocking block (413) are arranged in the locking groove (411); one end of the unlocking spring (414) is connected to the bottom wall of the locking groove (411), and the other end of the unlocking spring (414) is connected to the unlocking block (413); when the locking rod (52) is inserted into the locking groove (411) and contacts the unlocking block (413), the unlocking spring (414) is in a compressed state.

3. A hydraulic needle valve according to claim 2, characterized in that: The locking groove (411) is provided with a limiting groove (412) on the inner wall close to the cavity (11); the limiting groove (412) penetrates the valve seat (41) in a direction away from the bottom wall of the locking groove (411); and the unlocking block (413) is provided with a limiting block (416) inserted into the limiting groove (412).

4. A hydraulic needle valve according to claim 2, characterized in that: A positioning block (415) is provided on a side of the unlocking block (413) away from the unlocking spring (414); an end surface of the positioning block (415) away from the unlocking block (413) is an arc-shaped surface, and the through hole (33) can be inserted into the positioning block (415).

5. A hydraulic needle valve according to claim 1, characterized in that: The valve seat (41) is provided with an elastic positioning block (415), the end surface of the positioning block (415) away from the axis of the valve seat (41) is an arc-shaped surface, and the inner circumferential surface of the mounting ring groove (32) is provided with a positioning groove for inserting the positioning block (415).

6. A hydraulic needle valve according to claim 1, characterized in that: The end surface of the locking rod (52) away from the discharge hole (31) is provided with a positioning rod (521) capable of being inserted into the operating groove (511), and the end surface of the operating block (53) facing the axis of the operating ring (51) is provided with a groove (534) capable of being inserted into the positioning rod (521), and the groove (534) penetrates the operating block (53) toward one side of the first operating surface.

7. A hydraulic needle valve according to claim 1, characterized in that: The cavity (11) is provided with a mounting hole (12) on the inner wall away from the discharge hole (31); the blocking structure (4) further comprises a valve flap (42) arranged in the cavity (11); the valve flap (42) is capable of blocking the discharge hole (31); a valve stem (43) is provided on the side of the valve flap (42) away from the discharge hole (31); the valve stem (43) passes through the mounting hole (12) and extends outside the valve body (1); and a driving member (44) capable of driving the valve flap (42) to move along the axis of the mounting hole (12) is provided on the valve body (1).

8. A hydraulic needle valve according to claim 7, characterized in that: The valve stem (43) is provided with a folding tube (6) located in the cavity (11) on its outer sleeve, one end of the folding tube (6) is connected to the valve flap (42), and the other end of the folding tube (6) is connected to the inner wall of the cavity (11).

Images