Flow regulating needle valve

Abstract

This utility model belongs to the field of valve technology, specifically relating to a flow regulating needle valve. The flow regulating needle valve includes: a valve body; an adjusting screw disposed within the valve body; a linkage mechanism comprising: a linkage sleeve and an elastic pressing component, the elastic pressing component being connected to the adjusting screw so that the linkage sleeve abuts against the adjusting screw; and a handwheel connected to the valve body and the linkage sleeve. The handwheel is adapted to engage a second internal meshing gear pair for self-locking by pressing down. Simultaneously, when the second internal meshing gear pair engages, the handwheel is adapted to rotate the linkage sleeve to compress the elastic pressing component, causing the end-face spline gear pair to slide axially, thus bringing the adjusting screw to a standstill. This flow regulating needle valve, by setting a linkage mechanism on the adjusting screw, allows for self-adjustment through axial sliding of the linkage mechanism when the handwheel is pressed down for self-locking and engages, thereby preventing the adjusting screw from rotating and causing a change in flow rate.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to regulating valves, and more particularly to a flow regulating needle valve. Background Technology

[0002] In liquid delivery pipelines, flow regulation is required. Currently used manual flow regulating valves basically employ the method of rotating a handwheel to drive the adjusting screw to rotate, thereby adjusting the valve core. By adjusting the gap between the valve core and the valve seat, the purpose of flow regulation is achieved.

[0003] To prevent accidental operation of the handwheel, it will self-lock after adjustment. In related technologies, a pressable handwheel is generally used, that is, by pressing the handwheel, the teeth on the handwheel mesh with the teeth on the valve body, thereby achieving locking.

[0004] However, in the above scenario, because the teeth on the handwheel are disengaged from the teeth on the valve body when adjusting, when the handwheel stops rotating, the teeth on the handwheel and the teeth on the valve body become misaligned. This causes the teeth on the handwheel to collide with the teeth on the valve body when the handwheel is pressed, which in turn causes the handwheel to rotate slightly so that its teeth mesh with the teeth on the valve body. At this time, the adjusting screw will rotate with the handwheel, causing the flow rate to change.

[0005] Therefore, how to solve the technical problem of flow rate change caused by tooth collision during handwheel self-locking is a problem that urgently needs to be solved by those skilled in the art.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one flow regulating needle valve, comprising: a valve body; an adjusting screw disposed within the valve body; a linkage mechanism comprising: a linkage sleeve and an elastic pressing component, the elastic pressing component being connected to the adjusting screw such that the linkage sleeve abuts against the adjusting screw; a handwheel connected to the valve body and the linkage sleeve; wherein the linkage sleeve and the adjusting screw are engaged by an end-face spline gear pair; the handwheel and the linkage sleeve are engaged by a first internal meshing gear pair; a disengaged second internal meshing gear pair is provided between the handwheel and the valve body; the handwheel is adapted to rotate the linkage sleeve to cause the adjusting screw to rotate accordingly; the handwheel is adapted to engage the second internal meshing gear pair for self-locking by pressing down, and simultaneously, when the second internal meshing gear pair engages, the handwheel is adapted to rotate the linkage sleeve to compress the elastic pressing component, causing the end-face spline gear pair to slide axially and thus bring the adjusting screw to a standstill.

[0008] In one optional embodiment, the elastic pressing assembly includes: a connector and a spring; wherein the connector is adapted to pass through a linkage sleeve and connect to an adjusting screw; the spring is sleeved on the connector and adapted to push the linkage sleeve against the end face of the adjusting screw; when the handwheel is rotated, the linkage sleeve is adapted to follow the rotation of the handwheel to compress the spring to generate axial sliding, and simultaneously drive the adjusting screw to rotate after axially sliding to abut against the connector.

[0009] In one optional embodiment, the connector is T-shaped, having a vertical connecting portion and a horizontal limiting portion; wherein the spring is sleeved on the connecting portion, and its two ends abut against the limiting portion and the linkage sleeve respectively; when the handwheel is rotated, the linkage sleeve slides axially to abut against the limiting portion and then drives the adjusting screw to rotate.

[0010] In one optional embodiment, a mounting groove is provided at the axis of the linkage sleeve; wherein the spring is located in the mounting groove; the inner diameter of the mounting groove is smaller than the outer diameter of the limiting part.

[0011] In one optional embodiment, the end-face spline gear pair includes: a spline tooth portion and a spline groove portion; wherein the end face of the linkage sleeve has the spline tooth portion or the spline groove portion; the end face of the adjusting screw has the spline tooth portion or the spline groove portion adapted to the linkage sleeve.

[0012] In one optional embodiment, the first internal meshing gear pair includes: a first internal tooth portion and a first external tooth portion; the handwheel has the first internal tooth portion; and the side wall of the linkage sleeve has the first external tooth portion.

[0013] In one optional embodiment, the second internal meshing gear pair includes: a second internal tooth portion and a second external tooth portion; the handwheel has the second internal tooth portion; and the side wall of the valve body has the second external tooth portion.

[0014] In one optional embodiment, the handwheel has a first insertion ring and a second insertion ring; wherein the first insertion ring and the second insertion ring are coaxially arranged, and the first insertion ring is located inside the second insertion ring; the inner wall of the first insertion ring has a first internal tooth portion; and the inner wall of the second insertion ring has a second internal tooth portion.

[0015] In one optional embodiment, the valve body has a first limiting ring groove and a second limiting ring groove on its side wall; the first limiting ring groove is located above the second limiting ring groove; the inner wall of the second insertion ring has a limiting protrusion, and the limiting protrusion is located below the second internal tooth portion; when the handwheel is rotated, the limiting protrusion is located in the first limiting ring groove, and the second internal meshing gear pair is in a disengaged state; and when the handwheel is pressed down for self-locking, the limiting protrusion is located in the second limiting ring groove, and the second internal meshing gear pair is in a meshed state.

[0016] In one alternative embodiment, the sidewall of the second insertion ring has a plurality of snap-fit ​​portions; the inner wall of the snap-fit ​​portions is provided with protrusions, and each of the protrusions is adapted to form the limiting protrusion ring.

[0017] The beneficial effect of this utility model is that the flow regulating needle valve has a linkage mechanism set on the regulating screw. The handwheel drives the linkage mechanism to rotate, and then the linkage mechanism drives the regulating screw to rotate to regulate the flow. Thus, when the handwheel is pressed down and self-locking occurs, the linkage mechanism generates self-adjustment through axial sliding, thereby avoiding the situation where the regulating screw is driven to rotate and the flow changes.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a flow regulating needle valve provided in an embodiment of the present disclosure; Figure 2 A cross-sectional view of a flow regulating needle valve provided in an embodiment of this disclosure; Figure 3 A schematic diagram of a transmission structure for a handwheel, a linkage sleeve, and an adjusting screw provided in an embodiment of this disclosure; Figure 4This is a schematic diagram of the structure of an elastic compression assembly provided in an embodiment of the present disclosure; Figure 5 An exploded view of a handwheel, linkage mechanism, and adjusting screw provided in an embodiment of this disclosure; Figure 6 A cross-sectional view of a handwheel provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of the structure of a valve body provided in an embodiment of this disclosure.

[0022] In the picture: Valve body 1, first limiting ring groove 11, second limiting ring groove 12; Adjusting screw 2; Linkage mechanism 3, linkage sleeve 31, mounting groove 311, elastic pressing component 32, connector 321, connecting part 321a, limiting part 321b, spring 322; Handwheel 4, first insertion ring 41, second insertion ring 42, limiting protrusion ring 421, buckle part 422, protrusion 423; 5. End face spline gear pair; 51. Spline tooth part; 52. Spline groove part; First internal meshing gear pair 6, first internal tooth portion 61, first external tooth portion 62; Second internal meshing gear pair 7, second internal tooth section 71, second external tooth section 72. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0025] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] like Figures 1 to 3 As shown, at least one embodiment provides a flow regulating needle valve, including: a valve body 1, an adjusting screw 2, a linkage mechanism 3, and a handwheel 4.

[0027] Specifically, the adjusting screw 2 is installed inside the valve body 1, with one end extending out of the valve body 1.

[0028] Specifically, the linkage mechanism 3 includes a linkage sleeve 31 and an elastic pressing component 32. The elastic pressing component 32 is connected to the extended end of the adjusting screw 2 to abut the linkage sleeve 31 against the end face of the adjusting screw 2. The linkage sleeve 31 and the adjusting screw 2 are engaged by an end face spline gear pair 5.

[0029] Specifically, the handwheel 4 is mounted on the valve body 1 and connected to the linkage sleeve 31, and is used to drive the linkage sleeve 31 to rotate; wherein, the handwheel 4 and the linkage sleeve 31 are engaged by the first internal meshing gear pair 6, and a second internal meshing gear pair 7 with disengaged teeth is provided between the handwheel 4 and the valve body 1.

[0030] In this embodiment, when the handwheel 4 rotates, the second internal meshing gear pair 7 is in a disengaged state. At this time, the handwheel 4 drives the linkage sleeve 31 to rotate, thereby causing the adjusting screw 2 to rotate to adjust the flow rate. When the handwheel 4 is pressed to lock, the second internal meshing gear pair 7 will engage. When the second internal meshing gear pair 7 experiences tooth collision during engagement, the handwheel 4 will rotate slightly. At this time, the handwheel 4 drives the linkage sleeve 31 to rotate and causes the end face spline gear pair 5 to slide axially through the compression elastic pressing component 32, thereby preventing the adjusting screw 2 from rotating and thus preventing changes in the flow rate, which greatly improves the flow rate adjustment accuracy.

[0031] like Figure 4 As shown, in some embodiments, the elastic pressing assembly 32 includes a connector 321 and a spring 322.

[0032] Specifically, the connector 321 passes through the linkage sleeve 31 and connects to the end face of the adjusting screw 2.

[0033] Specifically, the spring 322 is sleeved on the connector 321 and is used to push the linkage sleeve 31 against the end face of the adjusting screw 2, so that the end face spline gear pair 5 is in a meshing state.

[0034] In this embodiment, when the handwheel 4 rotates, the linkage sleeve 31 rotates with the handwheel 4 to compress the spring 322 and generate axial sliding. At the same time, after axially sliding to abut against the connecting piece 321, it drives the adjusting screw 2 to rotate. That is, although the linkage sleeve 31 has axially slid, there is a distance limit to the axial sliding, so that the linkage sleeve 31 can still drive the adjusting screw 2 to rotate.

[0035] like Figure 4 As shown, in some embodiments, the connector 321 is T-shaped, having a vertical connecting portion 321a and a horizontal limiting portion 321b.

[0036] Specifically, the spring 322 is sleeved on the connecting part 321a, and its two ends abut against the limiting part 321b and the linkage sleeve 31 respectively.

[0037] In this embodiment, when the handwheel 4 rotates, the linkage sleeve 31 slides axially to abut against the limiting part 321b, thereby driving the adjusting screw 2 to rotate.

[0038] like Figure 4 As shown, in some embodiments, a mounting groove 311 is provided at the axis of the linkage sleeve 31; wherein the spring 322 is located in the mounting groove 311.

[0039] Specifically, the inner diameter of the mounting groove 311 is smaller than the outer diameter of the limiting part 321b.

[0040] In this embodiment, when the linkage sleeve 31 slides axially, since the inner diameter of the mounting groove 311 is smaller than the outer diameter of the limiting part 321b, the linkage sleeve 31 will abut against the limiting part 321b, thereby limiting the retraction distance of the linkage sleeve 31, that is, limiting the end face spline gear pair 5 from completely disengaging.

[0041] like Figure 5 As shown, in some embodiments, the end face spline gear pair 5 includes: a spline tooth portion 51 and a spline groove portion 52.

[0042] Specifically, the end face of the linkage sleeve 31 has a spline tooth portion 51 or a spline groove portion 52; the end face of the adjusting screw 2 has a spline tooth portion 51 or a spline groove portion 52 that is adapted to the linkage sleeve 31.

[0043] like Figure 5 As shown, in some embodiments, the first internal meshing gear pair 6 includes a first internal tooth portion 61 and a first external tooth portion 62.

[0044] Specifically, the handwheel 4 has a first internal toothed portion 61; the side wall of the linkage sleeve 31 has a first external toothed portion 62.

[0045] like Figure 6 , Figure 7 As shown, in some embodiments, the second internal meshing gear pair 7 includes: a second internal tooth portion 71 and a second external tooth portion 72.

[0046] Specifically, the handwheel 4 has a second internal tooth 71; the side wall of the valve body 1 has a second external tooth 72.

[0047] like Figure 6 As shown, in some embodiments, the handwheel 4 has a first insertion ring 41 and a second insertion ring 42.

[0048] Specifically, the first insertion ring 41 and the second insertion ring 42 are coaxially arranged, and the first insertion ring 41 is located inside the second insertion ring 42; the inner wall of the first insertion ring 41 has a first internal tooth portion 61; the inner wall of the second insertion ring 42 has a second internal tooth portion 71.

[0049] like Figure 7 As shown, in some embodiments, the valve body 1 has a first limiting ring groove 11 and a second limiting ring groove 12 on its side wall.

[0050] Specifically, the first limiting ring groove 11 is located above the second limiting ring groove 12; the inner wall of the second insertion ring 42 has a limiting protrusion 421, and the limiting protrusion 421 is located below the second internal tooth portion 71.

[0051] In this embodiment, when the handwheel 4 rotates, the limiting protrusion 421 is located in the first limiting ring groove 11, and the second internal meshing gear pair 7 is in a disengaged state; and when the handwheel 4 is pressed down to self-lock, the limiting protrusion 421 is located in the second limiting ring groove 12, and the second internal meshing gear pair 7 is in a meshed state.

[0052] like Figure 5 As shown, in some embodiments, the sidewall of the second insertion ring 42 has a plurality of snap-fit ​​portions 422.

[0053] Specifically, the inner wall of the latching part 422 is provided with protrusions 423, and each protrusion 423 is adapted to form a limiting protrusion 421.

[0054] In summary, this flow regulating needle valve, by setting a linkage mechanism 3 on the regulating screw 2, allows the handwheel 4 to drive the linkage mechanism 3 to rotate, which in turn drives the regulating screw 2 to rotate, thereby regulating the flow. This ensures that when the handwheel 4 is pressed down and self-locks, causing a tooth impact, the axial sliding of the linkage mechanism 3 generates self-adjustment, thus avoiding the situation where the regulating screw 2 rotates and causes a change in flow.

[0055] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0056] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0057] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0058] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0059] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0060] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0061] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0062] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0063] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0064] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A flow regulating needle valve, characterized in that, include: Valve body (1); Adjusting screw (2) is installed inside valve body (1); The linkage mechanism (3) includes: a linkage sleeve (31) and an elastic pressing component (32), wherein the elastic pressing component (32) is connected to the adjusting screw (2) so that the linkage sleeve (31) abuts against the adjusting screw (2); The handwheel (4) is connected to the valve body (1) and the linkage sleeve (31); wherein The linkage sleeve (31) and the adjusting screw (2) are engaged by the end face spline gear pair (5); The handwheel (4) and the linkage sleeve (31) are engaged by the first internal meshing gear pair (6); A second internal meshing gear pair (7) with teeth removed is provided between the handwheel (4) and the valve body (1). The handwheel (4) is adapted to rotate the linkage sleeve (31) so that the adjusting screw (2) rotates accordingly; The handwheel (4) is adapted to engage the second internal meshing gear pair (7) by pressing down to lock itself. At the same time, when the second internal meshing gear pair (7) hits the teeth, the handwheel (4) is adapted to drive the linkage sleeve (31) to rotate and compress the elastic pressing component (32), so that the end face spline gear pair (5) will slide axially to make the adjusting screw (2) stop.

2. The flow regulating needle valve as described in claim 1, characterized in that, The elastic pressing assembly (32) includes: a connector (321) and a spring (322); wherein The connector (321) is adapted to pass through the linkage sleeve (31) and connect to the adjusting screw (2); The spring (322) is sleeved on the connector (321) and is suitable for pushing the linkage sleeve (31) to abut against the end face of the adjusting screw (2); When the handwheel (4) rotates, the linkage sleeve (31) is adapted to follow the rotation of the handwheel (4) to compress the spring (322) to generate axial sliding, and at the same time, after axially sliding to abut against the connector (321), it drives the adjusting screw (2) to rotate.

3. The flow regulating needle valve as described in claim 2, characterized in that, The connector (321) is T-shaped, having a vertical connecting portion (321a) and a horizontal limiting portion (321b); wherein The spring (322) is sleeved on the connecting part (321a), and its two ends abut against the limiting part (321b) and the linkage sleeve (31) respectively; When the handwheel (4) rotates, the linkage sleeve (31) slides axially to abut against the limiting part (321b) and drives the adjusting screw (2) to rotate.

4. The flow regulating needle valve as described in claim 3, characterized in that, The linkage sleeve (31) has a mounting groove (311) at its shaft center; wherein The spring (322) is located in the mounting groove (311); The inner diameter of the mounting groove (311) is smaller than the outer diameter of the limiting part (321b).

5. The flow regulating needle valve as described in claim 1, characterized in that, The end-face spline gear pair (5) includes: a spline tooth portion (51) and a spline groove portion (52); wherein The end face of the linkage sleeve (31) has the spline tooth portion (51) or the spline groove portion (52). The end face of the adjusting screw (2) has the spline tooth portion (51) or the spline groove portion (52) adapted to the linkage sleeve (31).

6. The flow regulating needle valve as described in claim 1, characterized in that, The first internal meshing gear pair (6) includes: a first internal tooth portion (61) and a first external tooth portion (62); The handwheel (4) has the first internal toothed portion (61). The linkage sleeve (31) has the first external toothed portion (62) on its side wall.

7. The flow regulating needle valve as described in claim 6, characterized in that, The second internal meshing gear pair (7) includes: a second internal tooth portion (71) and a second external tooth portion (72); The handwheel (4) has a second internal tooth (71). The valve body (1) has a second external tooth (72) on its side wall.

8. The flow regulating needle valve as described in claim 7, characterized in that, The handwheel (4) has a first insertion ring (41) and a second insertion ring (42); wherein The first plug ring (41) and the second plug ring (42) are coaxially arranged, and the first plug ring (41) is located inside the second plug ring (42); The first insertion ring (41) has the first internal toothed portion (61) on its inner wall. The second insertion ring (42) has a second internal tooth (71) on its inner wall.

9. The flow regulating needle valve as described in claim 8, characterized in that, The valve body (1) has a first limiting annular groove (11) and a second limiting annular groove (12) on its side wall. The first limiting annular groove (11) is located above the second limiting annular groove (12); The inner wall of the second insertion ring (42) has a limiting protrusion (421), and the limiting protrusion (421) is located below the second internal tooth portion (71); When the handwheel (4) rotates, the limiting convex ring (421) is located in the first limiting ring groove (11), and the second internal meshing gear pair (7) is in a disengaged state; and When the handwheel (4) is pressed down and locked, the limiting protrusion (421) is located in the second limiting ring groove (12), and the second internal meshing gear pair (7) is in the meshing state.

10. The flow regulating needle valve as described in claim 9, characterized in that, The side wall of the second insertion ring (42) has several latching parts (422). The inner wall of the latching part (422) is provided with protrusions (423), and each of the protrusions (423) is adapted to form the limiting protrusion (421).

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