High-flow adjusting needle valve

Abstract

The invention relates to the technical field of needle valves, in particular to a high-flow adjusting needle valve which comprises a needle valve body, an adjusting sleeve, a valve rod, a valve element, an elastic piece and an elastic protective sleeve, the needle valve body comprises a valve bonnet and a valve seat, and a flow channel allowing fluid to flow is formed in the valve seat; the adjusting sleeve is inserted into the needle valve body and can slide in the axis direction of the adjusting sleeve. The valve rod is inserted into the adjusting sleeve in a threaded mode and can rotate around the axis of the valve rod and slide in the axis direction of the valve rod. The valve element is arranged on the valve rod and can be separated from or make contact with the valve seat so as to change the opening degree of the flow channel. Under the action of the elastic piece, the valve element has the trend of blocking the flow channel; the valve rod is sleeved with the elastic protection sleeve, the elastic protection sleeve can slide relative to the valve rod in the axis direction of the elastic protection sleeve, the elastic protection sleeve has a first position and a second position correspondingly before and after sliding, and when the elastic protection sleeve is located at the second position, the valve element is wrapped by the elastic protection sleeve, so that when the high-flow adjusting needle valve is in an open state, the valve element can be protected.

Description

Technical Field

[0001] The invention relates to the technical field of needle valves, in particular to a high flow regulating needle valve. Background Art

[0002] As a key control element, the needle valve works by adjusting the contact state between the needle valve core and the valve seat to achieve fluid switching, flow regulation and cut-off operations. It has significant characteristics such as simple structure, sensitive response and precise control, and is widely used in various industrial fields and equipment involving fluid control.

[0003] In the related technology, for example, Chinese patent application CN108953728A discloses a self-locking flow regulating needle valve, in which the valve core and valve seat adopt a sixty-degree cone fit, which has good self-centering and sealing effects. When the valve core is completely in contact with the valve seat, the inlet and outlet flow channels can be completely disconnected to achieve zero flow output.

[0004] However, the above-mentioned self-locking flow regulating needle valve also has some problems in actual use. When the self-locking flow regulating needle valve is in an open state, the valve core will inevitably be affected by the impact of the fluid. Under long-term impact, it is very easy to cause defects such as erosion and pits on the surface of the valve core, which will lead to the problem of poor sealing when the valve core cooperates with the valve seat after long-term fluid impact, thereby affecting the performance of the needle valve. Summary of the invention

[0005] Based on this, it is necessary to provide a high flow regulating needle valve to address the problem of poor performance of the current needle valve.

[0006] The above purpose is achieved through the following technical solutions: A high flow regulating needle valve, the high flow regulating needle valve comprising: A needle valve body, the needle valve body comprising a valve cap and a valve seat, wherein a flow channel for fluid flow is formed in the valve seat; An adjusting sleeve is inserted into the needle valve body and can slide along its own axis direction; The valve stem is threadedly inserted into the adjusting sleeve and can rotate around its own axis and slide along its own axis; a valve core, disposed on the valve stem and configured to be able to separate from or contact the valve seat to change the degree of opening of the flow channel; An elastic member, disposed between the valve cap and the adjusting sleeve, wherein the valve core has a tendency to block the flow channel under the action of the elastic member; An elastic protective sleeve is sleeved on the valve stem and can respectively form a stop fit with the valve stem and the valve seat. The elastic protective sleeve can slide along its own axial direction relative to the valve stem and has a corresponding first position and second position before and after sliding. The first position is farther away from the valve core than the second position. When in the second position, the elastic protective sleeve wraps around the valve core.

[0007] Further, a first annular bulge is arranged in the valve seat; a second annular bulge is arranged on the elastic protective sleeve, and the second annular bulge and the first annular bulge have an overlapping area in the extension direction of the valve stem to form a stop fit; a third annular bulge is arranged on the valve stem, and the third annular bulge and the second annular bulge have an overlapping area in the extension direction of the valve stem to form a stop fit; a sliding groove is arranged on the valve stem, and the sliding groove extends along the extension direction of the valve stem, and one end extends to the third annular bulge, and the other end extends to the position where the elastic protective sleeve can just completely wrap the valve core, and a sliding block is arranged on the inner circumferential wall of the elastic protective sleeve, and the sliding block is slidably inserted in the sliding groove, or a sliding groove is arranged on the inner circumferential wall of the elastic protective sleeve, and a sliding block is arranged on the valve stem.

[0008] Furthermore, the elastic protective sleeve includes an outer layer and an inner layer which are sleeved together, and the outer layer is an elastic sleeve-shaped structure, and the outer layer is sleeved on the inner layer; the inner layer is a plastic structure and is configured to support the outer layer.

[0009] Furthermore, the high-flow regulating needle valve also includes an anti-excessive deformation component, and the anti-excessive deformation component is configured to reduce the force of the elastic member on the elastic protective sleeve.

[0010] Furthermore, the anti-excessive deformation component includes a plurality of spacers and a plurality of guide strips, the plurality of spacers are arranged circumferentially on the inner circumferential wall of the valve bonnet, channels are formed between adjacent spacers, and the spacers extend along the axial direction of the valve bonnet; the plurality of guide strips are arranged circumferentially on the outer circumferential wall of the adjustment sleeve, and are respectively arranged corresponding to the channels, each of the guide strips has a fixed section and an elastic section, the elastic section is inclined, and can be elastically deformed under the pushing of the spacers.

[0011] Furthermore, the high flow regulating needle valve also includes an elastic sealing ring, which is sleeved on the elastic protective sleeve and located at one end of the elastic protective sleeve close to the valve core, and the elastic sealing ring is configured to seal the valve stem and the valve seat.

[0012] Furthermore, the high flow regulating needle valve further comprises a first sealing member, wherein the first sealing member is configured to seal the regulating sleeve, the valve stem and the valve seat.

[0013] Furthermore, a threaded fit is formed between the valve cap and the valve seat.

[0014] Furthermore, the high flow regulating needle valve further comprises a second sealing member, wherein the second sealing member is configured to seal the valve cap, the valve seat and the regulating sleeve.

[0015] Furthermore, the high-flow regulating needle valve also includes a hand lever, which is arranged on the valve stem and located outside the valve seat.

[0016] The beneficial effects of the present invention are: In the use process of a high flow regulating needle valve provided by the present invention, when the elastic protective sleeve is switched from the first position to the second position, the valve core and the elastic protective sleeve generate relative movement, so that the elastic protective sleeve can effectively clean the impurities, particles and other foreign matters that may exist on the surface of the valve core, and avoid these foreign matters affecting the sealing performance when the valve core and the valve seat are matched again; when the elastic protective sleeve is in the second position, the elastic protective sleeve wraps the valve core; when the high flow regulating needle valve is switched from the closed state to the open state, the elastic protective sleeve and the valve seat generate relative movement, so that the elastic protective sleeve can effectively clean the impurities, particles and other foreign matters that may exist on the surface of the valve seat, and avoid these foreign matters affecting the sealing performance when the valve seat and the valve core are matched again; when the high flow regulating needle valve is in the open state, the fluid flows in the flow channel. At this time, since the elastic protective sleeve wraps the valve core, the fluid can be prevented from directly impacting the surface of the valve core, while protecting the integrity of the valve core surface, it is ensured that the sealing performance of the valve core and the valve seat are not affected when they contact again, thereby ensuring the stability and reliability of the high flow regulating needle valve during long-term use, and improving the use performance of the high flow regulating needle valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a high-flow regulating needle valve provided in an embodiment of the present invention; Figure 2 A cross-sectional view of a high flow regulating needle valve provided in an embodiment of the present invention Figure 1 ; Figure 3 for Figure 2 A schematic diagram of the partially enlarged structure at center A; Figure 4 A cross-sectional view of a high flow regulating needle valve provided in an embodiment of the present invention Figure 2 ; Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure at B in the middle; Figure 6 A cross-sectional view of a high flow regulating needle valve provided in an embodiment of the present invention Figure 3 ; Figure 7 for Figure 6 A schematic diagram of the partially enlarged structure at C in the middle; Figure 8 A schematic diagram of a three-dimensional cross-sectional structure of a valve cap of a high-flow regulating needle valve provided in an embodiment of the present invention; Fig. 9 A schematic diagram of the parts explosion of a high flow regulating needle valve provided by an embodiment of the present invention; Fig.10 for Fig. 9 Schematic diagram of the local enlarged structure at point D in the middle.

[0018] in: 1. Needle valve body; 101. Valve cap; 102. Valve seat; 1021. Flow channel; 1022. First ring convex; 2. Adjusting sleeve; 3. Valve stem; 301. Third ring convex; 4. Valve core; 5. Compression spring; 6. Elastic protective sleeve; 601. Outer layer; 6011. Second ring convex; 602. Inner layer; 701. Spacer; 7011. Channel; 7012. Spacer strip; 702. Guide strip; 7021. Fixed section; 7022. Elastic section; 8. Elastic sealing ring; 9. First sealing ring; 10. Second sealing ring; 11. Hand lever; 12. Lock pin. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned herein, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] like Figures 1 to 10 As shown, the high flow regulating needle valve provided in the embodiment of the present invention is configured to include a needle valve body 1 , an adjusting sleeve 2 , a valve stem 3 , a valve core 4 , an elastic member and an elastic protective sleeve 6 . The needle valve body 1 includes a valve cap 101 and a valve seat 102, and a flow channel 1021 for fluid flow is formed in the valve seat 102; the adjusting sleeve 2 is inserted in the needle valve body 1 and can slide along its own axis; the valve stem 3 is threadedly inserted in the adjusting sleeve 2 and can rotate around its own axis and slide along its own axis; the valve core 4 is arranged on the valve stem 3 and is configured to be able to separate from or contact the valve seat 102 to change the opening degree of the flow channel 1021; the elastic member is arranged between the valve cap 101 and the adjusting sleeve 2, and the valve core 4 has a tendency to block the flow channel 1021 under the action of the elastic member; the elastic protective sleeve 6 is sleeved on the valve stem 3, and can form a stopper with the valve stem 3 and the valve seat 102 respectively, the elastic protective sleeve 6 can slide relative to the valve stem 3 along its own axis, and has a corresponding first position and a second position before and after sliding, the first position is arranged farther away from the valve core 4 than the second position, and when in the second position, the elastic protective sleeve 6 wraps the valve core 4.

[0023] Specifically in this embodiment, take the needle valve body 1 as an example when it is placed vertically. Figure 2 As shown, the flow channel 1021 is horizontally arranged inside the valve seat 102; in order to facilitate the installation of the valve bonnet 101, the adjusting sleeve 2, the valve stem 3, the valve core 4 and the elastic protective sleeve 6, a first mounting hole is opened on the top of the valve seat 102, and the first mounting hole is communicated with the flow channel 1021. The valve bonnet 101 is covered on the top of the valve seat 102 during installation to prevent dust and other impurities from entering the needle valve body 1 through the first mounting hole. The adjusting sleeve 2 is vertically arranged during installation and is inserted into the valve bonnet 101 and the first mounting hole at the same time. The valve stem 3 is vertically arranged during installation, and the top end passes through the top of the valve bonnet 101 for manual operation, and the bottom end is inserted into the first mounting hole. The valve core 4 is located at the bottom end of the valve stem 3 during installation to cooperate with the valve seat 102. The elastic protective sleeve 6 is vertically arranged during installation and is arranged close to the bottom end of the valve stem 3 to cooperate with the valve core 4.

[0024] Optionally, the elastic member can be configured as an elastic block or an elastic column, and the top end is arranged on the inner top wall of the valve cap 101, and the bottom end is arranged on the top end surface of the adjusting sleeve 2. Under the action of the elastic block or the elastic column, the adjusting sleeve 2 has a tendency to move downward, and the adjusting sleeve 2 has a tendency to drive the valve stem 3 and the valve core 4 to move downward through the threaded cooperation with the valve stem 3, so that the valve core 4 has a tendency to block the flow channel 1021, thereby ensuring the sealing between the valve core 4 and the valve seat 102 when the high-flow regulating needle valve is in a closed state.

[0025] Optionally, the number of elastic blocks or elastic columns can be two or more.

[0026] Optionally, when there are multiple elastic blocks or elastic columns, the multiple elastic blocks or elastic columns can be arranged evenly along the circumference of the valve stem 3 so that the forces acting on the adjustment sleeve 2 by the multiple elastic blocks or elastic columns can be evenly distributed.

[0027] Initially, if Figure 2 and Figure 3 As shown, the high flow regulating needle valve is in a closed state, at which time the elastic protective sleeve 6 is in the first position, and the valve core 4 and the valve seat 102 are in close contact to completely cut off the flow channel 1021.

[0028] When it is necessary to adjust the high-flow regulating needle valve from a closed state to an open state, the valve stem 3 is first driven to move upward, and the valve stem 3 simultaneously drives the adjusting sleeve 2, the valve core 4 and the elastic protective sleeve 6 to move upward, and the distance between the adjusting sleeve 2 and the valve cap 101 becomes shorter, so that the elastic member is compressed; when the valve stem 3 moves to the point where the elastic protective sleeve 6 and the valve seat 102 form a stop fit, as the valve stem 3 continues to move upward, the elastic protective sleeve 6 moves downward relative to the valve stem 3 and moves from the first position to the second position. When the elastic protective sleeve 6 moves to the second position, the elastic protective sleeve 6 wraps around the valve core 4. At this time, due to the relative movement between the valve core 4 and the elastic protective sleeve 6, under the elastic contraction of the elastic protective sleeve 6, the elastic protective sleeve 6 can effectively clean up foreign matter such as impurities and particles that may exist on the surface of the valve core 4, so as to prevent these foreign matters from affecting the sealing performance when the valve core 4 and the valve seat 102 fit together again.

[0029] Then, the valve stem 3 is loosened. Under the action of the elastic member, the adjusting sleeve 2 synchronously drives the valve stem 3 to move downward through the threaded cooperation with the valve stem 3. The valve stem 3 synchronously drives the valve core 4 and the elastic protective sleeve 6 to move downward. Figure 4 and Figure 5As shown, until the elastic protective sleeve 6 contacts the valve seat 102; then the valve stem 3 is rotated, and the valve stem 3 synchronously drives the valve core 4 and the elastic protective sleeve 6 to move upward while rotating through the threaded fit between the valve stem 3 and the adjusting sleeve 2 to open the flow channel 1021. During the rotation of the valve stem 3, due to the relative movement between the elastic protective sleeve 6 and the valve seat 102, the elastic protective sleeve 6 can effectively clean the impurities, particles and other foreign matter that may exist on the surface of the valve seat 102, so as to prevent these foreign matter from affecting the sealing performance when the valve seat 102 and the valve core 4 are matched again. When the fluid flows in the flow channel 1021, since the elastic protective sleeve 6 wraps the valve core 4, it can prevent the fluid from directly impacting the surface of the valve core 4, while protecting the integrity of the surface of the valve core 4, it ensures that the sealing performance of the valve core 4 and the valve seat 102 are not affected when they contact again, thereby ensuring the stability and reliability of the high-flow regulating needle valve during long-term use, and improving the performance of the high-flow regulating needle valve.

[0030] When it is necessary to adjust the high-flow regulating needle valve from the open state to the closed state, the valve stem 3 is first driven to move upward, and the valve stem 3 simultaneously drives the adjusting sleeve 2, the valve core 4 and the elastic protective sleeve 6 to move upward, and the distance between the adjusting sleeve 2 and the valve cap 101 becomes shorter, compressing the elastic part until the elastic protective sleeve 6 is disengaged from the stopper between the valve seat 102.

[0031] Then, the valve stem 3 is loosened. Under the action of the elastic member, the adjusting sleeve 2 synchronously drives the valve stem 3 to move downward through the threaded fit between the adjusting sleeve 2 and the valve stem 3. The valve stem 3 synchronously drives the valve core 4 and the elastic protective sleeve 6 to move downward. When the elastic protective sleeve 6 and the valve seat 102 form a stop fit, as the valve stem 3 moves downward, the elastic protective sleeve 6 moves upward relative to the valve stem 3 and moves from the second position to the first position. Figure 6 and Figure 7 As shown, at this time, the valve stem 3 and the elastic protective sleeve 6 form a stopper match. As the valve stem 3 continues to move downward, the valve stem 3 simultaneously drives the elastic protective sleeve 6 to move downward. Figure 2 and Figure 3 As shown, until the valve core 4 contacts the valve seat 102 again, the flow channel 1021 is cut off.

[0032] Optionally, a distance mark may be made on the valve stem 3 to clearly indicate the position of the valve stem 3 when it is pulled upward.

[0033] Optionally, a drive cylinder may be provided, and the output shaft of the drive cylinder is fixedly provided at the top of the valve stem 3. In this way, the position of the valve stem 3 can be switched by electric control, thereby switching the state of the high flow regulating needle valve.

[0034] It can be understood that the driving cylinder can be configured as any one of a hydraulic cylinder, a pneumatic cylinder or an electric cylinder.

[0035] In some embodiments, a first annular protrusion 1022 is provided in the valve seat 102; a second annular protrusion 6011 is provided on the elastic protective sleeve 6, and the second annular protrusion 6011 and the first annular protrusion 1022 have an overlapping area in the extension direction of the valve stem 3 to form a stop fit; a third annular protrusion 301 is provided on the valve stem 3, and the third annular protrusion 301 and the second annular protrusion 6011 have an overlapping area in the extension direction of the valve stem 3 to form a stop fit; a sliding groove is provided on the valve stem 3, and the sliding groove extends along the extension direction of the valve stem 3, and one end extends to the third annular protrusion 301, and the other end extends to the position where the elastic protective sleeve 6 can just completely wrap the valve core 4, a sliding block is provided on the inner circumferential wall of the elastic protective sleeve 6, and the sliding block is slidably inserted in the sliding groove, or a sliding groove is provided on the inner circumferential wall of the elastic protective sleeve 6, and a sliding block is provided on the valve stem 3.

[0036] Specifically in this embodiment, Figure 2 and Figure 3 As shown, the first annular protrusion 1022 is arranged on the inner side wall of the first mounting hole close to the flow channel 1021, and the second annular protrusion 6011 is arranged on the top peripheral wall of the elastic protective sleeve 6, and there is an overlap area between the first annular protrusion 1022 and the second annular protrusion 6011 in the vertical direction. In this way, when the elastic protective sleeve 6 moves upward following the valve stem 3, the first annular protrusion 1022 can block the second annular protrusion 6011, and then can block the elastic protective sleeve 6, so that the elastic protective sleeve 6 can generate relative movement with the valve stem 3, thereby facilitating the switching of the position of the elastic protective sleeve 6.

[0037] The third annular protrusion 301 is fixedly sleeved on the valve stem 3 and is arranged near the bottom end of the valve stem 3. The third annular protrusion 301 and the second annular protrusion 6011 have an overlapped area in the vertical direction. In this way, when the elastic protection sleeve 6 moves upward relative to the valve stem 3, the elastic protection has an upper limit position under the obstruction of the third annular protrusion 301, and the upper limit position is the first position; in order to avoid interference, the third annular protrusion 301 and the first annular protrusion 1022 do not have an overlapped area in the vertical direction, so that the valve stem 3 can freely move in the vertical direction relative to the valve seat 102.

[0038] The slide groove is formed on the side wall of the valve stem 3 and extends upward in the vertical direction to the third annular protrusion 301, and extends downward in the vertical direction to the position where the elastic protective sleeve 6 can just completely wrap the valve core 4. In this way, when the elastic protective sleeve 6 moves downward relative to the valve stem 3, the elastic protective sleeve has an extreme position of downward movement under the restriction of the bottom end of the slide groove, and the extreme position is the second position.

[0039] In order to improve the stability of the elastic protective sleeve 6 and the valve stem 3 during relative movement, optionally, a plurality of slide grooves can be provided and arranged circumferentially; the number of sliders is set to be equal to the number of slide grooves, and are correspondingly inserted into the slide grooves.

[0040] Initially, if Figure 2 and Figure 3 As shown, the high flow regulating needle valve is in a closed state, at which time the elastic protective sleeve 6 is in the first position, and the valve core 4 and the valve seat 102 are in close contact to completely cut off the flow channel 1021.

[0041] When it is necessary to adjust the high-flow regulating needle valve from a closed state to an open state, the valve stem 3 is first driven to move upward, and the valve stem 3 simultaneously drives the adjusting sleeve 2, the valve core 4 and the elastic protective sleeve 6 to move upward, and the distance between the adjusting sleeve 2 and the valve cap 101 becomes shorter, so that the elastic member is compressed; when the valve stem 3 moves to the first annular protrusion 1022 and the second annular protrusion 6011 to form a stop fit, as the valve stem 3 continues to move upward, under the obstruction of the first annular protrusion 1022, the elastic protective sleeve 6 moves downward relative to the valve stem 3 and moves from the first position to the second position. When the elastic protective sleeve 6 moves to the second position, the elastic protective sleeve 6 wraps the valve core 4. At this time, due to the relative movement between the valve core 4 and the elastic protective sleeve 6, under the elastic contraction of the elastic protective sleeve 6, the elastic protective sleeve 6 can effectively clean up foreign matter such as impurities and particles that may exist on the surface of the valve core 4, so as to prevent these foreign matters from affecting the sealing performance when the valve core 4 and the valve seat 102 cooperate again.

[0042] Then, the valve stem 3 is loosened. Under the action of the elastic member, the adjusting sleeve 2 synchronously drives the valve stem 3 to move downward through the threaded cooperation with the valve stem 3. The valve stem 3 synchronously drives the valve core 4 and the elastic protective sleeve 6 to move downward. Figure 4 and Figure 5 As shown, until the elastic protective sleeve 6 contacts the valve seat 102; then the valve stem 3 is rotated, and the valve stem 3 synchronously drives the valve core 4 and the elastic protective sleeve 6 to move upward while rotating through the threaded fit between the valve stem 3 and the adjusting sleeve 2 to open the flow channel 1021. During the rotation of the valve stem 3, due to the relative movement between the elastic protective sleeve 6 and the valve seat 102, the elastic protective sleeve 6 can effectively clean the impurities, particles and other foreign matter that may exist on the surface of the valve seat 102, so as to prevent these foreign matter from affecting the sealing performance when the valve seat 102 and the valve core 4 are matched again. When the fluid flows in the flow channel 1021, since the elastic protective sleeve 6 wraps the valve core 4, it can prevent the fluid from directly impacting the surface of the valve core 4, while protecting the integrity of the surface of the valve core 4, it ensures that the sealing performance of the valve core 4 and the valve seat 102 are not affected when they contact again, thereby ensuring the stability and reliability of the high-flow regulating needle valve during long-term use, and improving the performance of the high-flow regulating needle valve.

[0043] When it is necessary to adjust the high-flow regulating needle valve from the open state to the closed state, the valve stem 3 is first driven to move upward, and the valve stem 3 simultaneously drives the adjusting sleeve 2, the valve core 4 and the elastic protective sleeve 6 to move upward, and the distance between the adjusting sleeve 2 and the valve cap 101 becomes shorter, compressing the elastic part; to avoid affecting the resetting of the elastic protective sleeve 6, the second annular protrusion 6011 can be set to be made of an elastic material, such as rubber; when the valve stem 3 moves to the first annular protrusion 1022 and the second annular protrusion 6011 to form a stop fit, since the slider is located at the bottom end of the slide groove, the elastic protective sleeve 6 cannot move downward relative to the valve stem 3. At this time, as the valve stem 3 continues to move upward, under the extrusion of the first annular protrusion 1022, the second annular protrusion 6011 undergoes elastic deformation, and synchronously follows the valve stem 3 to move upward to pass over the first annular protrusion 1022.

[0044] When the second annular protrusion 6011 passes over the first annular protrusion 1022, the valve stem 3 is released. Under the action of the elastic member, the adjusting sleeve 2 synchronously drives the valve stem 3 to move downward through the threaded cooperation with the valve stem 3, and the valve stem 3 synchronously drives the valve core 4 and the elastic protective sleeve 6 to move downward. Figure 6 and Figure 7 As shown, until the first annular protrusion 1022 and the second annular protrusion 6011 form a stop fit; when the valve stem 3 moves to the point where the first annular protrusion 1022 and the second annular protrusion 6011 form a stop fit, at this time, under the obstruction of the first annular protrusion 1022, the elastic protective sleeve 6 first moves upward relative to the valve stem 3, and moves from the second position to the first position; when the elastic protective sleeve 6 is in the first position, the second annular protrusion 6011 simultaneously forms a stop fit with the third annular protrusion 301, at this time, under the action of the elastic member, the valve stem 3 continues to move downward, and under the extrusion of the first annular protrusion 1022, the second annular protrusion 6011 undergoes elastic deformation, and synchronously moves downward with the valve stem 3, as shown in FIG. Figure 2 and Figure 3 As shown, until the valve core 4 contacts the valve seat 102 again, the flow channel 1021 is cut off.

[0045] By repeating the above process, the switch state of the high flow regulating needle valve can be adjusted.

[0046] Optionally, a distance mark may be made on the valve stem 3 to clearly indicate the position of the valve stem 3 when it is pulled upward.

[0047] Optionally, a drive cylinder may be provided, and the output shaft of the drive cylinder is fixedly provided at the top of the valve stem 3. In this way, the position of the valve stem 3 can be switched by electric control, thereby switching the state of the high flow regulating needle valve.

[0048] It can be understood that the driving cylinder can be configured as any one of a hydraulic cylinder, a pneumatic cylinder or an electric cylinder.

[0049] In a further embodiment, in order to reduce the resistance encountered when the second annular protrusion 6011 is deformed and improve the smoothness of the movement of the valve stem 3, as shown in FIG. Figure 3 As shown, the inner peripheral wall of the first annular protrusion 1022 is set as a conical surface with the small end at the top, and the outer peripheral wall of the second annular protrusion 6011 is set as a conical surface with the small end at the top. In this way, when the second annular protrusion 6011 and the first annular protrusion 1022 form a stopper fit, the conical surface of the first annular protrusion 1022 abuts against the conical surface of the second annular protrusion 6011. At this time, the conical surface of the first annular protrusion 1022 has an upward guiding effect, so that the second annular protrusion 6011 can more easily pass over the first annular protrusion 1022.

[0050] In other embodiments, the elastic protective sleeve 6 is configured to include an outer layer 601 and an inner layer 602 that are sleeved together, and the outer layer 601 is an elastic sleeve-shaped structure, and the outer layer 601 is sleeved on the inner layer 602; the inner layer 602 is a plastic structure and is configured to support the outer layer 601.

[0051] Specifically in this embodiment, the outer layer 601 can be set to be made of rubber material; the inner layer 602 can be set to be composed of two parts, and the first part is an annular structure and is arranged on the upper side, and the second part is set to multiple strip structures, and the multiple strip structures are arranged along the circumferential direction, and the top of the strip structure is vertically arranged at the bottom of the first part, and the bottom end is suspended. The second part can be set to be made of plastic material, such as iron, copper, etc., so as to support the outer layer 601; the slider is arranged on the inner wall of the second part during installation.

[0052] Optionally, the second annular protrusion 6011 may be configured to be integrally formed with the outer layer 601 to ensure structural strength.

[0053] In other embodiments, the high flow regulating needle valve is configured to further include an anti-excessive deformation component, which is configured to reduce the force of the elastic member on the elastic protective sleeve 6. Figure 5 As shown, when the elastic protective sleeve 6 is in the second position and contacts the valve seat 102, the force of the elastic member on the adjusting sleeve 2 will be transmitted to the valve seat 102 through the valve stem 3, the valve core 4 and the elastic protective sleeve 6 in sequence. Under the action of the anti-excessive deformation component, the force of the elastic member on the elastic protective sleeve 6 will be reduced. According to the principle of action and reaction force, the thrust of the valve seat 102 on the elastic protective sleeve 6 will be reduced, so that the extrusion force on the elastic protective sleeve 6 can be reduced, thereby effectively avoiding excessive deformation of the elastic protective sleeve 6.

[0054] Furthermore, the anti-excessive deformation component is configured to include a plurality of spacers 701 and a plurality of guide strips 702. The plurality of spacers 701 are arranged circumferentially on the inner circumferential wall of the valve bonnet 101. A channel 7011 is formed between adjacent spacers 701. The spacers 701 extend along the axial direction of the valve bonnet 101. The plurality of guide strips 702 are arranged circumferentially on the outer circumferential wall of the adjustment sleeve 2 and are respectively arranged corresponding to the channels 7011. Each guide strip 702 has a fixed section 7021 and an elastic section 7022. The elastic section 7022 is inclined and can be elastically deformed under the push of the spacer strip 701.

[0055] Specifically in this embodiment, in order to ensure the rationality of the structure, a plurality of spacers 701 are evenly arranged along the circumference to form the same channel 7011; a plurality of guide bars 702 are evenly arranged along the circumference to correspond to the channel 7011. Fig.10 As shown, the guide bar 702 forms a "J"-shaped structure, and the fixed section 7021 is fixedly arranged on the adjustment sleeve 2, the top end of the elastic section 7022 is arranged below the fixed section 7021, and the bottom end is suspended to facilitate cooperation with the partition bar 701.

[0056] Exemplarily, the number of the partition bars 701 may be twenty to form twenty channels 7011 ; correspondingly, the number of the guide bars 702 may be twenty and they are arranged corresponding to the channels 7011 .

[0057] Initially, the high flow regulating needle valve is in a closed state, the guide strip 702 is inserted into the channel 7011 , and under the push of the spacer strip 701 , the elastic section 7022 tends to be arranged in line with the fixed section 7021 .

[0058] When it is necessary to adjust the high-flow regulating needle valve from a closed state to an open state, the valve stem 3 is first driven to move upward, and the valve stem 3 simultaneously drives the adjusting sleeve 2 to move upward, and the adjusting sleeve 2 simultaneously drives the guide bar 702 to move upward along the channel 7011. When the guide bar 702 is separated from the channel 7011, the elastic section 7022 automatically resets under the action of its own elasticity and tends to be tilted. At this time, the end of the elastic section 7022 away from the fixed section 7021 is located directly above the adjacent channel 7011, and the elastic protective sleeve 6 moves from the first position to the second position.

[0059] Then, the valve stem 3 is loosened. Under the action of the elastic member, the adjusting sleeve 2 synchronously drives the valve stem 3 to move downward through the threaded cooperation with the valve stem 3. The valve stem 3 synchronously drives the adjusting sleeve 2 to move downward. The adjusting sleeve 2 synchronously drives the guide strip 702 to move downward. Since the end of the elastic section 7022 away from the fixed section 7021 is located directly above the adjacent channel 7011, as the valve stem 3 moves, the guide strip 702 is inserted between the adjacent channels 7011 and moves downward. At this time, under the push of the partition strip 701 corresponding to the channel 7011, the elastic section 7022 undergoes elastic deformation while driving the adjusting sleeve 2 to rotate around its own axis. At this time, the adjusting sleeve 2 and the valve stem are in a state of rotation. 3, the adjusting sleeve 2 moves downward relative to the valve stem 3 to release part of the elastic force of the elastic member, and then the guide strip 702 is inserted into the channel 7011, and the elastic section 7022 tends to be arranged in line with the fixed section 7021 under the push of the spacer strip 701; when the elastic protective sleeve 6 and the valve seat 102 are in contact, part of the elastic force of the elastic member is released, thereby reducing the force acting on the elastic protective sleeve 6. According to the principle of action and reaction force, the push force of the valve seat 102 on the elastic protective sleeve 6 will be reduced, so that the extrusion force on the elastic protective sleeve 6 can be reduced, thereby effectively avoiding excessive deformation of the elastic protective sleeve 6.

[0060] When the high-flow regulating needle valve is in the closed state again, it only drives the valve stem 3 to rotate around its own axis. Under the threaded cooperation of the adjusting sleeve 2 and the valve stem 3, the adjusting sleeve 2 moves upward relative to the valve stem 3, compressing the elastic part, so that the force transmitted by the elastic part to the valve seat 102 through the adjusting sleeve 2 and the valve core 4 increases. According to the principle of action and reaction force, the force of the valve seat 102 on the valve core 4 will increase, thereby ensuring the sealing between the valve core 4 and the valve seat 102.

[0061] In other embodiments, in order to reduce materials and manufacturing costs, such as Figure 8 As shown, each partition bar 701 can be replaced by two partition bars 7012 arranged at intervals along the circumferential direction. The volume of the two partition bars 7012 is smaller than the volume of the partition bar 701, thereby reducing the material consumption.

[0062] In other embodiments, in order to improve the sealing performance between the valve core 4 and the valve seat 102 when the high flow regulating needle valve is in a closed state, the high flow regulating needle valve is configured to further include an elastic sealing ring 8, which is sleeved on the elastic protective sleeve 6 and is located at one end of the elastic protective sleeve 6 close to the valve core 4, and the elastic sealing ring 8 is configured to be able to seal the valve stem 3 and the valve seat 102. Figure 3 As shown, double sealing can be achieved under the combined effect of the contact between the elastic sealing ring 8 and the valve core 4 and the valve seat 102 .

[0063] In a further embodiment, the elastic sealing ring 8 may be disposed at the bottom of the outer layer 601 .

[0064] In other embodiments, the elastic member may also be configured as a compression spring 5 .

[0065] Specifically in this embodiment, Figure 2 As shown, the top end of the compression spring 5 is arranged on the inner top wall of the valve cap 101, and the bottom end is arranged on the top end surface of the adjusting sleeve 2. Under the action of the compression spring 5, the adjusting sleeve 2 has a tendency to move downward. The adjusting sleeve 2 has a tendency to drive the valve stem 3 and the valve core 4 to move downward through the threaded cooperation with the valve stem 3, so that the valve core 4 has a tendency to block the flow channel 1021, thereby ensuring the sealing between the valve core 4 and the valve seat 102 when the high-flow regulating needle valve is in a closed state.

[0066] In a further embodiment, Figure 2 As shown, the compression spring 5 and the adjustment sleeve 2 are coaxially arranged. In this way, the elastic force generated by the compression spring 5 can act evenly on various parts of the adjustment sleeve 2, thereby avoiding the deviation or jamming of the adjustment sleeve 2 during movement due to uneven force, on the one hand, avoiding affecting the coordinated movement accuracy of the valve stem 3, the valve core 4 and the elastic protective sleeve 6, and thus avoiding negative impact on the flow regulation accuracy of the high-flow regulating needle valve; on the other hand, avoiding aggravating the friction between the adjustment sleeve 2 and other components, causing excessive wear of the components, and shortening the service life of the high-flow regulating needle valve.

[0067] In other embodiments, in order to improve the sealing performance of the high flow regulating needle valve, the high flow regulating needle valve is configured to further include a first sealing member, which is configured to seal the regulating sleeve 2 , the valve stem 3 and the valve seat 102 .

[0068] Specifically in this embodiment, the first sealing member can be set as a first sealing ring 9, such as Figure 2 As shown, the first sealing ring 9 is inserted into the first mounting hole and is located below the adjusting sleeve 2 , and is simultaneously sealingly sleeved on the valve stem 3 .

[0069] More specifically, in order to facilitate supporting the first sealing ring 9 , a terrace-like structure is formed on the side wall of the first mounting hole.

[0070] Optionally, a plurality of first sealing rings 9 may be provided to improve the sealing performance.

[0071] Exemplarily, the number of first sealing rings 9 may be four, and they are stacked in a vertical direction.

[0072] Optionally, the first sealing ring 9 may be made of any one of nitrile rubber, fluororubber or polytetrafluoroethylene.

[0073] In other embodiments, in order to improve the convenience of disassembly and maintenance, it is set that a threaded fit is formed between the valve bonnet 101 and the valve seat 102. In this way, when parts need to be replaced, the valve bonnet 101 can be unscrewed from the valve seat 102, and then the valve bonnet 101, the elastic member, the adjustment sleeve 2, the valve stem 3, the valve core 4, and the elastic protective sleeve 6 can be removed from the valve seat 102, so that the valve core 4 and the elastic protective sleeve 6 can be replaced separately, or the valve bonnet 101, the adjustment sleeve 2, the valve stem 3, the valve core 4, and the elastic protective sleeve 6 can be replaced as a whole.

[0074] Specifically in the embodiment, Figure 2 As shown, the valve cap 101 can be configured to be threadedly inserted on the valve seat 102 .

[0075] In other embodiments, in order to improve the sealing performance of the high flow regulating needle valve, the high flow regulating needle valve is configured to further include a second sealing member, which is configured to seal the valve cap 101 , the valve seat 102 and the regulating sleeve 2 .

[0076] Specifically in this embodiment, the second sealing member can be set as a second sealing ring 10, such as Figure 2 As shown, the second sealing ring 10 is inserted into the first mounting hole and is located below the valve cap 101 , and is simultaneously sealingly sleeved on the adjustment sleeve 2 .

[0077] More specifically, in order to facilitate supporting the second sealing ring 10 , a terrace structure is formed on the side wall of the first mounting hole.

[0078] Optionally, a plurality of second sealing rings 10 may be provided to improve the sealing performance.

[0079] Exemplarily, the number of the second sealing rings 10 may be three, and they are stacked in a vertical direction.

[0080] Optionally, the second sealing ring 10 may be made of any one of nitrile rubber, fluororubber or polytetrafluoroethylene.

[0081] In other embodiments, in order to improve the convenience of manual operation, the high-flow regulating needle valve further includes a hand lever 11 , which is disposed on the valve stem 3 and located outside the valve seat 102 .

[0082] Specifically in this embodiment, Figure 2 As shown, the hand lever 11 is arranged horizontally when in use to facilitate manual operation; and the hand lever 11 and the valve stem 3 can be arranged to be detachably connected to facilitate replacement of parts.

[0083] Specifically, an L-shaped second mounting hole is opened inside the hand lever 11, and the top end of the valve stem 3 is inserted into the vertical section of the second mounting hole during installation. A slot is opened on the side wall of the top rod of the valve stem 3, and the high-flow regulating needle valve is configured to also include a locking pin 12. The locking pin 12 is inserted into the horizontal section of the second mounting hole during installation and is simultaneously inserted into the slot to connect the hand lever 11 to the valve stem 3.

[0084] In other embodiments, the valve core 4 may be configured as a conical structure to further improve the sealing performance when the valve core 4 and the valve seat 102 are in contact.

[0085] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high flow regulating needle valve, characterized in that: The high flow regulating needle valve comprises: A needle valve body, the needle valve body comprising a valve cap and a valve seat, wherein a flow channel for fluid flow is formed in the valve seat; An adjusting sleeve is inserted into the needle valve body and can slide along its own axis direction; The valve stem is threadedly inserted into the adjusting sleeve and can rotate around its own axis and slide along its own axis; a valve core, disposed on the valve stem and configured to be able to separate from or contact the valve seat to change the degree of opening of the flow channel; An elastic member, disposed between the valve cap and the adjusting sleeve, wherein the valve core has a tendency to block the flow channel under the action of the elastic member; An elastic protective sleeve is sleeved on the valve stem and can respectively form a stop fit with the valve stem and the valve seat. The elastic protective sleeve can slide along its own axial direction relative to the valve stem and has a corresponding first position and second position before and after sliding. The first position is farther away from the valve core than the second position. When in the second position, the elastic protective sleeve wraps around the valve core.

2. The high flow regulating needle valve according to claim 1, characterized in that: A first annular bulge is arranged in the valve seat; a second annular bulge is arranged on the elastic protective sleeve, and the second annular bulge and the first annular bulge have an overlapping area in the extension direction of the valve stem to form a stop fit; a third annular bulge is arranged on the valve stem, and the third annular bulge and the second annular bulge have an overlapping area in the extension direction of the valve stem to form a stop fit; a sliding groove is arranged on the valve stem, and the sliding groove extends along the extension direction of the valve stem, and one end extends to the third annular bulge, and the other end extends to the position where the elastic protective sleeve can just completely wrap the valve core, a sliding block is arranged on the inner circumferential wall of the elastic protective sleeve, and the sliding block is slidably inserted in the sliding groove, or a sliding groove is arranged on the inner circumferential wall of the elastic protective sleeve, and a sliding block is arranged on the valve stem.

3. The high flow regulating needle valve according to claim 1, characterized in that: The elastic protective sleeve comprises an outer layer and an inner layer which are sleeved together, wherein the outer layer is an elastic sleeve-shaped structure and is sleeved on the inner layer; the inner layer is a plastic structure and is configured to support the outer layer.

4. The high flow regulating needle valve according to claim 1, characterized in that: The high flow regulating needle valve further includes an over-deformation prevention component, which is configured to reduce the force exerted by the elastic member on the elastic protective sleeve.

5. The high flow regulating needle valve according to claim 4, characterized in that: The anti-excessive deformation component includes a plurality of spacers and a plurality of guide strips, wherein the plurality of spacers are arranged circumferentially on the inner circumferential wall of the valve bonnet, and channels are formed between adjacent spacers, and the spacers extend along the axial direction of the valve bonnet; the plurality of guide strips are arranged circumferentially on the outer circumferential wall of the adjustment sleeve, and are respectively arranged corresponding to the channels, and each guide strip has a fixed section and an elastic section, the elastic section is arranged at an angle, and can be elastically deformed under the pushing of the spacers.

6. The high flow regulating needle valve according to claim 1, characterized in that: The high flow regulating needle valve also includes an elastic sealing ring, which is sleeved on the elastic protective sleeve and located at one end of the elastic protective sleeve close to the valve core. The elastic sealing ring is configured to seal the valve stem and the valve seat.

7. The high flow regulating needle valve according to claim 1, characterized in that: The high flow regulating needle valve further includes a first sealing member configured to seal the regulating sleeve, the valve stem and the valve seat.

8. The high flow regulating needle valve according to claim 1, characterized in that: The valve cap and the valve seat are threadedly matched.

9. The high flow regulating needle valve according to claim 1, characterized in that: The high flow regulating needle valve further includes a second sealing member configured to seal the valve cap, the valve seat and the regulating sleeve.

10. The high flow regulating needle valve according to claim 1, characterized in that: The high flow regulating needle valve further comprises a hand lever, which is arranged on the valve stem and located outside the valve seat.

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