Control valve

Abstract

The utility model discloses a control valve, which comprises a valve body, a valve core, a valve core and a valve core, the inner sleeve is arranged in the valve cavity and connected with the inner wall of the valve cavity in a sealed mode, an inner cavity of the inner sleeve is divided into an inflow channel, a connecting channel and a plurality of axial throttling channels from top to bottom, the inflow channel, the connecting channel and the axial throttling channels are communicated with one another, and each axial throttling channel is formed by arranging a plurality of rotational flow grooves with the same inclined direction around the inner cavity wall of the inner sleeve by a circle. The oblique directions of the rotational flow grooves in the adjacent axial throttling channels are opposite; the outer sleeves are sequentially and coaxially arranged on the inner sleeve in a sleeving mode from inside to outside, radial throttling channels with the number gradually increased upwards are arranged between the outer sleeve on the outermost side and the inner sleeve on the innermost side in the radial direction in a penetrating mode, and the multiple stages of radial throttling channels are communicated with the inflow channel; the sealing section of the plunger component is in sealing sliding fit with the inflow channel, and the throttling section of the plunger component penetrates through the connecting channel and extends to the axial throttling channel at the lowermost end. The control valve adopting the structure meets the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically to a control valve. Background Art

[0002] With the continuous development of modern industrial automation, control valves need to meet the requirements of extremely complex working conditions such as high pressure difference and large adjustable ratio. Among them, the adjustable ratio refers to the ratio between the maximum flow rate and the minimum flow rate that can be adjusted.

[0003] At present, the widely used control valve throttling elements are mainly plunger type, sleeve type and labyrinth type. Among them, labyrinth type and multi-stage sleeve type throttling elements can consume medium energy to achieve pressure reduction and small flow rate, but the above two throttling elements have intermittent dead zones in flow control, resulting in discontinuous flow regulation, especially under small flow conditions, which are basically impossible to adjust. The small flow has poor adjustability, resulting in low flow adjustable ratio, which cannot meet the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio. In addition, plunger type throttling elements are difficult to control the sealing and leakage level, and cannot achieve small flow control. The flow adjustment range is limited, that is, the flow adjustable ratio is low, and it cannot meet the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio. Therefore, the current control valve cannot achieve continuous throttling without dead zones, that is, it cannot achieve continuous and uninterrupted control and adjustment of small flows, and thus cannot meet the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

[0004] In summary, how to provide a control valve that can meet the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a control valve that meets the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A control valve, comprising:

[0008] A valve body, wherein a valve cavity is provided inside, and a medium inlet and a medium outlet arranged below the medium inlet are arranged on the side wall of the valve body;

[0009] An inner sleeve is arranged in the valve cavity and sealedly connected to the inner wall thereof, the inner cavity of the inner sleeve is divided from top to bottom into an inflow channel, a connecting channel and a plurality of axial throttling channels which are interconnected, an annular protrusion is provided at the connection point between the connecting channel and the axial throttling channel at the uppermost end, the axial throttling channel is formed by a plurality of swirl grooves with the same oblique direction arranged around the inner cavity wall of the inner sleeve, and the swirl grooves in adjacent axial throttling channels are obliquely opposite, and the axial throttling channel at the lowermost end is connected to the medium outlet;

[0010] A plurality of outer sleeves are coaxially sleeved on the inner sleeve in sequence from the inside to the outside, and radial throttling channels whose number increases step by step upward are radially penetrated between the outermost outer sleeve and the innermost inner sleeve, and the medium inlet is connected to the inlet channel through the multiple-stage radial throttling channels;

[0011] The plunger component can be moved up and down and inserted into the inner cavity of the inner sleeve, and the sealing section of the plunger component is in sealing and sliding cooperation with the inflow channel, and the throttling section passes through the connecting channel and extends to the lowermost axial throttling channel. A valve flap is provided on the throttling section and located in the connecting channel. When the valve flap is in sealing contact with the annular protrusion, the sealing section blocks the multiple levels of radial throttling channels and the connecting channel.

[0012] Preferably, on the same radial throttling surface, the walls of the outer sleeve and the inner sleeve from the outside to the inside are provided with a plurality of through holes whose number increases step by step along the axial direction upward, and the two adjacent outer sleeves and the plurality of through holes on the same radial throttling surface are staggered and connected to form a folded radial throttling channel.

[0013] Preferably, the inner sleeve and the outer sleeve on the same radial throttling surface have a plurality of through holes distributed at equal intervals around the axial circle, and the number of the through holes increases in an equal percentage with the lift of the plunger member in the axially upward direction.

[0014] Preferably, the outer diameter of the valve flap gradually increases from top to bottom, and the maximum outer diameter of the valve flap is smaller than the diameter of the connecting channel and larger than the inner diameter of the annular protrusion.

[0015] Preferably, the throttling section located in the axial throttling channel is provided with edges which are all trumpet-shaped with the large diameter end facing downward, and the maximum diameter of the edges is smaller than the diameter of the axial throttling channel.

[0016] Preferably, the throttling section is a split structure, which is divided into an opening and closing rod and a plurality of throttling rods from top to bottom. The top end of the opening and closing rod is connected to the sealing section, and the valve flap is arranged at the bottom end. The valve flap is detachably connected to the top end of the uppermost throttling rod, and the top ends of the remaining throttling rods are detachably connected to the bottom ends of the throttling rods adjacent thereto, and the edge is arranged at the bottom end of each throttling rod.

[0017] Preferably, a plurality of swirl grooves are circumferentially arranged at equal intervals on the inner cavity wall of the inner sleeve, and all extend a certain distance along the axial direction of the inner sleeve and are arranged at a certain inclination angle to the axial direction of the inner sleeve to form the axial throttling channel.

[0018] Preferably, it also includes a valve cover, which is sealed and fixed to the top end of the inner sleeve, and the valve body is provided with an annular groove on the inner wall between the medium outlet and the medium outlet, and an annular protrusion is provided on the outer wall of the inner sleeve, and the annular protrusion is sealed and abutted against the annular groove.

[0019] Preferably, it also includes a valve stem and a driving mechanism, wherein the top end of the valve stem is connected to the driving mechanism, and the bottom end of the valve stem penetrates the valve cover and is coaxially connected to the plunger member.

[0020] Preferably, it further comprises a control unit, and the control unit is connected to the driving mechanism via electrical signals.

[0021] Compared with the above-mentioned background technology, in the present application, compared with the conventional control valve, a plurality of outer sleeves are sequentially sleeved on the inner sleeve from the inside to the outside, and radial throttling channels whose number increases step by step upward are radially arranged from the outermost outer sleeve to the innermost inner sleeve to form a multi-stage radial throttling channel. As the valve position is lowered, that is, the plunger member moves downward, the sealing section opens each stage of the radial throttling channel in sequence from top to bottom, and the number of radial throttling channels decreases step by step. Correspondingly, the medium flow rate flowing from the medium inlet into the inner cavity of the inner sleeve decreases step by step. It should be noted that the number of radial throttling channels The smaller the flow resistance, the greater the kinetic energy loss of the medium. That is to say, when the valve is in a low valve position, the radial throttling channel is the least and the valve group ratio is the largest, thereby achieving resistance to high pressure difference and small flow regulation. In addition, the valve disc is in seal contact with the annular protrusion, which can prevent the medium from flowing out through the radial throttling channel, the inflow channel, the connecting channel and the axial throttling channel in sequence, so as to form a sealing characteristic with zero leakage. In this way, the small flow rate of the medium can be reduced by controlling the downward movement of the plunger component. When the valve disc is in seal contact with the annular protrusion, it is adjusted to the minimum flow rate, thereby increasing the flow regulation range to meet the requirements of high pressure difference and large adjustable ratio working conditions.

[0022] On the basis of the above-mentioned radial throttling of the medium, continuous and uninterrupted axial throttling of the medium is further achieved. Specifically, since the axial throttling channels are formed by a plurality of swirl grooves with the same oblique direction arranged around the inner cavity wall of the inner sleeve, the friction of the medium is hindered to form a vortex after it flows into the axial throttling channel, and since the swirl grooves in adjacent axial throttling channels are in opposite directions, the medium continuously and alternately forms positive vortices and reverse vortices in the process of flowing downward into a plurality of axial throttling channels in sequence through the connecting channel, so as to generate huge resistance and consume the kinetic energy of the medium again, thereby achieving continuous and uninterrupted controllable and adjustable resistance to different high pressure differences and small flow rates, achieving the standard continuous flow characteristic curve of the control valve, further achieving the downward adjustment of the small flow rate of the medium, and having good adjustability of the small flow rate, which greatly improves the flow adjustment range, that is, greatly improves the adjustable ratio of the medium flow rate, thereby meeting the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the control valve provided in this application;

[0025] Figure 2 An assembly diagram of the multi-stage sleeve radial throttling element and the plunger axial throttling element provided in this application;

[0026] Figure 3 for Figure 2 Sectional view at II in the middle;

[0027] Figure 4 for Figure 2 Sectional view at II-II in the middle;

[0028] Figure 5 A schematic diagram of the structure of the inner sleeve provided in this application;

[0029] Figure 6 A schematic diagram of the plunger member provided in this application being located at the lowest valve position (adjusted to the minimum flow);

[0030] Figure 7 A schematic diagram of the sealing state between the valve disc and the annular protrusion provided in this application;

[0031] Figure 8 A schematic diagram of different radial throttling surfaces of the inner sleeve and the outer sleeve provided in the present application;

[0032] Fig. 9 This is a schematic diagram showing that the number of through holes on the inner sleeve and the outer sleeve on the multi-stage radial throttling surface from bottom to top increases step by step provided in the present application.

[0033] Figure 1-9 middle:

[0034] 1 is a valve body, 2 is a valve cover, 3 is a valve stem, 4 is a driving mechanism, 5 is an inner sleeve, 6 is an outer sleeve, and 7 is a plunger member;

[0035] 11 is the medium inlet, 12 is the medium outlet;

[0036] 51 is an inflow channel, 52 is a connecting channel, 53 is an axial throttling channel, 53-1 is a swirl groove, and 54 is an annular protrusion;

[0037] 61 is a radial throttling channel, and 61-1 is a through hole;

[0038] 71 is a sealing section, 72 is a throttling section, 72-1 is an opening and closing rod, 72-2 is a throttling rod, 73 is a valve disc, and 74 is an edge. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] The core of the utility model is to provide a control valve that meets the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

[0041] It should be noted that in the present embodiment, the orientation or position relationship indicated by "upper", "lower", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 on the present application.

[0042] Please refer to Figures 1 to 9 The present application provides a control valve, including a valve body 1, an inner sleeve 5, a plurality of outer sleeves 6 and a plunger member 7.

[0043] A valve cavity is provided inside the valve body 1 , and a medium inlet 11 and a medium outlet 12 arranged below the medium inlet 11 are provided on the side wall of the valve body 1 .

[0044] The inner sleeve 5 is arranged in the valve cavity and is sealed and connected to the inner wall thereof. The inner cavity of the inner sleeve 5 is divided from top to bottom into an inflow channel 51, a connecting channel 52 and a plurality of axial throttling channels 53 which are interconnected. An annular protrusion 54 is provided at the connection point between the connecting channel 52 and the uppermost axial throttling channel 53. The axial throttling channel 53 is formed by a plurality of swirl grooves 53-1 with the same oblique direction arranged around the inner cavity wall of the inner sleeve 5, and the swirl grooves 53-1 in adjacent axial throttling channels 53 are obliquely opposite. The lowermost axial throttling channel 53 is connected to the medium outlet 12.

[0045] Several outer sleeves 6 are coaxially sleeved on the inner sleeve 5 from the inside to the outside in sequence. A radial throttling channel 61 whose number increases step by step upward is radially penetrated between the outermost outer sleeve 6 and the innermost inner sleeve 5. The medium inlet 11 is connected to the inflow channel 51 through the multi-stage radial throttling channel 61.

[0046] The plunger member 7 can be moved up and down and inserted into the inner cavity of the inner sleeve 5, and the sealing section 71 of the plunger member 7 is sealingly slidably matched with the inflow channel 51, and the throttling section 72 passes through the connecting channel 52 and extends to the lowermost axial throttling channel 53. A valve flap 73 is provided on the throttling section 72 and located in the connecting channel 52. When the valve flap 73 is sealingly abutted against the annular protrusion 54, the sealing section 71 blocks the multi-stage radial throttling channel 61 and the connecting channel 52.

[0047] For details, please refer to Figure 2 and Figure 5 , several outer sleeves 6 are axially sleeved with the inner sleeve 5 to form a multi-stage sleeve radial throttling element for realizing radial throttling of the medium, and a radial throttling channel 61 is radially arranged from the outermost outer sleeve 6 to the innermost inner sleeve 5, and the number of radial throttling channels 61 increases step by step along the axial direction to form a multi-stage radial throttling channel 61, each stage of the radial throttling channel 61 is connected to the inflow channel 51 in the inner sleeve 5, and the fewer the number of radial throttling channels 61, the more collisions between the medium and the cylinder wall, the greater the flow resistance, and the greater the kinetic energy loss of the medium. Optionally, several outer sleeves 6 are approximately at the same height as the inflow channel 51 in the inner sleeve 5 in the axial direction, so as to facilitate the medium to flow into the inner sleeve 5 through the medium inlet 11 and the radial throttling channel 61, and the number of the several outer sleeves 6 is not unique, and can be set according to actual needs.

[0048] The plunger member 7 acts as a plunger axial throttling element in the inner cavity of the inner sleeve 5. The sealing section 71 of the plunger member 7 slides and seals with the inflow channel 51 in the inner sleeve 5. In the initial valve position, that is, the control valve is closed and no medium flows out, the valve flap 73 seals and abuts against the annular protrusion 54, which can block the connecting channel 52 and the axial throttling channel 53, and prevent the medium from flowing out from the medium outlet 12 through the axial throttling channel 53. Since there is a small gap between the sealing section 71 and the inner wall of the inflow channel 51, when the valve flap 73 seals and abuts against the annular protrusion 54, the sealing section 71 shields the lowest first-stage radial throttling channel 61 to block the multi-stage radial throttling channel 61 and the connecting channel 52. Even if the medium flows into the connecting channel 52 through the first-stage radial throttling channel 61 through the small gap, the medium cannot flow out, and the minimum flow rate can be controlled within the range of 0.01% to 1%. The valve resistance ratio is the largest at a small flow rate, and the actual adjustable ratio is close to the ideal adjustable ratio. In this way, Figure 6 and 7As shown, as the valve position is lowered, that is, the plunger member 7 moves downward, the sealing section 71 opens each level of radial throttling channel 61 in sequence from top to bottom, the number of radial throttling channels 61 decreases step by step, the kinetic energy loss of the medium increases step by step, and the medium flow rate flowing from the medium inlet 11 into the inner cavity of the inner sleeve 5 decreases step by step, so as to reduce the pressure of the medium high pressure difference in stages and sections, and at the same time, a small flow rate is adjusted downward until the valve disc 73 is sealed and abutted against the annular protrusion 54 and adjusted to the minimum flow rate. The flow rate adjustment range is large, that is, the medium flow rate is adjustable. Ratio is high, so as to be suitable for high pressure difference and large adjustable ratio working conditions.

[0049] The above-mentioned multi-stage sleeve radial throttling element is a graded and segmented radial throttling, and the medium flow regulation is discontinuous and discontinuous, which cannot meet the standard continuous flow characteristic curve of the control valve, and even cannot achieve the control valve small flow continuous uninterrupted controllable and adjustable. Figures 3 to 5 As shown, the inner sleeve 5 has a plurality of axial throttling channels 53 connected to the lower part of the connecting channel 52, each axial throttling channel 53 is formed by a plurality of swirl grooves 53-1 arranged around the inner cavity wall of the inner sleeve 5, and the plurality of swirl grooves 53-1 are inclined at the same angle relative to the axis of the inner sleeve 5, so that after the medium flows into each axial throttling channel 53, friction is blocked to form vortex, and the swirl grooves 53-1 in two adjacent axial throttling channels 53 are inclined in opposite directions, so that in the process of the medium flowing downward through the connecting channel 52 into the plurality of axial throttling channels 53 in sequence, positive vortex and reverse vortex are continuously and alternately formed to generate huge resistance and consume the kinetic energy of the medium again, thereby realizing continuous and uninterrupted controllable and adjustable resistance to different high pressure differences and small flow rates, achieving the standard continuous flow characteristic curve of the control valve, good adjustability of small flow rates, greatly improving the flow adjustment range, that is, greatly improving the adjustable ratio of the medium flow, thereby meeting the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

[0050] Considering the specific configuration of the radial throttling channel 61, based on the above embodiment, please refer to Figure 5 and Figure 8 On the same radial throttling surface, the walls of the outer sleeve 6 and the inner sleeve 5 from the outside to the inside are provided with a number of through holes 61-1 which increase step by step along the axial direction, and the two adjacent outer sleeves 6 on the same radial throttling surface and the several through holes 61-1 on the adjacent outer sleeves 6 and the inner sleeve 5 are staggered and connected to form a folding radial throttling channel 61.

[0051] Specifically, several outer sleeves 6 are coaxially sleeved with the inner sleeve 5, and the same radial throttling surface is formed by cutting from the outermost outer sleeve 6 to the innermost inner sleeve 5 along the direction perpendicular to the coaxial line. The wall of the inner sleeve 5 is provided with several through holes 61-1 around the axial circle, and the wall of the outer sleeve 6 located on the same radial throttling surface is also provided with several through holes 61-1 around the axial circle, and the two adjacent outer sleeves 6 on the same radial throttling surface and the several through holes 61-1 on the adjacent outer sleeves 6 and the inner sleeve 5 are staggered and connected to form a folding radial throttling channel 61. The folding radial throttling channel 61 has a large detour to form a large folding flow resistance, which can greatly consume the kinetic energy of the medium and resist huge high pressure difference, and is better suitable for high pressure difference and small flow conditions. It should be noted that the number of through holes 61 - 1 on the inner sleeve 5 and the outer sleeve 6 increases step by step in the axially upward direction, so that the number of turning radial throttling channels 61 in the multi-stage radial throttling channels 61 increases step by step from bottom to top, and the number of detours of the medium is reduced.

[0052] It should be noted that, for the control valve at different openings, the relative stroke and relative flow are not directly related. The flow change caused by a unit stroke change at each point in the stroke is proportional to the flow at this point. Therefore, the control valve is controlled according to the equal percentage flow curve. When the flow is small, the flow change is small, and when the flow is large, the flow change is large. At different openings, it has the same accuracy and strong adaptability.

[0053] In order to realize equal percentage flow curve control, on the basis of the above embodiment, the inner sleeve 5 and the outer sleeve 6 on the same radial throttling surface have a number of through holes 61-1 equally spaced around the axial circle, and the number of through holes 61-1 increases axially upward with the lift of the plunger member 7 by an equal percentage. In other words, before 50% of the upward movement of the plunger member 7, the increase in the number of radial throttling channels 61 in each level of radial throttling channels 61 from bottom to top is small, and after 50%, the increase in the number of radial throttling channels 61 in each level of radial throttling channels 61 from bottom to top is large, so as to meet the control requirements of the equal percentage flow curve, thereby better and more accurately controlling the control valve within a large flow adjustment range. Among them, the number of through holes 61-1 set in each level of radial throttling channels 61 from bottom to top, and in the inner sleeve 5 and the outer sleeve 6 on the same radial throttling surface, can be referred to. Figure 8 and Fig. 9 As shown, 10 levels of radial throttling surfaces are cut from the outermost outer sleeve 6 to the innermost inner sleeve 5 from bottom to top, correspondingly forming 10 levels of radial throttling channels 61. From bottom to top, the number of through holes 61-1 of the inner sleeve 5 and the outer sleeve 6 located on the same radial throttling surface in each level of radial throttling channel 61 increases step by step.

[0054] In order to further enhance the axial throttling effect, on the basis of the above embodiment, the outer diameter of the valve flap 73 gradually increases from top to bottom to increase the collision area between the medium and the valve flap 73, increase the kinetic energy consumption of the medium, and ensure that the medium flows downward smoothly, and the maximum outer diameter value of the valve flap 73 is smaller than the diameter of the connecting channel 52 to ensure that the medium can flow downward along the connecting channel 52 into the axial throttling channel 53, and the maximum outer diameter value of the valve flap 73 is larger than the inner diameter of the annular protrusion 54 to prevent the valve flap 73 from sliding into the axial throttling channel 53, thereby ensuring that the valve flap 73 plays a role in controlling the inflow and outflow of the medium, and at the same time ensuring that the medium flow rate can be adjusted down to the minimum flow rate, thereby ensuring that the control valve of the present application has a large adjustable ratio.

[0055] Optionally, an annular protrusion is also provided at the bottom connecting the connecting channel 52 and the inflow channel 51. Similarly, the maximum outer diameter of the valve flap 73 is greater than the inner diameter of the annular protrusion to prevent the valve flap 73 from sliding into the inflow channel 51 and affecting the downstream flow of the medium. The position of the valve flap 73 on the throttling section 72 located in the connecting channel 52 needs to be set according to the stroke of the plunger component 7.

[0056] In order to further enhance the axial throttling effect, on the basis of the above embodiment, the throttling section 72 located in the axial throttling channel 53 is provided with a trumpet-shaped edge 74 with the large diameter end facing downward, and the maximum diameter of the edge 74 is smaller than the diameter of the axial throttling channel 53, so as to increase the collision area between the medium and the valve disc 73, increase the kinetic energy consumption of the medium, and ensure that the medium flows smoothly downward.

[0057] Considering the specific structure of the plunger component 7, on the basis of the above embodiment, the throttling section 72 is a split structure, which is divided into an opening and closing rod 72-1 and a plurality of throttling rods 72-2 from top to bottom. The top of the opening and closing rod 72-1 is connected to the sealing section 71, and a valve flap 73 is provided at the bottom. The valve flap 73 is detachably connected to the top of the topmost throttling rod 72-2, and the tops of the remaining throttling rods 72-2 and the bottoms of the adjacent throttling rods 72-2 are detachably connected, and the bottoms of the throttling rods 72-2 are provided with edges 74. The plunger component 7 with the above structure is a detachable structure, which is convenient for processing the plunger component 7 and for disassembling and assembling the throttling rod 72-2, so as to adjust the plunger component 7 according to control valves with different specifications and different numbers of axial throttling channels 53.

[0058] Considering the specific structure of the axial throttling channel 53, on the basis of the above embodiment, a plurality of swirl grooves 53-1 are circumferentially arranged at equal intervals on the inner cavity wall of the inner sleeve 5, and all extend a certain distance along the axial direction of the inner sleeve 5 and are arranged at a certain inclination angle with the axial direction of the inner sleeve 5 to form the axial throttling channel 53. In this way, the plurality of swirl grooves 53-1 in the axial throttling channel 53 are arranged at equal intervals and at the same inclination angle, so that the medium flowing into the axial throttling channel 53 can be evenly frictionally blocked, and can better rotate continuously in the same vortex direction to form a vortex.

[0059] In order to stably and sealingly arrange the multi-stage sleeve radial element in the valve body 1, based on the above embodiment, the present application also includes a valve cover 2, which is sealed and fixed to the top of the inner sleeve 5. An annular groove is provided on the inner wall of the valve body 1 between the medium outlet 12 and the medium outlet 12, and an annular protrusion 54 is provided on the outer wall of the inner sleeve 5, and the annular protrusion 54 is sealingly abutted in the annular groove.

[0060] In addition, the present application also includes a valve stem 3 and a driving mechanism 4. The top end of the valve stem 3 is connected to the driving mechanism 4, and the bottom end passes through the valve cover 2 and is coaxially connected to the plunger component 7. The driving mechanism 4 is used to drive the valve stem 3 to move up and down to control the up and down movement of the plunger component 7, that is, to control the valve position of the control valve.

[0061] Preferably, the present application further comprises a control unit, which is connected to the driving mechanism via an electrical signal to achieve remote and precise automated control of the up and down movement of the plunger member 7, i.e., precise control of the valve position of the control valve.

[0062] In summary, this application has the following advantages:

[0063] (1) By using radial fold throttling and axial positive and negative staggered vortex throttling, the standard continuous flow characteristic curve of the control valve is achieved, the large and small flow control deviation index is reduced, and the control valve is prevented from producing a step-type non-smooth intermittent dead zone flow characteristic curve.

[0064] (2) By utilizing radial folding throttling and axial positive and negative staggered vortex throttling, the small flow rate has good adjustability, which greatly improves the medium flow rate adjustable ratio, thereby meeting the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

[0065] (3) The control valve has unique advantages in high strength, cavitation resistance, anti-flash and cavitation, and noise and vibration reduction.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The control valve provided by the utility model is introduced in detail above. The principle and implementation method of the utility model are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A control valve, characterized in that: include: A valve body (1) is provided with a valve cavity inside, and a medium inlet (11) and a medium outlet (12) arranged below the medium inlet are provided on the side wall of the valve body (1); An inner sleeve (5) is arranged in the valve cavity and sealedly connected to the inner wall thereof. The inner cavity of the inner sleeve (5) is divided from top to bottom into an inflow channel (51), a connecting channel (52) and a plurality of axial throttling channels (53) which are interconnected. An annular protrusion (54) is provided at the connection point between the connecting channel (52) and the uppermost axial throttling channel (53). The axial throttling channel (53) is formed by a plurality of swirl grooves (53-1) with the same oblique direction arranged around the inner cavity wall of the inner sleeve (5), and the swirl grooves (53-1) in adjacent axial throttling channels (53) are obliquely opposite. The lowermost axial throttling channel (53) is connected to the medium outlet (12). A plurality of outer sleeves (6) are coaxially sleeved on the inner sleeve (5) in sequence from the inside to the outside, and radial throttling channels (61) whose number increases step by step upward are radially penetrated between the outermost outer sleeve (6) and the innermost inner sleeve (5), and the medium inlet (11) is connected to the inlet channel (51) through the multiple stages of radial throttling channels (61); The plunger member (7) can be moved up and down and inserted into the inner cavity of the inner sleeve (5), and the sealing section (71) of the plunger member (7) is in sealing and sliding cooperation with the inflow channel (51), and the throttling section (72) passes through the connecting channel (52) and extends to the axial throttling channel (53) at the lower end. A valve flap (73) is provided on the throttling section (72) and located in the connecting channel (52). When the valve flap (73) is in sealing contact with the annular protrusion (54), the sealing section (71) blocks the multiple-stage radial throttling channels (61) and the connecting channel (52).

2. The control valve according to claim 1, characterized in that: On the same radial throttling surface, the outer sleeve (6) and the inner sleeve (5) are provided with a plurality of through holes (61-1) whose number increases step by step along the axial direction from the outside to the inside on the wall, and the two adjacent outer sleeves (6) and the plurality of through holes (61-1) on the adjacent outer sleeves (6) and the inner sleeves (5) on the same radial throttling surface are staggered and connected to form a folded radial throttling channel (61).

3. The control valve according to claim 2, characterized in that: The inner sleeve (5) and the outer sleeve (6) on the same radial throttling surface both have a plurality of through holes (61-1) distributed at equal intervals around the axial circle, and the number of the through holes (61-1) increases in the same percentage as the lift of the plunger member (7) in the axially upward direction.

4. The control valve according to claim 1, characterized in that: The outer diameter of the valve flap (73) gradually increases from top to bottom, and the maximum outer diameter of the valve flap (73) is smaller than the diameter of the connecting channel (52) and larger than the inner diameter of the annular protrusion (54).

5. The control valve according to claim 4, characterized in that: The throttling section (72) located in the axial throttling channel (53) is provided with an edge (74) which is trumpet-shaped and has a large diameter end facing downward, and the maximum diameter of the edge (74) is smaller than the diameter of the axial throttling channel (53).

6. The control valve according to claim 5, characterized in that The throttling section (72) is a split structure, which is divided into an opening and closing rod (72-1) and a plurality of throttling rods (72-2) from top to bottom. The top end of the opening and closing rod (72-1) is connected to the sealing section (71), and the valve flap (73) is arranged at the bottom end. The valve flap (73) is detachably connected to the top end of the throttling rod (72-2) at the top end, and the top ends of the remaining throttling rods (72-2) are detachably connected to the bottom ends of the throttling rods (72-2) adjacent thereto, and the edge (74) is arranged at the bottom end of each throttling rod (72-2).

7. The control valve according to claim 1, characterized in that: A plurality of swirl grooves (53-1) are circumferentially arranged at equal intervals on the inner cavity wall of the inner sleeve (5), and all extend a certain distance along the axial direction of the inner sleeve (5) and are arranged at a certain inclination angle with the axial direction of the inner sleeve (5) to form the axial throttling channel (53).

8. The control valve according to any one of claims 1 to 7, characterized in that: It also includes a valve cover (2), the valve cover (2) is sealed and fixed to the top end of the inner sleeve (5), the valve body (1) is provided with an annular groove on the inner wall between the medium outlet (12) and the medium outlet (12), and the inner sleeve (5) is provided with an annular protrusion (54) on the outer wall, and the annular protrusion (54) is sealingly abutted in the annular groove.

9. The control valve according to claim 8, characterized in that It also comprises a valve stem (3) and a driving mechanism, wherein the top end of the valve stem (3) is connected to the driving mechanism, and the bottom end thereof passes through the valve cover (2) and is coaxially connected to the plunger member (7).

10. The control valve according to claim 9, characterized in that It also includes a control unit, which is connected to the driving mechanism by electrical signals.

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