CN117905886A - Control valve - Google Patents

Abstract

The invention discloses a control valve, comprising: a valve body, the interior of which is provided with a valve cavity; the inner cavity of the inner sleeve is divided into an inflow channel, a connecting channel and a plurality of axial throttling channels which are mutually communicated from top to bottom, the axial throttling channels are formed by a plurality of cyclone grooves which are obliquely the same and are arranged around the inner cavity wall of the inner sleeve in a circle, and the cyclone grooves in the adjacent axial throttling channels are obliquely opposite; the outer sleeves are sequentially and coaxially sleeved on the inner sleeves from inside to outside, radial throttling channels with the number gradually increasing upwards are arranged between the outermost outer sleeve and the innermost inner sleeve in a penetrating manner along the radial direction, and the multistage radial throttling channels are communicated with the inflow channels; the plunger component, the seal section and inflow passageway sealed sliding fit, the throttle section passes the connecting channel and extends to the axial throttle passageway of bottommost. The control valve adopting the structure meets the requirement of extremely complex working conditions of high pressure difference and large adjustable ratio.

Description

Control valve

Technical Field

The invention relates to the technical field of valves, in particular to a control valve.

Background

Along with the continuous development of the modern industrial automation degree, the control valve needs to meet the extremely complex working condition demands such as high pressure difference, large adjustable ratio and the like. Wherein the adjustable ratio refers to the ratio between the maximum flow rate and the minimum flow rate that can be adjusted.

The current widely used control valve throttling element mainly comprises plunger type, sleeve type, labyrinth type and the like, wherein the labyrinth type and the multistage sleeve type throttling element can consume medium energy to realize pressure reduction small flow, but the two throttling elements have discontinuous dead zones for flow control, so that the flow adjustment is discontinuous, especially the flow adjustment is basically unable to be adjusted under the working condition of small flow, the small flow adjustability is poor, the flow adjustable ratio is low, the requirement of high pressure difference with large adjustable ratio and extremely complex working condition cannot be met, in addition, the plunger type throttling element is difficult to control tightness and leakage grade, the small flow control cannot be realized, the flow adjustment range is limited, namely, the flow adjustable ratio is low, and the requirement of high pressure difference with large adjustable ratio with extremely complex working condition cannot be met. Therefore, the existing control valve cannot realize continuous throttling without dead zones, namely cannot realize continuous controllable and adjustable small flow, and therefore cannot meet the requirements of extremely complex working conditions with high pressure difference and large adjustable ratio.

In summary, how to provide a control valve to meet the requirement of high pressure difference with large adjustable ratio and extremely complex working conditions is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention aims to provide a control valve meeting the requirement of high pressure difference with large adjustable ratio and extremely complex working condition.

In order to achieve the above object, the present invention provides the following technical solutions:

a control valve, comprising:

The valve body is internally provided with a valve cavity, and the side wall of the valve body is provided with a medium inlet and a medium outlet lower than the medium inlet;

The inner cavity of the inner sleeve is divided into an inflow channel, a connecting channel and a plurality of axial throttling channels which are mutually communicated from top to bottom, annular protrusions are arranged at the communication positions of the connecting channel and the uppermost axial throttling channel, the axial throttling channels are formed by arranging a plurality of swirl grooves which are obliquely the same around the inner cavity wall of the inner sleeve, the swirl grooves in the adjacent axial throttling channels are obliquely opposite, and the lowermost axial throttling channel is communicated with the medium outlet;

The medium inlets are communicated with the inflow channels through the multi-stage radial throttling channels;

The plunger component can move up and down and is inserted into the inner cavity of the inner sleeve, the sealing section of the plunger component is in sealing sliding fit with the inflow channel, the throttling section penetrates through the connecting channel to extend to the lowest end of the axial throttling channel, the throttling section is provided with a valve clack which is positioned in the connecting channel, and when the valve clack is in sealing abutting joint with the annular bulge, the sealing section blocks multiple stages of radial throttling channels and the connecting channel.

Preferably, the outer sleeve and the inner sleeve are provided with a plurality of through holes which are gradually increased in number along the axial direction from outside to inside on the same radial throttling surface, and two adjacent outer sleeves on the same radial throttling surface are staggered and communicated with the plurality of through holes on the inner sleeve to form a folding radial throttling channel.

Preferably, the inner sleeve and the outer sleeve on the same radial throttling surface are uniformly distributed with a plurality of through holes at equal intervals around the axial direction, and the number of the through holes increases along the axial direction along with the lifting percentage of the plunger component.

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

Preferably, the throttling section in the axial throttling channel is provided with edges which are all in a horn shape and have large-diameter ends facing downwards, and the maximum diameter of the edges is smaller than the diameter of the axial throttling channel.

Preferably, the throttle section is split type structure, from top to bottom divide into opening and close pole and a plurality of throttle pole, the top of opening and close the pole with the seal section is connected, the bottom sets up the valve clack, valve clack and uppermost the top of throttle pole is dismantled and is connected, and the balance the top of throttle pole and rather than adjacent the bottom of throttle pole is dismantled and is connected, and each the bottom of throttle pole all sets up the border.

Preferably, the plurality of swirl grooves are circumferentially arranged on the inner cavity wall of the inner sleeve at equal intervals, and extend for a certain distance along the axial direction of the inner sleeve and are arranged at a certain inclined angle with the axial direction of the inner sleeve so as to form the axial throttling channel.

Preferably, the device further comprises a valve cover, the valve cover is fixed on the top end of the inner sleeve in a sealing mode, an annular groove is formed in the inner side wall of the valve body between the medium outlet and the medium outlet, an annular protrusion is arranged on the outer wall of the inner sleeve, and the annular protrusion is in sealing abutting connection with the annular groove.

Preferably, the valve rod further comprises a valve rod and a driving mechanism, wherein the top end of the valve rod is connected with the driving mechanism, and the bottom end of the valve rod penetrates through the valve cover and is coaxially connected with the plunger component.

Preferably, the device further comprises a control unit, wherein the control unit is in electrical signal connection with the driving mechanism.

Compared with the prior art, the application has the advantages that the plurality of outer sleeves are sequentially sleeved on the inner sleeve from inside to outside, the radial throttling channels with the number increased gradually are arranged between the outermost outer sleeve and the innermost inner sleeve in a penetrating way along the radial direction so as to form multi-stage radial throttling channels, as the valve position is adjusted downwards, namely the plunger component moves downwards, the number of the radial throttling channels is reduced gradually in the process that the sealing section sequentially opens each stage of radial throttling channel from top to bottom, correspondingly, the medium flow of the medium inlet flowing into the inner cavity of the inner sleeve is reduced gradually, the smaller the number of the radial throttling channels is, the larger the flow resistance is, namely the radial throttling channels are the least when the valve position is positioned at a low valve position, the valve group ratio is the largest, the high pressure difference resistance and the small flow regulation are realized, in addition, the valve clack and the annular bulge are prevented from flowing out in a sealing way, so that the leakage quantity is zero sealing characteristic, the small flow of the medium is adjusted downwards by controlling the plunger component, and the valve clack and the annular bulge are controlled to be in a sealing way, when the valve clack and the annular bulge are in a sealing way, the flow is adjusted to be the largest, and the pressure difference is required to be high.

On the basis of realizing radial throttling of the medium, the axial continuous uninterrupted throttling of the medium is further realized, and particularly, because the axial throttling channels are formed by arranging a plurality of spiral flow grooves with the same slant around the inner cavity wall of the inner sleeve, friction is blocked to form vortex after the medium flows into the axial throttling channels, and the slant directions of the spiral flow grooves in the adjacent axial throttling channels are opposite, so that the medium continuously and alternately forms forward vortex and reverse vortex in the process of sequentially flowing into the plurality of axial throttling channels downwards through the connecting channels, so as to generate huge resistance, and simultaneously consume kinetic energy of the medium again, thereby realizing continuous uninterrupted controllable and adjustable resistance to different high pressure differences and small flow, achieving the standard continuous flow characteristic curve of the control valve, further realizing small flow down-regulation of the medium, having good small flow, greatly improving the flow regulation range, namely greatly improving the medium flow adjustable ratio, and meeting the requirements of extremely complex working conditions of high pressure difference and large adjustable ratio.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a control valve according to the present application;

FIG. 2 is an assembly view of a multi-stage sleeve radial throttling element and a plunger axial throttling element provided by the present application;

FIG. 3 is a cross-sectional view taken at I-I of FIG. 2;

FIG. 4 is a cross-sectional view at II-II in FIG. 2;

FIG. 5 is a schematic view of an inner sleeve according to the present application;

FIG. 6 is a schematic view of a plunger member according to the present application in a minimum valve position (adjusted to a minimum flow rate);

FIG. 7 is a schematic view of a sealing state of a valve flap and an annular protrusion according to the present application;

FIG. 8 is a schematic illustration of different radial throttle surfaces of an inner sleeve and an outer sleeve provided by the present application;

FIG. 9 is a schematic view showing the progressive increase in the number of through holes in the inner sleeve and the outer sleeve from the bottom to the top of the multistage radial throttle surface provided by the present application.

In fig. 1-9:

1 is a valve body, 2 is a valve cover, 3 is a valve rod, 4 is a driving mechanism, 5 is an inner sleeve, 6 is an outer sleeve, and 7 is a plunger component;

11 is a medium inlet, 12 is a medium outlet;

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 bulge;

61 is a radial throttling channel and 61-1 is a through hole;

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 clack, and 74 is an edge.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The core of the invention is to provide a control valve meeting the requirements of high pressure difference, large adjustable ratio and extremely complex working conditions.

It should be noted that, in the present embodiment, the orientation or positional relationship indicated by "up", "down", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Referring to fig. 1 to 9, the present application provides a control valve comprising a valve body 1, an inner sleeve 5, a number of outer sleeves 6 and a plunger member 7.

The valve body 1 is internally provided with a valve cavity, and the side wall of the valve body 1 is provided with a medium inlet 11 and a medium outlet 12 which is lower than the medium inlet.

The inner sleeve 5 is arranged in the valve cavity and is in sealing connection with the inner wall of the valve cavity, the inner cavity of the inner sleeve 5 is divided into an inflow channel 51, a connecting channel 52 and a plurality of axial throttling channels 53 which are mutually communicated from top to bottom, annular protrusions 54 are arranged at the communication positions of the connecting channel 52 and the uppermost axial throttling channel 53, the axial throttling channels 53 are formed by arranging a plurality of swirl grooves 53-1 which are obliquely the same around the inner cavity wall of the inner sleeve 5, the swirl grooves 53-1 in the adjacent axial throttling channels 53 are obliquely opposite, and the lowermost axial throttling channel 53 is communicated with the medium outlet 12.

The outer sleeves 6 are sequentially and coaxially sleeved on the inner sleeve 5 from inside to outside, radial throttling channels 61 with the number gradually increasing upwards are arranged between the outermost outer sleeve 6 and the innermost inner sleeve 5 in a penetrating manner along the radial direction, and the medium inlets 11 are communicated with the inflow channels 51 through the multi-stage radial throttling channels 61.

The plunger member 7 is inserted into the inner cavity of the inner sleeve 5 in a vertically movable manner, the sealing section 71 of the plunger member 7 is in sealing sliding fit with the inflow channel 51, the throttling section 72 extends to the lowest axial throttling channel 53 through the connecting channel 52, the throttling section 72 is provided with a valve clack 73 which is positioned in the connecting channel 52, and when the valve clack 73 is in sealing abutting joint with the annular protrusion 54, the sealing section 71 blocks the multi-stage radial throttling channel 61 from the connecting channel 52.

Specifically, referring to fig. 2 and 5, a plurality of outer sleeves 6 are axially sleeved with the inner sleeves 5 to form a multi-stage sleeve radial throttling element, so as to realize radial throttling of media, radial throttling channels 61 are radially and penetratingly arranged from the outermost outer sleeve 6 to the innermost inner sleeve 5, the number of the radial throttling channels 61 is increased step by step along the axial direction to form multi-stage radial throttling channels 61, each stage of radial throttling channels 61 is communicated with an inflow channel 51 in the inner sleeve 5, the smaller the number of the radial throttling channels 61 is, the more the media collide with the cylinder wall, the larger the flow resistance is, the greater the kinetic energy loss of the media is, optionally, the plurality of outer sleeves 6 and the inflow channel 51 in the inner sleeve 5 are located at the same height in the axial direction, so that the media can flow into the inner sleeve 5 through the media inlet 11 and the radial throttling channels 61, and the plurality of outer sleeves 6 are arranged in a non-unique number, and can be arranged according to practical requirements.

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 is in sliding sealing fit with the inflow channel 51 in the inner sleeve 5, at the initial valve position, namely, the control valve is closed, no medium flows out, the valve clack 73 is in sealing abutting joint with the annular bulge 54, the connecting channel 52 and the axial throttling channel 53 can be blocked, medium is prevented from flowing out of the medium outlet 12 through the axial throttling channel 53, as a tiny gap exists between the sealing section 71 and the inner wall of the inflow channel 51 in sealing fit, when the valve clack 73 is in sealing abutting joint with the annular bulge 54, the sealing section 71 shields the lowest one-stage radial throttling channel 61 to block the multistage radial throttling channel 61 from the connecting channel 52, even if the medium flows into the connecting channel 52 through the one-stage radial throttling channel 61 through the tiny gap, the minimum flow can not be controlled in the range of 0.01% -1%, the valve resistance is maximum at the small flow, and the actual adjustable ratio is close to the ideal adjustable ratio. Thus, as shown in fig. 6 and 7, as the valve position is adjusted downwards, i.e. the plunger member 7 moves downwards, in the process of sequentially opening each stage of radial throttling channels 61 from top to bottom, the number of radial throttling channels 61 is gradually reduced, the medium kinetic energy loss is gradually increased, the medium flow rate of the medium flowing into the inner cavity of the inner sleeve 5 from the medium inlet 11 is gradually reduced, so as to reduce the medium high pressure difference in a grading and sectional manner, and simultaneously realize small flow down adjustment until the valve clack 73 is in sealing abutting connection with the annular protrusion 54, and the flow adjustment range is large, i.e. the medium flow rate adjustable ratio is high, so as to meet the requirement of the high pressure difference adjustable ratio working condition.

The multistage sleeve radial throttling element is a graded and sectional radial throttling element, the medium flow is adjusted discontinuously to generate faults, the standard continuous flow characteristic curve of the control valve cannot be met, and even if the continuous controllable adjustment of the small flow of the control valve cannot be realized. Further, as shown in fig. 3 to 5, a plurality of axial throttling channels 53 are arranged in the inner sleeve 5, which are communicated with each other and are positioned below the connecting channel 52, each axial throttling channel 53 is formed by arranging a plurality of swirl grooves 53-1 around the inner cavity wall of the inner sleeve 5, the plurality of swirl grooves 53-1 incline by the same angle relative to the axis of the inner sleeve 5, so that the friction is blocked to form vortex after the medium flows into each axial throttling channel 53, and the inclination directions of the swirl grooves 53-1 in two adjacent axial throttling channels 53 are opposite, so that the medium continuously and alternately forms forward vortex and reverse vortex in the process of flowing into the plurality of axial throttling channels 53 downwards through the connecting channel 52, so as to generate huge resistance to generate medium kinetic energy again, thereby realizing continuous uninterrupted and controllable adjustment of different high pressure differences and small flow resistance, achieving the standard continuous flow characteristic curve of the control valve, having good adjustability of small flow, greatly improving the flow adjustment range, namely greatly improving the adjustable ratio of the medium flow, and meeting the requirements of extremely complex working conditions of high pressure difference and large adjustable ratio.

Considering the specific arrangement of the radial throttling channels 61, referring to fig. 5 and 8, on the basis of the above embodiment, a plurality of through holes 61-1 are formed on the same radial throttling surface from the outside to the inside, and the wall of the inner sleeve 5, and the number of through holes 61-1 is gradually increased along the axial direction, and two adjacent outer sleeves 6 on the same radial throttling surface are staggered and communicated with the plurality of through holes 61-1 on the inner sleeve 5 to form a folded radial throttling channel 61.

Specifically, the outer sleeves 6 are coaxially sleeved with the inner sleeve 5, the same radial throttling surface is formed by cutting the outermost outer sleeve 6 to the innermost inner sleeve 5 along the vertical coaxial direction, a plurality of through holes 61-1 are formed in the circumferential direction of the wall of the inner sleeve 5, a plurality of through holes 61-1 are also formed in the circumferential direction of the wall of the outer sleeve 6 which is positioned on the same radial throttling surface, two adjacent outer sleeves 6 and two adjacent outer sleeves 6 on the same radial throttling surface are staggered and communicated with the plurality of through holes 61-1 on the inner sleeve 5 to form a folding radial throttling channel 61, the folding radial throttling channel 61 is greatly bent to form a large folding flow resistance, medium kinetic energy can be greatly consumed, a large high pressure difference can be resisted, and the device is better suitable for the working condition of high pressure difference and small flow. It should be noted that, the number of through holes 61-1 on the inner sleeve 5 and the outer sleeve 6 increases stepwise upward in the axial direction, so that the number of the turn-around radial throttle channels 61 in the multi-stage radial throttle channels 61 increases stepwise from bottom to top, and the number of turns of the medium turns decreases.

The relative stroke and the relative flow of the regulating valve are not in direct relation under different opening degrees, and the flow change caused by unit stroke change at each point of the stroke is in direct proportion to the flow of the point, so the control valve is controlled according to an equal-percentage flow curve, the flow change is small when the flow is small, the flow change is large when the flow is large, and the regulating valve has the same precision and strong adaptability under different opening degrees.

In order to realize the equal percentage flow curve control, on the basis of the embodiment, a plurality of through holes 61-1 are uniformly distributed on the inner sleeve 5 and the outer sleeve 6 on the same radial throttling surface at equal intervals around the axial direction, and the number of the through holes 61-1 is increased along the axial direction along with the lift percentage of the plunger member 7. That is, the plunger member 7 has a smaller increase in the number of radial throttle passages 61 from the lower to the upper stage of radial throttle passages 61 before the upward movement stroke of 50%, and has a larger increase in the number of radial throttle passages 61 from the lower to the upper stage of radial throttle passages 61 after 50%, to meet the equal percentage flow rate curve control demand, thereby better and precisely controlling the control valve in a large flow rate adjustment range. Wherein, the number of through holes 61-1 is set from the inner sleeve 5 and the outer sleeve 6 on the same radial throttling surface in each stage of radial throttling channel 61 from bottom to top, 10 stages of radial throttling surfaces can be cut from the outermost outer sleeve 6 to the innermost inner sleeve 5 from bottom to top, 10 stages of radial throttling channels 61 are correspondingly formed, and the number of through holes 61-1 of the inner sleeve 5 and the outer sleeve 6 on the same radial throttling surface in each stage of radial throttling channel 61 from bottom to top is gradually increased as shown in fig. 8 and 9.

To further enhance the axial throttling effect, the outer diameter of the valve flap 73 is gradually increased from top to bottom on the basis of the above embodiment, so as to increase the collision area of the medium and the valve flap 73, increase the kinetic energy consumption of the medium, and ensure that the medium smoothly flows downwards, and the maximum outer diameter of the valve flap 73 is smaller than the diameter of the connecting channel 52, so as to ensure that the medium can flow downwards into the axial throttling channel 53 along the connecting channel 52, and the maximum outer diameter of the valve flap 73 is larger than the inner diameter of the annular protrusion 54, so as 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 simultaneously ensuring that the medium flow can be adjusted downwards to the minimum flow, so as to ensure that the control valve of the application has a large adjustable ratio.

Optionally, an annular protrusion is also disposed at the connection portion of the connection channel 52 and the bottom end of the inflow channel 51, and similarly, the maximum outer diameter of the valve flap 73 is larger than the inner diameter of the annular protrusion, so as to prevent the valve flap 73 from sliding into the inflow channel 51 to affect the medium flowing down, where the position of the valve flap 73 on the throttle section 72 located in the connection channel 52 needs to be set according to the stroke of the plunger member 7.

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 the edges 74 which are all in a horn shape and have the large diameter end facing downwards, and the maximum diameter of the edges 74 is smaller than the diameter of the axial throttling channel 53, so as to increase the collision area of the medium and the valve clack 73, increase the kinetic energy consumption of the medium, and ensure that the medium smoothly flows downwards.

Considering the specific structure of the plunger member 7, on the basis of the above embodiment, the throttle section 72 is of a split structure, which is divided into an opening and closing rod 72-1 and a plurality of throttle rods 72-2 from top to bottom, the top end of the opening and closing rod 72-1 is connected with the seal section 71, the bottom end is provided with a valve flap 73, the valve flap 73 is detachably connected with the top end of the uppermost throttle rod 72-2, the top ends of the rest throttle rods 72-2 and the bottom ends of the throttle rods 72-2 adjacent to the rest throttle rods are detachably connected, and the bottom ends of the throttle rods 72-2 are all provided with edges 74. The plunger member 7 with the above structure is convenient for processing the plunger member 7, and the throttle rod 72-2 is convenient for dismounting and mounting, so that the plunger member 7 can be adjusted according to control valves with different numbers of axial throttle channels 53 in different specifications.

In consideration of 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 on the inner cavity wall of the inner sleeve 5 at equal intervals, and each of the swirl grooves extends a certain distance along the axial direction of the inner sleeve 5 and is 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 swirl grooves 53-1 in the axial throttle passage 53 are equally spaced and arranged at the same inclination angle, so that the medium flowing into the axial throttle passage 53 is uniformly friction-blocked, and is preferably rotated continuously in the same swirl direction to form a swirl.

In order to firmly and sealingly arrange the radial elements of the multi-stage sleeve in the valve body 1, the application further comprises, on the basis of the above-described embodiments, a valve cap 2, the valve cap 2 being sealingly fastened to the top end of the inner sleeve 5, an annular groove being provided on the inner side wall of the valve body 1 between the medium outlet 12 and the medium outlet 12, an annular projection 54 being provided on the outer wall of the inner sleeve 5, the annular projection 54 being sealingly abutted in the annular groove.

In addition, the application also comprises a valve rod 3 and a driving mechanism 4, wherein the top end of the valve rod 3 is connected with the driving mechanism 4, the bottom end of the valve rod penetrates through the valve cover 2 and is coaxially connected with the plunger member 7, and the driving mechanism 4 is used for driving the valve rod 3 to move up and down so as to control the plunger member 7 to move up and down, namely, the valve position of the control valve.

Preferably, the application further comprises a control unit, and the control unit is in electric signal connection with the driving mechanism so as to realize remote accurate and automatic control of the up-and-down movement of the plunger member 7, namely, accurate control of the valve position of the control valve.

In summary, the application has the following advantages:

(1) The standard continuous flow characteristic curve of the control valve is achieved by utilizing radial deflection throttling and axial positive and negative staggered vortex throttling, the size flow control deviation index is reduced, and the control valve is prevented from generating a stepped unsmooth discontinuous dead zone flow characteristic curve.

(2) The radial deflection throttling and the axial positive and negative staggered vortex throttling are utilized, the small flow adjustability is good, the medium flow adjustable ratio is greatly improved, and therefore the requirements of extremely complex working conditions of high pressure difference and large adjustable ratio are met.

(3) The control valve has unique advantages in the aspects of high strength, cavitation resistance, flash evaporation and cavitation prevention, noise reduction, vibration reduction and the like.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The control valve provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims (10)

1. A control valve, comprising:

The valve comprises a valve body (1), wherein a valve cavity is formed in the valve body, and a medium inlet (11) and a medium outlet (12) lower than the medium inlet are formed in the side wall of the valve body (1);

The inner sleeve (5) is arranged in the valve cavity and is in sealing connection with the inner wall of the valve cavity, the inner cavity of the inner sleeve (5) is divided into an inflow channel (51), a connecting channel (52) and a plurality of axial throttling channels (53) which are mutually communicated from top to bottom, annular protrusions (54) are arranged at the communication positions of the connecting channel (52) and the uppermost axial throttling channel (53), the axial throttling channels (53) are formed by arranging a plurality of swirl grooves (53-1) which are obliquely the same around the inner cavity wall of the inner sleeve (5), the swirl grooves (53-1) in the adjacent axial throttling channels (53) are obliquely opposite, and the lowermost axial throttling channel (53) is communicated with the medium outlet (12);

The medium inlets (11) are communicated with the inflow channels (51) through the radial throttling channels (61) which are gradually increased in number upwards;

The plunger component (7) can be inserted into the inner cavity of the inner sleeve (5) in an up-and-down moving mode, the sealing section (71) of the plunger component (7) is in sealing sliding fit with the inflow channel (51), the throttling section (72) penetrates through the connecting channel (52) to extend to the lowest end of the axial throttling channel (53), the throttling section (72) is provided with a valve clack (73) which is located in the connecting channel (52), and when the valve clack (73) is in sealing abutting joint with the annular protrusion (54), the sealing section (71) blocks multiple stages of the radial throttling channel (61) and the connecting channel (52).

2. Control valve according to claim 1, characterized in that the walls of the outer sleeve (6) and the inner sleeve (5) from outside to inside on the same radial throttle surface are provided with a plurality of through holes (61-1) which gradually increase in number upwards along the axial direction, and two adjacent outer sleeves (6) on the same radial throttle surface and the adjacent outer sleeves (6) are staggered and communicated with the plurality of through holes (61-1) on the inner sleeve (5) to form a folded radial throttle channel (61).

3. A control valve according to claim 2, characterized in that the inner sleeve (5) and the outer sleeve (6) on the same radial throttle surface are each equally spaced apart a number of the through holes (61-1) around the axial direction at a circle, and the number of the through holes (61-1) increases in the axial direction with the plunger member (7) lift etc. percentage.

4. The control valve according to claim 1, characterized in that the external diameter of the flap (73) increases gradually from top to bottom, and the maximum external diameter of the flap (73) has a value smaller than the diameter of the connecting channel (52) and larger than the internal diameter of the annular projection (54).

5. A control valve according to claim 4, characterized in that the throttle section (72) in the axial throttle channel (53) is provided with rims (74) each having a trumpet shape and a large diameter end facing downwards, and that the largest diameter of the rims (74) is smaller than the diameter of the axial throttle channel (53).

6. The control valve according to claim 5, characterized in that the throttle section (72) is of a split structure, which is divided into an opening and closing rod (72-1) and a plurality of throttle rods (72-2) from top to bottom, the top end of the opening and closing rod (72-1) is connected with the sealing section (71), the bottom end is provided with the valve clack (73), the valve clack (73) is detachably connected with the top end of the uppermost throttle rod (72-2), the top ends of the rest throttle rods (72-2) are detachably connected with the bottom ends of the throttle rods (72-2) adjacent to the throttle rods, and the bottom ends of the throttle rods (72-2) are all provided with the edge (74).

7. A control valve according to claim 1, characterized in that a number of swirl grooves (53-1) are circumferentially arranged at equal intervals on the inner chamber wall of the inner sleeve (5) and each extend a distance in the axial direction of the inner sleeve (5) and are arranged at an oblique angle to the axial direction of the inner sleeve (5) so as to form the axial throttle channel (53).

8. A control valve according to any one of claims 1 to 7, further comprising a valve cover (2), said valve cover (2) being sealingly secured to the top end of said inner sleeve (5), an annular groove being provided on the inner side wall of said valve body (1) between said medium outlet (12) and said medium outlet (12), an annular protrusion (54) being provided on the outer wall of said inner sleeve (5), said annular protrusion (54) being sealingly abutted in said annular groove.

9. A control valve according to claim 8, further comprising a valve stem (3) and a drive mechanism, the top end of the valve stem (3) being connected to the drive mechanism and the bottom end being coaxially connected to the plunger member (7) through the valve cap (2).

10. The control valve of claim 9, further comprising a control unit in electrical signal connection with the drive mechanism.