A multi-stage pressure-stabilizing flow regulating valve and its regulating component

Abstract

The present invention relates to the field of pressure-stabilizing flow regulating valves, and provides a multi-stage pressure-stabilizing flow regulating valve, comprising a valve body, a valve cover, a compression sleeve, an actuator, a packing assembly, and an adjusting assembly. A regulating assembly for a multi-stage pressure-stabilizing flow regulating valve, comprising a valve core, a core bag, and a valve seat. The present invention "blocks" the fluid medium by arranging multiple protrusions and flanges in multiple channels and a single channel, thereby achieving pressure reduction and flow control for the high-pressure difference fluid medium. At the same time, the core bag is an integrated structure, which is convenient to produce and install, and has high working stability. The fluid medium is further pressure-reduced and stabilized and accurately controlled by multiple chambers. The multi-stage frustum structure is cleverly used to achieve the function without affecting the normal free movement of the valve core and the core rod, making the control more precise, while reducing cavitation on the sealing surface, improving the overall sealing and stability of the regulating valve, and thus extending the service life. The rigid sealing structure is adopted to reduce the use of seals, with good sealing performance, and high corrosion resistance and wear resistance.

Description

Technical Field

[0001] The present invention relates to the field of pressure-stabilizing flow regulating valves, in particular to a multi-stage pressure-stabilizing flow regulating valve. Background Art

[0002] In water circulation systems in power plants and the petrochemical industry, fluids often experience high pressure differentials and high temperatures. In some cases, precise flow control is required using control valves. Existing labyrinth control valves have a relatively simple structure, either reducing speed or pressure. They cannot simultaneously meet the requirements of reducing speed, reducing pressure, and controlling flow.

[0003] After searching, the Chinese utility model patent with application number "202021558447.8" owned by Shanghai Kaisa Yanke Valve Co., Ltd. discloses a multi-stage pressure-reducing valve, including a valve body and a valve cover installed on the valve body. A valve cavity is provided in the valve body, and flow channels are provided at both ends of the valve cavity. A valve core and a valve seat are provided in the valve cavity. The valve seat is arranged between the valve core and the valve body and seals with the two. A valve stem for driving the valve core close to or away from the valve seat is provided on the valve core. A labyrinth layer assembly is provided on the outer periphery of the valve core above the valve seat. The labyrinth layer assembly includes multiple labyrinth layers, and the joints between adjacent labyrinth layers are opened to form a labyrinth. Multiple concave-convex labyrinthine flow channels are evenly arranged circumferentially around the axis of the labyrinthine layer assembly. The labyrinthine flow channels include multiple flow channel units, each of which includes a first horizontal channel, a descending vertical channel, a second horizontal channel, and an ascending vertical channel. The first and second horizontal channels are arranged radially along the labyrinthine layer, while the descending vertical channel and the ascending vertical channel are arranged axially along the labyrinthine layer. The first horizontal channel, the descending vertical channel, the second horizontal channel, and the ascending vertical channel are connected end to end in this order, and the first horizontal channels and ascending vertical channels of adjacent flow channel units are connected end to end.

[0004] This patent adopts multiple labyrinthine flow channels with concave and convex shapes, and achieves a certain degree of pressure reduction by extending the flow path of the fluid in the flow channel and increasing the time the medium passes through the flow channel. However, the extension of the flow path is limited, and this structure cannot achieve "multi-stage pressure reduction". It can only be used in situations with low pressure differences. At the same time, this patent adopts a multi-layer disc structure. Due to the narrow flow channel, precise alignment between each layer is required, and the two half-discs on the same layer also need to be precisely aligned, which makes installation troublesome. Multiple flow channels need to be processed at intervals in the radial direction of the disc, and production efficiency is low. More importantly, in a high pressure difference environment, the flushing force of the medium on the multi-layer disc is unevenly distributed. After exceeding the limit, the discs on each layer are displaced and the displacement is different, affecting normal use. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention provides a multi-stage pressure-stabilizing flow control valve and a regulating component thereof, which can realize multi-stage pressure reduction, pressure stabilization and flow regulation for high-pressure differential fluid media.

[0006] 3. The throttle body of claim 1, wherein the throttle body is provided with a plurality of camshafts, the camshafts being connected to the throttle body by a plurality of camshafts and a plurality of camshafts being connected. , and then the compression sleeve is fixedly connected to the valve core, and the valve core is arranged in the through hole of the core package; the core package includes an upper core package and a lower core package, and the upper core package and the lower core package are an integrally formed structure, an outer annular flow channel is opened inside the upper core package, and an outer annular partition and an inner annular partition are fixedly arranged on the lower core package, the outer annular partition is inserted into the outer annular flow channel to separate the outer annular flow channel into a first ascending flow channel and a first descending flow channel, and the inner annular partition is inserted into the through hole of the core package to separate the through hole of the core package into a second ascending flow channel and a retention area, the first The lower end of the ascending flow channel is connected to the core pack medium inlet, the upper end of the first ascending flow channel is connected to the upper end of the first descending flow channel, the lower end of the first descending flow channel is connected to the lower end of the second ascending flow channel, the upper end of the second ascending flow channel is connected to the upper part of the retention area, and the lower part of the retention area is the core pack medium outlet. A number of annular protrusions are fixedly provided on the inner walls on both sides of the outer annular flow channel, and a number of annular flanges are fixedly provided on both sides of the outer annular partition, and the annular protrusions and the annular flanges are not on the same horizontal plane.

[0007] Furthermore, the annular flanges on both sides of the outer annular partition are arranged alternately with the annular protrusions on the inner walls on both sides of the outer annular flow channel, that is, any annular flange in the vertical direction is located between two annular protrusions, realizing multiple "blockages" of the fluid medium, thereby achieving the purpose of slowing down the flow and reducing the pressure.

[0008] Furthermore, the two annular protrusions located opposite to each other on the inner walls on both sides of the outer annular flow channel are on the same horizontal plane, the two annular flanges located opposite to each other on both sides of the outer annular partition are on the same horizontal plane, the annular protrusions located on the inner wall of the outer annular flow channel are arranged at equal intervals in the vertical direction, the annular flanges located on the outer annular partition on the same side are arranged at equal intervals in the vertical direction, and the outer annular surfaces of the oppositely arranged annular flanges and the inner annular surfaces of the annular protrusions are on the same cylindrical surface.

[0009] Furthermore, the retention area includes a retention chamber, a first pressure-reducing chamber, and a second pressure-reducing chamber. The retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber are arranged in sequence from top to bottom. The inner side of the inner annular partition is fixedly provided with a first boss, a second boss, and a third boss from top to bottom. The first boss, the second boss, and the third boss respectively constitute the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber. Three gates are respectively provided on the valve core to control the opening and closing of the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber. The amount of medium and the residence time in the retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber are controlled by controlling the up and down movement of the valve core, thereby realizing further multi-stage pressure reduction, stabilization, and flow control of the medium, while protecting the sealing surface from cavitation.

[0010] Furthermore, the valve core includes a core rod, an inverted frustum gate, a first double frustum gate, and a second double frustum gate. The thicker section of the core rod is connected to the thinner section of the core rod via the inverted frustum gate. The first double frustum gate and the second double frustum gate are fixedly mounted on the thinner section of the core rod. The first double frustum gate includes a first upper frustum, a first lower frustum, and a first connecting post. The first upper frustum and the first lower frustum are connected via the first connecting post. The second double frustum gate includes a second upper frustum, a second lower frustum, and a second connecting post. The second upper frustum and the second lower frustum are connected via the second connecting post. The outer diameter of the thicker section of the core rod, the outer diameter of the first connecting post, the outer diameter of the second connecting post, the inner diameter of the first boss, the inner diameter of the second boss, and the inner diameter of the third boss are equal. The design of multiple frustum gates allows for control of the amount of medium and the residence time in the retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber without affecting the normal up and down movement of the valve core rod. This design is ingenious and highly practical.

[0011] Furthermore, an arc-shaped sealing surface is provided at the medium inlet of the valve seat, and a hard alloy layer is welded on the arc-shaped sealing surface and the circumferential side surface of the second lower cone. The circumferential side surface of the second lower cone can move on the arc-shaped sealing surface and the two are rigidly sealed; corrosion-resistant and erosion-resistant; since the sealing surfaces of the valve seat and the valve core have a certain curvature, the regulating valve can be effectively prevented from self-locking, and the rigid sealing precision is high, which can basically approach zero leakage and has good sealing performance.

[0012] A regulating assembly for a multi-stage pressure-stabilizing flow regulating valve comprises a valve core, a core bag and a valve seat, the valve seat is arranged in a valve cavity and the contact surface between the valve seat and the valve cavity is sealed by a sealing member, the core bag is arranged on the valve seat, the valve seat and the core bag are respectively provided with through holes and the two through holes are connected, the valve core is arranged in the through hole of the core bag, the core bag comprises an upper core bag and a lower core bag, the upper core bag and the lower core bag are an integrally formed structure, an outer annular flow channel is opened inside the upper core bag, an outer annular partition and an inner annular partition are fixedly provided on the lower core bag, the outer annular partition is inserted into the outer annular flow channel to separate the outer annular flow channel into a first ascending flow channel and a first descending flow channel The inner annular partition is inserted into the core package through hole to divide the core package through hole into a second ascending flow channel and a retention area. The lower end of the first ascending flow channel is connected to the core package medium inlet, the upper end of the first ascending flow channel is connected to the upper end of the first descending flow channel, the lower end of the first descending flow channel is connected to the lower end of the second ascending flow channel, the upper end of the second ascending flow channel is connected to the upper part of the retention area, and the lower part of the retention area is the core package medium outlet. A number of annular protrusions are fixedly provided on the inner walls on both sides of the outer annular flow channel, and a number of annular flanges are fixedly provided on both sides of the outer annular partition. The annular protrusions and the annular flanges are not on the same horizontal plane.

[0013] Furthermore, the annular flanges on both sides of the outer annular partition are arranged alternately with the annular protrusions on the inner walls on both sides of the outer annular flow channel, that is, any annular flange in the vertical direction is located between two annular protrusions, realizing multiple "blockages" of the fluid medium, thereby achieving the purpose of slowing down the flow and reducing the pressure.

[0014] Furthermore, the two annular protrusions located opposite to each other on the inner walls on both sides of the outer annular flow channel are on the same horizontal plane, the two annular flanges located opposite to each other on both sides of the outer annular partition are on the same horizontal plane, the annular protrusions located on the inner wall of the outer annular flow channel are arranged at equal intervals in the vertical direction, the annular flanges located on the outer annular partition on the same side are arranged at equal intervals in the vertical direction, and the outer annular surfaces of the oppositely arranged annular flanges and the inner annular surfaces of the annular protrusions are on the same cylindrical surface.

[0015] Furthermore, the retention area includes a retention chamber, a first pressure-reducing chamber, and a second pressure-reducing chamber. The retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber are arranged in sequence from top to bottom. The inner side of the inner annular partition is fixedly provided with a first boss, a second boss, and a third boss from top to bottom. The first boss, the second boss, and the third boss respectively constitute the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber. Three gates are respectively provided on the valve core to control the opening and closing of the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber. The amount of medium and the residence time in the retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber are controlled by controlling the up and down movement of the valve core, thereby realizing further multi-stage pressure reduction, stabilization, and flow control of the medium, while protecting the sealing surface from cavitation.

[0016] Furthermore, the valve core includes a core rod, an inverted frustum gate, a first double frustum gate, and a second double frustum gate. The thicker section of the core rod is connected to the thinner section of the core rod via the inverted frustum gate. The first double frustum gate and the second double frustum gate are fixedly mounted on the thinner section of the core rod. The first double frustum gate includes a first upper frustum, a first lower frustum, and a first connecting post. The first upper frustum and the first lower frustum are connected via the first connecting post. The second double frustum gate includes a second upper frustum, a second lower frustum, and a second connecting post. The second upper frustum and the second lower frustum are connected via the second connecting post. The outer diameter of the thicker section of the core rod, the outer diameter of the first connecting post, the outer diameter of the second connecting post, the inner diameter of the first boss, the inner diameter of the second boss, and the inner diameter of the third boss are equal. The design of multiple frustum gates allows for control of the amount of medium and the residence time in the retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber without affecting the normal up and down movement of the valve core rod. This design is ingenious and highly practical.

[0017] Furthermore, an arc-shaped sealing surface is provided at the medium inlet of the valve seat, and a hard alloy layer is welded on the arc-shaped sealing surface and the circumferential side surface of the second lower cone. The circumferential side surface of the second lower cone can move on the arc-shaped sealing surface and the two are rigidly sealed; corrosion-resistant and erosion-resistant; since the sealing surfaces of the valve seat and the valve core have a certain curvature, the regulating valve can be effectively prevented from self-locking, and the rigid sealing precision is high, which can basically approach zero leakage and has good sealing performance.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Multiple channels and multiple protrusions and flanges are set in a single channel to "block" the fluid medium, thereby achieving pressure reduction and flow control for high-pressure differential fluid media. At the same time, the core package is an integrated structure, which is convenient for production and installation and has high working stability.

[0020] 2. The multi-chamber design achieves further pressure reduction and stabilization of the fluid medium and precise flow control. The ingenious use of the multi-stage frustum structure achieves the function without affecting the normal free movement of the valve core and core rod, making the control more precise and reducing cavitation on the sealing surface. It improves the overall sealing and stability of the regulating valve, thereby extending its service life.

[0021] 3. The rigid sealing structure reduces the use of seals, has good sealing performance, and has high corrosion resistance and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a multi-stage pressure-stabilizing flow control valve proposed by the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure after removing the transmission components;

[0024] Figure 3 This is a structural diagram of the regulating assembly when the valve core is in the closed state;

[0025] Figure 4 This is a schematic diagram of the movement of the fluid medium when the valve core is in the open state;

[0026] Figure 5 It is a schematic diagram of the structure after the core package is cut open;

[0027] Figure 6 for Figure 3 A schematic diagram of the structure of the middle part A.

[0028] The reference numerals in the accompanying drawings are as follows:

[0029] 1. Valve body; 101. Valve body medium inlet; 102. Valve body medium outlet; 2. Valve seat; 21. Arc-shaped sealing surface; 3. Core package; 31. Upper core package; 32. Lower core package; 311. Outer annular flow channel; 312. First ascending flow channel; 313. First descending flow channel; 321. Outer annular partition; 322. Inner annular partition; 331. Second ascending flow channel; 34. Core package medium inlet; 35. Core package medium outlet; 4. Valve core; 41. Core rod; 42. Inverted frustum gate; 43. First double frustum gate; 431. First upper frustum; 432. First lower frustum; 433. First connecting column; 44. Second double frustum gate; 441. Second upper frustum; 442. Second lower frustum; 443. Second connecting column; 5. Compression sleeve; 6. Valve cover; 7. Packing; 71. Packing gland; 72. Packing plate; 8. Transmission assembly; 81. Valve stem. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects of the invention easier to understand, the present invention is further described below with reference to the accompanying drawings. It should be noted that the directional words used in the present invention, such as "inside", "outside", "up", "down", "left", "right", "front" and "back", are all for the purpose of briefly and clearly describing the technical solution and should not be understood as limiting the scope of this patent; it should be particularly pointed out that the shapes, patterns and other structures appearing in the drawings related to the background technology are all for the purpose of clearly showing the technical solution of this patent and highlighting the technical improvements of this patent, and should not be understood as the shapes, patterns and other structures of this patent being disclosed by the background technology.

[0031] See attached Figure 1-6A multi-stage pressure-stabilizing flow regulating valve includes a valve body 1, a valve cover 6, a tightening sleeve 5, an actuator, a packing assembly, and an adjusting assembly. A valve body medium inlet 101 and a valve body medium outlet 102 are respectively opened on both sides of the valve body 1. A valve cavity is opened in the valve body 1. The adjusting assembly includes a valve core 4, a core package 3 and a valve seat 2. The valve seat 2 is arranged in the valve cavity and the contact surface of the valve seat 2 and the valve cavity is sealed by a seal. The core package 3 is arranged on the valve seat 2. A through hole is respectively opened in the valve seat 2 and the core package 3, and the two through holes are connected. The tightening sleeve 5 is pressed on the core package 3. The valve cover 6 covers the upper opening of the valve cavity and is between the valve body 1 and the valve body 1. They are connected by fasteners, and a packing groove is opened on the upper part of the gland. The packing assembly includes a packing 7, a packing gland 71, and a packing pressure plate 72. The packing 7 is arranged in the packing groove, and the packing gland 71 covers the packing groove. The packing pressure plate 72 supports the packing gland 71 and is connected to the valve cover 6 through fasteners. The actuator includes a transmission assembly 8 and a valve stem 81. One end of the valve stem 81 is connected to the transmission assembly 8 and can move freely in the vertical direction under the drive of the transmission assembly 8. The other end of the valve stem 81 passes through the packing assembly, the valve cover 6, and the compression sleeve 5 in sequence and is fixedly connected to the valve core 4. The valve core 4 is arranged on the core The core bag 3 is in the through hole of the bag 3; the core bag 3 includes an upper core bag 31 and a lower core bag 32, and the upper core bag 31 and the lower core bag 32 are an integrally formed structure. The upper core bag 31 is provided with an outer annular flow channel 311, and the lower core bag 32 is fixedly provided with an outer annular partition 321 and an inner annular partition 322. The outer annular partition 321 is inserted into the outer annular flow channel 311 to separate the outer annular flow channel 311 into a first ascending flow channel 312 and a first descending flow channel 313. The inner annular partition 322 is inserted into the through hole of the core bag 3 to separate the through hole of the core bag 3 into a second ascending flow channel 331, a retention area, and the first ascending flow channel 312. The lower end of the first rising flow channel 312 is connected to the upper end of the first descending flow channel 313, the lower end of the first descending flow channel 313 is connected to the lower end of the second rising flow channel 331, the upper end of the second rising flow channel 331 is connected to the upper part of the retention area, and the lower part of the retention area is the core pack medium outlet 35. The inner walls on both sides of the outer annular flow channel 311 are respectively fixed with a number of annular protrusions 314, and the two sides of the outer annular partition 321 are respectively fixed with a number of annular flanges 315, and the annular protrusions 314 and the annular flanges 315 are not on the same horizontal plane.

[0032] Preferably, the annular flanges 315 on both sides of the outer annular partition 321 are arranged alternately with the annular protrusions 314 on the inner walls on both sides of the outer annular flow channel 311, that is, any annular flange 315 in the vertical direction is located between two annular protrusions 314, realizing multiple "blockages" of the fluid medium, thereby achieving the purpose of slowing down the flow and reducing the pressure.

[0033] Preferably, the two annular protrusions 314 located opposite to each other on the inner walls on both sides of the outer annular flow channel 311 are on the same horizontal plane, the two annular flanges 315 located opposite to each other on both sides of the outer annular partition 321 are on the same horizontal plane, the annular protrusions 314 located on the inner wall of the outer annular flow channel 311 are arranged at equal intervals in the vertical direction, the annular flanges 315 located on the outer annular partition 321 on the same side are arranged at equal intervals in the vertical direction, and the outer annular surfaces of the oppositely arranged annular flanges 315 and the inner annular surfaces of the annular protrusions 314 are on the same cylindrical surface.

[0034] Preferably, the retention area includes a retention cavity 351, a first pressure-reducing cavity 352, and a second pressure-reducing cavity 353. The retention cavity 351, the first pressure-reducing cavity 352, and the second pressure-reducing cavity 353 are arranged in sequence from top to bottom. The inner side of the inner annular partition 322 is fixedly provided with a first boss 361, a second boss 362, and a third boss 363 from top to bottom. The first boss 361, the second boss 362, and the third boss 363 respectively constitute the gate of the retention cavity 351, the first pressure-reducing cavity 352, and the second pressure-reducing cavity 353. The gate of the retention chamber 351, the gate of the first pressure-reducing chamber 352, and the gate of the second pressure-reducing chamber 353 are respectively provided on the valve core 4 with three gates that can control the opening and closing of the gate of the retention chamber 351, the gate of the first pressure-reducing chamber 352, and the gate of the second pressure-reducing chamber 353. By controlling the up and down movement of the valve core 4, the amount of medium and the residence time in the retention chamber 351, the first pressure-reducing chamber 352, and the second pressure-reducing chamber 353 are controlled, thereby realizing further multi-stage pressure reduction, stabilization and flow control of the medium, and protecting the sealing surface from cavitation.

[0035] Preferably, the valve core 4 includes a core rod 41, an inverted frustum gate 42, a first double frustum gate 43, and a second double frustum gate 44. The thicker section of the core rod 41 is connected to the thinner section of the core rod 41 through the inverted frustum gate 42. The first double frustum gate 43 and the second double frustum gate 44 are fixedly arranged on the thinner section of the core rod 41. The first double frustum gate 43 includes a first upper frustum 431, a first lower frustum 432 and a first connecting column 433. The first upper frustum 431, the first lower frustum 432 and the first connecting column 433 are connected. The platforms 432 are connected via a first connecting post 433. The second double-conical gate 44 includes a second upper conical platform 441, a second lower conical platform 442, and a second connecting post 443. The second upper conical platform 441 and the second lower conical platform 442 are connected via the second connecting post 443. The outer diameter of the thicker section of the core rod 41, the outer diameter of the first connecting post 433, the outer diameter of the second connecting post 443, the inner diameter of the first boss 361, the inner diameter of the second boss 362, and the inner diameter of the third boss 363 are equal. The design of multiple conical gates allows the control of the amount and residence time of the medium in the retention chamber 351, the first pressure-reducing chamber 352, and the second pressure-reducing chamber 353 without affecting the normal upward and downward movement of the core rod 41 of the valve core 4. This design is ingenious and highly practical.

[0036] The fluid medium enters the first ascending flow channel, the first descending flow channel, the second ascending flow channel in sequence from the core pack medium inlet and then enters the retention cavity. After the valve core is opened, it enters the first decompression cavity and the second decompression cavity in sequence and then flows out of the core pack.

[0037] Preferably, an arc-shaped sealing surface 21 is provided at the medium inlet of the valve seat 2, and a hard alloy layer is welded on the arc-shaped sealing surface 21 and the circumferential side surface of the second lower cone 442. The circumferential side surface of the second lower cone 442 can move on the arc-shaped sealing surface 21 and a rigid seal is formed between the two; it is corrosion-resistant and erosion-resistant; since the sealing surfaces of the valve seat 2 and the valve core 4 have a certain curvature, the self-locking of the regulating valve can be effectively prevented, and the rigid sealing precision is high, which can basically approach zero leakage and has good sealing performance.

[0038] See attached Figure 3-6 , a regulating assembly for a multi-stage pressure-stabilizing flow regulating valve, comprising a valve core 4, a core bag 3 and a valve seat 2, the valve seat 2 is arranged in the valve cavity and the contact surface of the valve seat 2 and the valve cavity is sealed by a sealing member, the core bag 3 is arranged on the valve seat 2, the valve seat 2 and the core bag 3 are respectively provided with a through hole and the two through holes are connected, the valve core 4 is arranged in the through hole of the core bag 3, the core bag 3 comprises an upper core bag 31 and a lower core bag 32, the upper core bag 31 and the lower core bag 32 are an integrally formed structure, an outer annular flow channel 311 is opened inside the upper core bag 31, an outer annular partition 321 and an inner annular partition 322 are fixedly provided on the lower core bag 32, the outer annular partition 321 is inserted into the outer annular flow channel 311 to divide the outer annular flow channel 311 into a first ascending flow channel 312 and a first descending flow channel 31 3. The inner annular partition 322 is inserted into the through hole of the core package 3 to divide the through hole of the core package 3 into a second ascending flow channel 331 and a retention area. The lower end of the first ascending flow channel 312 is connected to the core package medium inlet 34, the upper end of the first ascending flow channel 312 is connected to the upper end of the first descending flow channel 313, the lower end of the first descending flow channel 313 is connected to the lower end of the second ascending flow channel 331, the upper end of the second ascending flow channel 331 is connected to the upper part of the retention area, and the lower part of the retention area is the core package 3 medium outlet. A number of annular protrusions 314 are fixedly provided on the inner walls of both sides of the outer annular flow channel 311, and a number of annular flanges 315 are fixedly provided on both sides of the outer annular partition 321. The annular protrusions 314 and the annular flanges 315 are not on the same horizontal plane.

[0039] Preferably, the annular flanges 315 on both sides of the outer annular partition 321 are arranged alternately with the annular protrusions 314 on the inner walls on both sides of the outer annular flow channel 311, that is, any annular flange 315 in the vertical direction is located between two annular protrusions 314, realizing multiple "blockages" of the fluid medium, thereby achieving the purpose of slowing down the flow and reducing the pressure.

[0040] Preferably, the two annular protrusions 314 located opposite to each other on the inner walls on both sides of the outer annular flow channel 311 are on the same horizontal plane, the two annular flanges 315 located opposite to each other on both sides of the outer annular partition 321 are on the same horizontal plane, the annular protrusions 314 located on the inner wall of the outer annular flow channel 311 are arranged at equal intervals in the vertical direction, the annular flanges 315 located on the outer annular partition 321 on the same side are arranged at equal intervals in the vertical direction, and the outer annular surfaces of the oppositely arranged annular flanges 315 and the inner annular surfaces of the annular protrusions 314 are on the same cylindrical surface.

[0041] Preferably, the retention area includes a retention cavity 351, a first pressure-reducing cavity 352, and a second pressure-reducing cavity 353. The retention cavity 351, the first pressure-reducing cavity 352, and the second pressure-reducing cavity 353 are arranged in sequence from top to bottom. The inner side of the inner annular partition 322 is fixedly provided with a first boss 361, a second boss 362, and a third boss 363 from top to bottom. The first boss 361, the second boss 362, and the third boss 363 respectively constitute the gate of the retention cavity 351, the first pressure-reducing cavity 352, and the second pressure-reducing cavity 353. The gate of the retention chamber 351, the gate of the first pressure-reducing chamber 352, and the gate of the second pressure-reducing chamber 353 are respectively provided on the valve core 4 with three gates that can control the opening and closing of the gate of the retention chamber 351, the gate of the first pressure-reducing chamber 352, and the gate of the second pressure-reducing chamber 353. By controlling the up and down movement of the valve core 4, the amount of medium and the residence time in the retention chamber 351, the first pressure-reducing chamber 352, and the second pressure-reducing chamber 353 are controlled, thereby realizing further multi-stage pressure reduction, stabilization and flow control of the medium, and protecting the sealing surface from cavitation.

[0042] Preferably, the valve core 4 includes a core rod 41, an inverted frustum gate 42, a first double frustum gate 43, and a second double frustum gate 44. The thicker section of the core rod 41 is connected to the thinner section of the core rod 41 through the inverted frustum gate 42. The first double frustum gate 43 and the second double frustum gate 44 are fixedly arranged on the thinner section of the core rod 41. The first double frustum gate 43 includes a first upper frustum 431, a first lower frustum 432 and a first connecting column 433. The first upper frustum 431, the first lower frustum 432 and the first connecting column 433 are connected. The platforms 432 are connected via a first connecting post 433. The second double-conical gate 44 includes a second upper conical platform 441, a second lower conical platform 442, and a second connecting post 443. The second upper conical platform 441 and the second lower conical platform 442 are connected via the second connecting post 443. The outer diameter of the thicker section of the core rod 41, the outer diameter of the first connecting post 433, the outer diameter of the second connecting post 443, the inner diameter of the first boss 361, the inner diameter of the second boss 362, and the inner diameter of the third boss 363 are equal. The design of multiple conical gates allows the control of the amount and residence time of the medium in the retention chamber 351, the first pressure-reducing chamber 352, and the second pressure-reducing chamber 353 without affecting the normal upward and downward movement of the core rod 41 of the valve core 4. This design is ingenious and highly practical.

[0043] Preferably, an arc-shaped sealing surface 21 is provided at the medium inlet of the valve seat 2, and a hard alloy layer is welded on the arc-shaped sealing surface 21 and the circumferential side surface of the second lower cone 442. The circumferential side surface of the second lower cone 442 can move on the arc-shaped sealing surface 21 and a rigid seal is formed between the two; it is corrosion-resistant and erosion-resistant; since the sealing surfaces of the valve seat 2 and the valve core 4 have a certain curvature, the self-locking of the regulating valve can be effectively prevented, and the rigid sealing precision is high, which can basically approach zero leakage and has good sealing performance.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 4. Multiple channels and multiple protrusions and flanges are set in a single channel to "block" the fluid medium, thereby achieving pressure reduction and flow control for high-pressure differential fluid media. At the same time, the core package is an integrated structure, which is convenient for production and installation and has high working stability.

[0046] 5. The multi-chamber design achieves further pressure reduction and stabilization of the fluid medium and precise flow control. The ingenious use of the multi-stage frustum structure achieves the function without affecting the normal free movement of the valve core and the core rod, making the control more precise and reducing the cavitation on the sealing surface. It improves the overall sealing and stability of the regulating valve, thereby extending its service life.

[0047] 6. The rigid sealing structure reduces the use of seals, has good sealing performance, and has high corrosion resistance and wear resistance.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A multi-stage pressure-stabilizing flow regulating valve, comprising a valve body, a valve cover, a compression sleeve, an actuator, a packing assembly, and an adjusting assembly. A valve body medium inlet and a valve body medium outlet are respectively opened on both sides of the valve body. A valve cavity is opened in the valve body. The adjusting assembly comprises a valve core, a core bag, and a valve seat. The valve seat is arranged in the valve cavity and the contact surface between the valve seat and the valve cavity is sealed by a seal. The core bag is arranged on the valve seat. A through hole is respectively opened in the valve seat and the core bag, and the two through holes are connected. The compression sleeve is pressed on the core bag. The valve cover covers the upper opening of the valve cavity and is connected to the valve body by a fastener. The valve cover is connected to the valve body, and a packing groove is formed on the upper part of the valve cover. The packing assembly includes a packing, a packing gland, and a packing pressure plate. The packing is arranged in the packing groove, and the packing gland is covered on the packing groove. The packing pressure plate supports the packing gland and is connected to the valve cover through fasteners. The actuator includes a transmission assembly and a valve stem. One end of the valve stem is connected to the transmission assembly and can move freely in the vertical direction under the drive of the transmission assembly. The other end of the valve stem passes through the packing assembly, the valve cover, and the compression sleeve in sequence and is fixedly connected to the valve core. The valve core is arranged in the through hole of the core package. The core package comprises an upper core package and a lower core package, the upper core package and the lower core package are an integrally formed structure, an outer annular flow channel is opened inside the upper core package, an outer annular partition and an inner annular partition are fixedly provided on the lower core package, the outer annular partition is inserted into the outer annular flow channel to divide the outer annular flow channel into a first ascending flow channel and a first descending flow channel, the inner annular partition is inserted into the core package through hole to divide the core package through hole into a second ascending flow channel and a retention area, the lower end of the first ascending flow channel is connected to the core package medium inlet, the upper end of the first ascending flow channel is connected to the upper end of the first descending flow channel, the lower end of the first descending flow channel is connected to the lower end of the second ascending flow channel, the upper end of the second ascending flow channel is connected to the upper part of the retention area, and the lower part of the retention area is the core package medium outlet, a plurality of annular protrusions are fixedly provided on the inner walls on both sides of the outer annular flow channel, a plurality of annular flanges are fixedly provided on both sides of the outer annular partition, and the annular protrusions and the annular flanges are not on the same horizontal plane; The retention area includes a retention chamber, a first pressure-reducing chamber, and a second pressure-reducing chamber. The retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber are arranged in sequence from top to bottom. The inner side of the inner annular partition is fixedly provided with a first boss, a second boss, and a third boss from top to bottom. The first boss, the second boss, and the third boss respectively constitute the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber. The valve core is respectively provided with three gates that can control the opening and closing of the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber.

2. The multi-stage pressure-stabilizing flow control valve according to claim 1, characterized in that: The annular flanges on both sides of the outer annular partition are arranged alternately with the annular protrusions on the inner walls on both sides of the outer annular flow channel.

3. The multi-stage pressure-stabilizing flow control valve according to claim 2, characterized in that: The two annular protrusions located opposite to each other on the inner walls on both sides of the outer annular flow channel are on the same horizontal plane, the two annular flanges located opposite to each other on both sides of the outer annular partition are on the same horizontal plane, the annular protrusions located on the inner wall of the outer annular flow channel are arranged at equal intervals in the vertical direction, the annular flanges located on the outer annular partition on the same side are arranged at equal intervals in the vertical direction, and the outer annular surfaces of the oppositely arranged annular flanges and the inner annular surfaces of the annular protrusions are on the same cylindrical surface.

4. The multi-stage pressure-stabilizing flow control valve according to claim 3, characterized in that: The valve core includes a core rod, an inverted frustum gate, a first double frustum gate, and a second double frustum gate. The thicker section of the core rod is connected to the thinner section of the core rod through the inverted frustum gate. The first double frustum gate and the second double frustum gate are fixedly arranged on the thinner section of the core rod. The first double frustum gate includes a first upper frustum, a first lower frustum and a first connecting column. The first upper frustum and the first lower frustum are connected through the first connecting column. The second double frustum gate includes a second upper frustum, a second lower frustum and a second connecting column. The second upper frustum and the second lower frustum are connected through the second connecting column. The outer diameter of the thicker section of the core rod, the outer diameter of the first connecting column, the outer diameter of the second connecting column, the inner diameter of the first boss, the inner diameter of the second boss, and the inner diameter of the third boss are equal.

5. The multi-stage pressure-stabilizing flow regulating valve according to claim 4, characterized in that: An arcuate sealing surface is provided at the medium inlet of the valve seat. The arcuate sealing surface and the circumferential side surface of the second lower truncated cone are welded with a hard alloy layer. The circumferential side surface of the second lower truncated cone can move on the arcuate sealing surface and the two are rigidly sealed.

6. A regulating assembly for a multi-stage pressure-stabilizing flow regulating valve, for use with a multi-stage pressure-stabilizing flow regulating valve as claimed in claim 5, comprising a valve core, a core pack, and a valve seat, the valve seat being disposed in a valve cavity and the contact surface between the valve seat and the valve cavity being sealed by a seal, the core pack being disposed on the valve seat, the valve seat and the core pack respectively having through holes formed therein, the two through holes being in communication, the valve core being disposed in the through hole of the core pack, and characterized in that: The core package comprises an upper core package and a lower core package, the upper core package and the lower core package are an integrally formed structure, an outer annular flow channel is opened inside the upper core package, an outer annular partition and an inner annular partition are fixedly provided on the lower core package, the outer annular partition is inserted into the outer annular flow channel to divide the outer annular flow channel into a first ascending flow channel and a first descending flow channel, the inner annular partition is inserted into the core package through hole to divide the core package through hole into a second ascending flow channel and a retention area, the lower end of the first ascending flow channel is connected to the core package medium inlet, the upper end of the first ascending flow channel is connected to the upper end of the first descending flow channel, the lower end of the first descending flow channel is connected to the lower end of the second ascending flow channel, the upper end of the second ascending flow channel is connected to the upper part of the retention area, and the lower part of the retention area is the core package medium outlet, a plurality of annular protrusions are fixedly provided on the inner walls on both sides of the outer annular flow channel, a plurality of annular flanges are fixedly provided on both sides of the outer annular partition, and the annular protrusions and the annular flanges are not on the same horizontal plane; The retention area includes a retention chamber, a first pressure-reducing chamber, and a second pressure-reducing chamber. The retention chamber, the first pressure-reducing chamber, and the second pressure-reducing chamber are arranged in sequence from top to bottom. The inner side of the inner annular partition is fixedly provided with a first boss, a second boss, and a third boss from top to bottom. The first boss, the second boss, and the third boss respectively constitute the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber. The valve core is respectively provided with three gates that can control the opening and closing of the gate of the retention chamber, the gate of the first pressure-reducing chamber, and the gate of the second pressure-reducing chamber.

7. The regulating assembly for a multi-stage pressure-stabilizing flow regulating valve according to claim 6, characterized in that: The valve core includes a core rod, an inverted frustum gate, a first double frustum gate, and a second double frustum gate. The thicker section of the core rod is connected to the thinner section of the core rod through the inverted frustum gate. The first double frustum gate and the second double frustum gate are fixedly arranged on the thinner section of the core rod. The first double frustum gate includes a first upper frustum, a first lower frustum and a first connecting column. The first upper frustum and the first lower frustum are connected through the first connecting column. The second double frustum gate includes a second upper frustum, a second lower frustum and a second connecting column. The second upper frustum and the second lower frustum are connected through the second connecting column. The outer diameter of the thicker section of the core rod, the outer diameter of the first connecting column, the outer diameter of the second connecting column, the inner diameter of the first boss, the inner diameter of the second boss, and the inner diameter of the third boss are equal.

8. The regulating assembly for a multi-stage pressure-stabilizing flow regulating valve according to claim 7, characterized in that: An arcuate sealing surface is provided at the medium inlet of the valve seat. The arcuate sealing surface and the circumferential side surface of the second lower truncated cone are welded with a hard alloy layer. The circumferential side surface of the second lower truncated cone can move on the arcuate sealing surface and the two are rigidly sealed.

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