Flow-adjustable multi-stage throttling device and application thereof

Abstract

The application discloses a flow-adjustable multi-stage throttling device and application thereof, wherein the device comprises a front flange pipeline, a flow-adjustable component and a rear flange pipeline, and the front flange pipeline and the rear flange pipeline are tightly connected; the flow-adjustable component comprises a plurality of adjustable orifice plate assemblies arranged in the inner cavity of the flange pipeline formed by the front flange pipeline and the rear flange pipeline; each adjustable orifice plate assembly comprises a sealing cover plate, a bottom plate, an adjusting rod, a rotating disc and a driver; the adjusting rod is arranged in the mounting hole of the bottom plate, the rotating disc is mounted on the bottom plate, the driver is mounted on the sealing cover plate, and the throttling hole of the sealing cover plate and the throttling hole of the bottom plate are communicated to form a throttling window; the driver is used for driving the rotating disc to rotate when rotating; the rotating disc is used for driving the adjusting rod to enter or exit the throttling window through the rotating wheel, so that the effective throttling area of the throttling window is changed. The application can actively and low-noise adjust the flow under different working conditions.

Description

A flow-adjustable multi-stage throttling device and its application Technical Field

[0001] This invention belongs to the field of flow regulation, and more specifically, relates to a flow-adjustable multi-stage throttling device and its application. Background Technology

[0002] Orifice plate devices are widely used in power plant piping systems due to their excellent pressure reduction, cavitation suppression, and noise reduction performance. However, once the conventional orifice plate device is designed, its throttling area is basically fixed, and it is only suitable for the flow demand under a single operating condition, making it difficult to actively adjust the flow for different operating conditions.

[0003] Existing single-stage flow control elements can only meet the flow regulation target, but cannot achieve low-noise and low-vibration flow control performance under high operating pressure conditions. The main reason is that, in actual flow regulation, these elements primarily achieve flow regulation by changing the effective cross-sectional area of ​​the single-stage orifice plate. However, this control method has a serious limitation: single-stage control devices are only suitable for low-pressure operating conditions. For high-pressure conditions, using only single-stage flow control elements, regardless of the control method employed, cannot achieve low-noise and low-vibration control performance. This is because when a single-stage orifice plate operates under large pressure differentials, jetting, cavitation, and flow obstruction phenomena are severe, significantly affecting flow, vibration, and noise performance.

[0004] Existing multi-stage orifice plate devices can only regulate the effective cross-sectional area of ​​the first-stage orifice plate. Under high pressure differential conditions, in order to meet the flow regulation requirements, the first-stage orifice plate will act as the main pressure-bearing part, bearing a large pressure drop. This will result in a high flow velocity at the first-stage orifice plate, leading to severe turbulence and cavitation, which in turn causes high vibration and high air noise, making it impossible to truly achieve low-noise flow regulation performance.

[0005] It is evident that existing flow regulation devices suffer from the technical problem of being unable to actively regulate flow with low noise under different operating conditions. Summary of the Invention

[0006] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a flow-adjustable multi-stage throttling device and its application, thereby solving the technical problem that existing flow regulation devices are difficult to actively regulate the flow with low noise for different operating conditions.

[0007] To achieve the above objectives, according to one aspect of the present invention, a flow-adjustable multi-stage throttling device is provided, comprising: a front flange pipe, a flow regulating component, and a rear flange pipe, wherein the front flange pipe and the rear flange pipe are fastened together.

[0008] The flow regulating component includes: multiple adjustable orifice plate assemblies, which are arranged in the inner cavity of the flange pipe formed by the front flange pipe and the rear flange pipe;

[0009] Each adjustable orifice plate assembly includes: a sealing cover, a base plate, an adjusting rod, a rotating disk, and a driver; the adjusting rod is arranged in a mounting hole in the base plate, the rotating disk is mounted on the base plate, the driver is mounted on the sealing cover, the throttling orifice of the sealing cover and the throttling orifice of the base plate are connected to form a throttling window, and the rotating disk is connected to the adjusting rod through a rotating wheel;

[0010] The driver is used to drive the rotating disk to rotate during rotation;

[0011] The rotating disk is used to drive the adjusting rod into or out of the throttling window by rotating the wheel, thereby changing the effective throttling area of ​​the throttling window.

[0012] Furthermore, along the direction from the fluid inlet to the fluid outlet, the total area of ​​the throttling windows in the plurality of adjustable orifice plate assemblies gradually increases.

[0013] Furthermore, the total area of ​​the throttling window gradually increases in the following manner:

[0014] Along the direction from fluid inlet to fluid outlet, the area of ​​a single throttling window in each adjustable orifice plate assembly is equal, and the number of throttling windows in multiple adjustable orifice plate assemblies gradually increases, so that the total area of ​​the throttling windows in multiple adjustable orifice plate assemblies gradually increases.

[0015] Alternatively, the number of throttling windows in each adjustable orifice plate assembly is equal, and the area of ​​the throttling windows in multiple adjustable orifice plate assemblies gradually increases along the direction from fluid inlet to fluid outlet, so that the total area of ​​the throttling windows in multiple adjustable orifice plate assemblies gradually increases.

[0016] Alternatively, the number and area of ​​throttling windows in each adjustable orifice plate assembly vary, and eventually, along the direction from fluid inlet to fluid outlet, the product of the area and number of throttling windows in multiple adjustable orifice plate assemblies gradually increases.

[0017] Furthermore, the number of throttling windows in each adjustable orifice plate assembly is equal to the number of adjusting rods.

[0018] Furthermore, the adjustable perforated plate assembly also includes a limiting block, which is installed between the base plate and the adjusting rod.

[0019] Furthermore, the flow regulating component also includes: a support sleeve, an axial adjusting ring, and a locating pin.

[0020] Each adjustable orifice plate assembly is fixed in the locating pin holes in the front flange pipe and the rear flange pipe by locating pins. The support sleeve is located between adjacent adjustable orifice plate assemblies, and the axial adjustment ring is located between the support sleeve and the adjustable orifice plate assembly.

[0021] Furthermore, the number of positioning pins is multiple, some of which are used to fix the adjustable orifice plate assembly, and some of which are fixed in the positioning pin holes that cooperate with the sealing cover plate and the support sleeve.

[0022] Furthermore, the adjustable orifice plate assembly also includes: a first sealing ring and a second sealing ring.

[0023] The first sealing ring is arranged in the groove on the outer wall of the adjusting rod, and the second sealing ring is arranged on the mating surface of the sealing cover plate and the bottom plate.

[0024] According to another aspect of the invention, an application of a flow-adjustable multi-stage throttling device is provided, the device being used to regulate the flow rate of fluid in a pipe, the fluid in the pipe flowing along the throttling window of an adjustable orifice plate assembly;

[0025] When the output flow rate is lower than the target flow rate, the driver rotates forward, causing the rotating disk to rotate clockwise. This causes the rotating wheel, which is in line contact with the rotating disk, to move the adjusting rod towards the axis closer to the base plate, thereby increasing the effective throttling window area of ​​the adjustable orifice plate assembly and increasing the output flow rate.

[0026] When the output flow meets the target requirement, stop the driver from running;

[0027] When the output flow rate is higher than the target flow rate, the driver rotates in the opposite direction, causing the rotating disk to rotate counterclockwise. This causes the rotating wheel, which is in line contact with the rotating disk, to move the adjusting rod in the opposite direction away from the axis of the base plate, thereby reducing the effective throttling window area of ​​the adjustable orifice plate assembly and reducing the output flow rate.

[0028] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0029] (1) The flow regulation component of this invention is designed with multiple adjustable orifice plate assemblies. Each adjustable orifice plate assembly has a throttling window. The rotating disk is driven by a driver to rotate, causing the adjusting rod to enter or exit the throttling window, thus realizing synchronous adjustment of the effective throttling area of ​​the throttling window of each adjustable orifice plate assembly. This meets the requirements of high-precision, low-noise flow regulation while being easy to operate. Because the multiple adjustable orifice plate assemblies of this invention form a multi-stage throttling system, low-noise and low-vibration regulation can be achieved even under high-pressure conditions, effectively avoiding jetting and cavitation phenomena. Since each adjustable orifice plate assembly can adjust the throttling window area, the first adjustable orifice plate assembly will not bear a large pressure drop, avoiding severe turbulence and cavitation phenomena. This invention can actively regulate flow rate with low noise under different operating conditions.

[0030] (2) In this invention, the total area of ​​the throttling windows in multiple adjustable orifice plate assemblies gradually increases along the direction from the fluid inlet to the fluid outlet. This further reduces flow noise and cavitation during the throttling process through a step-by-step, gradual pressure reduction. The gradually increasing area during multi-stage throttling reduces the air noise of the final throttling assembly. If the area of ​​each stage is equal or decreased during multi-stage throttling, it will increase the air noise of the final throttling assembly, causing jetting and cavitation phenomena. Furthermore, this invention provides multiple ways to achieve the gradually increasing total area of ​​the throttling windows; the area or number of throttling windows can be adjusted individually, or both can be adjusted simultaneously.

[0031] (3) In this invention, the limiting block is installed between the base plate and the adjusting rod. When the flow regulating device reaches its maximum regulating capacity, the limiting block can limit the maximum displacement of the adjusting rod to avoid damage to the regulating device. The axial adjustment ring of this invention is located between the support sleeve and the adjustable orifice plate assembly to adjust axial installation errors and prevent axial movement of the adjustable orifice plate assembly during operation. The positioning pin of this invention is fixed in the positioning pin hole that mates with the sealing cover plate and the support sleeve to prevent rotational movement of the sealing cover plate during use. Multiple sealing rings can ensure the sealing performance of the device.

[0032] (4) The device of this invention is used to regulate the flow rate of fluid in a pipeline. When the output flow rate is lower than the target flow rate, the effective throttling window area of ​​the adjustable orifice plate assembly is increased to increase the output flow rate. When the output flow rate meets the target requirement, the effective throttling window area of ​​the adjustable orifice plate assembly is not adjusted to ensure that the output flow rate remains unchanged. When the output flow rate is higher than the target flow rate, the effective throttling window area of ​​the adjustable orifice plate assembly is reduced to decrease the output flow rate. This fully demonstrates that the present invention can perform active, low-noise flow regulation for different operating conditions. Attached Figure Description

[0033] Figure 1 is a schematic diagram of a flow-adjustable multi-stage throttling device provided in an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of the adjustable perforated plate assembly provided in an embodiment of the present invention;

[0035] Figure 3(a) is a schematic diagram of the adjustable orifice plate assembly provided in the embodiment of the present invention in the maximum throttling area state;

[0036] Figure 3(b) is a schematic diagram of the adjustable orifice plate assembly provided in the embodiment of the present invention in the minimum throttling area state;

[0037] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0038] 1 is the front flange pipe, 2 is the flow regulating component, 3 is the rear flange pipe, 2-1 is the adjustable orifice plate assembly, 2-2 is the support sleeve, 2-3 is the axial adjusting ring, 2-4 is the positioning pin, 201 is the sealing cover plate, 202 is the base plate, 203 is the adjusting rod, 204 is the limit block, 205 is the rotating disk, 206 is the first sealing ring, 207 is the second sealing ring, 208 is the driver, and 209 is the set screw. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0040] As shown in Figure 1, a low-noise, flow-adjustable, multi-stage throttling device includes: a front flange pipe 1, a flow regulating component 2, and a rear flange pipe 3; the front flange pipe 1 and the rear flange pipe 3 are fastened together by connecting bolts; the flow regulating component 2 includes multiple adjustable orifice plate assemblies 2-1, a support sleeve 2-2, an axial adjustment ring 2-3, and positioning pins 2-4, and the adjustable orifice plate assemblies 2-1 are evenly arranged in the inner cavity of the flange pipe.

[0041] As shown in Figure 2, the adjustable orifice plate assembly 2-1 includes: a sealing cover plate 201, a base plate 202, an adjusting rod 203, a limiting block 204, a rotating disk 205, a first sealing ring 206, a second sealing ring 207, a driver 208, and a set screw 209; wherein, multiple adjusting rods 203 are concentrically arranged in the radial mounting holes of the base plate 202, the rotating disk 205 is mounted on the base plate 202; the driver is mounted on the sealing cover plate 201; the first sealing ring 206 is arranged in the groove on the outer wall of the adjusting rod 203; the second sealing ring 207 is arranged on the mating surface of the sealing cover plate 201 and the base plate 202, and the sealing cover plate 201 and the base plate 202 are provided with throttling windows.

[0042] The flow regulating component 2 is fixed in the pipeline by locating pins 2-4 through the locating pin holes in the front flange pipeline 1 and the rear flange pipeline 3.

[0043] The front flange pipe 1 and the rear flange pipe 3 are fastened together by connecting bolts, and the axial adjusting ring 2-2 is pre-tightened to prevent loosening.

[0044] The adjustable orifice plate assembly 2-1 has four throttling windows with the same throttling area. In addition, the throttling window area of ​​the multiple adjustable orifice plate assemblies gradually increases from left to right.

[0045] The adjusting rod 203 and the rotating disk 205 make line contact using the rotating rollers on the adjusting rod.

[0046] The limit block 204 is installed between the base plate 202 and the adjusting rod 203. When the flow regulating device reaches its maximum regulating capacity, in order to avoid damage to the regulating device, the limit block 204 restricts the maximum displacement of the adjusting rod 203.

[0047] The sealing cover 201 uses the positioning pin 2-4 to cooperate with the support sleeve 2-2 to prevent rotational movement during use.

[0048] The multiple adjustable orifice plate assemblies are identical in structure except for the area of ​​the throttling windows. Each adjustable orifice plate assembly has N throttling windows and N adjusting rods, where N≥1. Along the direction from the fluid inlet to the fluid outlet, the total area of ​​the throttling windows in each adjustable orifice plate assembly gradually increases.

[0049] Alternatively, the plurality of adjustable orifice plate assemblies are identical in structure except for the number of throttling windows and adjusting rods. The number of throttling windows in each adjustable orifice plate assembly is equal to the number of adjusting rods. Along the direction from fluid inlet to fluid outlet, the number of throttling windows in each adjustable orifice plate assembly gradually increases, thereby gradually increasing the total area of ​​the throttling windows in each adjustable orifice plate assembly.

[0050] Alternatively, the number and area of ​​throttling windows in each adjustable orifice plate assembly vary, and eventually, along the direction from fluid inlet to fluid outlet, the product of the area and number of throttling windows in multiple adjustable orifice plate assemblies gradually increases.

[0051] Example 1

[0052] A low-noise, adjustable flow rate multi-stage throttling device includes: a front flange pipe 1, a flow regulating component 2, and a rear flange pipe 3; the flow regulating component 2 includes multiple adjustable orifice plate assemblies 2-1, a support sleeve 2-2, an axial adjusting ring 2-3, and a positioning pin 2-4. The adjustable orifice plate assembly 2-1 includes: a sealing cover plate 201, a base plate 202, an adjusting rod 203, a limiting block 204, a rotating disk 205, a first sealing ring 206, a second sealing ring 207, a driver 208, and a set screw 209. The driver can be a frameless motor.

[0053] The flow regulating component 2 is fixed to the pipeline via positioning pin holes in the front flange pipe 1 and the rear flange pipe 3 using positioning pins 2-4. The front flange pipe 1 and the rear flange pipe 3 are fastened together with connecting bolts. To prevent loosening, the axial adjusting ring 2-2 is pre-tightened, with the tightening torque of the connecting bolts set to 40 N·m. The adjustable orifice plate assembly 2-1 has four throttling windows of equal throttling area each. Furthermore, the throttling window areas of multiple adjustable orifice plate assemblies gradually increase from left to right. The adjusting rod 203 and the rotating disk 205 make line contact using rotating rollers on the adjusting rod. A limiting block 204 is installed between the base plate 202 and the adjusting rod 203. When the flow regulating device reaches its maximum regulating capacity, the limiting block 204 restricts the maximum displacement of the adjusting rod 203 to prevent damage to the regulating device. There is one front flange pipe 1 and one rear flange pipe, and the adjustable orifice plate assembly 2-1 consists of three or more pieces. The axial adjustment ring 2-2 is made of polytetrafluoroethylene (PTFE), a compressible material used to adjust axial installation errors and pre-tighten to prevent axial movement of the adjustable orifice plate assembly 2-1 during operation. The sealing cover 201 engages with the support sleeve 2-2 using locating pins 204 to prevent rotational movement during use.

[0054] Example 2

[0055] The adjustable multi-stage throttling device is installed in the system pipeline, allowing the working medium in the pipeline to flow along the throttling window of the adjustable orifice plate assembly. During use, according to different working flow requirements, the position of the adjusting rod in the throttling window is adjusted by controlling the rotation direction and angle of the actuator in the adjustable orifice plate assembly, thereby changing the effective throttling area of ​​the flow regulating component and achieving precise flow regulation under different operating conditions.

[0056] In the pressure reduction and throttling operation of the multi-stage orifice plate device, when the output flow rate is lower than the target flow rate, it is necessary to increase the effective throttling area. A flow regulation signal is issued, and the driver rotates forward, causing the rotating disk to rotate clockwise. This causes the rotating wheel, which is in line contact with the rotating disk, to move the adjusting rod towards the axis closer to the base plate, thereby uniformly increasing the effective throttling area of ​​each throttling window of the adjustable orifice plate assembly and increasing the output flow rate. Figure 3(a) shows the adjustable orifice plate assembly at its maximum throttling area, meaning the adjusting rod is not in the throttling window. When the output flow rate is higher than the target flow rate, it is necessary to reduce the effective throttling area. A flow regulation signal is issued, and the driver rotates in the opposite direction, causing the rotating disk to rotate counterclockwise. This causes the rotating wheel, which is in line contact with the rotating disk, to move the adjusting rod away from the axis away from the base plate, thereby uniformly reducing the effective throttling area of ​​each throttling window of the adjustable orifice plate assembly and reducing the output flow rate. Figure 3(b) shows the adjustable orifice plate assembly at its minimum throttling area, meaning the adjusting rod passes through the throttling window.

[0057] Furthermore, in order to reduce pressure pulsation caused by uneven flow during throttling in the multi-stage orifice plate device, four throttling windows with the same throttling area are evenly distributed on the adjustable orifice plate assembly. The area of ​​the throttling windows increases or decreases uniformly during flow regulation. At the same time, the throttling window area of ​​the multi-stage adjustable orifice plate assembly gradually increases from left to right, thereby further reducing flow noise and cavitation during the throttling process through step-by-step pressure reduction.

[0058] This invention, a flow-adjustable multi-stage throttling device, focuses on achieving low-noise flow regulation under all operating conditions. Regardless of the operating condition, the same number of orifice plates are used. By uniformly adjusting the throttling window area on each orifice plate, multi-stage stable pressure reduction is achieved, thereby meeting the requirement of low-noise flow control.

[0059] Firstly, a multi-stage pressure reduction structure is adopted; secondly, through effective structural design, low vibration and air noise performance can be achieved while realizing flow regulation. Taking a three-stage structure as an example, multiple throttling windows are opened on each orifice plate. By rotating the actuator, the rotating disk is driven to rotate, realizing the synchronous and uniform adjustment of the effective throttling area of ​​the adjustable orifice plate. This method of realizing multi-stage unified flow regulation is relatively novel and has a low noise level during regulation.

[0060] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-stage flow-adjustable throttling device, characterized in that, include: A front flange pipe (1), a flow regulating component (2), and a rear flange pipe (3) are fastened together. The flow regulating component (2) includes multiple adjustable orifice plate assemblies (2-1), which are arranged in the inner cavity of the flange pipe formed by the front flange pipe (1) and the rear flange pipe (3). Each adjustable orifice plate assembly (2-1) includes a sealing cover plate (201), a base plate (202), an adjusting rod (203), a rotating disk (205), and a driver (208). The adjusting rod (203) is arranged in a mounting hole in the base plate (202), and the rotating disk (205) is mounted on the base plate (202). The driver (208) is mounted on the sealing cover plate (201). The throttling hole of the sealing cover plate (201) and the throttling hole of the base plate (202) are connected to form a throttling window. The rotating disk (205) is connected to the adjusting rod (203) through a rotating wheel. The driver (208) is used to drive the rotating disk (205) to rotate during rotation. The rotating disk (205) is used to drive the adjusting rod (203) to enter or exit the throttling window through the rotating wheel, thereby changing the effective throttling area of ​​the throttling window. Along the direction from the fluid inlet to the fluid outlet, the total area of ​​the throttling windows in the plurality of adjustable orifice plate assemblies (2-1) gradually increases. The way in which the total area of ​​the throttling window gradually increases is as follows: along Along the fluid inlet to fluid outlet direction, the area of ​​a single throttling window in each adjustable orifice plate assembly (2-1) is equal, and the number of throttling windows in multiple adjustable orifice plate assemblies (2-1) gradually increases, resulting in a gradual increase in the total area of ​​the throttling windows in multiple adjustable orifice plate assemblies (2-1); or, the number of throttling windows in each adjustable orifice plate assembly (2-1) is equal, and along the fluid inlet to fluid outlet direction, the area of ​​the throttling windows in multiple adjustable orifice plate assemblies (2-1) gradually increases, resulting in a gradual increase in the total area of ​​the throttling windows in multiple adjustable orifice plate assemblies (2-1); or, both the number and area of ​​throttling windows in each adjustable orifice plate assembly (2-1) change, ultimately... Along the direction from the fluid inlet to the fluid outlet, the product of the throttling window area and the number of multiple adjustable orifice plate assemblies (2-1) gradually increases; the device is used to regulate the flow rate of the fluid in the pipeline, and the fluid in the pipeline flows along the throttling window of the sealing cover plate (201); when the output flow rate is lower than the target flow rate, the driver (208) rotates in the forward direction, driving the rotating disk (205) to rotate clockwise, so that the rotating wheel in line contact with the rotating disk (205) drives the adjusting rod (203) to move towards the axis closer to the bottom plate (202), thereby increasing the effective throttling window area of ​​the sealing cover plate (201) and increasing the output flow rate; when the output flow rate meets the target requirement, the operation of the driver (208) is stopped;When the output flow rate is higher than the target flow rate, the driver (208) rotates in the reverse direction, causing the rotating disk (205) to rotate counterclockwise. This causes the rotating wheel, which is in line contact with the rotating disk (205), to move the adjusting rod (203) away from the axis of the base plate (202), thereby reducing the effective throttling window area of ​​the sealing cover plate (201) and lowering the output flow rate.

2. The flow-adjustable multi-stage throttling device as described in claim 1, characterized in that, The adjustable perforated plate assembly (2-1) further includes a limiting block (204), which is installed between the base plate (202) and the adjusting rod (203).

3. The flow-adjustable multi-stage throttling device as described in claim 1, characterized in that, The flow regulating component (2) further includes: a support sleeve (2-2), an axial adjustment ring (2-3), and a positioning pin (2-4). Each adjustable orifice plate assembly (2-1) is fixed in the positioning pin hole in the front flange pipe (1) and the rear flange pipe (3) by the positioning pin (2-4). The support sleeve (2-2) is located between adjacent adjustable orifice plate assemblies (2-1), and the axial adjustment ring (2-3) is located between the support sleeve (2-2) and the adjustable orifice plate assembly (2-1).

4. The flow-adjustable multi-stage throttling device as described in claim 3, characterized in that, The number of positioning pins (2-4) is multiple. Some positioning pins (2-4) are used to fix the adjustable orifice plate assembly (2-1), and some positioning pins (2-4) are fixed in the positioning pin holes that cooperate with the sealing cover plate (201) and the support sleeve (2-2).

5. A flow-adjustable multi-stage throttling device as described in any one of claims 1-3, characterized in that, The adjustable orifice plate assembly (2-1) further includes: a first sealing ring (206) and a second sealing ring (207), wherein the first sealing ring (206) is arranged in the groove on the outer wall of the adjusting rod (203), and the second sealing ring (207) is arranged on the mating surface of the sealing cover plate (201) and the base plate (202).

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