CN112815174A

CN112815174A - Adjustable throttling device

Info

Publication number: CN112815174A
Application number: CN202110198061.3A
Authority: CN
Inventors: 杨明; 芦洪钟; 唐钧; 侯多华; 彭耀
Original assignee: Shanghai Kaiquan Pump Group Co Ltd
Current assignee: Shanghai Kaiquan Pump Group Co Ltd
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-05-18

Abstract

The invention relates to an adjustable throttling device, which comprises an outer sleeve, a plurality of first inner core columns, a second inner core column, a third inner core column, a limiting snap ring, a limiting rib and a limiting snap ring, wherein the first inner core columns, the second inner core columns and the third inner core columns are in a plurality; the first inner core column, the second inner core column and the third inner core column in a plurality of numbers are sequentially and axially fixedly connected through the positioning bosses and the positioning grooves, and are axially positioned through the outer sleeve and the limiting ribs and the limiting snap rings on the outer sleeve. The outer diameter of the second inner core column is smaller than that of the first inner core column, the third inner core column comprises an opening cylindrical part and a hollow cylindrical part, and the outer diameter of the hollow cylindrical part is larger than that of the opening cylindrical part. According to the invention, when the pressure reduction requirement is changed, redesign is not needed, and the number of the first inner core columns is determined and selected, the diameter of the outer cylinder of the second inner core column and the number and the diameter of the holes of the throttling holes on the third inner core column are determined by simple calculation, so that the aim of recycling the device is fulfilled.

Description

Adjustable throttling device

Technical Field

The invention relates to a throttling device, in particular to an adjustable throttling device which does not need to be redesigned when the requirement of pressure reduction is changed, only needs simple calculation to determine and select the number of first inner core columns, and determine the diameter of the outer cylinder of a second inner core column and the number and the diameter of holes of a throttling hole on a third inner core column, thereby achieving the purpose of recycling the device.

Background

At present, the traditional throttling orifice plate flowmeter is designed aiming at specific working conditions, when the working conditions are changed, a replacing device needs to be redesigned, the step-type pressure drop is easy to occur, and the cavitation phenomenon is easy to generate; impurities are easy to deposit in the pore plate; outlet flow field disorder, etc.

Disclosure of Invention

In view of the above problems, the main object of the present invention is to provide an adjustable throttling device, which does not need to be redesigned when the pressure reduction requirement changes, and only needs to determine and select the number of first inner core columns and determine the outer cylindrical diameter of the second inner core column and the number and the diameter of the orifices on the third inner core column by simple calculation, so as to achieve the purpose of recycling the device.

The invention solves the technical problems through the following technical scheme: an adjustable flow restriction device, comprising: the outer sleeve comprises a plurality of first inner core columns, a second inner core column, a third inner core column, a limiting snap ring, a limiting rib and a limiting snap ring; the first inner core column, the second inner core column and the third inner core column in a plurality of numbers are sequentially and axially fixedly connected through the positioning bosses and the positioning grooves, and are axially positioned through the outer sleeve and the limiting ribs and the limiting snap rings on the outer sleeve.

In a specific example embodiment of the present invention, the second inner leg has an outer diameter less than the outer diameter of the first inner leg, the third inner leg includes an open cylindrical portion and a hollow cylindrical portion, the outer diameter of the hollow cylindrical portion is greater than the outer diameter of the open cylindrical portion, and the outer diameter of the open cylindrical portion is less than the outer diameter of the second inner leg.

In a specific embodiment of the invention, the outer sleeve comprises an outer sleeve body, and the outer sleeve body is provided with a limiting rib, a limiting clamping groove and an outer flange; the limiting ribs and the limiting clamping grooves are located on the inner sides of the upper end and the lower end of the outer sleeve body, the outer flange is located on the outer sides of the upper end and the lower end of the outer sleeve body, and the limiting clamping rings are arranged in the limiting clamping grooves.

In a specific example embodiment of the present invention, each of the first inner legs includes: the first positioning boss, the annular throttling groove, the axial throttling groove and the first positioning groove are arranged on the first positioning boss; the first positioning bosses and the first positioning grooves are distributed at the upper end and the lower end of the first inner core column, the annular throttling groove radially surrounds the first inner core column, the axial throttling groove is axially arranged on the first inner core column, and the annular throttling groove is communicated with the axial throttling groove.

In a specific embodiment of the present invention, the second inner leg includes: the second positioning boss, the cylindrical surface and the second positioning groove; the second positioning boss is butted with the first positioning groove of the first inner core column, and the second positioning groove is butted with the positioning boss on the third inner core column; the second positioning boss, the cylindrical surface and the second positioning groove are integrally formed.

In a specific embodiment of the present invention, the third inner leg includes a plurality of radial orifices; the radial throttle hole is provided on the split cylindrical portion.

In a specific embodiment of the present invention, the outer diameter of the second inner stem is 4/5-9/10 of the inner diameter of the outer sleeve.

In the specific implementation example of the invention, the inner diameter of the radial throttling hole is 3/10-2/5 of the inner diameter of the inner core of the third inner core column, and the number of the radial throttling hole is 4-6.

In the embodiment of the invention, the inlet and the outlet of the outer sleeve are connected by flanges.

The positive progress effects of the invention are as follows: the adjustable throttling device provided by the invention has the following advantages:

(1) one set of throttling arrangement need not redesign when pressure reduction demand changes, only need through simple calculation, confirms to select 1 quantity of stem in the first to and confirm 2 outer cylinder diameters of stem in the second and its hole quantity and aperture of orifice on the stem 3 in the third, reach one set of device reuse purpose.

(2) The annular flow passage is used for leading the fluid to move forwards in the flow passage under the action of centrifugal force, and the pressure is gradually reduced, so that the step-type pressure reduction of the fluid in the orifice plate flowmeter is avoided, and the cavitation phenomenon can be effectively avoided;

(3) the annular groove medium composed of the first inner core columns 1 moves circularly, so that the axial length can be reduced when the purpose of reducing pressure is achieved, and the pressure drop can be controlled and adjusted by selecting the number of the annular groove medium.

(4) The inner diameter of the outer sleeve is fixed, and the clearance between the outer sleeve and the outer sleeve is adjusted by adjusting the diameter of the outer circle of the second inner core column 2, so that the pressure drop of the section can be controlled and adjusted.

(5) And the number and the aperture of the throttling holes on the third inner core column 3 are different in diameter and number according to requirements, so that the pressure drop is controllable and adjustable.

(6) The fluid basically does not flow back after flowing through the annular throttling device, the defect of disordered flow field at the outlet of the orifice plate flowmeter is overcome, and the scaling condition at the rear end of the flowmeter can be effectively improved, so that the service life of the flowmeter is prolonged.

(7) The device has simple structure, and is easy to disassemble, assemble and clean.

Drawings

Fig. 1 is a schematic structural view of an outer sleeve according to the present invention.

Fig. 2-1 is an exploded view of an alternative construction of the present invention with the outer casing removed.

Fig. 2-2 is a schematic view of the assembled structure of fig. 2-1.

Fig. 2-3 is a longitudinal sectional view of fig. 2-1.

Fig. 2-4 are longitudinal cross-sectional views of fig. 2-2.

Fig. 3 is a schematic view of the structure of the present invention showing the flow direction of fluid.

The following are the names corresponding to the reference numbers in the invention:

the core comprises a first inner core column 1, a second inner core column 2, a third inner core column 3, an outer sleeve 4, a limiting snap ring 5, a limiting rib 6, a limiting clamping groove 7, an outer flange 8 and an outer sleeve body 9;

the positioning structure comprises a first positioning boss 101, an annular throttling groove 102, an axial throttling groove 103 and a first positioning groove 104;

a second positioning boss 201, a cylindrical surface 202 and a second positioning groove 203;

an open cylindrical portion 301, a hollow cylindrical portion 302, a radial orifice 303.

Detailed Description

The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an outer sleeve according to the present invention, fig. 2-1 is an exploded view of another construction according to the present invention after the outer sleeve is removed, fig. 2-2 is a schematic structural view after the assembly of fig. 2-1 is completed, fig. 2-3 is a longitudinal sectional view of fig. 2-1, fig. 2-4 is a longitudinal sectional view of fig. 2-2, and fig. 3 is a schematic structural view of a fluid flow direction according to the present invention. As shown in the above figures: the invention provides an adjustable throttling device, which comprises: the outer sleeve 4, a plurality of first inner core columns 1, a second inner core column 2, a third inner core column 3, a limiting snap ring 5 and a limiting rib 6; the first inner core column 1, the second inner core column 2 and the third inner core column 3 in a plurality of numbers are sequentially and axially fixedly connected through a positioning boss and a positioning groove, and then are axially positioned through the outer sleeve 4, a limiting rib 6 on the outer sleeve and a limiting clamping ring 5.

The outer diameter of the second inner leg 2 is smaller than the outer diameter of the first inner leg 1, the third inner leg 3 comprises an open cylindrical portion 301 and an inner hollow cylindrical portion 302, the outer diameter of the inner hollow cylindrical portion 302 is larger than the outer diameter of the open cylindrical portion 301, and the outer diameter of the open cylindrical portion 301 is smaller than the outer diameter of the second inner leg 2.

The outer sleeve 4 comprises an outer sleeve body 9, and the outer sleeve body 9 is provided with a limiting rib 6, a limiting clamping groove 7 and an outer flange 8; the limiting ribs 6 and the limiting clamping grooves 7 are located on the inner sides of the upper end and the lower end of the outer sleeve body 9, the outer flange 8 is located on the outer sides of the upper end and the lower end of the outer sleeve body 10, and the limiting clamping rings 5 are arranged in the limiting clamping grooves 7.

Each first inner leg 1 includes: the positioning structure comprises a first positioning boss 101, an annular throttling groove 102, an axial throttling groove 103 and a first positioning groove 104; the first positioning bosses 101 and the first positioning grooves 104 are distributed at the upper end and the lower end of the first inner core column 1, the annular throttling groove 102 radially surrounds the first inner core column 1, the axial throttling groove 103 is axially arranged on the first inner core column 1, and the annular throttling groove 102 is communicated with the axial throttling groove 103.

The second inner leg 2 includes: a second positioning boss 201, a cylindrical surface 202 and a second positioning groove 203; the second positioning boss is butted with the first positioning groove 104 of the first inner core column 1, and the second positioning groove is butted with the positioning boss on the third inner core column 3; the second positioning boss 201, the cylindrical surface 202 and the second positioning groove 203 are integrally formed.

The third inner leg 3 comprises a number of radial orifices 303; a radial throttle hole 303 is provided on the open cylindrical portion 301.

In a specific implementation, the outer diameter of the second inner stem 2 is 4/5-9/10 of the inner diameter of the outer sleeve 4. The inner diameter of the radial throttling hole 303 is 3/10-2/5 of the inner diameter of the inner core of the third inner core column 3, and the number of the radial throttling holes is 4-6. The above parameters may be selected from other parameters or ranges according to specific requirements.

In a specific implementation process, the inlet and the outlet of the outer sleeve 4 are connected by flanges.

In the specific implementation process of the invention, when the pressure reduction requirement changes, redesign is not needed, and only simple calculation is needed to determine and select the number of the first inner core columns 1, and determine the outer cylindrical diameter of the second inner core column 2 and the hole number and the hole diameter of the throttling holes on the third inner core column 3 (namely, the variable of adjustment is the number of the first inner core columns 1, the outer cylindrical diameter of the second inner core column 2 and the diameter and the number of the throttling holes on the third inner core column 3), so that the requirements of different application occasions are met, and the aim of recycling the device is fulfilled.

The first inner core column 1, the second inner core column 2 and the third inner core column 3 are connected in series through the concave bosses to form an inner core, and the inner core is positioned with the limiting ribs and the limiting snap rings on the outer sleeve.

Fig. 3 is a schematic view of the structure of the present invention showing the flow direction of fluid. As shown in fig. 3: the black arrows indicate the liquid medium flow direction. The high-pressure liquid medium flows in from the inlet of the throttling device flange, can only pass through the annular throttling groove of the first inner core column 1, then passes through the annular column gap between the excircle of the second inner core column 2 and the outer sleeve, reaches the third inner core column 3, passes through a plurality of throttling holes on the third inner core column, and finally flows out from the outlet flange of the throttling device, so that the purpose of reducing the pressure of the liquid medium from high pressure to low pressure is fulfilled.

According to the set of throttling device provided by the invention, when the pressure reduction requirement is changed, redesign is not needed, and the number of the first inner core columns 1 is determined and selected, the outer cylinder diameter of the second inner core column 2 and the hole number and the hole diameter of the throttling hole on the third inner core column 3 are determined through simple calculation, so that the aim of recycling the set of throttling device is fulfilled.

According to the annular flow passage, fluid moves forwards in the flow passage under the action of centrifugal force, the pressure is gradually reduced, the step-type pressure reduction of the fluid in the orifice plate flowmeter is avoided, and the cavitation phenomenon can be effectively avoided; the annular groove medium composed of a plurality of first inner core columns 1 does circular motion, so that the purpose of reducing pressure is achieved, the axial length can be reduced, and meanwhile, the number can be selected, so that the pressure drop is controllable and adjustable.

The inner diameter of the outer sleeve pipe is fixed, and the clearance between the outer sleeve pipe and the second inner core column 2 is adjusted by adjusting the diameter of the outer circle of the second inner core column, so that the pressure drop of the section can be controlled and adjusted.

And the number and the aperture of the throttling holes on the third inner core column 3 are different in diameter and number according to requirements, so that the pressure drop is controllable and adjustable.

The fluid basically does not flow back after flowing through the annular throttling device, the defect of disordered flow field at the outlet of the orifice plate flowmeter is overcome, and the scaling condition at the rear end of the flowmeter can be effectively improved, so that the service life of the flowmeter is prolonged.

The device has simple structure, and is easy to disassemble, assemble and clean.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.

Claims

1. An adjustable throttling device, characterized in that: the adjustable throttle device comprises: the outer sleeve comprises a plurality of first inner core columns, a second inner core column, a third inner core column, a limiting snap ring, a limiting rib and a limiting snap ring; the first inner core column, the second inner core column and the third inner core column in a plurality of numbers are sequentially and axially fixedly connected through the positioning bosses and the positioning grooves, and are axially positioned through the outer sleeve and the limiting ribs and the limiting snap rings on the outer sleeve.

2. The adjustable restriction device according to claim 1, wherein: the outer diameter of the second inner core column is smaller than that of the first inner core column, the third inner core column comprises an opening cylindrical part and a hollow cylindrical part, the outer diameter of the hollow cylindrical part is larger than that of the opening cylindrical part, and the outer diameter of the opening cylindrical part is smaller than that of the second inner core column.

3. The adjustable restriction device according to claim 1, wherein: the outer sleeve comprises an outer sleeve body, and a limiting rib, a limiting clamping groove and an outer flange are arranged on the outer sleeve body; the limiting ribs and the limiting clamping grooves are located on the inner sides of the upper end and the lower end of the outer sleeve body, the outer flange is located on the outer sides of the upper end and the lower end of the outer sleeve body, and the limiting clamping rings are arranged in the limiting clamping grooves.

4. The adjustable restriction device according to claim 1, wherein: each first inner leg includes: the first positioning boss, the annular throttling groove, the axial throttling groove and the first positioning groove are arranged on the first positioning boss; the first positioning bosses and the first positioning grooves are distributed at the upper end and the lower end of the first inner core column, the annular throttling groove radially surrounds the first inner core column, the axial throttling groove is axially arranged on the first inner core column, and the annular throttling groove is communicated with the axial throttling groove.

5. The adjustable restriction device according to claim 1, wherein: the second inner leg includes: the second positioning boss, the cylindrical surface and the second positioning groove; the second positioning boss is butted with the first positioning groove of the first inner core column, and the second positioning groove is butted with the positioning boss on the third inner core column; the second positioning boss, the cylindrical surface and the second positioning groove are integrally formed.

6. The adjustable throttle device of claim 2, wherein: the third inner leg comprises a plurality of radial orifices; the radial throttle hole is provided on the split cylindrical portion.

7. The adjustable restriction device according to claim 1, wherein: the outer diameter of the second inner core column is 4/5-9/10 of the inner diameter of the outer sleeve.

8. The adjustable restriction device according to claim 6, wherein: the inner diameter of the radial orifice is 3/10-2/5 of the inner diameter of the inner core of the third inner core column, and the number of the radial orifice is 4-6.

9. The adjustable restriction device according to claim 1, wherein: the inlet and outlet of the outer sleeve are connected by flanges.