Flow control device with linearly adjustable flow area

Abstract

The application provides a flow control device with linearly adjustable flow area, comprising an inner sleeve assembly, an intermediate sleeve assembly and an outer sleeve assembly, the intermediate sleeve assembly is sleeved outside the inner sleeve assembly, the outer sleeve assembly is sleeved outside the intermediate sleeve assembly, the intermediate sleeve assembly can axially slide with the inner sleeve assembly and the outer sleeve assembly, a plurality of flow gap segments are arranged on the end wall of the inner sleeve assembly inside the intermediate sleeve assembly, the outer circumferential surface of the flow gap segment and the inner wall surface of the intermediate sleeve assembly constitute two sections of flowable and non-flowable by means of the third sealing ring arranged on the inner wall surface of the intermediate sleeve assembly; the end of the intermediate sleeve assembly away from the flow gap segment is provided with the second sealing ring between the intermediate sleeve assembly and the inner sleeve assembly, and the fourth sealing ring is arranged between the intermediate sleeve assembly and the outer sleeve assembly. The application can make the stroke and the flow area completely linear, and is easy to manufacture and install, low in cost, good in universality, long in service life and capable of satisfying the accurate control of flow.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, in particular to a flow control device with linearly adjustable flow area. Background Art

[0002] Flow regulation and control are important and indispensable key technologies in many fields such as fluid machinery, hydraulic machinery, and water meter measurement and calibration. Among the many factors affecting flow, the flow area has a direct impact on the controlled stroke. The spherical, V-shaped, double V-shaped flow control valves that are widely used now cannot achieve a linear relationship between the controlled stroke and the flow area, resulting in a large difference in the change in the flow area when the controlled stroke changes. The flow control accuracy is low and the stability is poor. Although irregular valves that are approximately elliptical can approximately achieve an approximate linear relationship between the flow area and the controlled stroke, they have high manufacturing costs, poor versatility, and a short lifespan, and cannot be promoted for use. Summary of the Invention

[0003] The purpose of the present invention is to provide a flow control device with linearly adjustable flow area, which can make the controlled stroke and flow area completely linear, and is easy to manufacture and install, low cost, good versatility, long life, and can meet the needs of precise flow control.

[0004] According to the purpose of the present invention, the present invention provides a flow control device with linearly adjustable flow area, comprising an inner sleeve assembly, an intermediate sleeve assembly and an outer sleeve assembly, the intermediate sleeve assembly being sleeved on the outside of the inner sleeve assembly, the outer sleeve assembly being sleeved on the outside of the intermediate sleeve assembly, the intermediate sleeve assembly and the inner sleeve assembly and the outer sleeve assembly being axially slidable relative to each other, the inner sleeve assembly being located on one end of the cylinder wall of the intermediate sleeve assembly and having a plurality of flow gap sections, the outer circumferential surface entity of the flow gap section and the inner wall surface of the intermediate sleeve assembly being formed into two sections, one which can flow and the other which cannot flow, with the aid of a third sealing ring installed on the inner wall surface of the intermediate sleeve assembly, a second sealing ring being provided between an end of the intermediate sleeve assembly away from the flow gap section and the inner sleeve assembly, and a fourth sealing ring being provided between the intermediate sleeve and the outer sleeve assembly.

[0005] Furthermore, during the axial relative sliding between the intermediate sleeve assembly and the inner sleeve assembly, the fluid flow area is linearly related to the axial movement of the intermediate sleeve assembly.

[0006] Furthermore, when the flow cross-section conditions such as fluid are met:

[0007] a) The sum of the angles between the two radial sides of the axial flow gap θ (unit: degree, θ = ∑θ i ,θ i(the angle between the two radial sides of a single flow gap), the inner diameter d of the inner sleeve flow gap, and the axial length L of the axial flow gap should meet the following requirements:

[0008]

[0009] b) The inner diameter D of the outer sleeve assembly, the outer diameter D1 of the intermediate sleeve assembly, and the inner diameter d of the inner sleeve flow should meet the following requirements:

[0010]

[0011] Furthermore, the inner sleeve assembly, the middle sleeve assembly and the outer sleeve assembly are all cylindrical structures.

[0012] Furthermore, the inner sleeve assembly includes an inner sleeve body, and one end of the inner sleeve body is fixedly connected to the liquid inlet pipe.

[0013] Furthermore, one end of the inner sleeve assembly located inside the middle sleeve assembly is a closed end, and a first sealing ring is provided on the outer circumferential surface of the inner sleeve assembly between the closed end of the inner sleeve assembly and the flow gap section.

[0014] Furthermore, the intermediate sleeve assembly is made of polytetrafluoroethylene material.

[0015] Furthermore, a first dust ring is provided between the inner sleeve assembly and one end of the intermediate sleeve assembly away from the flow gap section.

[0016] Furthermore, a piston boss is provided at the middle section of the intermediate sleeve assembly, and the piston boss is provided with the fourth sealing ring, which can prevent the liquid from flowing out through the gap between the outer circumferential surface of the intermediate sleeve assembly and the inner circumferential surface of the outer sleeve assembly.

[0017] Furthermore, the outer sleeve assembly is provided with a flange at one end away from the flow gap section of the inner sleeve assembly, and a second dust ring is installed at the joint between the inner hole of the flange and the middle sleeve assembly.

[0018] The technical solution of the present invention can make the controlled stroke and flow area completely linear. The device is easy to manufacture and install, has low cost, good versatility, and long service life, and can meet the requirements of precise flow control. With the gradual improvement of automation requirements, flow control has become a key technology for precise control in many cases. The flow control device with linear adjustment of flow area will surely be widely used in equipment in this field and can radiate to other industries, generating considerable economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of an inner sleeve assembly according to an embodiment of the present invention;

[0022] Figure 3 For the embodiment of the present invention Figure 2 Cross-section of the middle BB;

[0023] Figure 4 This is a schematic structural diagram of an intermediate sleeve assembly according to an embodiment of the present invention;

[0024] Figure 5 For the embodiment of the present invention Figure 4 A partial enlarged view of point A in the middle;

[0025] Figure 6 For the embodiment of the present invention Figure 4 A partial enlarged view of point B in the middle;

[0026] Figure 7 This is a schematic structural diagram of an outer sleeve assembly according to an embodiment of the present invention;

[0027] Description of reference numerals:

[0028] In the figure, 1-inner sleeve assembly, 2-middle sleeve assembly, 3-outer sleeve assembly, 4-main water inlet, 5-inner sleeve body, 6-flow gap section, 7-first sealing ring, 8-left end cylinder, 9-piston boss, 10-third sealing ring, 11-first dust ring, 12-second sealing ring, 13-fourth sealing ring, 14-second dust ring, 15-flange, 16-main liquid outlet. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0032] Example 1

[0033] like Figure 1-Figure 7 As shown:

[0034] A flow control device with linearly adjustable flow area includes an inner sleeve assembly 1, an intermediate sleeve assembly 2 and an outer sleeve assembly 3. The inner sleeve assembly 1, the intermediate sleeve assembly 2 and the outer sleeve assembly 3 are all cylindrical structures; the intermediate sleeve assembly 2 is sleeved on the outside of the inner sleeve assembly 1, and the outer sleeve assembly 3 is sleeved on the outside of the intermediate sleeve assembly 2.

[0035] The inner sleeve assembly 1 includes an inner sleeve body 5, a total water inlet 4 at the left end of the inner sleeve body 5 is fixedly connected to the liquid inlet pipe, and a plurality of flow gap sections 6 are provided on the wall of the other end of the inner sleeve body 5. The outer circumferential surface of the flow gap section 6 and the inner wall surface of the intermediate sleeve assembly 2 are connected with the third sealing ring 10 installed on the inner wall surface of the intermediate sleeve assembly 2 to form two sections, one for flow and the other for flow not. The sizes of the two sections change with the axial relative movement of the intermediate sleeve assembly 2 and the inner sleeve assembly 1. During the change, the fluid flow area is linearly related to the axial movement of the controlled intermediate sleeve assembly 2.

[0036] As the intermediate sleeve assembly 2 and the inner sleeve assembly 1 move, the sizes of the two sections mentioned above change. During the change, the fluid flow area is always linearly related to the axial movement of the controlled intermediate sleeve assembly 2. When the fluid flow section conditions are met:

[0037] 1) The sum of the angles between the two radial sides of the axial flow gap θ (unit: degree, θ = ∑θ i ,θ i The angle between the two radial sides of a single flow gap), the inner diameter d of the inner sleeve flow gap, and the axial length L of the axial flow gap should meet the following requirements:

[0038]

[0039] 2) The inner diameter D of the outer sleeve assembly, the outer diameter D1 of the intermediate sleeve assembly, and the inner diameter d of the inner sleeve flow should meet the following requirements:

[0040]

[0041] Liquid flows into the inner sleeve assembly 1 through the main water inlet 4, passes through the right side of the third sealing ring 10, flows into the inner cavity of the outer sleeve assembly 3 through the flow gap section 6, and finally flows out of the main liquid outlet 16 of the outer sleeve assembly 3. Except for the flow gap section 6, the other shaft sections of the inner sleeve assembly 1 are all sealed, and the right end of the inner sleeve assembly 1 is closed. A sealing notch is provided on the outer circumference of the inner sleeve assembly 1 between the closed end and the flow gap section 6, which is suitable for installing the first sealing ring 7. The inner surface of the right end of the middle sleeve assembly 2 presses against the first sealing ring 7 to achieve liquid flow cutoff.

[0042] The intermediate sleeve assembly 2, except for the sealing ring and dust ring, is made of polytetrafluoroethylene. The inner surface of the left end cylinder 8 of the intermediate sleeve assembly 2, which cooperates with the inner sleeve assembly 1, is provided with two notches for installing the dust ring and the sealing ring. The inner notch is installed with a second sealing ring 12, and the outer notch is installed with a first dust ring 11. The second sealing ring 12 prevents the liquid flow from flowing out of the flow gap section 6 of the inner sleeve assembly 1 through the annular gap between the inner sleeve assembly 1 and the intermediate sleeve assembly 2. The first dust ring 11 prevents external dust from entering the controlled liquid flow.

[0043] A notch for installing a sealing ring is provided on the inner hole surface of the right side of the intermediate sleeve assembly 2 that matches the inner sleeve assembly 1, and a third sealing ring 10 is installed. The third sealing ring 10 can prevent the liquid from flowing out of the gap between the inner sleeve assembly 1 and the intermediate sleeve assembly 2;

[0044] A piston boss 9 is provided near the middle of the intermediate sleeve assembly 2. A notch is provided on the piston boss 9 along the circumferential direction. A fourth sealing ring 13 is installed in the notch. The seal can prevent the liquid from flowing out through the gap between the outer circumferential surface of the intermediate sleeve assembly 2 and the inner circumferential surface of the outer sleeve assembly 3.

[0045] The outer sleeve assembly 3 is provided with a flange 15 at the left end close to the inner sleeve assembly 1, and the outer sleeve assembly 3 is fixedly connected with external equipment through the flange 15. A second dustproof ring 14 is arranged at the cooperation position of the inner hole of the outer flange 15 and the middle sleeve assembly 2, so that dust cannot enter from the annular gap between the inner hole of the outer flange 15 and the middle sleeve assembly 2.

[0046] The application can make the stroke and the flow area completely linear, and the device is easy to manufacture and install, has low cost, good versatility, long service life, and can realize precise control of the flow area. With the gradual improvement of automation requirements, flow control has become a key technology for precise control in many cases. The flow control device with linear regulation of the flow area will be widely used in the field of equipment, and can be applied to other industries, producing considerable economic and social benefits.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A flow control device with linearly adjustable flow area, characterized in that: The invention comprises an inner sleeve assembly, an intermediate sleeve assembly and an outer sleeve assembly, wherein the intermediate sleeve assembly is sleeved on the outside of the inner sleeve assembly, and the outer sleeve assembly is sleeved on the outside of the intermediate sleeve assembly. The intermediate sleeve assembly and the inner sleeve assembly and the outer sleeve assembly can slide axially with each other, and the inner sleeve assembly is provided with a plurality of flow-through gap sections on the wall of one end of the cylinder located in the intermediate sleeve assembly. The outer circumferential surface entity of the flow-through gap section and the inner wall surface of the intermediate sleeve assembly are formed into two sections, one which can flow and the other which cannot flow, by means of a third sealing ring installed on the inner wall surface of the intermediate sleeve assembly. A second sealing ring is provided between the end of the intermediate sleeve assembly away from the flow-through gap section and the inner sleeve assembly, and a fourth sealing ring is provided between the intermediate sleeve and the outer sleeve assembly. ; During the axial sliding process between the intermediate sleeve assembly and the inner sleeve assembly, the fluid flow area is linearly related to the axial movement of the intermediate sleeve assembly; the end head of the inner sleeve assembly located in the intermediate sleeve assembly is a closed end, and a first sealing ring is provided on the outer circumferential surface of the inner sleeve assembly between the closed end of the inner sleeve assembly and the flow gap section; a first dust ring is also provided between the end of the intermediate sleeve assembly away from the flow gap section and the inner sleeve assembly; a piston boss is provided at the middle position of the intermediate sleeve assembly, and the piston boss is provided with the fourth sealing ring, and the fourth sealing ring can prevent the liquid from flowing out through the gap between the outer circumferential surface of the intermediate sleeve assembly and the inner circumferential surface of the outer sleeve assembly; when the fluid flow section condition is met: a) The sum of the angles between the two radial sides of the axial flow gap, θ, , The angle between the two radial sides of a single flow gap, the inner diameter d of the inner sleeve, and the axial length L of the axial flow gap should meet the following requirements: ； b) The inner diameter D of the outer sleeve assembly, the outer diameter D1 of the intermediate sleeve assembly, and the inner diameter d of the inner sleeve flow should meet the following requirements: 。 2. The flow control device with linearly adjustable flow area according to claim 1, characterized in that: The inner sleeve assembly, the middle sleeve assembly and the outer sleeve assembly are all cylindrical structures.

3. The flow control device with linearly adjustable flow area according to claim 1, characterized in that: The inner sleeve assembly comprises an inner sleeve body, one end of which is fixedly connected to the liquid inlet pipe.

4. The flow control device with linearly adjustable flow area according to claim 1, characterized in that: The middle sleeve assembly is made of polytetrafluoroethylene material.

5. The flow control device with linearly adjustable flow area according to claim 1, characterized in that: The outer sleeve assembly is provided with a flange at one end away from the flow gap section of the inner sleeve assembly, and a second dust ring is installed at the joint between the inner hole of the flange and the middle sleeve assembly.

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