A pressurized flexible throttle valve

Abstract

This invention discloses a pressurized flexible throttling valve, comprising a tube body and an air bladder. The air bladder is fixedly connected to the inner wall of the tube body, and the air bladder and the tube body enclose a pressurized cavity. A fluid channel is formed outside the air bladder. The air bladder has at least three expansion sealing parts distributed circumferentially and at equal intervals around the axis of the tube body. The expansion sealing parts are the portions of the air bladder that can squeeze and contact each other when pressurized and expanded to their maximum extent. A sealing protrusion extending towards the axis of the tube body is provided at the middle position of the expansion sealing parts. In this invention, the sealing protrusion located in the middle of the multiple expansion sealing parts squeezes and seals each other, thereby blocking the central gap formed by the multiple expansion sealing parts, thus eliminating the central gap and achieving complete sealing of the pressurized flexible throttling valve. At the same time, the middle position of the air bladder sealing part is thickened and reinforced to reduce elastic stress at this location, reduce material fatigue damage, and improve safety.

Description

Technical Field

[0001] This invention relates to a throttle valve, specifically a pressurized flexible throttle valve. Background Technology

[0002] The control medium for pressurized flexible throttle valves is compressed air or pressurized water. A pressurized flexible throttle valve is a control valve that uses the pressure of the control medium within the air chamber between the valve body and the rubber sleeve to deform and close the rubber sleeve, thus cutting off the fluid flow. Pressurized flexible throttle valves are particularly suitable for liquids, gases, or liquid-solid or gas-solid two-phase mixtures containing solid particles.

[0003] When a standard pressurized flexible throttle valve is open, there is no pressure inside the air chamber. Under the action of fluid pressure, the rubber sleeve is in an outward expansion state. The axial cross-section of the middle part of the rubber sleeve is circular, and the inner cavities of the left and right ends of the sleeve are interconnected, allowing fluid to flow through the pressurized flexible throttle valve. When the standard pressurized flexible throttle valve is closed, the pressure of the control medium inside the air chamber is greater than the fluid pressure inside the sleeve. The control medium pressure causes the middle part of the rubber sleeve to deform and close, folding and flattening the cross-section of the middle part of the rubber sleeve. The inner cavities of the left and right ends of the sleeve are no longer interconnected, and fluid cannot flow through the pressurized flexible throttle valve.

[0004] The existing pressurized flexible throttle valve has the following defects: 1. When the airbag is pressurized to close the pressurized flexible throttle valve, the maximum expansion point of the airbag has a certain curvature, which results in gaps between multiple expansion sealing parts, making it difficult to achieve a complete seal; 2. The maximum expansion point of the airbag has the greatest curvature and is subjected to the greatest elastic stress, which easily leads to material fatigue damage. Summary of the Invention

[0005] The purpose of this invention is to provide a pressurized flexible throttling valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A pressurized flexible throttling valve includes a tube body and an air bladder. The air bladder is fixedly connected to the inner wall of the tube body, and the air bladder and the tube body form a pressurized cavity. The air bladder forms a fluid channel. The air bladder has at least three expansion sealing parts that are circumferentially and equally spaced around the axis of the tube body. The expansion sealing parts are the parts that can squeeze and contact each other when the air bladder is pressurized and expanded to its maximum extent. A sealing protrusion extending toward the axis of the tube body is provided at the middle position of the expansion sealing part.

[0008] As a further aspect of the present invention, the sealing protrusion is integrally formed by thickening the middle position of the airbag's expansion sealing part.

[0009] As a further aspect of the present invention, the sealing protrusion is bonded and fixed to the middle position of the expansion sealing part by adhesive bonding.

[0010] As a further aspect of the present invention: the sealing protrusion is triangular in shape along the radial cross section of the pipe body, and the top of the triangular sealing protrusion forms a ridge parallel to the central axis of the pipe body.

[0011] As a further aspect of the present invention: the apex angle t of the triangular sealing protrusion satisfies:

[0012]

[0013] Where n is the number of sealing protrusions.

[0014] As a further aspect of the present invention: the airbag has grooves on both sides in the width direction of the sealing protrusion, the two ends of the grooves extend along the edge of the sealing protrusion, and the two sides of the sealing protrusion are connected within the groove range.

[0015] As a further aspect of the present invention, the groove is formed on the inner or outer side wall of the airbag.

[0016] As a further aspect of the present invention, the design parameters of the airbag along the axial section of the tube body satisfy the following conditions:

[0017]

[0018]

[0019]

[0020]

[0021] L0 is the axial distance between the two sides of the airbag; L1 is the axial width of the sealing protrusion; L2 is the axial distance from the outer side of the groove to the sealing protrusion; L3 is the axial distance from the outer side of the airbag to the outer side of the groove.

[0022] As a further aspect of the present invention: the airbag has a cylindrical structure, and both ends of the airbag are fixedly connected to the inner wall of the tube.

[0023] As a further aspect of the present invention: the airbag has a hemispherical structure, and the expansion sealing part corresponds one-to-one with the hemispherical airbag.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The pressurized flexible throttle valve of the present invention has a sealing protrusion extending toward the axis of the tube body at the middle position of the expansion sealing part of the airbag. When the airbag is pressurized to the maximum extent and the pressurized flexible throttle valve is in the closed state, the sealing protrusion located in the middle of the multiple expansion sealing parts squeezes and seals each other, thereby blocking the central gap formed by the multiple expansion sealing parts and eliminating the central gap, so as to achieve complete sealing of the pressurized flexible throttle valve. At the same time, the middle position of the airbag sealing part is thickened and reinforced to reduce the elastic stress at this position, reduce material fatigue damage, and improve safety.

[0026] 2. By setting the sealing protrusion to have a triangular cross-section, the top of the triangular sealing protrusion forms a ridge parallel to the central axis of the pipe body. When the throttle valve is closed, the ridge of each sealing protrusion coincides with the central axis of the pipe body, thereby enhancing the fit between the sealing protrusions and further eliminating gaps.

[0027] 3. By providing grooves on both sides of the sealing protrusion in the width direction on the airbag, with the two ends of the grooves extending along the edge of the sealing protrusion, and the two sides of the sealing protrusion connected within the groove range, the thickness of the airbag at the groove is less than the thickness of other parts. When the airbag expands to its maximum extent, the expansion amplitude of the thin-walled part at the groove is greater than that of the rest, forming two expansion protrusions located on both sides of the sealing protrusion, thereby providing greater elastic extrusion force to both sides of the sealing protrusion, so that the sealing protrusion further pressurizes and contacts on both sides along the axial direction of the tube, thus ensuring a better tight connection between multiple sealing protrusions. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the radial cross-section of the pressurized flexible throttle valve in Example 1;

[0029] Figure 2 This is a schematic diagram of the axial cross-section of the pressurized flexible throttle valve in Example 1;

[0030] Figure 3 This is a schematic diagram of the axial cross-section of the pressurized flexible throttle valve in the sealed state in Example 1;

[0031] Figure 4 for Figure 3 Enlarged view of part A;

[0032] Figure 5 This is a schematic diagram of the pressurized flexible throttle valve in its sealed state in Example 1;

[0033] Figure 6 This is a cross-sectional view of the pressurized flexible throttle valve in its natural state in Example 1;

[0034] Figure 7This is a schematic diagram of the radial cross-section of the pressurized flexible throttle valve in Example 2;

[0035] In the figure: 1. Pipe body; 2. Air bladder; 2a. Expansion sealing part; 2b. Groove; 3. Sealing protrusion; 3a. Pressurization chamber; 4. Fluid channel; 5. Detailed Implementation

[0036] To explain in detail the technical content, structural features, objectives, and effects of the technical solution, the following description is provided in conjunction with specific embodiments and accompanying drawings.

[0037] Example 1

[0038] Please see Figure 1 In this embodiment, a pressurized flexible throttling valve includes a tube body 1 and an air bladder 2. The air bladder 2 has a cylindrical structure, and its two ends are fixedly connected to the inner wall of the tube body 1. The air bladder 2 and the tube body 1 enclose a pressurization chamber 4, and the air bladder 2 encloses a fluid channel 5. An interface (not shown in the figure) is provided on the pressurization chamber 4. The pressurizing medium is injected into the air bladder 2 through the interface, making the internal pressure of the air bladder 2 greater than the external pressure. The air bladder 2 expands and reduces the cross-sectional area of ​​the fluid channel 5, thereby limiting the flow. When the air bladder 2 expands to its maximum extent, the expansion sealing parts 2a of the air bladder 2 press against each other, thereby cutting off and closing the fluid channels 5 on both sides of the air bladder 2. Conversely, when the pressurizing medium inside the pressurization chamber 4 is discharged, the air bladder 2 contracts, the fluid channel 5 expands, thereby opening the fluid channels 5 on both sides of the air bladder 2. The pressurizing medium is a gaseous medium or a liquid medium.

[0039] In this embodiment, the cylindrical airbag 2 has expansion sealing parts 2a that are circumferentially and equally spaced around the axis of the tube body 1. There are at least three expansion sealing parts 2a. In this embodiment, there are three expansion sealing parts 2a. The expansion sealing parts 2a refer to the parts that can squeeze and contact each other when the airbag 2 is inflated to the maximum extent. Since the conventional expansion sealing parts 2a still have a certain curvature in the middle position after being inflated to the maximum extent, after multiple expansion sealing parts 2a are squeezed and surrounded, there are still small gaps at the central axis position of the tube body 1, which cannot achieve a complete sealing effect. Therefore, in this embodiment, the pressurized flexible throttle valve has a sealing protrusion 3 extending toward the axis of the tube body 1 at the middle position of the expansion sealing part 2a. When the airbag 2 is pressurized to the maximum extent so that the pressurized flexible throttle valve is in the closed state, the sealing protrusion 3 located in the middle of the multiple expansion sealing parts 2a squeezes and seals each other, thereby blocking the central gap formed by the multiple expansion sealing parts 2a, thereby eliminating the central gap and achieving complete sealing of the pressurized flexible throttle valve.

[0040] In this embodiment, preferably, the sealing protrusion 3 can be integrally formed by thickening the middle position of the expansion sealing part 2a of the airbag 2, or a separate rubber sealing protrusion 3 can be bonded and fixed to the middle position of the expansion sealing part 2a.

[0041] Combination Figure 5 To further improve the sealing performance, in this embodiment, the shape of the sealing protrusion 3 along the radial section of the tube body 1 is preferably a triangular structure. The top of the triangular sealing protrusion 3 forms a ridge 3a parallel to the central axis of the tube body 1. When the airbag 2 is inflated to the closed state, multiple circumferentially evenly distributed triangular sealing protrusions 3 converge toward the central axis of the tube body 1 and finally press against each other. The ridge 3a of each sealing protrusion 3 coincides with the central axis of the tube body 1, thereby achieving a complete seal.

[0042] Preferably, if the number of triangular sealing protrusions is n, then the apex angle t of the triangular sealing protrusions satisfies:

[0043]

[0044] For example, in this embodiment, there are 3 triangular sealing protrusions, and the apex angle t of the triangular sealing protrusions is between 121° and 123°. By slightly increasing the angle of the apex angle of the triangle, the 3 triangular sealing protrusions are press-fitted together, thereby further improving the sealing performance.

[0045] See Figure 2-4 The airbag 2 has grooves 2b on both sides of the sealing protrusion 3 in the width direction (i.e., the axial direction of the tube 1). The two ends of the grooves 2b extend along the edge of the sealing protrusion 3, and the two sides of the sealing protrusion 3 are connected within the range of the grooves 2b. It should be noted that the groove 2b can be formed on the inner or outer wall of the airbag 2. In this embodiment, the groove 2b is preferably formed on the outer side of the airbag 2. The thickness of the airbag 2 at the groove 2b is less than the thickness of other parts. Therefore, when the airbag 2 expands to its maximum extent, the expansion amplitude of the thin-walled part at the groove 2b is greater than that of the rest to form two expansion ridges located on both sides of the sealing protrusion 3. Since the two sides of the sealing protrusion 3 are connected within the groove 2b, the expansion ridges formed by the pressure at the groove 2b apply a greater elastic compressive force to both sides of the sealing protrusion 3. When multiple sealing protrusions 3 are pressed tightly together, the elastic compressive force provided by the expansion ridges on both sides of them causes the sealing protrusions 3 to be further pressurized and pressed against both sides along the axial direction of the pipe body 1, thereby ensuring a better tight connection between multiple sealing protrusions 3, completely eliminating gaps, so as to achieve complete sealing of the fluid channel 5 and ensure the good sealing performance of the throttle valve.

[0046] At the same time, the sealing protrusion 3 thickens and reinforces the middle part of the airbag 2 sealing part, thereby reducing the elastic stress at this point, reducing material fatigue damage, and improving safety.

[0047] See Figure 6 In order for the sealing protrusion 3 and the groove 2b on the airbag 2 to meet the actual processing requirements, in this embodiment, the design parameters of the airbag 2 along the axial section of the tube body 1 meet the following conditions:

[0048]

[0049]

[0050]

[0051]

[0052] Wherein, L0 is the axial distance between the two sides of the airbag 2, L1 is the axial width of the sealing protrusion 3, L2 is the axial distance from the outer side of the groove 2b to the sealing protrusion 3, and L3 is the axial distance from the outer side of the airbag 2 to the outer side of the groove 2b.

[0053] Example 2

[0054] See Figure 7 The pressurized flexible throttling valve in this embodiment is largely the same as that in Embodiment 1, except that the airbag 2 in this embodiment is hemispherical, and the expansion sealing part 2a corresponds one-to-one with the hemispherical airbag 2. There are at least three airbags 2, and the at least three airbags 2 are evenly arranged circumferentially on the inner wall of the pipe body 1 around the axis of the pipe body 1, thereby making the multiple expansion sealing parts 2a circumferentially evenly distributed. The rest is the same as in Embodiment 1, and will not be described in detail here to avoid repetition.

[0055] It should be noted that the airbag and its connection to the tube are not limited to the two implementation methods described above. Depending on actual needs, the following four forms may also be included:

[0056] ① The airbag is in the shape of a swimming ring; when the plane containing the airbag axis and the airbag radius is taken as the cross section, the airbag cross section is annular; the airbag itself forms a sealed pressurized chamber; in use, the airbag is placed in the medium conveying pipeline; the airbag axis coincides with the axis of the medium conveying pipeline.

[0057] ② The airbag is in the shape of a swimming ring; when the plane containing the airbag axis and the airbag radius is taken as the cross section, the airbag cross section is annular; the airbag itself forms a sealed inflation chamber; the airbag is built into the sleeve and the airbag axis coincides with the sleeve axis; in use, the airbag and the sleeve are set together in the medium conveying pipeline; the axes of the airbag, the sleeve and the medium conveying pipeline coincide.

[0058] ③ The airbag is composed of a cylindrical elastic membrane built into the medium conveying pipeline and the medium conveying pipeline; when in use, the axis of the cylindrical elastic membrane coincides with the axis of the medium conveying pipeline, and both ends of the cylindrical elastic membrane are sealed and fixed to the inner wall of the medium conveying pipeline.

[0059] ④ The airbag is composed of a cylindrical elastic membrane and a sleeve; the cylindrical elastic membrane is disposed inside the sleeve and the axis of the cylindrical elastic membrane coincides with the axis of the sleeve; the two ends of the cylindrical elastic membrane and the two ends of the sleeve are respectively sealed and fixed one-to-one; in use, the cylindrical elastic membrane and the sleeve are disposed together in the medium conveying pipeline; the axes of the cylindrical elastic membrane, the sleeve and the medium conveying pipeline coincide.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0061] Although the above embodiments have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the above descriptions are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made using the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A pressurized flexible throttling valve, comprising a tube body and an air bladder, wherein the air bladder is fixedly connected to the inner wall of the tube body, and the air bladder and the tube body form a pressurized cavity, and the air bladder forms a fluid channel, characterized in that: The airbag has at least three expansion sealing parts that are circumferentially and equally spaced around the axis of the tube. The expansion sealing parts are the parts that can squeeze and contact each other when the airbag is inflated to its maximum extent. A sealing protrusion extending toward the axis of the tube is provided in the middle of the expansion sealing part. Grooves are respectively provided on both sides of the sealing protrusion in the width direction of the airbag. The two ends of the grooves extend along the edge of the sealing protrusion, and the two sides of the sealing protrusion are connected within the groove.

2. The pressurized flexible throttling valve according to claim 1, characterized in that: The sealing protrusion is integrally formed by thickening the middle part of the airbag's expansion sealing part.

3. The pressurized flexible throttling valve according to claim 2, characterized in that: The sealing protrusion is bonded and fixed to the middle position of the expansion seal by adhesive bonding.

4. The pressurized flexible throttling valve according to any one of claims 1-3, characterized in that: The sealing protrusion is triangular in shape along the radial cross section of the pipe body, and the top of the triangular sealing protrusion forms a ridge parallel to the central axis of the pipe body.

5. The pressurized flexible throttling valve according to claim 4, characterized in that: The apex angle of the triangular sealing protrusion satisfy: in, This refers to the number of sealing protrusions.

6. The pressurized flexible throttling valve according to claim 1, characterized in that: The groove is formed on the inner or outer wall of the airbag.

7. The pressurized flexible throttling valve according to claim 6, characterized in that: The design parameters of the airbag along the axial section of the tube body satisfy the following conditions: This represents the axial distance between the two sides of the airbag. The axial width of the sealing protrusion; The axial distance from the outer side of the groove to the sealing protrusion; It is the axial distance from the outer side of the airbag to the outer side of the groove.

8. The pressurized flexible throttling valve according to claim 4, characterized in that: The airbag has a cylindrical structure, and both ends of the airbag are fixedly connected to the inner wall of the tube.

9. The pressurized flexible throttling valve according to claim 4, characterized in that: The airbag has a hemispherical structure, and the expansion sealing part corresponds one-to-one with the hemispherical airbag.

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