Dustproof structure of double-eccentric butterfly valve

Abstract

The utility model discloses a dustproof structure of a double-eccentric butterfly valve, and belongs to the technical field of double-eccentric butterfly valves. Comprising a valve body, a support, a rear end cover, a valve rod, a butterfly plate, an upper shaft sleeve, a lower shaft sleeve and an inner O-shaped ring. A bracket is arranged on the upper end opening of the valve body; a rear end cover is arranged on the lower end opening of the valve body; the valve rod is arranged in the valve body and can rotate relative to the valve body; a butterfly plate is arranged on the valve rod, and the arrangement position of the butterfly plate is right opposite to the inlet and the outlet in the valve body. An upper shaft sleeve is located above the butterfly plate and attached to the valve body; the lower shaft sleeve is positioned below the butterfly plate and is attached to the valve body; and inner O-shaped rings are arranged on the contact surfaces of the upper shaft sleeve and the lower shaft sleeve with the valve rod. The double-eccentric butterfly valve solves the problem that materials such as dust can permeate into the rotating combination face of the valve rod of an existing double-eccentric butterfly valve, so that the valve rod is locked and jammed.

Description

Technical Field

[0001] The utility model belongs to the technical field of double-eccentric butterfly valves, and particularly relates to a dust-proof structure of a double-eccentric butterfly valve. Background Art

[0002] Double-eccentric butterfly valves, also known as high-performance butterfly valves, are primarily used as flow control and interception devices in drainage systems such as water plants, power plants, steel smelting plants, chemical plants, and water source projects. Their structural characteristic is that the valve stem axis is offset from both the disc and the valve body. This double eccentricity allows the disc to quickly disengage from the seat when the valve is opened, significantly eliminating unnecessary squeezing and scraping between the disc and seat, reducing opening resistance, minimizing wear, and extending the life of the valve seat.

[0003] The valve stem of the double eccentric butterfly valve has a very high frequency of movement. In a medium environment containing dust and impurities such as gas, the dust in the medium will enter the shaft sleeve and the filling group and accumulate therein, affecting the smooth rotation of the valve stem in the shaft sleeve. In severe cases, the valve stem may be locked in the shaft sleeve. Utility Model Content

[0004] The utility model provides a dust-proof structure for a double-eccentric butterfly valve, wherein O-ring grooves are provided on the shaft sleeves at the upper and lower ends of the valve stem, and O-rings are embedded in the O-ring grooves; the O-rings can play a sealing role on the rotating joint surface of the valve stem, blocking some dust-like materials from penetrating into the rotating joint surface of the valve stem, preventing these penetrating materials from causing the valve stem to lock and become stuck on the rotating joint surface of the valve stem, thereby affecting the normal opening or closing of the double-eccentric butterfly valve; the utility model solves the problem that dust and other materials may penetrate into the rotating joint surface of the valve stem of the current double-eccentric butterfly valve, causing the valve stem to lock and become stuck.

[0005] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0006] A double eccentric butterfly valve dustproof structure, comprising: a valve body, a bracket, a rear end cover, a valve stem, a butterfly plate, an upper shaft sleeve, a lower shaft sleeve, and an inner O-ring;

[0007] A bracket is provided on the upper opening of the valve body; a rear end cover is provided on the lower opening of the valve body;

[0008] The valve stem is disposed in the valve body, and the valve stem is rotatable relative to the valve body;

[0009] A butterfly plate is provided on the valve stem, and the butterfly plate is provided at a position facing the inlet and outlet of the valve body;

[0010] An upper shaft sleeve is provided above the butterfly plate and is fitted on the valve body; a lower shaft sleeve is provided below the butterfly plate and is fitted on the valve body;

[0011] The contact surfaces of the upper sleeve and the lower sleeve with the valve stem are all embedded with inner O-rings.

[0012] Preferably, a circle of O-ring grooves is provided on the contact surfaces of the upper sleeve and the lower sleeve with the valve stem; and the inner O-ring is arranged in the O-ring grooves.

[0013] Preferably, a circle of O-ring grooves is provided on the contact surfaces of the upper sleeve and the lower sleeve with the valve body; and an outer O-ring is provided in the O-ring groove.

[0014] Preferably, the cross-sections of the inner O-ring and the outer O-ring are both circular;

[0015] The cross section of the O-ring groove is also configured as a circular arc segment structure;

[0016] The inner O-ring and the outer O-ring can fully fit in the O-ring groove.

[0017] Preferably, the cross sections of the inner O-ring and the outer O-ring are both configured as irregular rectangles; the upper edges of the irregular rectangles are configured as arc-shaped edges;

[0018] The cross section of the O-ring groove is configured as a rectangular surface with an open upper end.

[0019] Preferably, the lower bottom surfaces of the inner O-ring and the outer O-ring are configured as O-ring friction pads;

[0020] A groove friction pad is provided on the bottom surface of the O-ring groove.

[0021] Preferably, bearing embedding grooves are provided on the contact surfaces of the upper sleeve and the lower sleeve with the valve stem;

[0022] The upper and lower ends of the valve stem are both sleeved with rubber bearings, and the rubber bearings are embedded in the bearing embedding grooves.

[0023] Preferably, a packing is provided on the upper end of the upper sleeve and in contact with the valve body, and a packing gland is provided on the upper end opening of the valve body; the packing gland seals the packing.

[0024] Preferably, a transfer shaft is provided at the upper end of the bracket, and the transfer shaft is connected to the upper end of the valve stem. Driven by the transfer shaft, the valve stem can rotate.

[0025] Preferably, a circle of O-ring groove is formed on the contact surface between the rear end cover and the valve body; and the rear end cover O-ring is arranged in the O-ring groove.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides a dust-proof structure for a double-eccentric butterfly valve, in which an upper sleeve and a lower sleeve are arranged at the upper and lower ends of the butterfly plate and are attached to the valve body; O-ring grooves are provided on the contact surfaces between the upper sleeve and the lower sleeve and the valve stem, and an inner O-ring is arranged inside; the inner O-ring seals the rotating contact surface of the valve stem, preventing dust and impurities from penetrating the contact surfaces between the valve stem and the upper sleeve and the lower sleeve, which would cause the valve stem to become stuck or even locked during rotation.

[0028] An O-ring groove is provided on the contact surface between the upper sleeve and the lower sleeve and the valve body to seal the contact surface between the upper sleeve and the lower sleeve and the valve body and prevent dust and impurities from penetrating into the contact surface.

[0029] When a conventional O-ring with a circular cross-section is used, the cross-sectional structure of the O-ring groove is set to a circular arc segment structure, which is equivalent to the O-ring groove being a circular arc surface groove; in this way, the O-ring will be more firmly embedded in the O-ring groove, avoiding the O-ring from loosening and affecting the sealing effect.

[0030] The cross section of the O-ring is set to an irregular rectangle, and the upper edge of the irregular rectangle is set to an arc edge; which is equivalent to the upper surface of the O-ring being a convex arc surface; correspondingly, the cross section of the O-ring groove is also set to a rectangle; in this way, the irregular rectangular O-ring is embedded in the rectangular O-ring groove, and the combination of the two can also achieve the purpose of preventing the O-ring from loosening or rotating.

[0031] An O-ring friction pad is provided on the bottom surface of the O-ring having an irregular rectangular cross section; a groove friction pad is also provided on the bottom of the O-ring groove; and the contact between the O-ring friction pad and the groove friction pad can further improve the contact stability of the O-ring in the O-ring groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0034] Figure 2 This is a schematic diagram of the O-ring structure inside the upper sleeve of the utility model;

[0035] Figure 3 This is a schematic diagram of the O-ring structure inside the lower sleeve of the utility model;

[0036] Figure 4This is a schematic diagram of the cross-sectional structure of the arc-surface O-ring groove and the O-ring with a circular cross section embedded in the utility model;

[0037] Figure 5 This is a schematic diagram of the cross-sectional structure of the rectangular O-ring groove and the O-ring with an irregular rectangular cross section of the present invention;

[0038] Figure 6 It is a cross-sectional structural diagram of a rectangular O-ring groove bottom provided with a groove friction pad layer and an O-ring with an irregular rectangular cross section provided with an O-ring friction pad layer at the bottom of the utility model.

[0039] In the accompanying drawings, the structural names represented by the reference numerals are:

[0040] 1-adapter shaft, 2-bracket, 3-valve stem, 4-standard spring, 5-packing gland, 6-packing, 7-upper sleeve, 8-valve body, 9-upper bearing, 10-embedded spring, 11-insert, 12-seal ring, 13-gasket, 14-cylindrical pin, 15-butterfly plate, 16-lower sleeve, 17-lower bearing, 18-rear end cover, 19-inner O-ring, 1901-O-ring friction pad, 20-outer O-ring, 21-rear end cover O-ring, 22-O-ring groove, 2201-groove friction pad. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the 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.

[0042] Example 1

[0043] A double eccentric butterfly valve dustproof structure, comprising: a valve body 8, a bracket 2, a rear end cover 18, a valve stem 3, a butterfly plate 15, an upper sleeve 7, a lower sleeve 16, and an inner O-ring 19;

[0044] like Figure 1 As shown, a bracket 2 is provided on the upper end opening of the valve body 8 of the butterfly valve, and the bracket 2 and the valve body 8 are connected by fixing bolts; a rear end cover 18 is provided on the lower end opening of the valve body 8, and the lower end opening of the valve body 8 is blocked by the rear end cover 18; the valve stem 3 passes through the valve body 8 from the bracket 2, and the tail end of the valve stem 3 is rotatably provided at the bottom of the valve body 8, and the valve stem 3 is rotatable relative to the bracket 2 and the valve body 8;

[0045] A butterfly plate 15 is provided on the valve stem 3, and the butterfly plate 5 and the valve stem 3 are fixed by a cylindrical pin 14; the butterfly plate 15 is provided at the inlet and outlet of the butterfly valve; the butterfly plate 15 can rotate synchronously with the rotation of the valve stem 3; a gasket 13 is provided on the outer circumference of the butterfly plate 15, and the gasket 13 provides sealing between the butterfly plate 15 and the valve body 8 and sealing compensation after closing; a circle of sealing ring 12 is provided on the inlet side or outlet side of the butterfly valve, and after the butterfly plate 15 closes the valve, the butterfly plate 15 contacts the sealing ring 12, and the sealing ring 12 plays a sealing role on the inlet side or outlet side of the valve body 8; Figure 1 As shown, the sealing ring 12 is fixed to the inlet side or outlet side of the valve body through the insert 11; an embedded spring 10 is provided on the end of the insert 11 that contacts the valve body; when the butterfly plate 15 is closed, a certain impact will be generated on the sealing ring 12, and the sealing ring 12 will transmit part of the impact force to the insert 11 when impacted. The embedded spring 10 absorbs and buffers the impact force on the insert 11 to prevent the insert 11 from directly contacting the valve body.

[0046] A transfer shaft 1 is provided at the upper end of the bracket 2. The upper end of the valve stem 3 extends from the upper end opening of the valve body 8 to the transfer shaft 1 and is connected to the transfer shaft 1. The transfer shaft 1 is connected to a drive component, which can be an electrically controlled drive component or a manual drive component. The transfer shaft 1 is controlled by the drive component, and the transfer shaft 1 drives the valve stem 3 to rotate.

[0047] An upper sleeve 7 is provided above the butterfly plate 15 and is in contact with the inner wall of the valve body 8. The valve stem 3 passes through the upper sleeve 7 and can rotate relative to the upper sleeve 7. A lower sleeve 16 is provided below the butterfly plate 15 and is in contact with the inner wall of the valve body 8. The valve stem 3 passes through the lower sleeve 16 and can rotate relative to the lower sleeve 16. A gasket 13 is provided between the lower sleeve 16 and the rear end cover 18 on the valve body 8, and the gasket 13 plays a sealing role. A packing gland 5 is provided at the upper end opening of the valve body 8, and a packing 6 is provided between the packing gland 5 and the upper sleeve 7. The packing gland 5 and the packing 6 constitute a packing seal assembly, which can prevent materials or impurities from entering the valve body 8 from the upper end opening of the valve body 8.

[0048] The butterfly valve is repeatedly opened or closed, causing the valve stem 3 to drive the butterfly plate 15 to rotate at a high frequency. During the high-frequency rotation of the valve stem 3 and the butterfly plate 15, some fine dust impurities will enter the contact surface between the upper sleeve 7 and the lower sleeve 16 and the valve stem 3. The fine dust impurities will accumulate on the contact surface between the upper sleeve 7 and the lower sleeve 16 and the valve stem 3. As the dust impurities accumulate more and more, the rotation of the valve stem 3 may become stuck or even locked and unable to rotate.

[0049] like Figure 2As shown, an O-ring groove 22 is provided on the contact surface between the upper sleeve 7 and the valve stem 3, and an inner O-ring 19 is provided in the O-ring groove 22; Figure 3 As shown, an O-ring groove 22 is also provided on the contact surface between the lower sleeve 16 and the valve stem 3, and an inner O-ring 19 is also provided in the O-ring groove 22; the O-ring itself has a certain elasticity, and the inner O-ring 19 provided in the O-ring groove 22 will contact the surface of the valve stem 3 to form a sealing effect, thereby preventing fine dust impurities from penetrating into the contact gap between the valve stem 3 and the upper sleeve 7 and the lower sleeve 16, and forming a large amount of accumulation, thereby affecting the normal rotation of the valve stem 3.

[0050] In addition to the dust impurities that may penetrate into the contact surfaces between the upper sleeve 7 and the lower sleeve 16 and the valve stem 3, the contact surfaces between the upper sleeve 7 and the lower sleeve 16 and the valve body 8 are not completely seamless. There is also a gap between the two, and fine dust impurities may penetrate into the gap. After the contact gap between the upper sleeve 7 and the lower sleeve 16 and the valve body 8 is stuck by the accumulated dust impurities, the upper sleeve 7 and the lower sleeve 16 may be deformed, and the rotation of the valve stem 3 in the upper sleeve 7 and the lower sleeve 16 may be blocked.

[0051] Therefore, an O-ring groove 22 is also provided on the contact surface between the upper sleeve 7 and the lower sleeve 16 and the valve body 8, and an outer O-ring 20 is arranged in the O-ring groove 22. The outer O-ring 20 seals the contact surface gap between the upper sleeve 7 and the lower sleeve 16 and the valve body 8 to prevent fine dust from penetrating into the contact gap between the upper sleeve 7 and the lower sleeve 16 and the valve body 8, causing the valve stem 3 to become stuck.

[0052] Example 2

[0053] Based on Example 1, in Example 1, the inner O-ring 19 and the outer O-ring 20 arranged in the O-ring groove 22 rely on the elastic effect of the inner O-ring 19 or the outer O-ring 20 themselves to contact the surface of the valve stem 3 or the valve body 8, thereby achieving the purpose of sealing the contact gap between the upper sleeve 7 and the lower sleeve 16 and the valve stem 3 and the valve body 8; the better the adaptability of the O-ring to the O-ring groove 22, the better the contact between the O-ring and the surface of the valve stem 3 and the valve body 8, and the better the sealing compensation margin;

[0054] like Figure 4 As shown, in this embodiment, the structures of the inner O-ring 19 and the outer O-ring 20 are both set to be annular, and their cross-section is circular; the corresponding O-ring groove 22 has a cross-section that is also set to be an arc segment structure, and the entire O-ring groove 22 is a groove structure with an arc surface; the inner O-ring 19 and the outer O-ring 20 are placed in the O-ring groove 22, and can fully fit with the inner wall of the O-ring groove 22 to avoid gaps between the fitting surfaces of the two, which requires consuming the sealing compensation margin of the O-ring itself.

[0055] Example 3

[0056] Based on Example 1, in Example 1, the inner O-ring 19 and the outer O-ring 20 arranged in the O-ring groove 22 rely on the elastic effect of the inner O-ring 19 or the outer O-ring 20 themselves to contact the surface of the valve stem 3 or the valve body 8, thereby achieving the purpose of sealing the contact gap between the upper sleeve 7 and the lower sleeve 16 and the valve stem 3 and the valve body 8; the better the adaptability of the O-ring to the O-ring groove 22, the better the contact between the O-ring and the surface of the valve stem 3 and the valve body 8, and the better the sealing compensation margin;

[0057] like Figure 5 As shown, in this embodiment, the O-ring is also configured as a circular ring structure, the cross-section of the O-ring is configured as an irregular rectangle, and the upper edge of the irregular rectangle is configured as an upward convex arc edge; the corresponding O-ring groove 22 is also configured as a rectangular groove, so that the O-ring is placed in the O-ring groove 22, and the bottom and side surfaces of the two can fit well, ensuring the placement stability of the O-ring in the O-ring groove 22; in addition, the contact surface between the O-ring and the valve stem 3 or the valve body 8 is an upward convex arc surface, with sufficient compensation margin for sealing.

[0058] Example 4

[0059] Based on the second or third embodiment, the O-ring is embedded in the O-ring groove 22. Although the two can maintain good adaptability and ensure the compensation margin of the sealing contact, during the rotation of the valve stem 3, especially the inner O-ring 19, it may rotate with the rotation of the valve stem 3. During the rotation of the O-ring, its sealing performance will be affected.

[0060] Therefore, in this embodiment, a groove friction pad 2201 is provided on the inner wall of the O-ring groove 22, and an O-ring friction pad 1901 is provided on the contact surface between the O-ring and the inner wall of the O-ring groove 22. The O-ring is provided in the O-ring groove 22. The contact between the friction pads of the two can increase the contact friction between the O-ring and the O-ring groove 22, thereby preventing the O-ring from rotating and shifting during the rotation of the valve stem 3, thereby affecting the sealing.

[0061] like Figure 6 As shown, if the cross-section of the O-ring structure is an irregular rectangle, an O-ring friction pad 1901 is set on the bottom surface of the O-ring, and a groove friction pad 2201 is set on the bottom surface of the rectangular O-ring groove 22; similarly, the contact between the two friction pads is utilized to increase the contact friction between the two, thereby preventing the O-ring from rotating during the rotation of the valve stem 3.

[0062] Example 5

[0063] like Figure 1As shown, bearing embedding grooves are provided on the contact surfaces of the upper sleeve 7 and the lower sleeve 16 with the valve stem 3. Under normal circumstances, the upper and lower ends of the valve stem 3 are respectively provided with an upper bearing 9 and a lower bearing 17, and a part of the bearing is embedded in the bearing embedding groove. The bearings are usually provided with stainless steel bearings. However, the friction vibration generated by the stainless steel bearings is relatively large, and the noise is relatively large during the opening and closing process of the butterfly valve.

[0064] In this embodiment, the stainless steel bearing is replaced with a rubber bearing. The rubber bearing can maintain a good sealing state without using lubricant or using less lubricant; and reduce friction vibration and noise generated during the rotation of the valve stem.

[0065] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, numerous modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A double eccentric butterfly valve dustproof structure, characterized in that: include: Valve body, bracket, rear end cover, valve stem, butterfly plate, upper sleeve, lower sleeve, inner O-ring; A bracket is provided on the upper opening of the valve body; a rear end cover is provided on the lower opening of the valve body; The valve stem is disposed in the valve body, and the valve stem is rotatable relative to the valve body; A butterfly plate is provided on the valve stem, and the butterfly plate is provided at a position facing the inlet and outlet of the valve body; An upper shaft sleeve is provided above the butterfly plate and is fitted on the valve body; a lower shaft sleeve is provided below the butterfly plate and is fitted on the valve body; The contact surfaces of the upper sleeve and the lower sleeve with the valve stem are all embedded with inner O-rings.

2. A double eccentric butterfly valve dustproof structure according to claim 1, characterized in that: An O-ring groove is provided on the contact surfaces of the upper sleeve and the lower sleeve with the valve stem; The inner O-ring is disposed in the O-ring groove.

3. The double eccentric butterfly valve dustproof structure according to claim 1, characterized in that: A circle of O-ring grooves is formed on the contact surfaces of the upper sleeve and the lower sleeve with the valve body; an outer O-ring is arranged in the O-ring groove.

4. A double eccentric butterfly valve dustproof structure according to claim 3, characterized in that: The cross sections of the inner O-ring and the outer O-ring are both circular; The cross section of the O-ring groove is also configured as an arc segment structure.

5. The double eccentric butterfly valve dustproof structure according to claim 3, characterized in that: The cross sections of the inner O-ring and the outer O-ring are both configured as irregular rectangles; the upper edges of the irregular rectangles are configured as arc-shaped edges; The cross section of the O-ring groove is configured as a rectangular surface with an open upper end.

6. A double eccentric butterfly valve dustproof structure according to claim 5, characterized in that: The lower bottom surfaces of the inner O-ring and the outer O-ring are configured as O-ring friction pads; A groove friction pad is provided on the bottom surface of the O-ring groove.

7. The double eccentric butterfly valve dustproof structure according to claim 1, characterized in that: The contact surfaces of the upper sleeve and the lower sleeve with the valve stem are provided with bearing embedding grooves; The upper and lower ends of the valve stem are both sleeved with rubber bearings, and the rubber bearings are embedded in the bearing embedding grooves.

8. The double eccentric butterfly valve dustproof structure according to claim 1, characterized in that: The upper end of the upper sleeve is fitted with a packing on the valve body, and a packing gland is provided on the upper end opening of the valve body; the packing gland seals the packing.

9. The double eccentric butterfly valve dustproof structure according to claim 1, characterized in that: A transfer shaft is provided at the upper end of the bracket, and the transfer shaft is connected to the upper end of the valve stem. Driven by the transfer shaft, the valve stem can rotate.

10. The double eccentric butterfly valve dustproof structure according to claim 1, characterized in that: A circle of O-ring groove is formed on the contact surface between the rear end cover and the valve body; the rear end cover O-ring is arranged in the O-ring groove.

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