Valve

Abstract

The utility model discloses a valve which comprises a sealing structure, the sealing structure comprises a first sealing piece and a second sealing piece, a valve rod is sleeved with the first sealing piece, and the first sealing piece is arranged at the end, close to a circulation channel, of filler; the second sealing piece is installed on the butterfly plate frame, and the peripheral side of the second sealing piece is suitable for being in contact with the inner wall of a circulation channel; a first sealing channel is formed in the first sealing piece, and a second sealing channel is formed in the second sealing piece; the valve body is provided with a first grease injection channel corresponding to the first sealing channel, and the valve body and the valve rod are provided with a second grease injection channel corresponding to the second sealing channel. In an emergency, resealing of the contact position of the valve rod and the filler and sealing between the second sealing piece and the valve body can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve sealing, in particular to a valve. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure. It can be used for on-off control of low-pressure pipeline media. A butterfly valve is a valve whose closing member is a disc that rotates around the valve stem to achieve opening and closing.

[0003] Butterfly valves typically use a stem as the operating element. As the frequency of opening and closing increases, friction between the stem and the packing, as well as between the disc and the valve body, causes continuous wear of the packing contact surface and the outer surface of the disc. Conventional butterfly valves rarely feature a sealant grease injection mechanism. In the event of an emergency leak, the stem's special structure prevents timely replacement of the packing or disc, resulting in a poor seal and potential accidents. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that conventional butterfly valves rarely have a sealing grease injection structure. When leakage occurs in an emergency, the sealing packing or valve disc cannot be replaced in time due to the special structure of the valve stem, and the sealing cannot be performed well, which can easily cause accidents.

[0005] To this end, the utility model provides a valve, comprising:

[0006] A valve body, the valve body including a flow channel, a valve stem inserted into the valve body, and a filler filled between the valve body and the valve stem; a butterfly plate holder is mounted on at least a portion of the valve stem located at the flow channel, and the circumference of the butterfly plate holder can contact the inner wall of the flow channel to separate the flow channel;

[0007] a sealing structure comprising a first sealing member and a second sealing member, wherein the first sealing member is sleeved on the valve stem and disposed at an end of the packing adjacent to the circulation channel; and the second sealing member is mounted on the butterfly plate holder, wherein a circumferential side of the second sealing member is adapted to contact an inner wall of the circulation channel;

[0008] Among them, a first sealing channel is opened on the first sealing member, and a second sealing channel is opened on the second sealing member; a first grease injection channel is opened on the valve body corresponding to the first sealing channel, and a second grease injection channel is opened on the valve body and the valve stem corresponding to the second sealing channel.

[0009] Optionally, the first sealing member is an annular member, and the first sealing member is sleeved on the valve stem;

[0010] The first sealed channel comprises:

[0011] a first inner annular groove, the first inner annular groove being provided on an inner surface of the first sealing member close to the valve stem;

[0012] a first outer annular groove, the first outer annular groove being arranged on an outer surface of the first sealing member close to the valve body;

[0013] A plurality of first communicating holes are provided, and the plurality of first communicating holes are evenly distributed between the first inner ring groove and the first outer ring groove to connect the first inner ring groove and the first outer ring groove.

[0014] Optionally, the first outer ring groove is arranged opposite to the first grease injection channel.

[0015] Optionally, an annular sealing groove is provided on one side of the butterfly plate frame with the axis of the circulation channel as the center, and the second sealing member is an annular member, and the second sealing member is sleeved in the sealing groove;

[0016] The second sealed channel includes:

[0017] a second inner ring groove, the second inner ring groove being opened on a side of the second sealing member close to the valve stem with the axis of the flow channel as the center;

[0018] a second outer annular groove, the second outer annular groove being formed on an outer surface of the second sealing member close to an inner wall of the circulation channel with the axis of the circulation channel as the center;

[0019] A plurality of second communicating holes are provided, and the plurality of first communicating holes are evenly distributed between the first inner ring groove and the first outer ring groove to connect the second inner ring groove and the second outer ring groove.

[0020] Optionally, the second inner ring groove is arranged opposite to the second grease injection channel.

[0021] Optionally, at least four of the first communicating holes and the second communicating holes are provided.

[0022] Optionally, the second sealing channel includes:

[0023] a first through hole, the first through hole being formed at an end of the valve body away from the packing;

[0024] a second through hole, the second through hole corresponding to the first through hole and being formed on the valve stem;

[0025] a rod hole, the rod hole being formed on the valve stem along a straight line where the axis of the valve stem is located, the rod hole being in communication with the second through hole;

[0026] A third through hole, wherein the third through hole passes through the valve stem and the valve body, one end of the third through hole is connected to the stem hole, and the other end is relatively communicated with the second inner ring groove.

[0027] Optionally, a mounting surface is further provided on one end of the valve body away from the packing; the valve further comprises an anti-slip structure, and the anti-slip structure is installed between the valve stem and the valve body.

[0028] Optionally, the valve body further comprises a pressure ring, which is connected to the butterfly plate frame to fix the second sealing member in the sealing groove.

[0029] Optionally, the valve body further comprises a one-way valve and a grease injection valve, wherein two one-way valves are provided and are respectively arranged in the first grease injection channel and the first through hole;

[0030] The grease injection valves are provided with two and are respectively arranged at the first grease injection channel and the opening end of the first through hole away from the valve stem.

[0031] The technical solution provided by the utility model has the following advantages:

[0032] 1. The valve provided by the present invention includes a valve body and a sealing structure, the valve body includes a circulation channel, a valve stem is inserted into the valve body, and filler is filled between the valve body and the valve stem; a butterfly plate holder is installed on at least part of the valve stem located at the circulation channel position, and the peripheral side of the butterfly plate holder can contact the inner wall of the circulation channel to separate the circulation channel; the sealing structure includes a first seal and a second seal, the first seal is sleeved on the valve stem, and the first seal is arranged at one end of the filler close to the circulation channel; the second seal is installed on the butterfly plate holder, and the peripheral side of the second seal is suitable for contacting the inner wall of the circulation channel; a first sealing channel is opened on the first seal, and a second sealing channel is opened on the second seal; a first grease injection channel is opened on the valve body corresponding to the first sealing channel, and a second grease injection channel is opened on the valve body and the valve stem corresponding to the second sealing channel.

[0033] This structure enables emergency sealing of the packing and disc carrier positions using an external grease injection device. Grease is injected into the first and second sealing channels through the first and second grease injection channels, respectively. The sealing grease fills the gap between the first seal and the valve stem. Under the action of the grease injection pressure, the sealing grease is squeezed toward both sides into the gap between the packing and the valve stem, as well as the gap between the sleeve and the valve stem, filling the gaps and thus resealing the contact point between the valve stem and the packing. The sealing grease at another location squeezes into the gap between the second seal and the valve body, filling the gap and forming a seal. Both squeeze into the gap between the valve stem and the sleeve, leveraging the unique lubricating effect of the sealing grease to reduce wear between the contact surfaces of the valve stem and the sleeve, reducing valve torque and extending the valve life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the internal structure of the valve provided in the present utility model;

[0036] Figure 2 This is a schematic diagram of the installation of the first sealing member provided in the present utility model;

[0037] Figure 3 This is a schematic structural diagram of the first sealing member provided in the present utility model;

[0038] Figure 4 This is a schematic structural diagram of the anti-slip structure provided in the present invention;

[0039] Figure 5 For this utility model Figure 4 A local enlarged view of point A;

[0040] Figure 6 This is a schematic structural diagram of the second sealing member provided in the present utility model;

[0041] Figure 7 A side view of the valve provided in the present utility model;

[0042] Figure 8 For this utility model Figure 7 A partial enlarged view of point B;

[0043] Description of reference numerals:

[0044] 1 - valve body; 11 - circulation channel; 12 - first grease injection channel; 13 - second grease injection channel; 131 - first through hole; 132 - second through hole; 133 - rod hole; 134 - third through hole; 14 - shaft sleeve;

[0045] 2-valve stem;

[0046] 3-filler;

[0047] 4- butterfly plate frame;

[0048] 5 - first sealing member; 51 - first inner ring groove; 52 - first outer ring groove; 53 - first communicating hole;

[0049] 6 - second sealing member; 61 - second inner ring groove; 62 - second outer ring groove; 63 - second communicating hole;

[0050] 7-anti-slip structure; 71-thrust pad; 72-split ring; 73-blow-proof sleeve; 74-thrust pad;

[0051] 8-pressure ring;

[0052] 9-lower flange;

[0053] 101- one-way valve; 102- grease injection valve;

[0054] 111-pressure plate; 112-pressure sleeve. DETAILED DESCRIPTION

[0055] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0058] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Example

[0060] This embodiment provides a valve, such as Figures 1 to 8 As shown, it includes a valve body 1 and a sealing structure. The valve body 1 is the butterfly valve body. Figure 1 As shown, a through hole is opened in the middle of the vertical position. The inner diameter of the through hole is larger than the outer diameter of the valve stem 2. A lower flange 9 is fixed to the lower end of the valve body 1 by an external hexagonal screw. The lower flange 9 blocks the lower end of the through hole. The valve stem 2 is inserted into the through hole, and the lower end of the valve stem 2 abuts against the lower flange 9. The lower flange 9 and the valve body 1 are positioned and installed by an annular stepped surface.

[0061] like Figure 1 As shown, a flow passage 11 is defined in the center of the valve body 1. A disc holder 4 is mounted on at least the portion of the valve stem 2 located at the flow passage 11. A fastening screw passes through the disc holder 4 and is inserted into the valve stem 2. A nut is then screwed in place to secure the disc holder 4 to the valve stem 2. The outer periphery of the disc holder 4 can contact the inner wall of the flow passage 11 to separate it, and can also be rotated by the valve stem 2 to open it. A mounting gap is provided between the valve body 1 and the valve stem 2. The mounting gap above the flow passage 11 is fitted with packing 3 and a bushing 14 from top to bottom. The mounting gap below the flow passage 11 is also fitted with a bushing 14. Sealing rings are installed at the inner surfaces of the two bushings 14 connecting to the valve stem 2 and at the outer surfaces connecting to the valve body 1 to ensure a tight seal. Two sealing rings are also installed at the lower end of the disc holder 4 connecting to the valve stem 2 to ensure a tight seal.

[0062] like Figure 1As shown, the lower end of the valve body 1 away from the packing 3 is also provided with a mounting surface, and the mounting surface and the lower surface of the shaft sleeve 14 below are located at the same horizontal plane, and an anti-slip structure 7 is installed below the valve stem 2, and the anti-slip structure 7 includes: a thrust pad 71, a split ring 72, an anti-blow sleeve 73 and a thrust pad 74; the thrust pad 74 is installed between the bottom surface of the valve stem 2 and the valve body 1, and the thrust pad 71 is an annular component, which is sleeved on the valve stem 2, and an annular groove is opened on the lower end side wall of the valve stem 2, and the split ring 72 is sleeved in the annular groove; the anti-blow sleeve 73 is an annular component, which is sleeved on the valve stem 2 and installed on the upper end of the split ring 72. The split ring 72 abuts the thrust pad 71 against the mounting surface through the anti-blow sleeve 73. Through the above structure, the valve stem 2 is axially positioned to prevent the valve stem 2 from being offset under the pressure of grease injection.

[0063] A pressure plate 111 is sleeved on the upper part of the valve stem 2, and a pressing sleeve 112 is provided below the pressure plate 111. The lower end of the pressing sleeve 112 extends into the installation gap and abuts against the packing 3. The pressure plate 111 provides downward pressure to the pressing sleeve 112 to compress the packing 3.

[0064] like Figures 1 to 8 As shown, the sealing structure includes: a first seal 5 and a second seal 6. The first seal 5 is sleeved on the valve stem 2, and the first seal 5 is arranged between the packing 3 and the shaft sleeve 14 above; the upper and lower ends of the first seal 5 are respectively fitted with the packing 3 and the shaft sleeve 14, the inner surface of the first seal 5 fits the valve stem 2, and the outer surface of the first seal 5 fits the valve body 1. The first sealing member 5 is an annular spacer ring with a first sealing channel defined therein. The first sealing channel comprises a first inner ring groove 51, a first outer ring groove 52, and a first connecting hole 53. The first inner ring groove 51 is provided on the inner surface of the first sealing member 5 near the valve stem 2, while the first outer ring groove 52 is provided on the outer surface of the first sealing member 5 near the valve body 1. Preferably, the first inner ring groove 51 and the first outer ring groove 52 have the same groove width and depth and are located on the same horizontal plane. A plurality of first connecting holes 53 are provided in an array centered on the axis of the first sealing member 5 between the first inner ring groove 51 and the first outer ring groove 52. The first connecting holes 53 are used to connect the first inner ring groove 51 and the first outer ring groove 52. Specifically, at least four, and preferably more than four, first connecting holes 53 are provided. A first grease injection channel 12 is provided on the valve body 1 at the same level as the first outer ring groove 52 and communicates with the first outer ring groove 52. A one-way valve 101 is installed on the inner side of the first grease injection channel 12 close to the valve stem 2 , and a grease injection valve 102 is installed at the injection port away from the valve stem 2 . The grease injection valve 102 is externally connected to a grease injection device.

[0065] As the valve is continuously opened and closed, the multiple frictions between the contact surfaces of the valve stem 2 and the packing 3 cause slight wear on the contact surfaces of the packing 3 and the valve stem 2. In an emergency, when a gap appears at the connection position between the packing 3 and the valve stem 2, resulting in a loss of seal, emergency grease injection is performed through the grease injection device. Grease is injected through the first grease injection channel 12 toward the first outer ring groove 52 through the grease injection valve 102 and the one-way valve 101. The sealing grease will first fill the first outer ring groove 52, and pass through the first connecting hole 53 into the first inner ring groove 51, and fill the gap between the first inner ring groove 51 and the valve stem 2. Under the action of the grease injection pressure, the sealing grease is squeezed toward both sides into the gap between the packing 3 and the valve stem 2 and the gap between the shaft sleeve 14 and the valve stem 2, and fills the gap, thereby realizing the re-sealing of the contact position between the valve stem 2 and the packing 3. At the same time, the unique lubricating effect of the sealing grease reduces the wear between the contact surfaces of the valve stem 2 and the packing 3, and extends the service life of the packing 3.

[0066] The second sealing member 6 is also an annular member, such as Figure 1 and Figure 6 As shown, an annular sealing groove is formed on the right side of the disc holder 4, centered on the axis of the flow channel 11. The second sealing member 6 is an annular member and is sleeved within the sealing groove. The pressure ring 8 is fixed to the disc holder 4 by a hexagon socket screw to secure the second sealing member 6 within the sealing groove. The outer side of the second sealing member 6 contacts the valve body 1, and the connection between the two is arranged at an angle. That is, the outer diameter of the side closer to the valve stem 2 is larger than the outer diameter of the side farther from the valve stem 2.

[0067] like Figure 6 As shown, a second sealing channel is provided in the second sealing member 6, including: a second inner ring groove 61, a second outer ring groove 62 and a second connecting hole 63. The second inner ring groove 61 is opened on the side of the second sealing member 6 close to the valve stem 2 with the axis of the circulation channel 11 as the center; the second outer ring groove 62 is opened on the outer surface of the second sealing member 6 close to the inner wall of the circulation channel 11 with the axis of the circulation channel 11 as the center, that is, the outer opening of the second outer ring groove 62 is fitted with the sealing inclined surface of the valve body 1 and the butterfly plate frame 4; there are a plurality of second connecting holes 63, and the plurality of second connecting holes 63 are evenly distributed between the second inner ring groove 62 and the second outer ring groove 62 with the axis of the circulation channel 11 as the center array to connect the second inner ring groove 62 and the second outer ring groove 62. Preferably, there are at least four second connecting holes 63, and can be more than four.

[0068] like Figure 4 、 Figure 5 and Figure 8As shown, the second grease injection channel 13 includes: a first through hole 131, a second through hole 132, a rod hole 133 and a third through hole 134. The first through hole 131 is opened at the bottom end of the valve body 1 away from the packing 3, and the second through hole 132 is opened at the bottom end of the valve stem 2 corresponding to the first through hole 131. The rod hole 133 is opened on the valve stem 2 along the axial direction of the valve stem 2. The bottom end of the rod hole 133 is connected with the second through hole 132. The third through hole 134 is arranged corresponding to the upper end of the rod hole 133 and horizontally passes through the valve stem 2 and the valve body 1. One end of the third through hole 134 is connected with the upper end of the rod hole 133, and the other end is connected with the second inner ring groove 61. A one-way valve 101 is installed on the inner side of the first through hole 131 near the valve stem 2, and a grease injection valve 102 is installed at the injection port position away from the valve stem 2. The grease injection valve 102 is externally connected to a grease injection device.

[0069] In an emergency, when the position of the butterfly plate frame 4 contacts the inner wall of the circulation channel 11 to isolate the working state of the circulation channel 11, and a gap appears at the connection position between the butterfly plate frame 4 and the valve body 1, resulting in a loss of seal, the grease injection device performs emergency grease injection, and injects grease through the first through hole 131 toward the gap between the valve body 1 and the valve stem 2 through the grease injection valve 102 and the one-way valve 101. The sealing grease will first fill the gap between the valve body 1 and the valve stem 2 and then reseal. As the sealing grease is continuously injected, it will move toward the second through hole 132 and into the rod hole 133. The sealing grease in the rod hole 133 moves upward until it enters the second inner ring groove 61 through the third through hole 134. The sealing grease first fills the second inner ring groove 61 and moves through the second connecting hole 63 to the second outer ring groove 62. Under the action of the grease injection pressure, the sealing grease is squeezed toward both sides into the gap between the second sealing member 6 and the valve body 1, filling the gap and forming a seal. As the sealing grease is continuously injected, it will enter the gap between the valve body 1 and the valve stem 2, and be squeezed into the gap between the valve stem 2 and the shaft sleeve 14. The unique lubricating effect of the sealing grease reduces the wear between the contact surfaces of the valve stem 2 and the shaft sleeve 14, reduces the valve torque, and extends the service life of the valve.

[0070] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A valve, characterized in that: include: A valve body (1), the valve body (1) comprising a circulation channel (11), a valve stem (2) being inserted into the valve body (1), and a filler (3) being filled between the valve body (1) and the valve stem (2); a butterfly plate frame (4) being mounted on at least a portion of the valve stem (2) located in the circulation channel (11), and a peripheral side of the butterfly plate frame (4) being capable of contacting an inner wall of the circulation channel (11) to separate the circulation channel (11); A sealing structure, the sealing structure comprising a first sealing member (5) and a second sealing member (6), the first sealing member (5) being sleeved on the valve stem (2), and the first sealing member (5) being arranged at one end of the packing (3) close to the circulation channel (11); the second sealing member (6) being mounted on the butterfly plate frame (4), and the circumferential side of the second sealing member (6) being adapted to contact the inner wall of the circulation channel (11); The first sealing member (5) is provided with a first sealing channel, and the second sealing member (6) is provided with a second sealing channel; the valve body (1) is provided with a first grease injection channel (12) corresponding to the first sealing channel, and the valve body (1) and the valve stem (2) are provided with a second grease injection channel (13) corresponding to the second sealing channel.

2. The valve according to claim 1, characterized in that The first sealing member (5) is an annular member, and the first sealing member (5) is sleeved on the valve stem (2); The first sealed channel comprises: a first inner annular groove (51), the first inner annular groove (51) being provided on the inner surface of the first sealing member (5) close to the valve stem (2); a first outer annular groove (52), the first outer annular groove (52) being arranged on an outer surface of the first sealing member (5) close to the valve body (1); A first communicating hole (53), wherein a plurality of the first communicating holes (53) are provided, and the plurality of the first communicating holes (53) are evenly distributed between the first inner ring groove (51) and the first outer ring groove (52) to connect the first inner ring groove (51) and the first outer ring groove (52).

3. The valve according to claim 2, characterized in that The first outer ring groove (52) is arranged opposite to the first grease injection channel (12).

4. The valve according to claim 2, characterized in that An annular sealing groove is provided on one side of the butterfly plate frame (4) with the axis of the circulation channel (11) as the center. The second sealing member (6) is an annular member and is sleeved in the sealing groove. The second sealed channel includes: a second inner ring groove (61), the second inner ring groove (61) being opened on a side of the second sealing member (6) close to the valve stem (2) with the axis of the circulation channel (11) as the center; a second outer ring groove (62), the second outer ring groove (62) being opened on the outer surface of the second sealing member (6) close to the inner wall surface of the circulation channel (11) with the axis of the circulation channel (11) as the center; A second communicating hole (63), wherein a plurality of the second communicating holes (63) are provided, and the plurality of the first communicating holes (53) are evenly distributed between the first inner ring groove (51) and the first outer ring groove (52) to connect the second inner ring groove (61) and the second outer ring groove (62).

5. The valve according to claim 4, characterized in that The second inner ring groove (61) is arranged opposite to the second grease injection channel (13).

6. The valve according to claim 5, characterized in that At least four of the first communicating holes (53) and the second communicating holes (63) are provided.

7. The valve according to claim 4, characterized in that The second sealed channel includes: a first through hole (131), the first through hole (131) being opened at an end of the valve body (1) away from the packing (3); a second through hole (132), the second through hole (132) corresponding to the first through hole (131) and provided on the valve stem (2); a rod hole (133), the rod hole (133) being opened on the valve stem (2) along a straight line direction of the axis of the valve stem (2), and the rod hole (133) being in communication with the second through hole (132); A third through hole (134), the third through hole (134) passes through the valve stem (2) and the valve body (1), one end of the third through hole (134) is connected to the stem hole (133), and the other end is relatively communicated with the second inner ring groove (61).

8. The valve according to claim 7, characterized in that The valve body (1) is further provided with a mounting surface at one end away from the packing (3); the valve further comprises an anti-slip structure (7), and the anti-slip structure (7) is mounted between the valve stem (2) and the valve body (1).

9. The valve according to any one of claims 4 to 8, characterized in that: The valve body (1) further comprises a pressure ring (8), wherein the pressure ring (8) is connected to the butterfly plate frame (4) to fix the second sealing member (6) in the sealing groove.

10. The valve according to claim 7, characterized in that The valve body (1) further comprises a one-way valve (101) and a grease injection valve (102), wherein two one-way valves (101) are provided and are respectively arranged in the first grease injection channel (12) and the first through hole (131); The grease injection valves (102) are provided with two and are respectively arranged at the first grease injection channel (12) and the opening end of the first through hole (131) away from the valve stem (2).

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