Two-way self sealss device of two eccentric butterfly valve hard seal dish board
阅读说明：本技术 一种双偏心蝶阀硬密封碟板双向自密封装置 (Two-way self sealss device of two eccentric butterfly valve hard seal dish board ) 是由 洪荣坤 洪永金 刘杰 张正龙 于 2020-07-15 设计创作，主要内容包括：本发明创造提供了一种双偏心蝶阀硬密封碟板双向自密封装置,包括蝶板、蝶板上固定的压板、以及蝶板上安装的换向阀；换向阀包括换向阀体以及换向阀体内的阀芯；在密封安装腔内设有阀板硬密封,该阀板硬密封包括安装部和密封部,安装部置于密封安装腔内,密封部经蝶板与压板间开口伸出的一端与阀座形成密封；开口宽度大于密封部厚度,当密封部抵住蝶板时,安装部与第一凹槽的槽底间具有间隙。本发明创造中,无论介质的流向为左介质腔体向右介质腔体还是右介质腔体向左介质腔体,压力介质均能够经第三通道进入密封安装腔,对阀门密封端部形成作用力,实现自密封,有效改善现有技术中密封容易磨损失效的弊端,密封使用寿命长,密封可靠性高。(The invention provides a bidirectional self-sealing device for a hard sealing disc plate of a double-eccentric butterfly valve, which comprises a butterfly plate, a pressing plate fixed on the butterfly plate and a reversing valve arranged on the butterfly plate; the reversing valve comprises a reversing valve body and a valve core in the reversing valve body; a valve plate hard seal is arranged in the seal mounting cavity and comprises a mounting part and a sealing part, the mounting part is arranged in the seal mounting cavity, and the sealing part forms seal with the valve seat through one end of the butterfly plate, which extends out of the opening between the butterfly plate and the pressure plate; the width of the opening is larger than the thickness of the sealing part, and when the sealing part props against the butterfly plate, a gap is formed between the mounting part and the groove bottom of the first groove. In the invention, no matter the medium flows to the left medium cavity, the right medium cavity or the right medium cavity and the left medium cavity, the pressure medium can enter the seal installation cavity through the third channel to form acting force on the seal end part of the valve, so that self-sealing is realized, the defect that the seal is easy to wear and lose efficacy in the prior art is effectively overcome, the service life of the seal is long, and the seal reliability is high.)
1. The utility model provides a two-way self sealing device of two eccentric butterfly valve hard seal dish board which characterized in that: comprises a butterfly plate, a pressure plate fixed on the butterfly plate and a reversing valve arranged on the butterfly plate; the reversing valve comprises a reversing valve body and a valve core in the reversing valve body, wherein the left end of the reversing valve body is provided with a first inlet, the right end of the reversing valve body is provided with a second inlet, and the middle part of the reversing valve body is provided with an outlet;
the valve core comprises a sealing section, a first matching section and a second matching section, wherein two sides of the sealing section are respectively matched with the first inlet, the second matching section is matched with the second inlet, the diameter of the sealing section is larger than that of the first matching section and the second matching section, the diameter of the first matching section is smaller than the inner diameter of the first inlet, and the diameter of the second matching section is smaller than that of the second inlet;
the butterfly plate is provided with a first channel communicated with the first inlet and a third channel communicated with the outlet, the pressing plate is provided with a second channel communicated with the second inlet, the butterfly plate is provided with a first groove, the pressing plate is provided with a second groove, a sealing installation cavity is formed between the two grooves, and the third channel is communicated with the bottom of the first groove;
a valve plate hard seal is arranged in the seal mounting cavity and comprises a mounting part and a sealing part, the mounting part is arranged in the seal mounting cavity, and the sealing part forms seal with the valve seat through one end of the butterfly plate, which extends out of the opening between the butterfly plate and the pressure plate; the width of the opening is larger than the thickness of the sealing part, and when the sealing part props against the butterfly plate, a gap is formed between the mounting part and the groove bottom of the first groove.
2. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 1, characterized in that: and sealing elements are respectively arranged on two sides of the sealing section.
3. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 2, characterized in that: the sealing element is an O-shaped ring.
4. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 2, characterized in that: one end of the first matching section close to the sealing section and one end of the second matching section close to the sealing section are respectively provided with a sealing groove, and the sealing element is arranged in the sealing groove.
5. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 1, characterized in that: the conical surface of the valve seat is provided with a metal ring, and one end of the valve plate extending out of the seal installation cavity in a hard seal mode props against the surface of the metal ring.
6. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 5, characterized in that: and a sealing pressing ring is arranged between the metal ring and the conical surface.
7. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 6, characterized in that: and an annular groove is formed in the conical surface of the valve seat, and the sealing pressing ring is arranged in the annular groove.
8. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 1, characterized in that: the thickness of the hard sealing mounting part of the valve plate is larger than that of the sealing part.
9. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 1, characterized in that: an auxiliary sealing structure is arranged between the butterfly plate and the pressing plate and is close to the sealing containing cavity.
10. The double-eccentric butterfly valve hard seal disc bidirectional self-sealing device according to claim 9, characterized in that: the auxiliary sealing structure comprises an auxiliary sealing groove formed in the pressing plate, and a sealing ring is installed in the auxiliary sealing groove.
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a bidirectional self-sealing device for a hard sealing disc of a double-eccentric butterfly valve.
Background
The double-eccentric half butterfly valve sealing structure adopts an eccentric wedging principle, achieves the purposes of tight gate and closing of the valve plate sealing ring and the valve seat through the transmission mechanism, the valve plate sealing ring is in contact with the sealing surface of the valve seat, but in the closing process, mutual friction exists between the valve plate sealing ring and the valve seat, damage to the valve plate sealing ring is easily caused, sealing failure of the double-eccentric half butterfly valve sealing pair is caused, and the valve is not closed tightly. Meanwhile, in the butterfly valve using the hard seal on the butterfly plate, the tightness between the seal and the valve seat cannot be improved by means of tensioning, so that the improvement of the seal structure of the butterfly valve using the hard seal is needed.
Disclosure of Invention
In view of the above, the present invention provides a bidirectional self-sealing device for a hard sealing disk of a double-eccentric butterfly valve, which aims to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a double-eccentric butterfly valve hard seal disc plate bidirectional self-sealing device comprises a butterfly plate, a pressing plate fixed on the butterfly plate, and a reversing valve arranged on the butterfly plate; the reversing valve comprises a reversing valve body and a valve core in the reversing valve body, wherein the left end of the reversing valve body is provided with a first inlet, the right end of the reversing valve body is provided with a second inlet, and the middle part of the reversing valve body is provided with an outlet;
the valve core comprises a sealing section, a first matching section and a second matching section, wherein two sides of the sealing section are respectively matched with the first inlet, the second matching section is matched with the second inlet, the diameter of the sealing section is larger than that of the first matching section and the second matching section, the diameter of the first matching section is smaller than the inner diameter of the first inlet, and the diameter of the second matching section is smaller than that of the second inlet;
the butterfly plate is provided with a first channel communicated with the first inlet and a third channel communicated with the outlet, the pressing plate is provided with a second channel communicated with the second inlet, the butterfly plate is provided with a first groove, the pressing plate is provided with a second groove, a sealing installation cavity is formed between the two grooves, and the third channel is communicated with the bottom of the first groove;
a valve plate hard seal is arranged in the seal mounting cavity and comprises a mounting part and a sealing part, the mounting part is arranged in the seal mounting cavity, and the sealing part forms seal with the valve seat through one end of the butterfly plate, which extends out of the opening between the butterfly plate and the pressure plate; the width of the opening is larger than the thickness of the sealing part, and when the sealing part props against the butterfly plate, a gap is formed between the mounting part and the groove bottom of the first groove.
Furthermore, sealing elements are respectively installed on two sides of the sealing section.
Further, the sealing element is an O-shaped ring.
Furthermore, the one end that first cooperation section is close to the seal segment, and the one end that second cooperation section is close to the seal segment are equipped with the seal groove respectively, and the sealing member is installed in the seal groove.
Furthermore, a metal ring is arranged on the conical surface of the valve seat, and one end of the valve plate extending out of the seal installation cavity in a hard seal mode props against the surface of the metal ring.
Furthermore, a sealing pressing ring is arranged between the metal ring and the conical surface.
Furthermore, a ring groove is arranged on the conical surface of the valve seat, and the sealing pressing ring is arranged in the ring groove.
Further, the thickness of the hard sealing mounting part of the valve plate is larger than that of the sealing part.
Furthermore, an auxiliary sealing structure is arranged between the butterfly plate and the pressing plate and is close to the sealing accommodating cavity.
Furthermore, the auxiliary sealing structure comprises an auxiliary sealing groove formed in the pressing plate, and a sealing ring is installed in the auxiliary sealing groove.
Compared with the prior art, the invention has the following advantages:
the valve plate hard seal structure has reasonable structural design, and forms acting force for hard seal of the valve plate through the pressure difference of the first channel communicated with the left medium cavity and the second channel communicated with the right medium cavity, so that no matter the flow direction of a medium is the left medium cavity, the right medium cavity or the left medium cavity, a pressure medium can enter the seal installation cavity through the third channel, and forms acting force on the seal end part of the valve, so that the conical surface of the hard seal end part of the valve plate is tightly attached to the valve seat, meanwhile, the side surface of the seal part is close to the side wall of the opening, self-sealing is realized, the defect that the seal is easy to wear and lose efficacy in the prior art is effectively overcome, the seal service life is long.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is a schematic view of the valve plate of FIG. 2 with the seal ring removed;
fig. 4 is a schematic view of a diverter valve in an embodiment of the invention.
Description of reference numerals:
1-a butterfly plate; 2-pressing a plate; 3-a reversing valve; 4-a valve stem; 5-a drive mechanism; 6-a reversing valve body; 7-a valve core; 8-a first inlet; 9-a second inlet; 10-an outlet; 11-a sealing section; 12-a first mating segment; 13-a second mating segment; 14-a first channel; 15-a third channel; 16-a second channel; 17-a first groove; 18-a second groove; 19-hard sealing of the valve plate; 20-a mounting portion; 21-a sealing part; 22-an opening; 23-a metal ring; 24-sealing a pressing ring; 25-a sealing ring; 26-sealing the installation cavity; 28-seal.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A two-way self-sealing device of a hard sealing disc plate of a double-eccentric butterfly valve is shown in figures 1 to 4 and comprises a butterfly plate 1, a pressing plate 2 fixed on the butterfly plate and a reversing
the end of the valve rod, which is positioned outside the valve body, is provided with the driving mechanism 5, the valve rod is driven to rotate through the driving mechanism, and the butterfly plate is further driven to reach a closed position, and then the self-sealing device can effectively play a sealing role, namely, the hard sealing of the valve plate is pushed by liquid pressure to move towards the conical minimum end of the conical valve seat, the conical top of the hard sealing of the valve plate is tightly attached to the conical sealing surface of the valve seat, and the higher the pressure in the valve is, the better the self-sealing capability of the hard sealing of the valve;
the reversing valve comprises a reversing valve body 6 and a valve core 7 in the reversing valve body, wherein the left end of the reversing valve body is provided with a first inlet 8, the right end of the reversing valve body is provided with a second inlet 9, and the middle part of the reversing valve body is provided with an outlet 10; it should be noted that, the reversing valve body and the two ends are respectively provided with a sealing ring for sealing with the butterfly plate and the pressing plate, so as to ensure the sealing performance between the reversing valve body and the mounting groove thereof.
The valve core comprises a sealing section 11, a first matching section 12 and a second matching section 13, wherein the two sides of the sealing section are respectively matched with the first inlet, the second matching section is matched with the second inlet, the diameter of the sealing section is larger than that of the first matching section and that of the second matching section, the diameter of the first matching section is smaller than that of the first inlet, and the diameter of the second matching section is smaller than that of the second inlet;
a
a valve plate
the width of the opening is larger than the thickness of the sealing part (along the axial direction of the valve), when the sealing part abuts against (the opening part of) the butterfly plate, a gap is formed between the mounting part and the groove bottom of the first groove, and the thickness of the mounting part of the hard seal of the valve plate is larger than that of the sealing part, so that the fluid flowing into the seal mounting cavity through the third channel can abut against the left side (namely the side facing the butterfly plate) of the hard seal of the valve plate.
In order to ensure the sealing performance between the valve core and the reversing valve body, sealing elements 28 are respectively arranged on two sides of the sealing section. Typically, the seal is an O-ring. For example, a sealing groove is respectively formed at one end of the first fitting section close to the sealing section and one end of the second fitting section close to the sealing section, and the sealing element is installed in the sealing groove.
Typically, a
A sealing pressing
In order to improve the sealing performance of the seal installation cavity 26 formed between the butterfly plate and the pressure plate and avoid fluid leakage from the joint of the butterfly plate and the pressure plate, in an alternative embodiment, an auxiliary sealing structure is arranged between the butterfly plate and the pressure plate at a position close to the seal accommodating cavity. For example, the auxiliary sealing structure includes an auxiliary sealing groove formed in the pressure plate, and a
The working principle is as follows: when the fluid medium of the valve flows forwards (left → right), the disc plate is driven to reach the closing position through the driving mechanism, the fluid medium in the valve is injected (Venturi principle), the pressure difference occurs between the middle end and the outlet end of the valve, the pressure value of the first channel is higher than that of the second channel, and at the moment, the reversing valve connects the first channel with the third channel. The pressure medium at the middle end of the valve (communicated through the first channel and the third channel) flows into a self-sealing control cavity (namely a sealing installation cavity) formed by the butterfly plate, the valve plate hard seal and the pressing plate.
The pressure medium in the cavity pushes the valve plate to be sealed hard and moves towards the direction of the conical minimum end of the conical valve seat, and the conical top of the valve plate hard seal is tightly attached to the conical sealing surface of the valve seat. The higher the pressure in the valve, the better the self-sealing capability of the hard seal of the valve plate. Meanwhile, mutual friction does not exist between the hard seal of the valve plate and the valve seat in the process, the valve seal pair cannot be abraded, and the service life of the valve is effectively prolonged.
Similarly, when the fluid medium of the valve flows reversely (right → left), the disc plate reaches the closing position in the closing process of the valve, the fluid medium in the valve is injected (Venturi principle), the pressure difference occurs between the reverse end and the middle end of the valve, the pressure value of the second channel is higher than that of the first channel, and the reversing valve can connect the third channel with the second channel. The pressure medium at the reverse end of the valve flows into a self-sealing control cavity (namely a sealing installation cavity) formed by the butterfly plate, the valve plate hard seal and the valve plate pressing plate (through the second channel and the third channel).
The pressure medium in the cavity pushes the valve plate hard seal to move towards the conical minimum end direction of the conical valve seat, the conical top of the valve plate hard seal is tightly attached to the conical sealing surface of the valve seat, and the higher the pressure is, the better the valve self-seal is. In conclusion, even if a small amount of abrasion occurs in the contact process of the hard seal of the valve plate and the valve seat after long-term use, the sealing effect cannot be influenced completely under the structural form design and the working principle created by the invention.
The valve plate hard seal structure has reasonable structural design, and forms acting force for hard seal of the valve plate through the pressure difference of the first channel communicated with the left medium cavity and the second channel communicated with the right medium cavity, so that no matter the flow direction of a medium is the left medium cavity, the right medium cavity or the left medium cavity, a pressure medium can enter the seal installation cavity through the third channel, and forms acting force on the seal end part of the valve, so that the conical surface of the hard seal end part of the valve plate is tightly attached to the valve seat, meanwhile, the side surface of the seal part is close to the side wall of the opening, self-sealing is realized, the defect that the seal is easy to wear and lose efficacy in the prior art is effectively overcome, the seal service life is long.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
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