阅读说明：本技术 一种双密封蝶阀 (Double-seal butterfly valve ) 是由 洪元生 于 2018-07-25 设计创作，主要内容包括：本发明公开了一种双密封蝶阀,包括：阀体,在阀体的内部由上至下依次设置有上阀杆、碟板支撑座、碟板和下阀杆；在碟板支撑座的末端连接有主阀座和副阀座；在碟板支撑座上靠近副阀座的位置上设有一个轨道盘座面,其上设有若干螺栓孔,通过螺栓孔和螺钉的配合把轨道盘固定到轨道盘座面上；在轨道盘的下方设有阀座支撑面,阀座支撑面和碟板密封面连接为一体,形成一个球体面。本发明通过采用活塞式自密封阀座,解决了高压力及大口径的密封隐患问题,并且通过了轨道盘和阀座支撑面对主阀座和副阀座行程中与蝶板密封面离合作用,起到了主、副阀座的双重保险密封作用,达到了大口径都能实现高压密封时的作用；具有双密封、寿命长、耐高压、耐磨损的特点。(The invention discloses a double-seal butterfly valve, which comprises: the valve body is internally provided with an upper valve rod, a disc plate supporting seat, a disc plate and a lower valve rod from top to bottom in sequence; the tail end of the disc plate supporting seat is connected with a main valve seat and an auxiliary valve seat; a track disc seat surface is arranged on the disc plate supporting seat close to the auxiliary valve seat, a plurality of bolt holes are arranged on the track disc seat surface, and the track disc is fixed on the track disc seat surface through the matching of the bolt holes and screws; a valve seat supporting surface is arranged below the track disc, and the valve seat supporting surface and the disc plate sealing surface are connected into a whole to form a spherical surface. The invention solves the problems of high pressure and large-caliber sealing hidden danger by adopting the piston type self-sealing valve seat, and plays a role in double-insurance sealing of the main valve seat and the auxiliary valve seat by the clutch action of the track disc and the valve seat supporting surface on the sealing surface of the butterfly plate in the travel of the main valve seat and the auxiliary valve seat, thereby achieving the function of realizing high-pressure sealing of large caliber; has the characteristics of double sealing, long service life, high pressure resistance and wear resistance.)

1. A dual seal butterfly valve comprising: the valve comprises a valve body (1), wherein an upper valve rod (2), a disc plate supporting seat (3), a disc plate (4) and a lower valve rod (5) are sequentially arranged in the valve body (1) from top to bottom; wherein, the tail end of the disc plate supporting seat (3) is connected with a main valve seat (6) and an auxiliary valve seat (7); a track disc seat surface (31) is arranged on the disc plate supporting seat (3) close to the auxiliary valve seat (7), a plurality of bolt holes (32) are formed in the track disc seat surface, and the track disc (8) is fixed on the track disc seat surface (31) through the matching of the bolt holes (32) and screws (33); a valve seat supporting surface (34) is arranged below the track disc (8), and the valve seat supporting surface (34) and the disc plate sealing surface (35) are connected into a whole to form a spherical surface; it is characterized by also comprising: the disc plate supporting seat (3) is fixed on the valve body (1) through an upper valve rod (2) and a lower valve rod (5); and a packing (9) is filled between the upper valve rod (2) and the lower valve rod (5), the packing (9) is pressed by a gland (10) and a pressing ring (11), and a bolt (12) and a nut (13) are fastened and sealed in the valve body (1).

2. The dual seal butterfly valve according to claim 1, wherein a lower valve cap (51) is provided at the bottom of the lower valve stem (5), the lower valve stem (5) being fixed to the valve body (1) by means of screws (33) inside the lower valve cap (51).

3. The dual seal butterfly valve according to claim 1, wherein the plate (4) is provided with a valve seat support surface (34) integrally formed with a plate sealing surface (35) to form a spherical surface.

4. The dual seal butterfly valve according to claim 1, wherein a primary seal (61), a secondary seal (62), a rail abutment surface (63), a spring (64) and a sealing ring (65) are provided on the primary valve seat (6); and one end of the auxiliary valve seat (7) is provided with an auxiliary seal (71), the spring (64) and a sealing ring (65).

5. The dual seal butterfly valve according to claim 1, wherein an upper stem insertion hole (36) is provided at a central position of the plate support base (3).

Technical Field

The invention relates to the technical field of valves, in particular to a double-seal butterfly valve.

Background

The existing common butterfly valve is provided with a butterfly plate in a valve body, the side face of the butterfly plate is provided with a fixed valve seat, the fixed valve seat is forced to transfer and extrude through the rotation of the butterfly plate to form sealing, the valve seat has no elastic automatic compensation design, the sealing surface is easy to crush, the service life is poor, the torsion is large, the butterfly valve is not high-pressure resistant, the butterfly valve with three eccentric centers and high performance is not high-pressure resistant, the butterfly valve with too large caliber is not easy to manufacture, because the butterfly valve with three eccentric centers is used for shearing and sealing hard metal, the time is long, the stress reaction of the metal leads to the deformation of the metal sealing surface, even if the butterfly valve is not subjected to the scouring or abrasion of a medium, the butterfly valve can not seal, and the original butterfly valve is only provided with one sealing valve seat, and if.

The traditional center line butterfly valve is formed by embedding a rubber sleeve into a metal valve body, a middle butterfly plate and the rubber sleeve form sealing, the medium pressure can be born too low to be used on medium-high pressure fluid, the rubber can not be used at high temperature due to limited bearing temperature, the rubber can be aged in a certain period of time, and the service life is too short.

The existing eccentric butterfly valve is sealed by a metal valve body and an eccentric butterfly plate, and due to the fact that the structure design is hard-to-hard sealing, the existing eccentric butterfly valve is difficult to process, cannot bear too high pressure in the sealing aspect, is large in torsion and cannot be too long in service life.

Therefore, how to provide a dual-seal butterfly valve with the characteristics of excellent sealing performance, long service life, high pressure resistance, wear resistance, difficult deformation and the like is a problem which needs to be solved urgently by the technical personnel in the field.

Disclosure of Invention

In view of the above, the invention provides a double-seat butterfly valve which has the characteristics of excellent sealing performance, long service life, high pressure resistance, wear resistance, difficult deformation and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

a dual seal butterfly valve comprising: the valve comprises a valve body, wherein an upper valve rod, a disc plate supporting seat, a disc plate and a lower valve rod are sequentially arranged in the valve body from top to bottom; wherein, the tail end of the disc plate supporting seat is connected with a main valve seat and an auxiliary valve seat; a track disc seat surface is arranged on the disc plate supporting seat and close to the auxiliary valve seat, a plurality of bolt holes are formed in the track disc seat surface, and the track disc is fixed on the track disc seat surface through the matching of the bolt holes and screws; a valve seat supporting surface is arranged below the track disc, and the valve seat supporting surface and the disc plate sealing surface are connected into a whole to form a spherical surface; it is characterized by also comprising: the disc plate supporting seat is fixed on the valve body through an upper valve rod and a lower valve rod; and packing is filled between the upper valve rod and the lower valve rod and is compressed by a gland and a pressing ring, and the packing is fastened and sealed in the valve body by bolts and nuts.

Preferably, in the above double-sealing butterfly valve, a lower valve cover is provided at a bottom cover of the lower valve rod, and the lower valve rod is fixed to the valve body by a screw inside the lower valve cover.

Preferably, in the above dual-seal butterfly valve, the disk plate has a valve seat supporting surface integrally connected with the disk plate sealing surface to form a spherical surface

Preferably, in the above-mentioned double-seal butterfly valve, a main seal, an auxiliary seal, a rail abutment surface, a spring and a seal ring are provided on the main valve seat; and one end of the auxiliary valve seat is provided with an auxiliary seal, the spring and a sealing ring.

Preferably, in the above double seal butterfly valve, an upper stem insertion hole is provided at a central position of the disk support base.

Compared with the prior art, the technical scheme has the advantages that:

(1) the upper valve rod and the lower valve rod are controlled to rotationally drive the butterfly plate supporting seat, the butterfly plate, the track disc and the auxiliary valve seat supporting surface, when the butterfly plate supporting seat, the track disc and the auxiliary valve seat are rotated to a closed position, the sealing surfaces on the main valve seat and the auxiliary valve seat are tightly attached to the sealing surface of the butterfly plate on the butterfly plate, and the higher the double sealing pressure is, the better the sealing performance is;

(2) the supporting seat behind the main valve seat and the auxiliary valve seat can be formed by processing a valve body, or can be formed by adopting an independent supporting seat, welding, threaded connection and the like, and in the rotating process, the auxiliary valve seat plays a role in cleaning the sealing surface of the butterfly plate to protect the main valve seat from being scratched by impurities on the butterfly plate when the main valve seat is closed in place, and also plays a role in sealing;

(3) when the main valve seat is in an opening state in the opening process, the main valve seat seal is separated from the butterfly plate seal surface, so that abrasion is avoided, the service life is prolonged, and in a full opening state and rotation, the main valve seat retracts a certain distance under the pushing-away action of the track plate, is more effectively protected by the auxiliary valve seat, and avoids reducing medium scouring or damage;

(4) when the butterfly valve is closed in place, the main valve seat and the auxiliary valve seat are tightly attached to a sealing surface of the butterfly plate under the action of the thrust of the spring and a medium to form sealing, the higher the pressure is, the larger the thrust is, the tighter the sealing is, the double-sealing safety and reliability function is realized, the main valve seat can be safely sealed under the protection of the auxiliary valve seat, the higher the pressure is, the better the sealing is, the automatic compensation for sealing abrasion is realized, and the butterfly valve is more suitable for various occasions with high requirements and the requirements of the buried long-distance pipeline for maintenance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of the invention.

FIG. 2 is a partial enlarged view of the drawing A-1 of the present invention.

Fig. 3 is a front view of the main valve seat of the present invention.

Fig. 4 is a rear view of the main valve seat of the present invention.

FIG. 5 is a cross-sectional view of the main valve seat of the present invention.

FIG. 6 is a front view of the auxiliary valve seat of the present invention.

FIG. 7 is a rear view of the secondary seat of the present invention.

FIG. 8 is a cross-sectional view of the secondary seat of the present invention.

Fig. 9 is a side view of a dish plate of the present invention.

FIG. 10 is a top view of the disk plate of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a double-seat butterfly valve which has the characteristics of excellent sealing performance, long service life, high pressure resistance, wear resistance, difficult deformation and the like.

Referring to the drawings, the invention discloses a double-seal butterfly valve, which specifically comprises:

the valve comprises a valve body 1, wherein an upper valve rod 2, a disc plate supporting seat 3, a disc plate 4 and a lower valve rod 5 are sequentially arranged in the valve body 1 from top to bottom; wherein, the end of the disc plate supporting seat 3 is connected with a main valve seat 6 and an auxiliary valve seat 7; a rail disc seat surface 31 is arranged on the disc plate supporting seat 3 close to the auxiliary valve seat 7, a plurality of bolt holes 32 are arranged on the rail disc seat surface 31, and the rail disc 8 is fixed on the rail disc seat surface 31 through the matching of the bolt holes 32 and screws 33; a valve seat supporting surface 34 is arranged below the track disc 8, and the valve seat supporting surface 34 and the disc plate sealing surface 35 are connected into a whole to form a spherical surface; it is characterized by also comprising: the disc plate supporting seat 3 is fixed on the valve body 1 through an upper valve rod 2 and a lower valve rod 5; packing 9 is filled between the upper valve rod 2 and the lower valve rod 5, the packing 9 is pressed by a gland 10 and a pressing ring 11, and a bolt 12 and a nut 13 are fastened and sealed in the valve body 1.

In order to further optimize the technical scheme, a lower valve cap 51 is covered at the bottom of the lower valve rod 5, and the lower valve rod 5 is fixed on the valve body 1 through a screw 33 inside the lower valve cap 51.

In order to further optimize the above technical solution, the valve seat supporting surface 34 provided on the disk plate 4 is connected with the disk plate sealing surface 35 into a whole to form a spherical surface.

In order to further optimize the technical scheme, a main seal 61, an auxiliary seal 62, a track abutting surface 63, a spring 64 and a sealing ring 65 are arranged on the main valve seat 6; a sub seal 71, a spring 64, and a seal ring 65 are provided at one end of the sub valve seat 7.

In order to further optimize the above technical solution, an upper valve stem insertion hole 36 is provided at a central position of the disc support base 3.

In order to further optimize the technical scheme, the specific working principle is as follows: when the butterfly valve is opened, the butterfly plate supporting seat, the butterfly plate sealing surface, the valve seat supporting surface and the track disc are driven by controlling and rotating the upper valve rod and the lower valve rod; in the rotation process, the track disc pushes the track butt joint surface on the main valve seat to separate the main valve seat from the sealing surface of the spiral plate, and the valve seat supporting surface and the auxiliary valve seat rotate to an opening state in a close contact state; when the butterfly valve is closed, the upper valve rod and the lower valve rod are controlled to rotationally drive the butterfly plate supporting seat, the butterfly plate, the track disc and the valve seat supporting surface, and when the butterfly valve is rotated to a closed position, the sealing surfaces on the main valve seat and the auxiliary valve seat are tightly attached to the sealing surface of the butterfly plate on the butterfly plate to form double sealing pressure, so that the higher the sealing pressure is, the better the sealing performance is.

The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples are intended to illustrate several embodiments of the present invention, and the description is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.