1. A multi-compound sealing valve rod for preventing leakage of the valve rod, which is characterized in that,

the multiple composite sealing valve rod leakage-proof valve rod comprises a valve cover, a valve rod, a first sealing mechanism, a first sealing part, a second sealing mechanism, a second sealing part, a third sealing mechanism and a third sealing part, wherein a sealing groove is formed in the valve cover, the valve rod penetrates through the valve cover and is positioned in the sealing groove, the first sealing mechanism, the first sealing part, the second sealing mechanism, the second sealing part and the third sealing mechanism are sequentially arranged in the sealing groove from bottom to top, the third sealing part is in threaded connection with the valve cover and is positioned at the end part of the valve cover, a first sealing part, a second sealing part and a third sealing part are sequentially arranged in the valve rod from bottom to top, the first sealing part is fixedly connected with the valve rod, and the second sealing part and the third sealing part are both in sliding connection with the valve rod, the lower end of the first sealing part is attached to the first sealing mechanism, the upper end of the first sealing part is attached to the first tight part, the lower end of the second sealing part is attached to the second sealing mechanism, the upper end of the second sealing part is attached to the second tight part, the lower end of the third sealing part is attached to the third sealing mechanism, and a press-fitting mechanism is arranged between the upper end of the third sealing part and the inner top of the third tight part.

2. The multiple compound seal stem leak proof valve stem of claim 1,

first sealing mechanism includes axle sleeve and V type sealing washer, the axle sleeve cover is established the outside of valve rod, and is located the bottom of seal groove, the one end of V type sealing washer with the top of axle sleeve is laminated mutually, the other end of V type sealing washer with the bottom of first closed part is laminated mutually.

3. The multiple compound seal stem leak proof valve stem of claim 2,

the number of the V-shaped sealing rings is multiple, and the V-shaped sealing rings are sequentially overlapped between the shaft sleeve and the first closing piece.

4. The multiple compound seal stem leak proof valve stem of claim 3,

the second sealing mechanism includes a plurality of O-rings that are sequentially stacked between the first and second closure members.

5. The multiple compound seal stem leak proof valve stem of claim 4,

the third sealing mechanism comprises a plurality of graphite woven sealing rings, and the graphite woven sealing rings are sequentially overlapped between the second sealing member and the third sealing member.

6. The processing technology of the multiple composite sealing valve rod leakage prevention type valve rod according to claim 5 is characterized by comprising the following steps:

when the valve rod is manufactured, the first closing piece and the rod body of the valve rod are manufactured by adopting an integral forming technology;

after the shaft sleeve is filled in the sealing groove, sequentially placing a plurality of V-shaped sealing rings in the sealing groove along the inner wall of the sealing groove, and then inserting the valve rod to enable the first closing piece to be tightly attached to the V-shaped sealing ring at the uppermost end;

sleeving the first tightening piece on the valve rod, and sliding downwards along the inner wall of the sealing groove to enable the first tightening piece to be attached to the upper end of the first sealing piece;

sleeving a plurality of O-shaped sealing rings on the valve rod, sliding the O-shaped sealing rings into the sealing groove to enable the O-shaped sealing ring at the bottommost part to be attached to the first tight part, and sleeving the second sealing part on the valve rod to enable the O-shaped sealing ring at the topmost part to be attached to the bottom of the second sealing part;

sleeving the second tightening piece on the valve rod, and sliding downwards along the inner wall of the sealing groove to enable the second tightening piece to be attached to the upper end of the second sealing piece;

sleeving a plurality of graphite woven sealing rings on the valve rod, sliding the graphite woven sealing rings into the sealing groove to enable the graphite woven sealing ring at the bottommost part to be attached to the second tight part, and sleeving the third sealing part on the valve rod to enable the graphite woven sealing ring at the topmost part to be attached to the bottom of the third sealing part;

and screwing the third tightening piece at the end part of the valve cover so that the output end of the press-fitting mechanism is attached to the third sealing piece.

Background

In a conventional valve, a valve rod is usually sealed by a V-shaped packing group.

However, when the valve is used, the valve rod packing of the valve is worn in the process of screwing the high-frequency switch, the external sealing performance of the valve rod of the valve is reduced, and process gas leaks to the atmosphere from the valve rod packing, so that potential safety hazards are generated.

Disclosure of Invention

The invention aims to provide a multiple-composite-sealing valve rod capable of preventing leakage of the valve rod and a processing technology thereof, and solves the problems that in the use process of a valve in the prior art, a valve rod filler of the valve is worn in the process of screwing a high-frequency switch, and the external sealing performance of the valve rod is reduced.

In order to achieve the above object, the present invention provides a multiple compound sealing valve rod leakage prevention valve rod, which includes a valve cap, a valve rod, a first sealing mechanism, a first sealing member, a second sealing mechanism, a second sealing member, a third sealing mechanism and a third sealing member, wherein a sealing groove is provided inside the valve cap, the valve rod penetrates through the valve cap and is located inside the sealing groove, the first sealing mechanism, the first sealing member, the second sealing mechanism, the second sealing member and the third sealing mechanism are sequentially provided inside the sealing groove from bottom to top, the third sealing member is in threaded connection with the valve cap and is located at an end of the valve cap, the valve rod is sequentially provided with a first sealing member, a second sealing member and a third sealing member from bottom to top, the first sealing member is fixedly connected with the valve rod, the second sealing element and the third sealing element are both connected with the valve rod in a sliding mode, the lower end of the first sealing element is attached to the first sealing mechanism, the upper end of the first sealing element is attached to the first tight piece, the lower end of the second sealing element is attached to the second sealing mechanism, the upper end of the second sealing element is attached to the second tight piece, the lower end of the third sealing element is attached to the third sealing mechanism, and a press-fitting mechanism is arranged between the upper end of the third sealing element and the inner top of the third tight piece.

Firstly, after the first sealing mechanism is placed in the sealing groove, the valve rod is inserted to enable the first sealing piece to be attached to the first sealing mechanism, then the first sealing piece, the second sealing mechanism, the second sealing piece, the second tightening piece and the third sealing mechanism are sequentially sleeved outside the valve rod and placed inside the sealing groove, the third tightening piece is installed at the end part of the valve cover, in the screwing process, the third sealing piece is applied with force through the press-fitting mechanism, so that all the sealing mechanisms in the sealing groove are tightly attached to each other, and when the first sealing mechanism, the second sealing mechanism and the third sealing mechanism are sequentially damaged, one sealing mechanism plays a sealing role in the sealing groove according to the screwing degree of the third tightening piece, so that the valve rod always keeps good sealing performance.

The first sealing mechanism comprises a shaft sleeve and a V-shaped sealing ring, the shaft sleeve is arranged outside the valve rod and located at the bottom of the sealing groove, one end of the V-shaped sealing ring is attached to the top of the shaft sleeve, and the other end of the V-shaped sealing ring is attached to the bottom of the first sealing element.

Firstly, the shaft sleeve is placed at the bottom of the sealing groove, and then the V-shaped sealing ring is placed above the shaft sleeve, so that the first sealing mechanism is installed.

The number of the V-shaped sealing rings is multiple, and the V-shaped sealing rings are sequentially overlapped between the shaft sleeve and the first closing piece.

The quantity of V type sealing washer is a plurality of for the leakproofness of multiple compound seal valve rod leakage formula valve rod is better.

Wherein the second sealing mechanism comprises a plurality of O-rings which are sequentially overlapped between the first and second closure members.

The number of the O-shaped sealing rings is multiple, so that the multiple composite sealing valve rod leakage prevention type valve rod is better in sealing performance.

The third sealing mechanism comprises a plurality of graphite braided sealing rings, and the graphite braided sealing rings are sequentially overlapped between the second sealing member and the third sealing member.

The graphite braided sealing rings are multiple in number, so that the multiple composite sealing valve rod leakage prevention type valve rod is better in sealing performance.

The invention also provides a processing technology of the multiple composite sealing valve rod leakage prevention type valve rod, which comprises the following steps:

when the valve rod is manufactured, the first closing piece and the rod body of the valve rod are manufactured by adopting an integral forming technology;

after the shaft sleeve is filled in the sealing groove, sequentially placing a plurality of V-shaped sealing rings in the sealing groove along the inner wall of the sealing groove, and then inserting the valve rod to enable the first closing piece to be tightly attached to the V-shaped sealing ring at the uppermost end;

sleeving the first tightening piece on the valve rod, and sliding downwards along the inner wall of the sealing groove to enable the first tightening piece to be attached to the upper end of the first sealing piece;

sleeving a plurality of O-shaped sealing rings on the valve rod, sliding the O-shaped sealing rings into the sealing groove to enable the O-shaped sealing ring at the bottommost part to be attached to the first tight part, and sleeving the second sealing part on the valve rod to enable the O-shaped sealing ring at the topmost part to be attached to the bottom of the second sealing part;

sleeving the second tightening piece on the valve rod, and sliding downwards along the inner wall of the sealing groove to enable the second tightening piece to be attached to the upper end of the second sealing piece;

sleeving a plurality of graphite woven sealing rings on the valve rod, sliding the graphite woven sealing rings into the sealing groove to enable the graphite woven sealing ring at the bottommost part to be attached to the second tight part, and sleeving the third sealing part on the valve rod to enable the graphite woven sealing ring at the topmost part to be attached to the bottom of the third sealing part;

and screwing the third tightening piece at the end part of the valve cover so that the output end of the press-fitting mechanism is attached to the third sealing piece.

The invention relates to a multiple composite sealing valve rod leakage-proof valve rod and a processing technology thereof, wherein a first sealing mechanism, a first tight piece, a second sealing mechanism, a second tight piece and a third sealing mechanism are sequentially arranged in a sealing groove from bottom to top, the third tight piece is in threaded connection with a valve cover and is positioned at the end part of the valve cover, firstly, after the first sealing mechanism is arranged in the sealing groove, the valve rod is inserted to enable a first sealing piece to be attached to the first sealing mechanism, then, the first sealing piece, the second sealing mechanism, the second sealing piece, the second tight piece and the third sealing mechanism are sequentially sleeved outside the valve rod and are arranged inside the sealing groove, the third tight piece is arranged at the end part of the valve cover, in the screwing process, through the press-fitting mechanism, the third sealing element is applied with force, so that each sealing mechanism in the sealing groove is tightly attached, when the first sealing mechanism, the second sealing mechanism and the third sealing mechanism are sequentially damaged, one sealing mechanism plays a sealing role on the sealing groove all the time according to the screwing degree of the third sealing element, and the valve rod always keeps good sealing performance.

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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a side view of a multiple composite seal stem leak proof valve stem provided by the present invention.

Fig. 2 is a sectional view of the internal structure taken along line a-a of fig. 1 according to the present invention.

Fig. 3 is an enlarged view of a portion of the structure of fig. 2 a according to the present invention.

Figure 4 is a schematic illustration of the valve stem and third packing provided by the present invention in a disassembled configuration.

Fig. 5 is an enlarged view of a portion of the structure of fig. 4 a according to the present invention.

FIG. 6 is a flow chart of the steps of a process for manufacturing a multiple composite seal stem leak-proof valve stem according to the present invention.

The sealing device comprises a valve cover 1, a sealing groove 11, a dust ring 12, a valve rod 2, a first sealing piece 21, a connecting ring 211, a first enclosing plate 212, a first sealing ring 213, a second sealing piece 22, a third sealing piece 23, a pressing groove 231, a first sealing mechanism 3, a shaft sleeve 31, a sealing ring 32-V, a first sealing piece 4, a cover plate 41, a clamping plate 42, a second sealing mechanism 5, a sealing ring 51-O, a second sealing piece 6, a third sealing mechanism 7, a graphite braided sealing ring 71, a third sealing piece 8, a pressing mechanism 9, a connecting column 91 and a pressing plate 92.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to 5, the present invention provides a multiple-compound-sealing leakage-proof valve rod 2, wherein the multiple-compound-sealing leakage-proof valve rod 2 includes a valve cap 1, a valve rod 2, a first sealing mechanism 3, a first sealing member 4, a second sealing mechanism 5, a second sealing member 6, a third sealing mechanism 7 and a third sealing member 8, a sealing groove 11 is disposed inside the valve cap 1, the valve rod 2 penetrates through the valve cap 1 and is located inside the sealing groove 11, the first sealing mechanism 3, the first sealing member 4, the second sealing mechanism 5, the second sealing member 6 and the third sealing mechanism 7 are sequentially disposed inside the sealing groove 11 from bottom to top, the third sealing member 8 is in threaded connection with the valve cap 1 and is located at an end of the valve cap 1, and the valve rod 2 is sequentially disposed from bottom to top with a first sealing member 21, a second sealing member 6 and a third sealing member 7, The first sealing element 21 is fixedly connected with the valve rod 2, the second sealing element 22 and the third sealing element 23 are both connected with the valve rod 2 in a sliding manner, the lower end of the first sealing element 21 is attached to the first sealing mechanism, the upper end of the first sealing element 21 is attached to the first sealing element 4, the lower end of the second sealing element 22 is attached to the second sealing mechanism 5, the upper end of the second sealing element 22 is attached to the second sealing element 6, the lower end of the third sealing element 23 is attached to the third sealing mechanism 7, and a press-fitting mechanism 9 is arranged between the upper end of the third sealing element 23 and the inner top of the third sealing element 8.

In this embodiment, after the first sealing mechanism 3 is first placed in the sealing groove 11, the valve stem 2 is inserted so that the first sealing member 21 and the first sealing mechanism 3 are fitted to each other, the first sealing member, the second sealing mechanism 5, the second sealing member 22, the second sealing member 6, and the third sealing mechanism 7 are sequentially fitted to the outside of the valve stem 2 and placed inside the sealing groove 11, the third sealing member 8 is attached to the end portion of the valve cap 1, and in the tightening process, the third sealing member 23 is urged by the press-fitting mechanism 9 so that the respective sealing mechanisms in the sealing groove 11 are closely attached to each other, and when the first sealing mechanism 3, the second sealing mechanism 5, and the third sealing mechanism 7 are sequentially damaged, according to the degree of tightening of the third sealing member 8, therefore, a sealing mechanism is always used for sealing the sealing groove 11, and the valve rod 2 is always kept in good sealing performance.

Further, the first sealing mechanism 3 includes a shaft sleeve 31 and a V-shaped sealing ring 32, the shaft sleeve 31 is sleeved on the outside of the valve rod 2 and located at the bottom of the sealing groove 11, one end of the V-shaped sealing ring 32 is attached to the top of the shaft sleeve 31, the other end of the V-shaped sealing ring 32 is attached to the bottom of the first sealing element 21, the number of the V-shaped sealing rings 32 is multiple, and the V-shaped sealing rings 32 are sequentially overlapped between the shaft sleeve 31 and the first sealing element 21.

In this embodiment, the bushing 31 is first placed at the bottom of the sealing groove 11, and then the V-shaped sealing rings 32 are placed above the bushing 31, so as to complete the installation of the first sealing mechanism 3, and the number of the V-shaped sealing rings 32 is multiple, so that the multiple-sealing and composite-sealing valve rod 2 has better sealing performance.

Further, the second sealing mechanism 5 includes a plurality of O-rings 51, the plurality of O-rings 51 are sequentially overlapped between the first sealing member 4 and the second sealing member 22, the third sealing mechanism 7 includes a plurality of graphite woven sealing rings 71, and the plurality of graphite woven sealing rings 71 are sequentially overlapped between the second sealing member 6 and the third sealing member 23.

In the present embodiment, the number of the O-rings 51 is plural, so that the sealing performance of the multiple composite sealing valve rod 2 against leakage is better, and the number of the graphite woven sealing rings 71 is plural, so that the sealing performance of the multiple composite sealing valve rod 2 against leakage is better.

Further, the first sealing element 21 and the second sealing element 22 both include a connecting ring 211, a first enclosing plate 212 and a first sealing ring 213, the connecting ring 211 of the first sealing element 21 is fixedly connected to the valve rod 2, the connecting ring 211 of the second sealing element 22 is slidably connected to the valve rod 2, each of the connecting rings 211 is provided with the first enclosing plate 212 on one side away from the valve rod 2, the first sealing ring 213 is provided on the inner wall of the first enclosing plate 212, the first tightening member 4 and the second tightening member 6 both include a cover plate 41 and a clamping plate 42, the clamping plate 42 is fixedly connected to the cover plate 41 and located below the cover plate 41, the cover plate 41 is adapted to the sealing groove 11, and the outer side of the clamping plate 42 is attached to the first sealing ring 213.

In this embodiment, when the connecting ring 211 is respectively attached to the V-shaped seal ring 32 and the O-shaped seal ring 51, the first sealing member 4 is pressed above the first sealing member 21, and the second sealing member 6 is pressed above the second sealing member 22, the outer wall of the catch plate 42 is attached to the first seal ring 213 on the inner wall of the first enclosing plate 212, so that the sealing performance of the multiple composite sealing stem 2 leakage prevention valve 2 is better.

Further, the press-fitting mechanism 9 includes a connecting column 91 and a pressing plate 92, one end of the connecting column 91 is welded to the inner top wall of the third sealing member 8, the other end of the connecting column 91 is welded to the pressing plate 92, a pressing groove 231 is formed in one end of the third sealing member 23, which is far away from the graphite woven sealing ring 71, and the pressing plate 92 is matched with the pressing groove 231.

In this embodiment, when the third tightening member 8 is tightened, the connection post 91 is moved downward, so that the pressing plate 92 slides on the pressing groove 231 and applies downward pressure to the third closing member 23, thereby pressing each sealing mechanism in the sealing groove 11.

Further, the bottom of the valve cover 1 and the connection between the end of the third tightening piece 8 and the valve rod 2 are both provided with dust rings 12.

In this embodiment, the dust ring 12 is used to isolate dust in the pipeline and in the atmosphere, so as to prevent the dust from entering the sealing groove 11 and affecting the sealing performance.

Referring to fig. 6, the present invention further provides a processing method of the multiple composite sealing valve rod 2 for preventing the leakage of the valve rod 2, which comprises the following steps:

s1: when the valve rod 2 is manufactured, the first closing piece 21 and the rod body of the valve rod 2 are manufactured by adopting an integral molding technology;

s2: after the shaft sleeve 31 is filled in the seal groove 11, the plurality of V-shaped seal rings 32 are sequentially placed in the seal groove 11 along the inner wall of the seal groove 11, and then the valve rod 2 is inserted, so that the first sealing member 21 is tightly attached to the uppermost V-shaped seal ring 32;

s3: sleeving the first tight fitting 4 on the valve rod 2, and sliding downwards along the inner wall of the sealing groove 11, so that the first tight fitting 4 is attached to the upper end of the first closing piece 21;

s4: sleeving a plurality of O-ring seals 51 on the valve rod 2, sliding the O-ring seals 51 into the sealing groove 11, so that the bottom O-ring seal 51 is attached to the first sealing member 4, and sleeving the second sealing member 22 on the valve rod 2, so that the top O-ring seal 51 is attached to the bottom of the second sealing member 22;

s5: sleeving the second tight fitting 6 on the valve rod 2, and sliding down along the inner wall of the sealing groove 11, so that the second tight fitting 6 is attached to the upper end of the second closing part 22;

s6: sleeving a plurality of graphite woven sealing rings 71 on the valve rod 2, sliding the graphite woven sealing rings 71 into the sealing groove 11, so that the graphite woven sealing ring 71 at the bottommost part is attached to the second tight part 6, and sleeving the third sealing part 23 on the valve rod 2, so that the graphite woven sealing ring 71 at the topmost part is attached to the bottom of the third sealing part 23;

s7: and screwing the third tightening piece 8 at the end part of the valve cover 1, so that the output end of the press-fitting mechanism 9 is attached to the third sealing piece.

In this embodiment, when the valve rod 2 is manufactured, the first sealing member 21 and the rod body of the valve rod 2 are manufactured by an integral molding technology, so that the connection structure between the valve rod 2 and the first sealing member 21 is firmer, after the shaft sleeve 31 is filled in the sealing groove 11, the plurality of V-shaped sealing rings 32 are sequentially placed in the sealing groove 11 along the inner wall of the sealing groove 11, and then the valve rod 2 is inserted, so that the first sealing member 21 is tightly attached to the uppermost V-shaped sealing ring 32, the first sealing member 4 is sleeved on the valve rod 2 and slides down along the inner wall of the sealing groove 11, so that the first sealing member 4 is attached to the upper end of the first sealing member 21, the plurality of O-shaped sealing rings 51 are sleeved on the valve rod 2 and slide into the sealing groove 11, so that the bottommost O-shaped sealing ring 51 is attached to the first sealing member 4, then, the second closing element 22 is sleeved on the valve rod 2, so that the uppermost O-ring seal 51 is attached to the bottom of the second closing element 22, the second closing element 6 is sleeved on the valve rod 2 and slides down along the inner wall of the sealing groove 11, so that the second closing element 6 is attached to the upper end of the second closing element 22, a plurality of graphite woven seal rings 71 are sleeved on the valve rod 2 and slide into the sealing groove 11, so that the bottommost graphite woven seal ring 71 is attached to the second closing element 6, then the third closing element 23 is sleeved on the valve rod 2, so that the uppermost graphite woven seal ring 71 is attached to the bottom of the third closing element 23, the third closing element 8 is screwed on the end of the valve cap 1, so that the output end of the press-fitting mechanism 9 is attached to the third closing element, therefore, when the first sealing mechanism 3, the second sealing mechanism 5 and the third sealing mechanism 7 are damaged in sequence, one sealing mechanism plays a sealing role on the sealing groove 11 all the time according to the screwing degree of the third tightening piece 8, so that the valve rod 2 always keeps good sealing performance.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.