CN220268487U

CN220268487U - Bellows track ball valve

Info

Publication number: CN220268487U
Application number: CN202321384023.8U
Authority: CN
Inventors: 李帅举; 周小强
Original assignee: Zhejiang Yongsheng Technology Co ltd
Current assignee: Zhejiang Yongsheng Technology Co ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-12-29
Anticipated expiration: 2033-06-01

Abstract

The utility model discloses a corrugated pipe track ball valve which comprises a valve body, a valve seat, a valve core, a lower valve rod, an upper valve rod, a valve cover, a guide pin and a corrugated pipe assembly, wherein the valve body is provided with a valve seat; the valve seat is fixed in the valve body, the valve core is arranged in the valve body and is close to the valve seat, the valve cover is fixed with the valve body, the lower end of the lower valve rod penetrates through the valve cover and can slide and rotate relative to the valve cover, the valve core is connected with the lower end of the lower valve rod, a guide chute is arranged on the outer side wall of the lower valve rod, the guide pin is fixed on the valve cover, one end of the guide pin is arranged in the guide chute and is matched with the guide chute, the upper end of the lower valve rod is rotationally connected with the upper valve rod, and the corrugated pipe assembly is sleeved outside the upper valve rod. The utility model provides a corrugated pipe track ball valve which can solve the problem of filler leakage in the later period of valve operation.

Description

Bellows track ball valve

Technical Field

The utility model relates to the technical field of track ball valves, in particular to a corrugated pipe track ball valve.

Background

Track ball valves (forced seal ball valves) conventionally seen in the market all adopt a single valve seat structure. The valve sealing effect is achieved by the forced extrusion force when the valve rod is closed. The track ball valve is applied to some inflammable and explosive, high-corrosiveness and high-temperature working conditions, and the most worn part is the most easily leaking part as the packing seal is the most worn part along with the extension of the valve operation time in the secondary working conditions. This can cause certain potential safety hazards to the safety of chemical enterprises. Therefore, whether a track ball valve with higher reliability and better sealing performance can be invented or not to solve the problem of filler leakage in the later operation period of the valve.

Common track ball valves on the market are basically divided into two types: the valve rod is characterized in that a track groove is formed in the middle section of the valve rod, the valve rod can be controlled to rotate in the track groove along with lifting and descending of the valve rod when the valve is in operation, and then the spherical surface and the sealing surface of the valve seat are tightly attached to or detached from each other under the control of the inclined surface of the lower part of the valve rod. The valve is characterized in that a straight rod is arranged in the middle section of the valve rod, a spiral flat square is arranged at the lower part of the valve rod, the valve is lifted and lowered along with the valve rod when in operation, the spiral flat square control sphere at the lower part of the valve rod rotates by 90 degrees firstly, and then the spherical surface and the sealing surface of the valve seat are tightly attached or detached by utilizing the inclined plane control at the lower part of the valve rod.

In the valve with the two structures, the valve rod of the valve with the first structure is positioned on a rotating, lifting and tilting movement track. In the second structure, the valve rod is in a lifting and tilting movement track along with the opening and closing of the valve. Therefore, both of these situations occur where the valve stem packing leaks due to wear after a period of use. Therefore, the utility model can well solve the problems, firstly, the valve rod is designed to be of a split structure, and the upper valve rod of the filler treatment part only moves up and down, so that the characteristic that the corrugated pipe can only be stretched and compressed but cannot be twisted can be met. Secondly, the lower valve rod is in a closed state, and the ball body and the valve rod inclined plane belong to mechanical forced sealing. The sealing of the upper valve rod is not affected when the lower valve rod is inclined. Thereby solving the problem of filler leakage.

When the situation is met in the market at present, for the first structural valve, double-layer packing or packing with better performance can be adopted. However, as the valve service life is prolonged, the degree of wear of the packing becomes more and more severe, and the possibility of leakage is also provided. For the valve with the second structure, although the valve rod only performs ascending and descending operation, when the valve rod is finally sealed with the ball body, the lower end surface of the valve rod and the ball body are decomposed through pushing force pushing down the valve rod, so that the ball body and the sealing surface of the valve seat are forced to be extruded for sealing. At this time, the valve rod is reversely deformed under the reaction force of the ball body, and the valve rod can incline, and the valve rod has an influence on the packing seal and the corrugated pipe seal. The track ball valve with the two structures has the defects that: 1. the packing is worn more and more seriously with the lengthening of the valve operation period, and the possibility of leakage can occur. 2. When the valve is closed, the valve rod can incline under the action of reaction force. Even if the bottom of the valve stem is tilted by a fraction of a degree, the entire valve stem is longer, often with several millimeters of deflection extending to the top of the valve stem. The damage to the valve stem packing is exacerbated by the imbalance in packing forces. 3. Even if the bellows is provided in such a structure, the stem may be inclined, resulting in lateral stretching of the bellows. Such deformation is also the most fatal of the bellows, to greatly reduce the life span of the bellows.

Chinese patent application publication No. CN113719633a, publication No. 2017, 15, entitled "a bellows track ball valve", discloses a bellows track ball valve, including valve rod, valve gap, disk seat, spheroid, be equipped with the bellows between valve rod and the valve gap, the outside of bellows is equipped with the valve gap nut, through vice cooperation of screw thread between valve gap nut and the valve gap, the lower part of valve rod is equipped with the location shoulder with bellows welded, be equipped with the guide pin on the valve gap, be equipped with on the valve rod with the guide rail groove of guide pin mutually supporting, the guide rail groove is the straight line shape, spheroidal upper portion is equipped with 90 spiral slotted holes, the lower extreme of valve rod is equipped with 90 spiral guide rail mutually supporting with 90 spiral slotted holes, 90 spiral guide rail axis and valve rod axis are equipped with eccentric mass, spheroidal up end is equipped with annular groove, the annular groove is embedded to have thrust collar. But the track ball valve still does not solve the above problems.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides the corrugated pipe track ball valve which can solve the problem of filler leakage in the later period of valve operation.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a bellows track ball valve comprises a valve body, a valve seat, a valve core, a lower valve rod, an upper valve rod, a valve cover, a guide pin and a bellows assembly; the valve seat is fixed in the valve body, the valve core is arranged in the valve body and is close to the valve seat, the valve cover is fixed with the valve body, the lower end of the lower valve rod penetrates through the valve cover and can slide and rotate relative to the valve cover, the valve core is connected with the lower end of the lower valve rod, a guide chute is arranged on the outer side wall of the lower valve rod, the guide pin is fixed on the valve cover, one end of the guide pin is arranged in the guide chute and is matched with the guide chute, the upper end of the lower valve rod is rotationally connected with the upper valve rod, and the corrugated pipe assembly is sleeved outside the upper valve rod.

The technical scheme is that the valve rod split structure is adopted, and the lower valve rod can rotate by 90 degrees and ascend/descend under the action of the guide pin under the driving of the upper valve rod. Because the lower valve rod and the valve cover have a certain clearance due to the fit tolerance, the inclined surface at the lower end of the valve rod interacts with the valve core in a closed state, so that the lower valve rod can incline, but the connection between the lower valve rod and the valve rod assembly belongs to open connection. The bellows in the upper valve stem and valve stem assembly is not affected, thereby ensuring that the bellows is only subjected to vertical stretching and compression. The upper valve rod and the corrugated pipe in the corrugated pipe assembly can only perform ascending and descending operation. The leakage caused by the damage of the corrugated pipe due to the torsion and the inclined deformation of the corrugated pipe is effectively prevented. Finally, the valve is ensured to run for a long period without leakage of valve rod packing.

Preferably, the upper end of the lower valve rod is provided with a T-shaped groove, the lower end of the upper valve rod is provided with a connecting part connected with the T-shaped groove, and the lower end face of the connecting part is spherical and is contacted with the bottom surface of the T-shaped groove. The upper valve rod and the corrugated pipe can only move up and down axially. The lower extreme of connecting portion has set up spherical surface, and this spherical surface can be automatic according to the position automatic alignment contact point transmission thrust of lower valve rod when upper valve rod descends to the mating surface has set up the clearance. And when the lower valve rod moves, the condition of blocking when tilting is avoided during double-plane contact.

Preferably, a thrust ball plane bearing is arranged between the upper end face of the connecting part and the lower valve rod.

Preferably, the bellows assembly comprises a bellows body, a sleeve, a supporting ring and an anti-rotation pin, the sleeve is fixed on the valve cover, the bellows body is arranged in the sleeve, the bellows body is sleeved outside the upper valve rod, the upper end of the bellows body is fixed with the sleeve, the lower end of the bellows body is fixed with the upper valve rod, the supporting ring is fixed with the upper end of the sleeve, the anti-rotation pin is fixed with the supporting ring, a guide straight groove with an axis arranged is formed in the outer side wall of the upper valve rod, and one end of the anti-rotation pin is arranged in the guide straight groove and is matched with the guide straight groove. The upper valve rod and the corrugated pipe can only perform ascending and descending operation, so that leakage caused by corrugated pipe damage due to torsion and inclined deformation of the corrugated pipe is effectively prevented.

Preferably, the valve further comprises an upper cover, the upper cover is sleeved outside the bellows assembly, the lower end of the upper cover is fixed with the valve cover and compresses the sleeve, the upper end of the upper cover is provided with a pressing plate, and the upper valve rod is in sliding connection with the pressing plate.

Preferably, the valve further comprises a guide sleeve, wherein the guide sleeve is fixed in the valve cover, and the lower end of the lower valve rod is slidably and rotatably connected with the valve cover through the guide sleeve.

Preferably, a guide bearing is arranged on the side surface of the lower part of the lower valve rod, and an inclined groove surface for being matched with the guide bearing is arranged in the valve core. The side of lower valve rod sets up the cylindric lock that has the flange, and guide bearing is the roll axle sleeve of setting at cylindric lock excircle, and when lower valve rod moved down under the promotion of bellows subassembly, guide bearing can extrude the inclined groove face of case, makes the case take place the slope, ensures case and valve seat sealing surface seal.

Preferably, the number of the guide pins is two, and the two guide pins are symmetrically arranged on two sides of the lower valve rod.

Preferably, the valve core is provided with a wedge-pressing spherical surface, and when the wedge-pressing spherical surface is aligned with the valve seat, the wedge-pressing spherical surface presses the valve seat. Valve closing process: 1. the valve rod is at the highest position, the ball body is at the open position, and the center line of the ball body channel and the valve flow channel is parallel. Under the action of the actuator, the valve stem begins to descend and the ball begins to rotate. 2. The actuating mechanism continues to operate, and the lower valve rod is matched with the spiral groove of the valve cover through the guide pin, so that the valve rod and the ball body simultaneously start to rotate by 90 degrees. 3. The actuator continues to operate, causing the lower stem and ball to continue to rotate to 90 degrees. The ball rotates without friction with the valve seat during closing. 4. The last part of the execution structure is formed to drive the two plane forced wedge pressing balls at the bottom of the lower valve rod to tightly press the wedge pressing balls on the valve seat. Ensuring a seal between the ball and the valve seat.

Preferably, the lower end of the valve core is rotatably connected with the valve body. The structure can increase the stability of the valve core.

Preferably, the valve cover is provided with a sealing cover, the guide pin penetrates through the valve cover to provide sealing of the sealing cover, and the sealing cover is fixed with the valve cover through bolts. The structure can facilitate lubrication through the position of the sealing cover, and the guide pin is convenient to install.

The beneficial effects of the utility model are as follows: (1) The lower valve rod is connected with the valve rod assembly in an open mode, bellows in the valve rod assembly cannot be influenced, accordingly, the bellows is guaranteed to only bear vertical stretching and compression, leakage caused by damage of the bellows due to torsion and inclined deformation of the bellows is effectively prevented, and finally leakage of valve rod packing cannot occur during long-period operation of the valve. (2) The lower extreme of connecting portion has set up spherical surface, and this sphere can be automatically according to the position automatic alignment contact point transmission thrust of lower valve rod when valve rod assembly descends to the mating surface has set up the clearance, when avoiding biplane contact, appears the condition of holding down when inclining when lower valve rod moves.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic structural view of a bellows assembly;

FIG. 3 is a schematic view of a partial construction of the junction of the lower stem and the upper stem;

fig. 4 is a schematic view of the structure of the lower valve rod and the valve core.

In the figure: the valve comprises a valve body 1, a valve seat 2, a valve core 3, a wedge pressing spherical surface 3.1, a lower valve rod 4, a guide chute 4.1, a T-shaped groove 4.2, an upper valve rod 5, a connecting part 5.1, a valve cover 6, a guide pin 7, a corrugated pipe assembly 8, a corrugated pipe body 8.1, a sleeve pipe 8.2, a support ring 8.3, an anti-rotation pin 8.4, a thrust ball plane bearing 9, an upper cover 10, a pressing plate 11, a guide sleeve 12, a sealing cover 13, a guide bearing 14 and an inclined groove surface 15.

Detailed Description

The utility model is further described below with reference to the drawings and specific embodiments.

Example 1:

as shown in fig. 1 to 4, a bellows track ball valve comprises a valve body 1, a valve seat 2, a valve core 3, a lower valve rod 4, an upper valve rod 5, a valve cover 6, a guide pin 7, a bellows assembly 8, an upper cover 10 and a guide sleeve 12. The valve seat 2 is fixed in the valve body 1, the valve core 3 is arranged in the valve body 1 and is close to the valve seat 2, the valve cover 6 is fixed with the valve body 1, the guide sleeve 12 is fixed in the valve cover 6, the lower end of the lower valve rod 4 passes through the guide sleeve 12 and is in sliding and rotating connection with the valve cover 6 through the guide sleeve 12, the valve core 3 is connected with the lower end of the lower valve rod 4, the valve core 3 is provided with a wedge pressing spherical surface 3.1, and when the wedge pressing spherical surface 3.1 is aligned with the valve seat 2, the wedge pressing spherical surface 3.1 presses the valve seat 2, and the lower end of the valve core 3 is in rotating connection with the valve body 1. The outer side wall of the lower valve rod 4 is provided with guide chute 4.1, guide pins 7 are fixed on the valve cover 6, one ends of the guide pins 7 are arranged in the guide chute 4.1 and are matched with the guide chute 4.1, the number of the guide pins 7 is two, and the two guide pins 7 are symmetrically arranged on two sides of the lower valve rod 4. As shown in fig. 3, the upper end of the valve rod 4 is provided with a T-shaped groove 4.2, the lower end of the upper valve rod 5 is provided with a connecting part 5.1 connected with the T-shaped groove 4.2, and the lower end surface of the connecting part 5.1 is spherical and contacts with the bottom surface of the T-shaped groove 4.2. A thrust ball plane bearing 9 is arranged between the upper end surface of the connecting part 5.1 and the lower valve rod 4. A guide bearing 14 is arranged on one side of the lower part of the lower valve rod 4, and an inclined groove surface 15 for matching with the guide bearing 14 is arranged in the valve core 3. The cylindrical pin with the flange is fixedly arranged on the side face of the lower valve rod 4, the guide bearing 14 is a rolling shaft sleeve arranged on the outer circle of the cylindrical pin, the lower valve rod 4 moves downwards under the pushing of the bellows component 8, and when the lower valve rod 4 descends, the guide bearing 14 can press the inclined groove face 15 of the valve core 3, so that the valve core 3 inclines, and the sealing of the valve core and the sealing face of the valve seat is ensured.

As shown in fig. 2, the bellows assembly 8 includes a bellows body 8.1, a sleeve pipe 8.2, a support ring 8.3 and an anti-rotation pin 8.4, the sleeve pipe 8.2 is fixed on the valve cover 6, the bellows body 8.1 is arranged in the sleeve pipe 8.2, the bellows body 8.1 is sleeved outside the upper valve rod 5, the upper end of the bellows body 8.1 is fixed with the sleeve pipe 8.2, the lower end of the bellows body 8.1 is fixed with the upper valve rod 5, the support ring 8.3 is fixed with the upper end of the sleeve pipe 8.2, the anti-rotation pin 8.4 is fixed with the support ring 8.3, a guide straight groove with an axis arranged on the outer side wall of the upper valve rod 5, and one end of the anti-rotation pin 8.4 is arranged in the guide straight groove and is adapted to the guide straight groove. The cover of upper cover 10 is established in bellows subassembly 8 outside, and the lower extreme of upper cover 10 is fixed and compresses tightly sleeve pipe 8.2 with valve gap 6, and the upper end of upper cover 10 is equipped with clamp plate 11, upper valve rod 5 and clamp plate 11 sliding connection. The valve cover 6 is provided with a sealing cover 13, the guide pin 7 passes through the valve cover 6 to provide sealing of the sealing cover 13, and the sealing cover 13 is fixed with the valve cover 6 through bolts.

The technical scheme adopts a valve rod split structure, and under the drive of the upper valve rod 5, the lower valve rod 4 can rotate by 90 degrees and ascend/descend under the action of the guide pin 7. Since the lower stem 4 and the valve cap 6 have a certain clearance for the fit tolerance, the interaction between the inclined surface at the lower end of the stem and the closed state of the valve core 3 will cause the lower stem 4 to incline, but the connection between the lower stem 4 and the stem assembly is an open connection. The bellows in the upper valve stem 5 and the valve stem assembly are thus not affected, ensuring that the bellows is only subjected to vertical stretching and compression. The upper valve stem 5 and bellows in the bellows assembly 8 can only be operated up and down. The leakage caused by the damage of the corrugated pipe due to the torsion and the inclined deformation of the corrugated pipe is effectively prevented. Finally, the valve is ensured to run for a long period without leakage of valve rod packing.

The beneficial effects of the utility model are as follows: (1) The lower valve rod 4 is connected with the valve rod assembly in an open mode, bellows in the valve rod assembly cannot be influenced, accordingly, the bellows is guaranteed to only bear vertical stretching and compression, leakage caused by damage of the bellows due to torsion and inclined deformation of the bellows is effectively prevented, and finally leakage of valve rod packing cannot occur during long-period operation of the valve. (2) The lower extreme of connecting portion 5.1 has set up spherical, and this sphere can be automatic according to the position automatic alignment contact point transmission thrust of lower valve rod 4 when valve rod assembly descends to the mating surface has set up the clearance, when avoiding biplane contact, the condition that is suffocated when the lower valve rod 4 moves when appearing the slope.

Claims

1. The corrugated pipe track ball valve is characterized by comprising a valve body, a valve seat, a valve core, a lower valve rod, an upper valve rod, a valve cover, a guide pin and a corrugated pipe assembly; the valve seat is fixed in the valve body, the valve core is arranged in the valve body and is close to the valve seat, the valve cover is fixed with the valve body, the lower end of the lower valve rod penetrates through the valve cover and can slide and rotate relative to the valve cover, the valve core is connected with the lower end of the lower valve rod, a guide chute is arranged on the outer side wall of the lower valve rod, the guide pin is fixed on the valve cover, one end of the guide pin is arranged in the guide chute and is matched with the guide chute, the upper end of the lower valve rod is rotationally connected with the upper valve rod, and the corrugated pipe assembly is sleeved outside the upper valve rod.

2. The bellows track ball valve of claim 1, wherein the upper end of the lower valve rod is provided with a T-shaped groove, the lower end of the upper valve rod is provided with a connecting part connected with the T-shaped groove, and the lower end face of the connecting part is spherical and contacts with the bottom surface of the T-shaped groove.

3. The bellows track ball valve of claim 2, wherein a thrust ball plane bearing is provided between the upper end surface of the connecting portion and the lower valve stem.

4. A bellows track ball valve according to claim 1, 2 or 3, wherein the bellows assembly comprises a bellows body, a sleeve, a support ring and an anti-rotation pin, the sleeve is fixed on the valve cover, the bellows body is arranged in the sleeve, the bellows body is sleeved outside the upper valve rod, the upper end of the bellows body is fixed with the sleeve, the lower end of the bellows body is fixed with the upper valve rod, the support ring is fixed with the upper end of the sleeve, the anti-rotation pin is fixed with the support ring, a guide straight groove with an axis is arranged on the outer side wall of the upper valve rod, and one end of the anti-rotation pin is arranged in the guide straight groove and is matched with the guide straight groove.

5. The bellows track ball valve of claim 4, further comprising an upper cover, wherein the upper cover is sleeved outside the bellows assembly, the lower end of the upper cover is fixed with the valve cover and compresses the sleeve, the upper end of the upper cover is provided with a pressing plate, and the upper valve rod is in sliding connection with the pressing plate.

6. A bellows track ball valve as claimed in claim 1, 2 or 3, further comprising a guide sleeve secured within the valve cap, the lower end of the lower valve stem being slidably and rotatably coupled to the valve cap by the guide sleeve.

7. A bellows track ball valve according to claim 1, 2 or 3, wherein the lower side of the lower valve rod is provided with a guide bearing, and the valve core is internally provided with an inclined groove surface for matching with the guide bearing.

8. A bellows track ball valve as claimed in claim 1, 2 or 3 wherein the valve element is provided with a wedge ball surface which compresses the valve seat when aligned with the valve seat.

9. A bellows track ball valve as claimed in claim 1, 2 or 3 wherein the lower end of the valve element is rotatably connected to the valve body.

10. A bellows track ball valve as claimed in claim 1, 2 or 3 wherein the valve cap is provided with a sealing cap and the guide pin passes through the valve cap to provide sealing of the sealing cap, the sealing cap being secured to the valve cap by a bolt.