CN117515181A

CN117515181A - Stop valve with two-stage valve rod

Info

Publication number: CN117515181A
Application number: CN202311689552.3A
Authority: CN
Inventors: 方超; 谢金武; 章芬辉; 丁昌斌; 陆凯
Original assignee: Anhui Fangxing Industrial Group Co ltd
Current assignee: Anhui Fangxing Industrial Group Co ltd
Priority date: 2023-12-11
Filing date: 2023-12-11
Publication date: 2024-02-06

Abstract

The invention relates to the technical field of valves, in particular to a stop valve with a two-section valve rod, which comprises a valve body and an upper valve seat arranged at the top of the valve body, wherein a valve port is arranged in the valve body, a valve clack is sequentially arranged above the valve port, and the valve clack is attached to the inner wall of the valve body and seals the valve port; the valve rod is connected to one end of the valve clack far away from the valve port; the second-section valve rod is rotationally connected to one end of the first-section valve rod, which is far away from the valve clack, and the second-section valve rod is rotationally connected to the upper valve seat; when the two-section valve rod rotates, the first-section valve rod can be driven to slide along the length track of the first-section valve rod. According to the invention, the traditional valve rod is divided into two sections which are rotationally connected with each other, so that one section of valve rod can slide reciprocally instead of rotating, and the sealing difficulty of the stop valve is reduced.

Description

Stop valve with two-stage valve rod

Technical Field

The invention relates to the technical field of valves, in particular to a stop valve with a two-section valve rod.

Background

The stop valve is an active valve, namely, the opening and the closing are manually operated, and the valve is mainly controlled to be opened and closed by driving the valve clack to move up and down by virtue of the lifting characteristic of the valve rod when the valve rod rotates through the threaded connection of the valve rod and the valve body.

For example, chinese patent application No. 202222249771.7, entitled "stop valve", relies on rotation of a valve stem to control up and down movement of a valve flap.

However, since the valve rod is rotated when being lifted, the difficulty of rotating and sealing is higher than that of sliding sealing when the shaft body is in dynamic sealing, and the possibility of medium leakage is higher in use as is well known.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a stop valve with a two-section valve rod, which comprises the following specific technical scheme:

stop valve with two segmentation valve stems, including the valve body and install in the last disk seat at valve body top, have a valve port in the valve body, the top of valve port has set gradually:

the valve clack is attached to the inner wall of the valve body and seals the valve port;

the valve rod is connected to one end of the valve clack far away from the valve port;

the second-section valve rod is rotationally connected to one end of the first-section valve rod, which is far away from the valve clack, and the second-section valve rod is rotationally connected to the upper valve seat;

when the two-section valve rod rotates, the first-section valve rod can be driven to slide along the length track of the first-section valve rod.

As a further technical scheme of the invention, the self-expansion valve further comprises a corrugated pipe with self-expansion characteristics, wherein the corrugated pipe is connected between the top of the valve clack and the inner wall of the valve body and sleeved outside the section of valve rod so as to seal a joint between the section of valve rod and the valve body.

As a further technical scheme of the invention, a cavity is formed at the top of the valve port, a section of valve rod penetrates through the cavity, a piston cavity is formed at the bottom of the upper valve seat, the piston cavity is inserted into the cavity and matched with a section of valve rod to form a sealing cavity, a liquid sealing ring is arranged in the sealing cavity to divide the sealing cavity into two groups of filling cavities which are not communicated with each other, and elastic filler is filled in the filling cavities.

As a further technical scheme of the invention, one side of the filling cavity, which is far away from a section of valve rod, is provided with a reserved groove, and a first O-shaped ring is arranged in the reserved groove.

As a further technical scheme of the invention, a piston cavity is arranged in the upper valve seat, the top of a section of valve rod is inserted into the piston cavity, one end of the section of valve rod inserted into the piston cavity is connected with a piston, two groups of first annular grooves are arranged on the outer side wall of the piston at intervals along the axial direction, a spacer ring is sleeved in the first annular grooves, a second annular groove is arranged between the two groups of first annular grooves, and a third O-shaped ring and a sealing ring are sequentially sleeved in the second annular grooves from inside to outside.

As a further technical scheme of the invention, a step groove is formed in the top of the valve body, a gasket and a second O-shaped ring are sequentially arranged in the step groove from outside to inside, and when the valve body is attached to the upper valve seat, the gasket and the second O-shaped ring are transversely deformed under stress.

As a further technical scheme of the invention, the valve further comprises a screwing bolt, wherein the screwing bolt penetrates through the upper valve seat and is in rotary connection with the valve body, and the screwing bolt is driven to rotate by an external force and adjusts the distance between the valve body and the upper valve seat.

As a further technical scheme of the invention, the bottom of the valve clack is of a conical structure.

The beneficial effects of the invention are as follows:

(1) In this application, through divide into traditional valve rod two segmentation that rotate each other and connect, can make one section valve rod reciprocating sliding, rather than rotatory to reduce the sealed degree of difficulty of stop valve.

(2) In this application, set up the bellows that can stretch out and draw back certainly, but the seam of shutoff one section valve rod and valve body forms the first sealed line of defense when one section valve rod moves to guarantee the sealed effect of one section valve rod slip in-process.

(3) In this application, pack the elastic filler in the filling chamber that two intervals set up to make the filler take place radial deformation in order to hug closely one section valve rod outer wall, with this second way line of defense that forms one section valve rod motion time, and set up first O type circle in one side of filler and overcome filler volume loss problem, extension filler seal's life.

(4) In this application, utilize the elastic deformation extrusion sealing ring laminating piston chamber inner wall of third O type circle, form the sliding seal protection between piston and the piston chamber, form the third line of defense to stop valve seal, cooperate foretell first, the second line of defense, form the sealing protection to the piston motion in-process, avoid the medium leakage.

Drawings

FIG. 1 shows a schematic cross-sectional view of a shut-off valve having a two-piece valve stem;

FIG. 2 shows a schematic perspective view of a shut-off valve having a two-piece valve stem;

FIG. 3 shows a schematic cross-sectional view of a shut-off valve having a two-piece valve stem;

FIG. 4 shows an enlarged schematic view of the structure at A in FIG. 3;

fig. 5 shows a schematic structural diagram of the piston.

Description of the drawings: 100. a valve body; 110. a valve port; 120. a valve flap; 130. a length of valve stem; 140. a bellows; 150. a cavity; 151. sealing the cavity; 152. a liquid sealing ring; 153. filling the cavity; 154. a reserved groove; 155. a first O-ring; 160. a step groove; 161. a gasket; 162. a second O-ring; 170. screwing the bolt; 200. an upper valve seat; 210. a two-stage valve stem; 220. a piston chamber; 230. a piston; 231. a first ring groove; 232. a spacer ring; 233. a second ring groove; 234. a third O-ring; 235. and (3) a sealing ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments.

In view of the above technical problems, the present application provides a stop valve with a two-stage valve stem, and fig. 1 shows a schematic cross-sectional structure of the stop valve with a two-stage valve stem; in fig. 1, the stop valve with two-stage valve rod includes a valve body 100 and an upper valve seat 200 installed on the top of the valve body 100, a valve port 110 is provided in the valve body 100, and the upper part of the valve port 110 is provided with:

a valve clack 120 attached to the inner wall of the valve body 100 and sealing the valve port 110;

a valve stem 130 connected to an end of the valve flap 120 remote from the valve port 110;

the second-stage valve rod 210 is rotatably connected to one end of the first-stage valve rod 130 far away from the valve clack 120, and the second-stage valve rod 210 is in threaded connection with the upper valve seat 200;

the rotation of the two-stage valve stem 210 drives the one-stage valve stem 130 to slide along its length.

In the use, manual drive two sections valve rod 210 are rotatory, through two sections valve rod 210 and last disk seat 200 threaded connection, can make two sections valve rod 210 reciprocate in rotatory, because two sections valve rod 210 rotate with one section valve rod 130 and be connected, one section valve rod 130 is along with two sections valve rod 210 synchronous lift but not rotatory this moment to realize the slip on the length orbit, in this application, through divide into traditional valve rod two segmentation that rotate each other and connect, can make one section valve rod 130 do reciprocating slip, and not rotate, thereby reduce the sealed degree of difficulty of stop valve.

FIG. 3 shows a schematic cross-sectional view of a shut-off valve having a two-piece valve stem; in fig. 3, the shut-off valve with a two-piece valve stem further comprises:

the bellows 140 with self-expansion characteristic, the bellows 140 is connected between the top of the valve clack 120 and the inner wall of the valve body 100 and sleeved outside the section of valve rod 130, and is used for sealing the joint between the section of valve rod 130 and the valve body 100.

In use, as the valve clack 120 is lifted and lowered, the bellows 140 stretches or compresses to form a seal for connecting the valve rod 130 with the valve body 100, and a first seal line is formed when the valve rod 130 moves, so as to ensure the sealing effect in the sliding process of the valve rod 130.

Referring to fig. 3, the bottom of the valve flap 120 is tapered.

In use, the plug can be inserted into the valve port 110 to form tangential contact with the end surface of the valve port, so that the plugging effect is better.

It should be noted that, the bellows 140 is made of elastic steel, and can effectively isolate the corrosive medium.

FIG. 4 shows an enlarged schematic view of the structure at A in FIG. 3; in fig. 1 and 4, a cavity 150 is formed at the top of the valve port 110, a section of valve rod 130 penetrates through the cavity 150, a piston cavity 220 is formed at the bottom of the upper valve seat 200, the piston cavity 220 is inserted into the cavity 150 and cooperates with a section of valve rod 130 to form a sealing cavity 151, a liquid sealing ring 152 is arranged in the sealing cavity 151 to divide the sealing cavity into two groups of filling cavities 153 which are not communicated with each other, and elastic filler is filled in the filling cavities 153.

In use, the packing is subjected to the axial extrusion force of the piston cavity 220, radial deformation can be generated to cling to the outer wall of the section of valve rod 130, two filling cavities 153 arranged at intervals can form two sealing lines on the surface of the section of valve rod 130, so that a second line of defense is formed when the section of valve rod 130 moves, the sealing effect of the stop valve is enhanced, and the corrugated pipe 140 is isolated from a medium, so that the phenomena that the traditional packing is corroded and worn by the pressure of the medium can be effectively avoided, and the service life of the packing structure is indirectly prolonged.

During installation, a set of packing is filled in advance into the sealing cavity 151, the sealing ring 152 is placed in the sealing cavity, then a set of packing is filled in the sealing cavity, and finally the sealing ring is inserted into the piston cavity 220 to axially squeeze the sealing ring, so that two sets of sealing lines which are arranged at intervals are formed.

It should be noted that the specific material of the filler can rotate according to different conveying media, and is not limited in any way, for example, corrosive media are conveyed, and a filler felt is selected at this time, and is made of fiber materials such as wool, and has the advantages of good elasticity, good sealing performance, high temperature resistance and the like, and is suitable for high-temperature, high-pressure and strong-corrosion media.

The filler is affected by thermal expansion and contraction to generate thermal deformation, the volume is expanded, and secondary shaping is performed after cooling, so that the volume loss is generated, and the sealing effect is affected.

With reference to fig. 4, a reserved groove 154 is formed on a side of the filling cavity 153 away from the valve rod 130, and a first O-ring 155 is disposed in the reserved groove 154.

In this application, through set up a reservation groove 154 in one side that does not directly contact with the medium, reservation groove 154 can initiatively hold the filler of inflation this moment, and the deformation takes place for the first O type circle 155 in the reservation groove 154 simultaneously, because first O type circle 155 does not directly contact with the medium, its elasticity does not take place the influence, can recover and push the filler back into in filling cavity 153 with filler volume loss problem in this after the cooling to the life of extension filler seal.

Fig. 5 shows a schematic structural view of the piston 230; in fig. 3 and 5, a piston cavity 220 is formed in the upper valve seat 200, a section of valve rod 130 is inserted into the piston cavity 220, one end of the section of valve rod 130 inserted into the piston cavity 220 is connected with a piston 230, two groups of first annular grooves 231 are axially spaced apart from each other on the outer side wall of the piston 230, a spacer ring 232 is sleeved in the first annular grooves 231, a second annular groove 233 is formed between the two groups of first annular grooves 231, and a third O-shaped ring 234 and a sealing ring 235 are sequentially sleeved in the second annular groove 233 from inside to outside.

In use, the piston 230 slides in the piston cavity 220 along with the piston 230, at this time, the spacer 232 is attached to the inner wall of the piston cavity 220 to prevent the piston 230 from generating rigid friction with the piston cavity 220, and the third O-ring 234 is deformed in the second annular groove 233 by elastic extrusion of the sealing ring 235, and the elastic deformation of the third O-ring 234 is utilized to extrude the sealing ring 235 to attach to the inner wall of the piston cavity 220, so as to form a third line of defense for sealing the stop valve, and the first line of defense and the second line of defense are matched to form seal protection for the piston 230 in the moving process, thereby avoiding medium leakage.

It should be noted that, the spacer 232 is polyurethane, the sealing ring 235 is nitrile rubber, and in some other embodiments, specific choices may be made according to different conveying media, which will not be described herein in detail.

With continued reference to fig. 1 and 3, a step groove 160 is formed at the top of the valve body 100, and a gasket 161 and a second O-ring 162 are sequentially disposed in the step groove 160 from outside to inside, and when the valve body 100 is attached to the upper valve seat 200, the gasket 161 and the second O-ring 162 are both deformed by transverse stress.

In use, the thicknesses of the selected gasket 161 and the second O-shaped ring 162 on the vertical surfaces are larger than the depth of the step groove 160, and when the upper valve seat 200 and the valve body 100 are installed, the gasket 161 and the second O-shaped ring 162 are transversely stressed and deformed, so that the installation gap between the valve body 100 and the upper valve seat 200 is sealed, and the sealing effect is ensured.

The gasket 161 is made of copper.

FIG. 2 shows a schematic perspective view of a shut-off valve having a two-piece valve stem; in fig. 2, the shut-off valve with a two-stage valve stem further includes a screw bolt 170, the screw bolt 170 penetrates the upper valve seat 200 and is screwed with the valve body 100, and the screw bolt 170 is driven to rotate by an external force and adjusts the distance between the valve body 100 and the upper valve seat 200.

In use, the screwing bolt 170 penetrates through the upper valve seat 200 to be connected with the valve body 100, the screwing bolt 170 is rotated to move up and down, and the distance between the valve body 100 and the upper valve seat 200 can be adjusted, so that the extrusion effect of the side surface adjusting gasket 161 and the second O-shaped ring 162 and the extrusion force of the piston cavity 220 on the packing are improved, and the applicability of the device is improved.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting.

Claims

1. Stop valve with two segmentation valve stems, including valve body (100) and install in last disk seat (200) at valve body (100) top, have a valve port (110) in valve body (100), its characterized in that, the top of valve port (110) has set gradually:

the valve clack (120) is attached to the inner wall of the valve body (100) and seals the valve port (110);

a section of valve rod (130) connected to one end of the valve clack (120) far away from the valve port (110);

the second-section valve rod (210) is rotationally connected to one end, far away from the valve clack (120), of the first-section valve rod (130), and the second-section valve rod (210) is rotationally connected to the upper valve seat (200);

the two-stage valve rod (210) can drive the one-stage valve rod (130) to slide along the length track of the one-stage valve rod when rotating.

2. The shut-off valve with a two-stage valve stem according to claim 1, further comprising a bellows (140) having a self-telescoping property, wherein the bellows (140) is connected between the top of the valve flap (120) and the inner wall of the valve body (100) and is sleeved outside the one-stage valve stem (130) to seal a seam between the one-stage valve stem (130) and the valve body (100).

3. The shut-off valve having a two-piece valve stem of claim 2, wherein: a cavity (150) is formed in the top of the valve port (110), a section of valve rod (130) penetrates through the cavity (150), a piston cavity (220) is formed in the bottom of the upper valve seat (200), the piston cavity (220) is inserted into the cavity (150) and matched with a section of valve rod (130) to form a sealing cavity (151), a liquid sealing ring (152) is arranged in the sealing cavity (151) to divide the sealing cavity into two groups of filling cavities (153) which are not communicated with each other, and elastic filler is filled in the filling cavities (153).

4. A shut-off valve having a two-piece valve stem as defined in claim 3, wherein: one side of the filling cavity (153) far away from the section of valve rod (130) is provided with a reserved groove (154), and the reserved groove (154) is internally provided with a first O-shaped ring (155).

5. The stop valve with the two-stage valve rod according to claim 4, wherein a piston cavity (220) is formed in the upper valve seat (200), the top of the one-stage valve rod (130) is inserted into the piston cavity (220), one end of the one-stage valve rod (130) inserted into the piston cavity (220) is connected with a piston (230), two groups of first annular grooves (231) are formed in the outer side wall of the piston (230) at intervals along the axial direction, a spacer ring (232) is sleeved in the first annular grooves (231), a second annular groove (233) is formed between the two groups of first annular grooves (231), and a third O-shaped ring (234) and a sealing ring (235) are sequentially sleeved in the second annular groove (233) from inside to outside.

6. The stop valve with the two-stage valve rod according to claim 5, wherein a step groove (160) is formed in the top of the valve body (100), a gasket (161) and a second O-ring (162) are sequentially arranged in the step groove (160) from outside to inside, and when the valve body (100) is attached to the upper valve seat (200), the gasket (161) and the second O-ring (162) are transversely deformed under stress.

7. The shut-off valve with a two-stage valve stem according to claim 5, further comprising a screw bolt (170), the screw bolt (170) penetrating the upper valve seat (200) and being rotatably connected to the valve body (100), the screw bolt (170) being driven to rotate by an external force and adjusting a distance between the valve body (100) and the upper valve seat (200).

8. The shut-off valve with a two-piece valve stem of claim 1, wherein the bottom of the valve flap (120) is of a conical configuration.