CN218236153U

CN218236153U - Stop valve

Info

Publication number: CN218236153U
Application number: CN202221343648.5U
Authority: CN
Inventors: 张伟鹏; 罗学武; 邹帅超; 吴淑民; 陈海涛
Original assignee: Shanghai Figure Cryogenic Valves Co ltd
Current assignee: Shanghai Figure Cryogenic Valves Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2023-01-06
Anticipated expiration: 2032-05-19

Abstract

The utility model relates to the technical field of valves. The stop valve comprises a valve body, a valve cover, a valve seat, a valve clack and a driving mechanism for driving the valve clack to move, wherein an inlet flow passage and an outlet flow passage are formed in the valve body, a return spring is clamped between the valve clack and the valve body, and the return spring is positioned on one side, far away from the driving mechanism, of the valve clack. The driving mechanism comprises a transmission rod and a power source for driving the transmission rod to move longitudinally, and the transmission rod is in transmission connection with the power source; the transmission rod moves along the axial direction of the valve body and is opposite to the valve clack; the valve clack and the transmission rod are arranged on two sides of the valve seat, and the valve clack is located on the side, close to the inlet flow channel, of the valve seat. The utility model discloses with both components of a whole that can function independently of valve clack and transfer line, set up in the both sides of disk seat, through the combination with reset spring, and then realize drive arrangement and valve clack linkage and open the valve, when the valve closed, drive arrangement and valve clack do not link, and the valve is closed under reset spring effect to the valve clack.

Description

Stop valve

Technical Field

The utility model relates to the technical field of valves, specifically stop valve.

Background

With the rapid development of hydrogen energy in China, the storage and transportation technology of hydrogen is continuously updated, and the problems of low transportation pressure (25 MPa), large mass of long-tube trailers used for storage, high transportation cost and the like are gradually highlighted because the existing storage and transportation technology of hydrogen still stays in the transportation mode of tube bundle vehicles. Therefore, the method of containerized hydrogen storage transportation by adopting the high-pressure wound gas cylinder also becomes a research and development direction, the pressure can reach 52MPa, and the low hydrogen storage density can be improved and the transportation cost can be reduced. For the convenience of control, the cylinder valve used in the working condition adopts a pneumatic driving mode and a manual driving mode, and meanwhile, a safety discharge function is achieved.

At present, most of stop valves at the bottle mouth of the high-pressure hydrogen cylinder are manually operated valves or are controlled by adopting modes such as an electromagnetic valve and the like, and the pneumatic valves are less in application. If a conventional high-pressure pneumatic valve structure (such as a high-pressure pneumatic stop valve disclosed in the publication number CN 203823205U) is adopted, the valve flap and the transmission device are respectively arranged on the same side of the valve seat, and meanwhile, because the valve flap and the piston are in linkage mode (namely, the valve flap is directly connected with the cylinder through the valve rod), the acting force for closing the valve flap needs to be provided by the cylinder, and the overall size of the valve is larger, so that the requirement of sealing force is met. The entire valve is also heavy and is not suitable for being mounted on the opening of the gas cylinder.

SUMMERY OF THE UTILITY MODEL

Problem to prior art exists, the utility model provides a stop valve to solve above at least one technical problem.

In order to achieve the purpose, the utility model provides a stop valve, which comprises a valve body, a valve seat, a valve clack and a driving mechanism for driving the valve clack to move, wherein the valve body is provided with an inlet flow passage and an outlet flow passage;

the driving mechanism comprises a transmission rod and a power source for driving the transmission rod to move longitudinally, and the transmission rod is in transmission connection with the power source;

the transmission rod is connected with the valve body in a sliding mode, the transmission rod is close to or far away from the valve clack under the action of the power source, and the transmission rod can penetrate through the valve seat and push the valve clack to be far away from the valve seat;

the valve clack and the transmission rod are arranged on two sides of the valve seat, and the valve clack is located on the side, close to the inlet flow channel, of the valve seat.

The utility model discloses with both components of a whole that can function independently of valve clack and transfer line, independently set up, and set up in the both sides of disk seat, through the combination with reset spring, and then realize that drive arrangement and valve clack linkage open the valve, when the valve closes, drive arrangement and valve clack do not link. In addition, in the closing state of the valve, the closing force borne by the valve clack only comes from the reset spring and the medium pressure, so that the additional acting force brought by the driving mechanism is reduced, and the damage of the valve clack to the valve seat when the valve clack is closed at high pressure is reduced. The inlet side of the valve body is the high pressure side. Which facilitates the supply of the closing medium pressure to the flap.

Further preferably, the drive mechanism comprises at least one of a pneumatic drive mechanism or a manual drive mechanism.

Further preferably, the driving mechanism comprises a pneumatic driving mechanism, the pneumatic driving mechanism comprises a cylinder, a piston and a piston rod, and the piston is connected with the piston rod;

the piston rod is connected with the transmission rod.

The up-and-down motion of the transmission rod is convenient to realize.

Further preferably, the piston rod axially penetrates the piston;

and the cylinder body is also provided with a manual driving mechanism, and the manual driving mechanism is used for propping against the piston rod and pushing the piston rod to move.

Further preferably, the piston will the inner chamber of cylinder body is separated for last cavity and lower cavity, install the drive gas interface on the last cavity, the cavity is equipped with the mouth of breathing down. And a spring which is used for propping against the cylinder body and the piston is arranged in the lower chamber.

Further preferably, the lower end of the valve clack is a spring limiting part, the spring limiting part comprises a cylindrical body used for sleeving the reset spring and a limiting ring used for abutting against the reset spring, and the limiting ring is connected to the cylindrical body.

Further preferably, the column body and the limit ring are in threaded connection, welded and fixed or integrally arranged.

Further preferably, the valve flap abuts against the valve seat to form a sealing structure.

Preferably, the valve body is provided with a limit groove for accommodating the return spring, and the limit groove is positioned right below the valve seat;

the limiting groove is communicated with the inlet flow passage.

The installation of being convenient for realize reset spring is in the valve body, the holistic volume of control valve.

Preferably, the valve body is provided with a safe discharge flow channel, the safe discharge flow channel is communicated with the limiting groove, and the valve body is provided with an exhaust valve butted with the safe discharge flow channel.

Preferably, the valve seat is provided with a through hole for the valve flap to move up and down, and the valve seat is provided with a sealing element;

the top of the valve clack is a sealing surface for propping against the sealing element, and the outer diameter of the sealing surface increases from top to bottom;

and a vertical tangent plane is arranged on the outer wall of the area of the valve clack below the sealing surface.

The sealing performance is ensured, meanwhile, the gap area between the valve clack and the through hole is increased, the flow passage sectional area (the gap area between the valve clack and the through hole) is enlarged as much as possible, and the circulation performance is improved.

Preferably, the bottom of the transmission rod extends into the valve body, and a cutting surface which is longitudinally arranged is arranged on the outer wall of the area of the transmission rod extending into the valve body.

Ensuring the circulation performance.

Drawings

Fig. 1 is a cross-sectional view of the present invention;

fig. 2 is a partial enlarged view of the valve seat of the present invention.

Wherein: the valve comprises a valve body 1, a valve clack spring 2, a valve clack 3, a valve seat 4, a transmission rod 5, a packing assembly 6, a valve cover 7, a cylinder spring 8, a piston rod 9, a piston 10, a driving air interface 11, a manual valve rod 12, a breathing port 13, a metal valve seat base body 4.1, an O-shaped ring assembly 4.2, a sealing element 4.3, a sealing element gland 4.4, a flow gap c', an inlet flow channel a, a safe discharge flow channel b, an outlet flow channel c, an exhaust valve d, a pneumatic driving mechanism e, an upper chamber f and a manual driving mechanism g.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 to 2, embodiment 1: the split stop valve with the transmission rod 5 and the valve clack 3 comprises a valve body 1, a valve cover 7, a valve seat 4, the valve clack 3 and a driving mechanism for driving the valve clack 3 to move. The valve body and the valve cover are combined to form a valve body. An inlet flow passage a and an outlet flow passage c are arranged on the valve body 1, and a return spring 2 is clamped between the valve clack 3 and the valve body 1. The function of the return spring is that when the valve clack is not in contact with the transmission rod, the valve clack is restored to the position in contact with the valve seat under the elastic action of the return spring, and a person skilled in the art can make reasonable adjustment on the specific structure and the connection mode of the return spring according to actual conditions. The return spring 2 is preferably located on the side of the flap 3 remote from the drive mechanism.

The driving mechanism comprises a transmission rod 5 and a power source for driving the transmission rod 5 to move longitudinally, and the transmission rod 5 is in transmission connection with the power source; the transmission rod 5 is connected with the valve cover 7 in a sliding mode and moves along the axial direction of the valve body. And the transmission rod is close to or far away from the valve clack under the action of the power source, can penetrate through the valve seat and pushes the valve clack to be far away from the valve seat. The valve cover 7 comprises an upper part and a lower part which are arranged up and down, a packing component 6 is clamped between the upper part and the lower part, and the packing component 6 is positioned between the transmission rod 5 and the valve cover 7. The packing assembly 6 achieves a sealing effect between the transmission rod 5 and the valve cover 7.

The transmission rod 5 is opposite to the valve clack 3; the valve flap 3 and the transmission rod 5 are arranged on both sides of the valve seat 4, and the valve flap 3 is located on the side of the valve seat 4 adjacent to the inlet channel a.

Specifically, the driving mechanism includes at least one of a pneumatic driving mechanism e or a manual driving mechanism g. Preferably, the drive mechanism includes a pneumatic drive mechanism e and a manual drive mechanism g. Specifically, the driving mechanism comprises a pneumatic driving mechanism e, the pneumatic driving mechanism e comprises a cylinder, a piston 10 and a piston rod 9, and the piston 10 is connected with the piston rod 9; the piston rod 9 is connected to the transmission rod 5. For the connection between the piston rod 9 and the transmission rod 5, the piston rod 9 and the transmission rod 5 may be connected through a coupler, or the piston rod 9 and the transmission rod 5 may be connected in an inserting manner, in a threaded manner, or detachably connected through a screw or the like, or the piston rod 9 and the transmission rod 5 may be the same rod body. The up-and-down movement of the transmission rod 5 is facilitated. The piston rod 9 axially penetrates through the piston 10 and is fixedly connected with the piston; and the cylinder body is also provided with a manual driving mechanism g, and the manual driving mechanism g is used for propping against the piston rod 9 and pushing the piston rod 9 to move. The manual driving mechanism comprises a manual valve rod 12 in threaded connection with the cylinder body, a handle positioned outside the cylinder body is installed at the top of the manual valve rod 12, and the bottom of the manual valve rod 12 is propped against the piston rod 9. The piston 10 divides the inner cavity of the cylinder body into an upper chamber f and a lower chamber, a driving air interface 11 is installed on the upper chamber f, and a breathing port 13 communicated with the atmosphere is installed in the lower chamber. And a cylinder spring 8 which is used for propping against the cylinder body and the piston 10 is arranged in the lower chamber.

The lower extreme of valve clack 3 is the spacing portion of spring, and the spacing portion of spring is including being used for entangling reset spring 2's the cylindricality body and being used for supporting reset spring 2's spacing ring, and the spacing ring is fixed on the cylindricality body. The valve clack 3 is propped against the valve seat 4 to form a sealing structure. A limiting groove for accommodating the reset spring 2 is formed in the valve body 1 and is positioned right below the valve seat 4; the limiting groove is communicated with the inlet flow passage a. The reset spring 2 is convenient to install in the valve body 1 to control the whole volume of the valve.

The valve body 1 is provided with a safe discharge flow passage b, the safe discharge flow passage b is communicated with the limiting groove, and the valve body 1 is provided with an exhaust valve d butted with the safe discharge flow passage.

A through hole for the valve clack 3 to move up and down is formed in the valve seat 4, and a sealing element 4.3 is installed on the valve seat 4; the top of the valve clack 3 is a sealing surface for propping against a sealing element 4.3, and the outer diameter of the sealing surface is gradually increased from top to bottom. The seal 4.3 may be a non-metallic sealing material. The valve seat 4 comprises a metal valve seat base body 4.1, a sealing element 4.3 and a sealing element gland 4.4, wherein the sealing element 4.3 is clamped and fixed with the metal valve seat base body 4.1 through the sealing element gland 4.4. The sealing part gland 4.4 and the metal valve seat base body 4.1 are both provided with through holes which are butted up and down. The through hole is used for communicating the inlet flow passage a and the outlet flow passage c. When the transmission rod 5 pushes the valve clack 3, the transmission rod penetrates through the through hole to prop against the valve clack 3, so that the valve clack 3 and the sealing element 4.3 are separated relatively, and a flow guide gap for butting the inlet flow passage a and the outlet flow passage c is formed. An O-shaped ring component 4.2 is arranged on the outer wall of the metal valve seat base body 4.1, and the O-shaped ring component 4.2 is clamped between the metal valve seat base body 4.1 and the valve body 1. The metal valve seat base body 4.1 is detachably mounted in the valve body 1.

The valve clack 3 is provided with a vertical tangent plane on the outer wall of the area below the sealing surface. The sealing performance is ensured, meanwhile, the gap area between the valve clack 3 and the through hole is increased, the flow passage sectional area (the gap area between the valve clack 3 and the through hole) is enlarged as much as possible, and the circulation performance is improved.

The bottom of the transmission rod 5 extends into the valve body 1, and the outer wall of the area of the transmission rod 5 extending into the valve body 1 is provided with a longitudinally arranged tangent plane. The size of the outflow clearance c' (namely the clearance between the transmission rod 5 and the inner hole of the sealing gland 4.4) is enlarged, and the flow performance is ensured.

The working principle is as follows: the driving gas enters the upper chamber from the driving gas interface 11, pushes the piston 10 and the piston rod 9 to move downwards, pushes the valve clack 3 away from the valve seat 4, and communicates the inlet flow passage a with the outlet flow passage c, so that the opening action of the valve is realized. Otherwise, the driving gas pressure disappears, the cylinder spring 8 moves upwards under the upward thrust of the piston rod 9, meanwhile, the valve clack 3 also moves upwards under the thrust of the return spring 2, the valve clack 3 and the valve seat 4 are closed, the inlet flow channel a is disconnected with the outlet flow channel c, and the closing action of the valve is realized.

Specifically, when the valve is not driven, the valve is in a normally closed state, the cylinder spring 8 pushes the piston rod 9 upwards to move upwards to a limit position, the transmission rod 5 is separated from the valve clack 3, meanwhile, the valve clack 3 is tightly attached to the valve seat 4 under the action of the return spring 2, the inlet flow channel a is disconnected from the outlet flow channel c, and the valve is in a normally closed state. The sealing state of the valve is realized under different pressures by the combined acting force of medium back pressure at the positions of the return spring 2 and the valve clack 3.

When the gas is driven, it enters the upper chamber from the drive gas port 11, pushing the piston 10 downward under drive gas pressure. At this time, the driving gas needs to overcome the upward thrust of the spring of the piston 10, the thrust of the medium pressure of the outlet flow channel c to the piston 10, the thrust of the return spring 2, the thrust of the valve clack 3 due to pressure difference and the friction force generated at the packing position. The piston 10 is in threaded connection with the piston rod 9 and pushes the valve clack 3 away from the valve seat 4, and the valve is opened. When the driving gas pressure disappears, the upward thrust of the spring of the piston 10, the thrust of the medium pressure of the outlet flow channel c to the piston 10, the thrust of the valve clack 3 and the like push the piston 10 and the piston rod 9 to move upwards, and when the valve clack 3 is attached to the valve seat 4, the valve realizes the closing action.

Has the advantages that:

1) The valve clack 3 is arranged on the side of the pressure source, namely adjacent to the inlet channel a, sealing is carried out by the return spring 2 and medium pressure during sealing, and the sealing force provided by the pneumatic driving mechanism and the acting force during high-pressure sealing of the valve seat 4 are reduced.

2) When the pneumatic driving mechanism does not need to provide sealing force for the valve clack 3, the diameter of a cylinder body of the pneumatic driving mechanism is relatively small, and the whole weight is relatively light.

3) Because when sealing, valve clack 3 is through the sealed of 2 and medium pressure realizations of reset spring, and valve clack 3 and valve rod are in the separation state, consequently when high pressure, the sealing effort that valve seat 4 received is little, and non-metallic seal material can be adopted to the sealing member 4.3 of valve seat 4, improves sealed effect, reduces sealing member 4.3 and damages the speed, improves valve life.

4) The valve is opened by the transmission rod 5 acting on the valve clack 3, so that the force in the opposite direction borne by the transmission rod 5 is the sum of the pressure of the medium and the spring pressure of the valve clack 3, the resultant force value is small, the sealing diameter of the packing part of the transmission rod 5 is also designed to be small, and the thrust of the medium to the transmission rod 5 under the pressurizing working condition is reduced. Finally, the diameter of the cylinder is reduced, and the purpose of designing the precise word is achieved.

5) The periphery of the valve clack 3 is provided with a tangent plane, so that a flow channel which has a guide excircle and an enough area is formed, and the sealing performance and the circulation performance of the valve are ensured.

6) The periphery of the transmission rod 5 is provided with a tangent plane which forms a guide and circulation channel with the hole wall on the sealing part gland 4.4, so that the sealing performance and the circulation performance of the valve are ensured.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The stop valve comprises a valve body, a valve seat, a valve clack and a driving mechanism for driving the valve clack to move, wherein an inlet flow passage and an outlet flow passage are arranged on the valve body;

2. The shut-off valve of claim 1, wherein: the drive mechanism includes at least one of a pneumatic drive mechanism or a manual drive mechanism.

3. The shut-off valve of claim 1, wherein: the driving mechanism comprises a pneumatic driving mechanism, the pneumatic driving mechanism comprises a cylinder body, a piston and a piston rod, and the piston is connected with the piston rod;

the piston rod is connected with the transmission rod.

4. A shut-off valve as claimed in claim 3, wherein: the piston rod axially penetrates through the piston and is fixed;

and the cylinder body is also provided with a manual driving mechanism, and the manual driving mechanism is used for pushing the piston rod to move.

5. The shut-off valve of claim 1, wherein: the lower extreme of valve clack is the spacing portion of spring, the spacing portion of spring is including the cylindricality body that is used for entangling reset spring and the spacing ring that is used for supporting reset spring, the spacing ring is connected on the cylindricality body.

6. The shut-off valve of claim 5, wherein: the cylindrical body is in threaded connection with the limiting ring, and is welded and fixed or is integrally arranged.

7. The shut-off valve of claim 1, wherein: the valve body is provided with a limit groove for accommodating the reset spring, and the limit groove is positioned right below the valve seat;

the limiting groove is communicated with the inlet flow passage.

8. The shut-off valve of claim 7, wherein: the valve body is provided with a safe discharge flow channel, the safe discharge flow channel is communicated with the limiting groove, and the valve body is provided with an exhaust valve butted with the safe discharge flow channel.

9. A stop valve as claimed in any one of claims 1 to 8, wherein: the valve seat is provided with a through hole for the valve clack to move up and down, and a sealing element is arranged on the valve seat;

10. A stop valve as claimed in any one of claims 1 to 8, wherein: the bottom of the transmission rod extends into the valve body, and the transmission rod extends into the outer wall of the area in the valve body, and a cutting surface which is longitudinally arranged is arranged on the outer wall.