CN216519815U

CN216519815U - Self-operated balance valve of 1200MW sealing oil system

Info

Publication number: CN216519815U
Application number: CN202123290310.6U
Authority: CN
Inventors: 章泉栋; 褚孝荣; 涂德鹏; 施宇期; 吴彩霞; 丁佳鹏; 赵显国; 胡逸轩; 陈立民
Original assignee: ZHEJIANG SANFANG CONTROL VALVE CO Ltd; China Nuclear Power Engineering Co Ltd
Current assignee: ZHEJIANG SANFANG CONTROL VALVE CO Ltd; China Nuclear Power Engineering Co Ltd
Priority date: 2021-12-25
Filing date: 2021-12-25
Publication date: 2022-05-13
Anticipated expiration: 2031-12-25

Abstract

The utility model relates to the field of valves, in particular to a self-operated balance valve of a 1200MW sealing oil system, which comprises a valve body and a blank cap arranged at the top of the valve body; the valve core assembly is movably arranged on the valve rod and is matched with the valve seat; the valve seats comprise an upper valve seat and a lower valve seat which have the same size and are used for balancing pressure; the valve core assembly comprises a lower valve core and an upper valve core, wherein the lower valve core is movably connected with the valve rod and is matched with the lower valve seat, and the upper valve core is arranged on the lower valve core and is matched with the upper valve seat; according to the utility model, the valve core assembly is movably arranged on the valve rod, so that the center position of the worn valve core assembly is always coaxial with the valve rod, and the adjusting precision of the balance valve is improved.

Description

Self-operated balance valve of 1200MW sealing oil system

Technical Field

The utility model relates to the field of valves, in particular to a self-operated balance valve of a 1200MW sealing oil system.

Background

The self-operated balance valve is an essential key device in a double-flow sealed oil system of the hydrogen-cooled generator. The valve core stress condition of the self-operated balance valve in the prior art is greatly influenced by pressure change and flow change before and after the valve, the valve core and a valve seat have different abrasion degrees in the motion process of the balance valve, accumulated errors cause that the valve core and a valve rod are not coaxial, and the friction force of an actuating mechanism is large when the balance valve is adjusted, so that the problem of low adjustment precision of the self-operated balance valve is caused by the reasons. Therefore, the utility model provides a self-operated balance valve of a 1200MW sealing oil system.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem of low adjustment precision of a self-operated balance valve caused by various reasons.

In order to achieve the purpose, the utility model provides a self-operated balance valve of a 1200MW sealing oil system, which comprises a valve body and a blank cap arranged at the top of the valve body; the valve core assembly is movably arranged on the valve rod and is matched with the valve seat; the valve seats comprise an upper valve seat and a lower valve seat which have the same size and are used for balancing pressure; the valve core assembly comprises a lower valve core and an upper valve core, wherein the lower valve core is movably connected with the valve rod and is matched with the lower valve seat, and the upper valve core is arranged on the lower valve core and is matched with the upper valve seat.

Further preferably, waist moon-shaped diversion grooves for stabilizing pressure values are formed in the lower valve core and the upper valve core.

Preferably, the adjusting mechanism comprises an oil cylinder cover connected with the actuating mechanism, an adjusting rod arranged on the oil cylinder cover and used for adjusting the valve core assembly, a lower spring seat arranged on the adjusting rod, an adjusting spring arranged on the lower spring seat and a locking nut arranged on the adjusting rod and connected with the oil cylinder cover; the adjusting spring is connected with the actuating mechanism.

Preferably, the actuating mechanism comprises an oil cylinder arranged at the bottom of the valve body and connected with an oil cylinder cover, an upper spring seat arranged at the top of the adjusting spring and a piston arranged on the upper spring seat; and a compensation spring connected with the valve rod and used for transmitting force is arranged in the upper spring seat.

Further preferably, the piston is provided with a spiral diversion trench for improving the adjustment precision; the oil cylinder is also provided with an empty side interface and a hydrogen side interface.

Further preferably, the valve rod is provided with a cylindrical pin which is movably connected with the valve core assembly.

Further preferably, the cylinder cover is further provided with a protective cover for protecting the adjusting rod.

The utility model has the beneficial effects that: the original valve seats are arranged into the upper valve seat and the lower valve seat which have the same size, so that hydraulic oil generates upward force on the upper valve seat and the upper valve core in the valve body and generates downward force on the lower valve seat and the lower valve core, and the upward force and the downward force are mutually offset due to the same size, so that the stress condition of the valve core assembly is not influenced by the pressure change of the front and the back of the valve, the force applied to the valve core assembly can not be offset when the balance valve is adjusted, the response speed of the valve core assembly is accelerated, and the control precision of the balance valve is improved;

the arrangement of the spiral diversion trench reduces the contact area between the piston and the oil cylinder, thereby reducing the friction force between the piston and the oil cylinder, enabling the hydraulic oil in the upper cavity and the lower cavity of the piston to be circulated, avoiding the occurrence of a pressure build-up condition, enabling the piston to rapidly move when the balance valve is adjusted, improving the sensitivity, sealing the hydraulic oil through the gap between the upper cavity and the lower cavity, and ensuring the function of an actuating mechanism to be implemented;

through the setting with case subassembly movable mounting on the valve rod, the case subassembly central point after making wearing and tearing takes place all the time coaxial with the valve rod, when guaranteeing the adjustment balanced valve, and the case subassembly moves smoothly, does not have the card and hinders to improve the adjustment accuracy of balanced valve.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of the valve core assembly of the present invention;

FIG. 3 is a schematic view of the valve stem and valve cartridge assembly of the present invention;

fig. 4 is a schematic view of the piston structure of the present invention.

The labels in the figure are: the hydraulic control valve comprises a valve body 1, a medium inlet 11, a medium outlet 12, a blank cap 2, a valve seat 3, an upper valve seat 31, a lower valve seat 32, an actuating mechanism 4, an oil cylinder 41, an upper spring seat 42, a piston 43, an empty side interface 431, a hydrogen side interface 432, a compensation spring 44, a spiral guide groove 45, an adjusting mechanism 5, an oil cylinder cover 51, an adjusting rod 52, a lower spring seat 53, an adjusting spring 54, a protective cover 55, a valve rod 6, a valve core assembly 7, a lower valve core 71, an upper valve core 72, a waist moon-shaped guide groove 73 and a cylindrical pin 8.

Detailed Description

The self-operated balance valve of the 1200MW sealing oil system of the utility model is further described by the following embodiments and the accompanying drawings.

Referring to the attached drawings 1-3, the self-operated balance valve of the 1200MW sealing oil system comprises a valve body 1 and a blank cap 2 arranged on the top of the valve body 1 through bolts; the valve core assembly is characterized by further comprising a valve seat 3 installed in the valve body 1 through threaded connection, an actuating mechanism 4 installed at the bottom of the valve body 1, an adjusting mechanism 5 and a valve rod 6 installed on the actuating mechanism 4, and a valve core assembly 7 movably installed on the valve rod 6 through threaded connection and matched with the valve seat 3; the valve seat 3 comprises an upper valve seat 31 and a lower valve seat 32 which are the same in size and used for balancing pressure; the valve core assembly 7 comprises a lower valve core 71 which is movably connected with the valve rod 6 through threads and is matched with the lower valve seat 32, and an upper valve core 72 which is arranged on the lower valve core 71 and is matched with the upper valve seat 31; the thread movable connection is the clearance fit between the internal thread of the lower valve core 71 and the external thread of the valve rod 6, so that the lower valve core 71 can be movably connected on the valve rod 6 in a rotating way; the lower valve core 71 and the upper valve core 72 are integrally processed and formed; according to the utility model, the valve seat 3 is provided with the upper valve seat 31 and the lower valve seat 32 which are the same in size, so that the hydraulic oil 42 generates an upward force on the upper valve seat 31 and the upper valve core 72 and a downward force on the lower valve seat 32 and the lower valve core 71 in the valve body 1, the upper valve seat 31 and the lower valve seat 32 are the same in size, and the upper valve core 72 and the lower valve core 71 are the same in size, so that the forces on the upper valve core 71 and the lower valve core 71 are opposite in magnitude and opposite in direction and mutually offset, therefore, the stress condition of the valve core assembly 7 is not influenced by the pressure change in the front and back of the valve, when the force for adjusting the balance valve is applied to the valve core assembly 7, the corresponding speed of the valve core assembly 7 is improved, and the control accuracy of the balance valve is improved.

Referring to fig. 1-3, waist moon-shaped diversion grooves 73 for stabilizing pressure values are formed in the lower valve core 71 and the upper valve core 72; according to the utility model, through the arrangement of the waist-moon-shaped diversion trench 73, the opening degree of the balance valve and the change of the flow rate are in a linear relation, so that when the balance valve is adjusted, the flow rate of hydraulic oil is uniformly changed and cannot be suddenly changed, and the change of the pressure value controlled by the balance valve is more stable and easier to adjust.

Referring to fig. 1-3, the adjusting mechanism 5 of the present invention includes a cylinder head 51 connected to the actuator 4 by a screw, an adjusting rod 52 mounted on the cylinder head 51 by a screw for adjusting the valve core assembly 7, a lower spring seat 53 mounted on the adjusting rod 52 by a screw, an adjusting spring 54 mounted on the lower spring seat 53, and a lock nut 56 mounted on the adjusting rod 52 and connected to the cylinder head 51; the adjusting spring 54 is connected with the actuating mechanism 4; according to the utility model, through the arrangement of the adjusting rod 52 and the locking nut 56, the position of the adjusting rod 52 can be adjusted, so that the position of the lower spring seat 53 is adjusted, the compression degree of the adjusting spring 54 is adjusted, and the differential pressure value of the upper chamber and the lower chamber is adjusted when the piston is balanced.

Referring to fig. 1-3, the actuator 4 of the present invention comprises an oil cylinder 41 mounted at the bottom of the valve body 1 and bolted to an oil cylinder head 51, an upper spring seat 42 mounted at the top of an adjusting spring 54, and a piston 43 mounted on the upper spring seat 42 by a threaded connection; a compensating spring 44 connected with the valve rod 6 and used for transmitting force is arranged in the upper spring seat 42; according to the utility model, the piston 43 and the valve rod 6 are separated through the arrangement of the compensation spring 44, when the piston 43 moves upwards, the compensation spring 44 is compressed by being matched with the valve rod 6, the compensation spring 44 generates an upward force on the valve rod 6 to push the valve rod 6 to move, so that the axis position of the valve rod 6 is adjusted to ensure the coaxiality of the valve rod 6 and the piston 43, the moving distance of the piston 43 is equal to the moving distance of the valve rod 6, the adjustment precision is improved, and the processing difficulty of the piston 43 and the valve rod 6 is reduced.

Referring to fig. 1-4, the piston 43 of the present invention is provided with a spiral guiding groove 45 for improving the adjustment accuracy; the oil cylinder 41 is also provided with an empty side interface 431 and a hydrogen side interface 432; the valve rod 6 is provided with a cylindrical pin 8 which is movably connected with the valve core assembly 7; the cylinder cover 51 is also provided with a protective cover 55 for protecting the adjusting rod 52; according to the utility model, through the arrangement of the spiral guide groove 45, the contact area between the piston 43 and the oil cylinder 41 is reduced, so that the friction force between the piston 43 and the oil cylinder 41 is reduced, the sensitivity of the piston 43 is improved, and the adjusting precision is improved, meanwhile, the spiral guide groove 45 is filled with hydraulic oil to seal the upper cavity and the lower cavity of the piston, when the adjustment is too fast, the hydraulic oil can flow to another cavity through the spiral guide groove 45, so that the pressure holding cannot be influenced, the adjusting sensitivity is improved, and the adjusting precision of the balance valve is improved; through the arrangement of the cylindrical pin 8 and the arrangement of movably mounting the valve core assembly 7 on the valve rod 6, the center position of the abraded valve core assembly 7 is always coaxial with the valve rod 6, and the moving distance of the valve rod 6 is the same as that of the valve core assembly 7 when the balance valve is adjusted, so that the adjusting precision of the balance valve is improved; through the setting of safety cover 55, protect adjusting lever 52, avoid adjusting lever 52 by the collision damage and adjusting lever 52 by mistake touching, lead to carrying out the mistake adjustment to the balanced valve.

Referring to fig. 1-4, the working process of the present invention is that when the space-time side interface 431 is used to introduce hydraulic oil, so that when the pressure of the lower chamber of the piston 7 is increased, an upward force is applied to the piston 43, the piston 43 presses the compensation spring 44, the compensation spring 44 applies an upward force to the valve rod 6, the valve rod 6 pushes the valve core assembly 7 to move upward, so that the opening of the balance valve is increased, so that more media enter the medium outlet 12 from the medium inlet 11 through the waist-moon-shaped diversion groove 73 and then enter the upper chamber of the piston 43 through the connecting pipeline, the pressure of the upper chamber of the piston 43 is increased, the downward thrust generated by the pressure in the upper chamber of the piston 43 and the self-gravity of the valve rod 6, the valve core assembly 7 and the piston 43 are equal to the upward thrust generated by the pressure of the lower chamber of the piston 43 and the acting force of the adjustment spring 54, at this time, the piston 43 does not move any more, and the valve core assembly 7 does not move, the purpose of balancing the two oil pressures is achieved.

The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims

A self-operated balance valve of a 1.1200MW sealing oil system comprises a valve body (1) and a blank cap (2) arranged at the top of the valve body (1); the valve core assembly is characterized by further comprising a valve seat (3) arranged in the valve body (1), an actuating mechanism (4) arranged at the bottom of the valve body (1), an adjusting mechanism (5) and a valve rod (6) arranged on the actuating mechanism (4), and a valve core assembly (7) movably arranged on the valve rod (6) and matched with the valve seat (3); the valve seat (3) comprises an upper valve seat (31) and a lower valve seat (32) which have the same size and are used for balancing pressure; the valve core assembly (7) comprises a lower valve core (71) which is movably connected with the valve rod (6) and is matched with the lower valve seat (32), and an upper valve core (72) which is arranged on the lower valve core (71) and is matched with the upper valve seat (31).
2. The 1200MW seal oil system self-operated balancing valve of claim 1, characterized in that: waist moon-shaped diversion grooves (73) for stabilizing pressure values are formed in the lower valve core (71) and the upper valve core (72).
3. The 1200MW seal oil system self-operated balancing valve of claim 1, characterized in that: the adjusting mechanism (5) comprises an oil cylinder cover (51) connected with the executing mechanism (4), an adjusting rod (52) arranged on the oil cylinder cover (51) and used for adjusting the valve core assembly (7), a lower spring seat (53) arranged on the adjusting rod (52), an adjusting spring (54) arranged on the lower spring seat (53) and a locking nut (56) arranged on the adjusting rod (52) and connected with the oil cylinder cover (51); the adjusting spring (54) is connected with the actuating mechanism (4).
4. The 1200MW sealing oil system self-operated balancing valve of claim 1 or 3, characterized in that: the actuating mechanism (4) comprises an oil cylinder (41) which is arranged at the bottom of the valve body (1) and connected with an oil cylinder cover (51), an upper spring seat (42) which is arranged at the top of the adjusting spring (54) and a piston (43) which is arranged on the upper spring seat (42); and a compensating spring (44) which is connected with the valve rod (6) and used for transmitting force is arranged in the upper spring seat (42).
5. The 1200MW sealing oil system self-operated balancing valve of claim 4, characterized in that: a spiral diversion trench (45) for improving the adjustment precision is arranged on the piston (43); the oil cylinder (41) is further provided with an empty side interface (431) and a hydrogen side interface (432).
6. The 1200MW seal oil system self-operated balancing valve of claim 1, characterized in that: and the valve rod (6) is provided with a cylindrical pin (8) movably connected with the valve core assembly (7).
7. The 1200MW sealing oil system self-operated balancing valve of claim 3, characterized in that: and the oil cylinder cover (51) is also provided with a protective cover (55) for protecting the adjusting rod (52).